/* ========================================
   KERN 官网样式表 - 白色主题
======================================== */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #F5F7FA;
    --bg-card: #ffffff;
    --bg-elevated: #F8FAFC;
    --bg-dark: #1F2937;

    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --text-light: #ffffff;

    --accent-primary: #0066FF;
    --accent-secondary: #0052CC;
    --accent-light: #E6F0FF;

    --border-color: #E5E7EB;
    --border-light: #F3F4F6;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;

    --font-family: 'Source Han Sans SC', 'Source Han Sans CN', '思源黑体', sans-serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
}

section.interactive-section {
    transition: transform 0.45s ease, opacity 0.45s ease, filter 0.45s ease;
    transform: translateY(18px);
    opacity: 0.82;
    filter: saturate(0.95);
}

section.interactive-section.module-in-view {
    transform: translateY(0);
    opacity: 1;
    filter: saturate(1);
}

.module-spotlight {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 1100;
    width: 260px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid #dce5f3;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
    backdrop-filter: blur(8px);
    padding: 12px 14px;
    opacity: 0;
    transform: translateY(14px);
    transition: all 0.3s ease;
    pointer-events: none;
}

.module-spotlight.active {
    opacity: 1;
    transform: translateY(0);
}

.spotlight-label {
    display: inline-block;
    font-size: 11px;
    color: #6b7b95;
    margin-bottom: 4px;
}

.spotlight-title {
    display: block;
    font-size: 17px;
    line-height: 1.3;
    color: #1f2a3d;
}

.spotlight-desc {
    margin-top: 4px;
    font-size: 12px;
    color: #73839d;
}

.qrcode-modal {
    position: fixed;
    inset: 0;
    z-index: 1300;
    display: none;
}

.qrcode-modal.active {
    display: block;
}

.qrcode-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
}

.qrcode-modal-content {
    position: relative;
    width: min(360px, calc(100vw - 32px));
    margin: 12vh auto 0;
    background: #fff;
    border-radius: 14px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
    z-index: 1;
}

.qrcode-modal-close {
    position: absolute;
    right: 10px;
    top: 10px;
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 50%;
    background: #eef3fb;
    color: #5f7295;
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
}

.qrcode-modal-content h3 {
    font-size: 22px;
    margin-bottom: 8px;
    color: #1f2a3d;
}

.qrcode-modal-content p {
    font-size: 14px;
    color: #657896;
    margin-bottom: 14px;
}

.qrcode-modal-image {
    width: 220px;
    height: 220px;
    object-fit: contain;
    border: 1px solid #e2e9f5;
    border-radius: 10px;
    background: #fff;
}

.customer-service-float {
    position: static;
    border: 1px solid #d8e3f5;
    background: rgba(255, 255, 255, 0.96);
    border-radius: 12px;
    box-shadow: 0 12px 26px rgba(15, 23, 42, 0.14);
    padding: 8px;
    width: 120px;
    cursor: pointer;
}

.footer-customer-service-col {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-customer-service-col h4 {
    margin-bottom: 12px;
}

.customer-service-thumb {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid #e3e9f5;
    background: #fff;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   导航栏
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition-normal);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    width: 100%;
    max-width: none;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.site-logo-img {
    width: auto;
    height: 32px;
    max-height: 32px;
    object-fit: contain;
    border-radius: 4px;
    background: transparent;
}

.footer-logo-white {
    filter: brightness(0) invert(1);
    background: transparent;
}

.navbar .logo .site-logo-img {
    height: 28px;
    max-height: 28px;
}

.footer-logo-white-svg {
    color: #ffffff;
}

.navbar .logo svg {
    width: auto;
    height: 1em;
    max-height: 1em;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-links a:hover {
    color: var(--accent-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-login {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.btn-login:hover {
    color: var(--accent-primary);
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.btn-primary:hover {
    background: var(--accent-secondary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-menu a {
    display: block;
    padding: 12px 0;
    color: var(--text-secondary);
}

/* ========================================
   Hero区域
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 150%;
    background: radial-gradient(ellipse at center, rgba(0, 102, 255, 0.08) 0%, transparent 60%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-light);
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 32px;
}

.hero-title {
    font-size: clamp(40px, 7vw, 72px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.hero-title .line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary) 0%, #0052CC 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-primary);
    color: white;
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition-normal);
    box-shadow: 0 4px 14px rgba(0, 102, 255, 0.3);
}

.btn-hero-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 16px 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition-normal);
}

.btn-hero-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); opacity: 1; }
    50% { transform: rotate(45deg) translateY(10px); opacity: 0.5; }
}

/* ========================================
   产品展示
======================================== */
.products {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.architecture-desc-nowrap {
    white-space: nowrap;
    max-width: none;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.product-card {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.product-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.product-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.product-info {
    flex: 1;
}

.product-name {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.coming-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 100px;
}

.product-desc {
    font-size: 15px;
    color: var(--text-secondary);
}

.product-arrow {
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.product-card:hover .product-arrow {
    color: var(--accent-primary);
    transform: translateX(4px);
}

/* ========================================
   核心优势
======================================== */
.advantages {
    padding: 120px 0;
    background: var(--bg-primary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.advantage-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.advantage-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.advantage-card:hover {
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
    margin: 0 auto 24px;
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   AI工作变革
======================================== */
.ai-transformation {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.ai-transformation-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.ai-transform-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.ai-transform-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.ai-transform-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
}

.ai-transform-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.ai-transform-card p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.ai-transform-card ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-transform-card li {
    font-size: 14px;
    color: var(--text-secondary);
    padding-left: 18px;
    position: relative;
}

.ai-transform-card li::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-primary);
    position: absolute;
    left: 0;
    top: 10px;
}

/* ========================================
   客户案例
======================================== */
.cases {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.case-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
}

.case-logo {
    margin-bottom: 24px;
}

.logo-placeholder {
    width: 48px;
    height: 48px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.case-quote {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    font-style: italic;
}

.case-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.author-name {
    font-size: 15px;
    font-weight: 600;
}

.author-title {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========================================
   CTA区域
======================================== */
.cta {
    padding: 120px 0;
    background: var(--bg-primary);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-cta-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-primary);
    color: white;
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition-normal);
    box-shadow: 0 4px 14px rgba(0, 102, 255, 0.3);
}

.btn-cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.btn-cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 16px 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition-normal);
}

.btn-cta-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ========================================
   页脚
======================================== */
.footer {
    padding: 80px 0 40px;
    background: var(--bg-dark);
    color: var(--text-light);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(5, 1fr);
    gap: 48px;
    margin-bottom: 64px;
}

.footer-brand .logo {
    color: var(--text-light);
    margin-bottom: 16px;
}

.footer-tagline {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-light);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

.copyright-info {
    margin-top: 8px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}

/* ========================================
   产品详情页 Hero
======================================== */
.product-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.product-hero .hero-bg {
    position: absolute;
    inset: 0;
}

.product-hero .hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 150%;
}

.product-hero .hero-content {
    flex: 1;
    max-width: 600px;
    text-align: left;
    padding: 0 48px;
}

.product-hero .hero-title {
    font-size: clamp(36px, 5vw, 56px);
}

.product-hero .hero-actions {
    justify-content: flex-start;
}

.product-demo {
    flex: 1;
    padding: 0 48px;
}

.demo-window {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.demo-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.demo-dots {
    display: flex;
    gap: 8px;
}

.demo-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border-color);
}

.demo-dots span:first-child {
    background: #ef4444;
}

.demo-dots span:nth-child(2) {
    background: #eab308;
}

.demo-dots span:nth-child(3) {
    background: #22c55e;
}

.demo-title {
    font-size: 13px;
    color: var(--text-muted);
}

.demo-content {
    padding: 24px;
}

.demo-query {
    margin-bottom: 24px;
}

.query-input {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--accent-light);
    border-radius: var(--radius-md);
}

.query-icon {
    color: var(--accent-primary);
}

.query-text {
    font-size: 15px;
    color: var(--text-secondary);
}

.demo-result {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 20px;
}

.result-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

.result-chart {
    display: flex;
    align-items: flex-end;
    gap: 16px;
    height: 100px;
    margin-bottom: 16px;
}

.chart-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--accent-primary) 0%, var(--accent-light) 100%);
    border-radius: 4px 4px 0 0;
}

.result-dashboard {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
    align-items: stretch;
}

.dashboard-metrics {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.metric-chip {
    border: 1px solid #dfe8f6;
    border-radius: 8px;
    background: #f8fbff;
    padding: 7px 9px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.metric-chip span {
    font-size: 12px;
    color: #6b7f9f;
}

.metric-chip b {
    font-size: 12px;
    color: #1f3f8c;
}

.dashboard-donut {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    border: 1px solid #dfe8f6;
    border-radius: 10px;
    background: linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
    min-height: 124px;
    padding: 10px 14px;
}

.donut-ring {
    width: 108px;
    height: 108px;
    border-radius: 50%;
    background: conic-gradient(#2f74ff 0 68%, #dce8fb 68% 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.donut-center {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: #fff;
    font-size: 19px;
    font-weight: 700;
    color: #2f74ff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dashboard-donut span {
    font-size: 14px;
    font-weight: 600;
    color: #6b7f9f;
}

.result-insight {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
}

.result-insight svg {
    color: #F59E0B;
    flex-shrink: 0;
}

/* ========================================
   功能区块
======================================== */
.features {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.feature-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   为什么选择 KERN 智能问数
======================================== */
.why-kern {
    padding: 124px 0;
    background: var(--bg-secondary);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}

.why-card {
    background: #ffffff;
    border: 1px solid #e6ebf5;
    border-radius: 14px;
    padding: 20px 18px;
    min-height: 280px;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.05);
    opacity: 0;
    transform: translateY(18px);
    transition: var(--transition-normal);
}

.why-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.why-card:hover {
    border-color: #cfe0fb;
    box-shadow: 0 12px 26px rgba(15, 23, 42, 0.08);
}

.why-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #ffffff;
    background: linear-gradient(135deg, #4f7cff 0%, #3a63d9 100%);
    margin-bottom: 14px;
}

.why-card h3 {
    font-size: 28px;
    line-height: 1.15;
    margin-bottom: 12px;
    color: #0f2348;
}

.why-card p {
    font-size: 14px;
    color: #4f6282;
    line-height: 1.7;
    margin-bottom: 14px;
}

.why-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.why-tags span {
    padding: 4px 9px;
    font-size: 11px;
    border-radius: 999px;
    color: #5872a0;
    background: #eef3fb;
    border: 1px solid #dde7f7;
}

.why-input {
    font-size: 13px;
    color: #50617d;
    border: 1px solid #dde6f3;
    border-radius: 6px;
    background: #fafcff;
    padding: 7px 9px;
}

.why-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.why-list li {
    font-size: 13px;
    color: #4f6282;
    padding-left: 14px;
    position: relative;
}

.why-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #4f7cff;
}

/* ========================================
   赋能板块（AI问数）
======================================== */
.empowerment {
    padding: 148px 0;
    background: var(--bg-primary);
}

.security-control {
    padding: 148px 0;
    background: var(--bg-secondary);
}

.easy-build {
    padding: 148px 0;
    background: var(--bg-primary);
}

.easy-build .section-header {
    margin-bottom: 56px;
}

.privacy-banner {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: 22px;
    padding: 12px 20px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(47, 116, 255, 0.08) 0%, rgba(17, 182, 216, 0.1) 100%);
    border: 1px solid rgba(47, 116, 255, 0.18);
    color: #2f5ea8;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
}

.privacy-banner svg {
    flex-shrink: 0;
    color: #2f74ff;
}

.scenario-icon.teal {
    background: linear-gradient(135deg, #11b6d8 0%, #0b8aa9 100%);
}

.scenario-icon.green {
    background: linear-gradient(135deg, #2bd673 0%, #15b258 100%);
}

.screenshot-shot {
    background: #ffffff;
    border: 1px solid #e6eaf2;
    border-radius: 14px;
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
    overflow: hidden;
    min-height: 320px;
}

.screenshot-shot img {
    display: block;
    width: 100%;
    height: auto;
    border: none;
    border-radius: 0;
    object-fit: contain;
    vertical-align: top;
}

.scenario-row.reverse .screenshot-shot {
    order: 1;
}

.easy-build .scenario-row-compact {
    align-items: stretch;
}

.easy-build .scenario-row-compact .scenario-info-card {
    min-height: 320px;
    height: 100%;
}

.easy-build .scenario-row-compact .screenshot-shot {
    position: relative;
    min-height: 320px;
    height: 100%;
    display: block;
}

.easy-build .scenario-row-compact .screenshot-shot img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: calc(100% - 24px);
    max-height: calc(100% - 24px);
    width: auto;
    height: auto;
    object-fit: contain;
    object-position: center;
}

.empowerment-list {
    display: flex;
    flex-direction: column;
    gap: 44px;
}

.scenario-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.scenario-row.revealed {
    opacity: 1;
    transform: translateY(0);
}

.scenario-row.reverse .scenario-info-card {
    order: 2;
}

.scenario-row.reverse .chat-shot {
    order: 1;
}

.scenario-info-card {
    background: #ffffff;
    border: 1px solid #e8edf5;
    border-radius: 14px;
    padding: 28px 28px 24px;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.05);
    min-height: 320px;
}

.scenario-head {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.scenario-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}

.scenario-icon svg {
    width: 22px;
    height: 22px;
    display: block;
}

.scenario-icon.blue {
    background: linear-gradient(135deg, #2f74ff 0%, #1f4ec9 100%);
}

.scenario-icon.purple {
    background: linear-gradient(135deg, #8e46ff 0%, #6b2fe0 100%);
}

.scenario-icon.orange {
    background: linear-gradient(135deg, #ff8a2a 0%, #eb5f00 100%);
}

.scenario-icon.cyan {
    background: linear-gradient(135deg, #11b6d8 0%, #0b8aa9 100%);
}

.scenario-icon.red {
    background: linear-gradient(135deg, #ff5a63 0%, #d8333d 100%);
}

.value-tag {
    display: inline-flex;
    align-items: center;
    margin-top: 24px;
    padding: 9px 16px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2bd673 0%, #15b258 100%);
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
}

.scenario-head h3 {
    font-size: 32px;
    margin-bottom: 2px;
    line-height: 1.2;
}

.role-subtitle {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 16px;
}

.role-questions h4 {
    font-size: 18px;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.role-questions ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.role-questions li {
    position: relative;
    padding-left: 18px;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.75;
}

.role-questions li::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-primary);
    position: absolute;
    left: 0;
    top: 9px;
}

.chat-shot {
    background: #ffffff;
    border: 1px solid #e6eaf2;
    border-radius: 14px;
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
    overflow: hidden;
    min-height: 320px;
}

.chat-shot.blue .mock-bar {
    background: linear-gradient(180deg, #2684ff 0%, #91c2ff 90%);
}

.chat-shot.purple .mock-bar {
    background: linear-gradient(180deg, #8e46ff 0%, #cfb1ff 90%);
}

.chat-shot.orange .mock-bar {
    background: linear-gradient(180deg, #ff8a2a 0%, #ffd0aa 90%);
}

.chat-shot.cyan .mock-search-line {
    background: #e7f8fc;
    border-color: #c7ebf4;
}

.chat-shot.red .mock-search-line {
    background: #ffeff0;
    border-color: #ffd5d8;
}

.mock-window-bar {
    height: 42px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 12px;
    background: linear-gradient(180deg, #f7f9fc 0%, #eef3fa 100%);
    border-bottom: 1px solid #e7edf6;
}

.mock-window-bar span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #d4dbe8;
}

.mock-window-bar span:first-child {
    background: #ff5f56;
}

.mock-window-bar span:nth-child(2) {
    background: #ffbd2e;
}

.mock-window-bar span:nth-child(3) {
    background: #27c93f;
}

.mock-window-bar em {
    margin-left: 8px;
    font-style: normal;
    font-size: 13px;
    color: #7c879a;
}

.mock-search-line {
    margin: 16px;
    height: 40px;
    border-radius: 8px;
    background: #eaf2ff;
    border: 1px solid #d6e5ff;
    display: flex;
    align-items: center;
    padding: 0 10px;
    gap: 8px;
}

.mock-search-icon {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid #7aa8f5;
    font-size: 10px;
    line-height: 14px;
    text-align: center;
    color: #4d7fcc;
    flex-shrink: 0;
}

.mock-search-text {
    font-size: 13px;
    color: #4b5b74;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mock-result-head {
    margin: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #8c98ac;
}

.mock-bars {
    margin: 12px 16px;
    height: 120px;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 0 6px;
    background: #f8fbff;
    border: 1px solid #ebf1f8;
    border-radius: 8px;
}

.mock-bar {
    flex: 1;
    border-radius: 6px 6px 0 0;
    min-height: 12px;
    background: linear-gradient(180deg, #2684ff 0%, #91c2ff 90%);
}

.mock-insight {
    margin: 0 16px 16px;
    border-radius: 8px;
    background: #f8fafc;
    border: 1px solid #e7ecf3;
    padding: 11px 12px;
    font-size: 13px;
    color: #58657a;
    line-height: 1.55;
}

.mock-sales-layout {
    margin: 12px 16px;
    display: grid;
    grid-template-columns: 112px 1fr;
    gap: 14px;
    align-items: center;
}

.mock-ring {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    background: conic-gradient(#8e46ff 0 58.4%, #ece6ff 58.4% 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mock-ring-inner {
    width: 74px;
    height: 74px;
    border-radius: 50%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: #6f39d4;
    font-weight: 700;
}

.mock-rank-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rank-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #5f6880;
    background: #f9f7ff;
    border: 1px solid #eee9ff;
    border-radius: 8px;
    padding: 8px 10px;
}

.rank-item b {
    color: #6f39d4;
    font-weight: 700;
}

.mock-metric-grid {
    margin: 12px 16px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.metric-item {
    background: #fff8f2;
    border: 1px solid #ffe6d2;
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-item span {
    font-size: 12px;
    color: #9b7a5c;
}

.metric-item b {
    font-size: 15px;
    color: #c65500;
}

.mock-line-chart {
    margin: 0 16px 12px;
    height: 44px;
    border-radius: 8px;
    background: #fff8f2;
    border: 1px solid #ffe6d2;
    position: relative;
}

.mock-line-chart .line {
    position: absolute;
    left: 8px;
    right: 8px;
    top: 55%;
    height: 2px;
    border-radius: 10px;
}

.mock-line-chart .line-orange {
    background: linear-gradient(90deg, #ff8a2a 0%, #eb5f00 100%);
}

.mock-followup-list {
    margin: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.followup-item {
    background: #f4fbfd;
    border: 1px solid #d4eff5;
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 12px;
    color: #406274;
    line-height: 1.5;
}

.followup-item span {
    color: #0a8fab;
    font-weight: 600;
}

.mock-safety-panel {
    margin: 12px 16px;
    border: 1px solid #ffd4d8;
    background: #fff6f7;
    border-radius: 10px;
    padding: 10px;
}

.safety-badge {
    display: inline-block;
    border-radius: 999px;
    background: #ff4d57;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    margin-bottom: 8px;
}

.mock-safety-panel p {
    font-size: 12px;
    color: #7a4a50;
    line-height: 1.6;
    margin-bottom: 8px;
}

.safety-actions {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.safety-actions span {
    font-size: 12px;
    color: #5f6d83;
    background: #ffffff;
    border: 1px solid #e5e9f2;
    border-radius: 7px;
    padding: 6px 8px;
}

/* ========================================
   使用流程
======================================== */
.how-it-works {
    padding: 120px 0;
    background: var(--bg-primary);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 280px;
    opacity: 0;
    transform: translateY(20px);
}

.step.revealed {
    opacity: 1;
    transform: translateY(0);
}

.step-number {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: white;
    font-size: 24px;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 24px;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.step-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.step-connector {
    width: 80px;
    height: 2px;
    background: var(--border-color);
    margin: 0 24px;
}

/* ========================================
   定价
======================================== */
.pricing {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 32px;
    position: relative;
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.pricing-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.pricing-card.featured {
    border-color: var(--accent-primary);
    box-shadow: 0 0 40px rgba(0, 102, 255, 0.15);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-primary);
    color: white;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-header {
    margin-bottom: 24px;
}

.plan-name {
    font-size: 22px;
    font-weight: 600;
}

.pricing-price {
    margin-bottom: 32px;
}

.pricing-price .currency {
    font-size: 24px;
    font-weight: 600;
    vertical-align: top;
}

.pricing-price .amount {
    font-size: 48px;
    font-weight: 700;
    line-height: 1;
}

.pricing-price .period {
    font-size: 16px;
    color: var(--text-muted);
}

.plan-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--text-secondary);
}

.plan-features svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.btn-pricing {
    display: block;
    text-align: center;
    padding: 14px 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.btn-pricing:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-pricing.primary {
    background: var(--accent-primary);
    border: none;
    color: white;
}

.btn-pricing.primary:hover {
    background: var(--accent-secondary);
}

/* ========================================
   FAQ
======================================== */
.faq {
    padding: 120px 0;
    background: var(--bg-primary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
}

.faq-question:hover {
    color: var(--accent-primary);
}

.faq-question svg {
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding-bottom: 24px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   即将上线页面
======================================== */
.coming-soon {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px;
    background: var(--bg-secondary);
}

.coming-content {
    text-align: center;
    max-width: 600px;
}

.coming-icon {
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    margin: 0 auto 32px;
}

.coming-icon--logo {
    background: transparent !important;
}

.coming-icon-img {
    width: 96px;
    height: 96px;
    object-fit: contain;
}

.coming-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.coming-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 700;
    margin-bottom: 16px;
}

.coming-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.coming-features h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-muted);
}

.features-preview {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 48px;
}

.feature-preview-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--accent-primary);
}

.feature-preview-item span {
    font-size: 13px;
    color: var(--text-secondary);
}

.coming-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 48px;
}

.btn-back,
.btn-try {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.btn-back {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-back:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-try {
    background: var(--accent-primary);
    color: white;
}

.btn-try:hover {
    background: var(--accent-secondary);
}

.notify-form {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.notify-form p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.email-subscribe {
    display: flex;
    gap: 12px;
}

.email-subscribe input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    outline: none;
}

.email-subscribe input:focus {
    border-color: var(--accent-primary);
}

.email-subscribe button {
    padding: 12px 24px;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
}

.email-subscribe button:hover {
    background: var(--accent-secondary);
}

/* ========================================
   响应式设计
======================================== */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-card:last-child {
        grid-column: span 2;
        max-width: 400px;
        justify-self: center;
    }

    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-brand {
        grid-column: span 3;
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-actions {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .module-spotlight {
        left: 12px;
        right: 12px;
        bottom: 12px;
        width: auto;
    }

    /* Hero区域移动端优化 */
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }

    .hero-content {
        padding: 0 16px;
    }

    .hero-badge {
        font-size: 12px;
        padding: 6px 12px;
        margin-bottom: 20px;
    }

    .hero-title {
        font-size: 32px;
        margin-bottom: 16px;
    }

    .hero-subtitle {
        font-size: 15px;
        margin-bottom: 24px;
    }

    .hero-actions {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 40px;
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        justify-content: center;
        padding: 14px 24px;
        font-size: 15px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .stat-item {
        text-align: center;
    }

    .stat-number {
        font-size: 28px;
    }

    .stat-label {
        font-size: 13px;
    }

    .stat-divider {
        width: 40px;
        height: 1px;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .product-card {
        padding: 24px 20px;
        gap: 16px;
    }

    .product-icon {
        width: 60px;
        height: 60px;
    }

    .product-icon--logo {
        width: 76px;
        height: 76px;
    }

    .product-icon-img {
        width: 62px;
        height: 62px;
    }

    .product-name {
        font-size: 19px;
    }

    .product-desc {
        font-size: 14px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .advantage-card {
        padding: 24px 20px;
    }

    .advantage-icon {
        width: 56px;
        height: 56px;
    }

    .advantage-card h3 {
        font-size: 17px;
    }

    .advantage-card p {
        font-size: 14px;
    }

    .ai-transformation-grid {
        grid-template-columns: 1fr;
    }

    .ai-transform-card {
        padding: 24px 20px;
    }

    .ai-transform-card h3 {
        font-size: 18px;
    }

    .ai-transform-card p {
        font-size: 14px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .case-card {
        padding: 24px 20px;
    }

    .case-quote {
        font-size: 15px;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card:last-child {
        grid-column: span 1;
        max-width: none;
    }

    .pricing-card {
        padding: 24px 20px;
    }

    .plan-name {
        font-size: 20px;
    }

    .pricing-price .amount {
        font-size: 40px;
    }

    .product-hero {
        flex-direction: column;
        text-align: center;
        padding: 100px 0 60px;
    }

    .product-hero .hero-content {
        text-align: center;
        padding: 0 16px;
    }

    .product-hero .hero-actions {
        justify-content: center;
    }

    .product-demo {
        padding: 40px 16px 0;
        width: 100%;
    }

    .result-dashboard {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 24px 20px;
    }

    .why-grid {
        grid-template-columns: 1fr;
    }

    .why-card {
        padding: 20px 18px;
        min-height: auto;
    }

    .scenario-row {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .scenario-row.reverse .scenario-info-card,
    .scenario-row.reverse .chat-shot,
    .scenario-row.reverse .screenshot-shot {
        order: initial;
    }

    .scenario-head h3 {
        font-size: 24px;
    }

    .role-subtitle,
    .role-questions li {
        font-size: 15px;
    }

    .steps {
        flex-direction: column;
        gap: 32px;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0;
    }

    .faq-question {
        font-size: 16px;
        padding: 20px 0;
    }

    .faq-answer p {
        font-size: 14px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-bottom: 40px;
    }

    .footer-brand {
        grid-column: span 1;
    }

    .footer-customer-service-col {
        grid-column: span 1;
    }

    .footer-links h4 {
        font-size: 15px;
        margin-bottom: 16px;
    }

    .footer-links a {
        font-size: 14px;
    }

    .email-subscribe {
        flex-direction: column;
    }

    .coming-soon {
        padding: 100px 16px 60px;
    }

    .coming-content {
        max-width: 100%;
    }

    .coming-icon {
        width: 100px;
        height: 100px;
    }

    .coming-title {
        font-size: 28px;
    }

    .coming-desc {
        font-size: 16px;
    }

    .features-preview {
        flex-direction: column;
        gap: 16px;
    }

    .coming-actions {
        flex-direction: column;
    }

    .btn-back,
    .btn-try {
        width: 100%;
        justify-content: center;
    }

    .notify-form {
        padding: 24px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    /* Hero区域小屏优化 */
    .hero {
        padding: 90px 0 50px;
    }

    .hero-title {
        font-size: 26px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .stat-number {
        font-size: 24px;
    }

    .stat-label {
        font-size: 12px;
    }

    /* 通用标题优化 */
    .section-title {
        font-size: 22px;
    }

    .section-desc {
        font-size: 14px;
    }

    /* 卡片内边距优化 */
    .product-card,
    .advantage-card,
    .feature-card,
    .case-card,
    .pricing-card,
    .ai-transform-card,
    .why-card {
        padding: 20px 16px;
    }

    /* 按钮优化 */
    .hero-actions {
        flex-direction: column;
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        justify-content: center;
    }

    .features-preview {
        flex-direction: column;
        gap: 16px;
    }

    .coming-actions {
        flex-direction: column;
    }

    .btn-back,
    .btn-try {
        width: 100%;
        justify-content: center;
    }

    /* 导航栏优化 */
    .navbar {
        padding: 12px 0;
    }

    .logo {
        font-size: 18px;
    }

    .site-logo-img {
        height: 0.9em;
    }

    /* 移动端菜单优化 */
    .mobile-menu {
        top: 60px;
        padding: 16px;
    }

    .mobile-menu a {
        padding: 10px 0;
        font-size: 15px;
    }

    /* 页脚优化 */
    .footer {
        padding: 50px 0 24px;
    }

    .footer-bottom p {
        font-size: 12px;
    }

    /* 架构图响应式 */
    .arch-blueprint {
        padding: 14px;
    }

    .bp-top-row,
    .bp-main-row,
    .bp-bottom-row,
    .bp-tool-grid,
    .bp-links {
        grid-template-columns: 1fr;
    }

    .bp-links span::before {
        content: "↓";
    }
}

/* ========================================
   系统架构图
======================================== */
.architecture {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.arch-diagram {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.arch-layer {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.arch-layer-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: 12px;
}

.arch-nodes {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.arch-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px 32px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    min-width: 140px;
    transition: var(--transition-normal);
}

.arch-node:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.arch-node.java {
    border-color: #F9731630;
    background: linear-gradient(135deg, #fff7ed 0%, #ffffff 100%);
}

.arch-node.java:hover {
    border-color: #F97316;
}

.arch-node.python {
    border-color: #3B82F630;
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}

.arch-node.python:hover {
    border-color: #3B82F6;
}

.arch-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
}

.arch-node.java .arch-icon {
    background: #F9731615;
    color: #F97316;
}

.arch-node.python .arch-icon {
    background: #3B82F615;
    color: #3B82F6;
}

.arch-node > span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.arch-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.arch-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.arch-desc {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

.arch-connector {
    display: flex;
    justify-content: center;
    padding: 16px 0;
}

.arch-arrow {
    width: 2px;
    height: 30px;
    background: linear-gradient(to bottom, var(--border-color), var(--accent-primary));
    position: relative;
}

.arch-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid var(--accent-primary);
}

/* 响应式 - 架构图 */
@media (max-width: 768px) {
    .arch-nodes {
        flex-direction: column;
        align-items: center;
    }

    .arch-node {
        width: 100%;
        max-width: 280px;
    }

    .backend-layer .arch-nodes {
        flex-direction: column;
    }
}

/* ========================================
   新版横向架构图（安全增强）
======================================== */
.framework-layer {
    border: 1px dashed #cfdcf1;
    border-radius: 14px;
    padding: 14px;
    background: #f8fbff;
}

.framework-layer h3 {
    font-size: 14px;
    color: #1d2f52;
    margin-bottom: 10px;
}

.framework-boxes {
    display: grid;
    gap: 10px;
}

.framework-boxes.two-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.framework-boxes.three-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.framework-boxes.four-cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.framework-box {
    background: #ffffff;
    border: 1px solid #e3eaf6;
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 12px;
    color: #55647c;
    min-height: 42px;
    display: flex;
    align-items: center;
}

.framework-layer.secure {
    background: linear-gradient(180deg, #f4f9ff 0%, #ecf5ff 100%);
    border-color: #c7dcfc;
}

.framework-layer.service {
    background: linear-gradient(180deg, #f6f4ff 0%, #f1ecff 100%);
    border-color: #d8cdff;
}

.framework-layer.data {
    background: linear-gradient(180deg, #f5fbf6 0%, #edf9f1 100%);
    border-color: #c9e6d4;
}

.framework-layer.govern {
    background: linear-gradient(180deg, #fff8f2 0%, #fff3e6 100%);
    border-color: #ffdcb4;
}

.framework-arrow {
    text-align: center;
    color: #7f94b7;
    font-size: 18px;
    line-height: 1;
    margin: 10px 0;
}

.arch-blueprint {
    background: #ffffff;
    border: 1px solid #dce7f8;
    border-radius: 18px;
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
    padding: 24px;
}

.bp-top-row,
.bp-main-row,
.bp-bottom-row {
    display: grid;
    gap: 14px;
}

.bp-top-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 18px;
}

.bp-mini-group,
.bp-column,
.bp-tool-group {
    border: 2px dashed #39a1ff;
    border-radius: 12px;
    background: #f8fbff;
    padding: 10px;
}

.bp-group-title,
.bp-col-title {
    font-size: 14px;
    color: #1F2937;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
}

.bp-mini-box {
    border: 1px solid #d9e6f8;
    background: #ffffff;
    border-radius: 8px;
    padding: 10px;
    font-size: 12px;
    color: #4f6282;
    text-align: center;
}

.bp-main-row {
    grid-template-columns: 1fr 1.1fr 1.1fr 1.3fr 1.2fr;
}

.bp-column {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.bp-column.core {
    background: #f4f9ff;
}

.bp-node {
    background: #ffffff;
    border: 1px solid #d9e6f8;
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 12px;
    color: #4f6282;
    line-height: 1.45;
    min-height: 40px;
    display: flex;
    align-items: center;
}

.bp-links {
    margin: 8px 0 16px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.bp-links span {
    text-align: center;
    font-size: 11px;
    color: #6a7f9d;
    position: relative;
    padding-top: 14px;
}

.bp-links span::before {
    content: "→";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    color: #728db7;
    font-weight: 700;
}

.bp-bottom-row {
    grid-template-columns: 1fr 1fr;
}

.bp-tool-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.bp-tool {
    border: 1px solid #d9e6f8;
    border-radius: 8px;
    background: #ffffff;
    padding: 10px 8px;
    text-align: center;
    font-size: 12px;
    color: #4f6282;
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .arch-blueprint {
        padding: 14px;
    }

    .bp-top-row,
    .bp-main-row,
    .bp-bottom-row,
    .bp-tool-grid,
    .bp-links {
        grid-template-columns: 1fr;
    }

    .bp-links span::before {
        content: "↓";
    }
}

/* ========================================
   智途志愿辅助 产品页
======================================== */
.zhitu-brand {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 8px;
}

.zhitu-logo {
    width: 96px;
    height: 96px;
    object-fit: contain;
    flex-shrink: 0;
    filter: drop-shadow(0 8px 20px rgba(47, 125, 246, 0.15));
}

.zhitu-brand-text .hero-title {
    margin-bottom: 0;
}

.zhitu-brand-text .hero-badge {
    margin-bottom: 12px;
}

.product-icon--logo {
    width: 88px;
    height: 88px;
    background: transparent !important;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2px;
}

.product-icon-img {
    width: 72px;
    height: 72px;
    object-fit: contain;
}

.zhitu-hero {
    background: linear-gradient(165deg, #f0f6ff 0%, #ffffff 45%, #f8fbff 100%);
    overflow: visible !important;
}

.product-hero.zhitu-hero .hero-content {
    max-width: min(720px, 100%);
    width: 100%;
    overflow: visible;
    box-sizing: border-box;
}

.zhitu-hero-gradient {
    background: radial-gradient(ellipse at 30% 20%, rgba(47, 125, 246, 0.18) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 60%, rgba(47, 125, 246, 0.08) 0%, transparent 50%);
}

.zhitu-hero-pattern {
    opacity: 0.35;
    background-image: linear-gradient(rgba(47, 125, 246, 0.04) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(47, 125, 246, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
}

.zhitu-badge {
    background: rgba(47, 125, 246, 0.12) !important;
    border-color: rgba(47, 125, 246, 0.35) !important;
    color: #1e5fd4 !important;
}

.zhitu-gradient-text {
    background: linear-gradient(135deg, #2f7df6 0%, #5b9dff 50%, #1e5fd4 100%) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    white-space: nowrap;
}

.zhitu-hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0 8px;
}

.zhitu-hero-tags span {
    font-size: 13px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid #d4e4fc;
    color: #3b5f9a;
}

.zhitu-btn-primary {
    background: linear-gradient(135deg, #2f7df6 0%, #1e5fd4 100%) !important;
    border: none;
}

.zhitu-btn-secondary {
    border-color: #2f7df6 !important;
    color: #2f7df6 !important;
}

.zhitu-hero-scan {
    justify-content: flex-start;
    margin-bottom: 48px;
}

.zhitu-wechat-entry {
    display: inline-flex;
    align-items: center;
    gap: 20px;
    padding: 16px 20px;
    background: #fff;
    border: 1px solid #d4e4fc;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(47, 125, 246, 0.12);
}

.zhitu-qrcode {
    display: block;
    width: 108px;
    height: 108px;
    flex-shrink: 0;
}

.zhitu-wechat-entry-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
}

.zhitu-wechat-search-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #353535;
    font-size: 20px;
    font-weight: 500;
    line-height: 1.2;
}

.zhitu-wechat-search-icon {
    display: block;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    object-fit: contain;
}

.zhitu-wechat-search-bar {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: #07c160;
    border-radius: 6px;
    color: #fff;
    font-size: 15px;
    font-weight: 500;
    line-height: 1.2;
    white-space: nowrap;
}

.zhitu-wechat-search-magnifier {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.zhitu-metrics,
.zhitu-hero-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 4px;
    width: 100%;
    max-width: 100%;
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid #e2ebfa;
    box-sizing: border-box;
}

.zhitu-metric,
.zhitu-stat {
    text-align: center;
    padding: 12px 4px;
    min-width: 0;
}

.zhitu-metric:not(:last-child),
.zhitu-stat:not(:last-child) {
    border-right: 1px solid #dce8fa;
}

.zhitu-metric strong,
.zhitu-stat strong {
    display: block;
    font-size: clamp(18px, 2.2vw, 22px);
    font-weight: 700;
    color: #1e5fd4;
    line-height: 1.2;
}

.zhitu-metric span,
.zhitu-stat span {
    display: block;
    font-size: 11px;
    color: #6b7f9f;
    line-height: 1.35;
    margin-top: 4px;
    white-space: nowrap;
}

.zhitu-stat-divider {
    display: none;
}

.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
    padding: 6px;
    background: #1a1a1a;
    border-radius: 30px;
    box-shadow: 0 24px 48px rgba(30, 95, 212, 0.2), 0 8px 24px rgba(0, 0, 0, 0.12);
}

.phone-mockup--sm {
    max-width: 260px;
}

.phone-notch {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 78px;
    height: 14px;
    background: #1a1a1a;
    border-radius: 0 0 9px 9px;
    z-index: 2;
}

.phone-mockup img {
    display: block;
    width: 100%;
    border-radius: 24px;
    background: #f2f6ff;
}

.zhitu-hero-demo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.zhitu-tag {
    background: #e8f1ff !important;
    color: #1e5fd4 !important;
}

.zhitu-highlights {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.zhitu-highlight-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.zhitu-highlight-card {
    background: #fff;
    border: 1px solid #e2ebfa;
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.zhitu-highlight-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(47, 125, 246, 0.12);
}

.zhitu-highlight-icon {
    font-size: 36px;
    margin-bottom: 16px;
    line-height: 1;
}

.zhitu-highlight-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.zhitu-highlight-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.zhitu-steps {
    padding: 100px 0;
}

.zhitu-step-flow {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: stretch;
    margin-top: 48px;
}

.zhitu-step-card {
    background: #fff;
    border: 1px solid #e2ebfa;
    border-radius: var(--radius-xl);
    padding: 32px 28px;
}

.zhitu-step-card--primary {
    border-color: #2f7df6;
    background: linear-gradient(180deg, #f5f9ff 0%, #fff 100%);
    box-shadow: 0 12px 40px rgba(47, 125, 246, 0.12);
}

.zhitu-step-num {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: #2f7df6;
    background: #e8f1ff;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 16px;
}

.zhitu-step-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.zhitu-step-card > p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.zhitu-step-card ul {
    list-style: none;
    padding: 0;
}

.zhitu-step-card li {
    font-size: 14px;
    color: #4a6285;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.zhitu-step-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2f7df6;
}

.zhitu-step-arrow {
    display: flex;
    align-items: center;
    font-size: 32px;
    color: #2f7df6;
    font-weight: 300;
}

.zhitu-showcase {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.zhitu-showcase-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 80px;
}

.zhitu-showcase-row:last-child {
    margin-bottom: 0;
}

.zhitu-showcase-row.reverse .zhitu-showcase-text {
    order: 2;
}

.zhitu-showcase-row.reverse .zhitu-showcase-visual {
    order: 1;
}

.zhitu-showcase-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #2f7df6;
    background: #e8f1ff;
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.zhitu-showcase-text h3 {
    font-size: clamp(24px, 3vw, 32px);
    margin-bottom: 16px;
    line-height: 1.35;
}

.zhitu-showcase-text > p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.zhitu-check-list {
    list-style: none;
    padding: 0;
}

.zhitu-check-list li {
    font-size: 15px;
    color: #3d5278;
    padding: 10px 0 10px 28px;
    position: relative;
}

.zhitu-check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #2f7df6;
    font-weight: 700;
}

.zhitu-showcase-duo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.zhitu-tier {
    padding: 100px 0;
}

.zhitu-tier-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.zhitu-tier-card {
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    border: 1px solid #e2ebfa;
    background: #fff;
}

.zhitu-tier-card--chong {
    border-top: 4px solid #ef4444;
}

.zhitu-tier-card--wen {
    border-top: 4px solid #2f7df6;
}

.zhitu-tier-card--bao {
    border-top: 4px solid #10b981;
}

.zhitu-tier-badge {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 6px;
    margin-bottom: 16px;
}

.zhitu-tier-card--chong .zhitu-tier-badge {
    background: #fef2f2;
    color: #dc2626;
}

.zhitu-tier-card--wen .zhitu-tier-badge {
    background: #e8f1ff;
    color: #1e5fd4;
}

.zhitu-tier-card--bao .zhitu-tier-badge {
    background: #ecfdf5;
    color: #059669;
}

.zhitu-tier-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.zhitu-tier-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.zhitu-tools {
    padding: 100px 0;
}

.zhitu-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 48px;
}

.zhitu-tool-card {
    background: var(--bg-secondary);
    border: 1px solid #e8eef8;
    border-radius: var(--radius-md);
    padding: 24px 20px;
    text-align: center;
    transition: border-color var(--transition-normal), background var(--transition-normal);
}

.zhitu-tool-card:hover {
    border-color: #b8d4fc;
    background: #f5f9ff;
}

.zhitu-tool-emoji {
    font-size: 32px;
    display: block;
    margin-bottom: 12px;
}

.zhitu-tool-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.zhitu-tool-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.zhitu-faq {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.zhitu-faq .faq-item {
    background: #fff;
    border: 1px solid #e2ebfa;
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    padding: 4px 20px;
}

.zhitu-faq .faq-item summary {
    cursor: pointer;
    font-weight: 600;
    padding: 16px 0;
    list-style: none;
}

.zhitu-faq .faq-item summary::-webkit-details-marker {
    display: none;
}

.zhitu-faq .faq-item p {
    padding-bottom: 16px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.zhitu-cta {
    background: linear-gradient(135deg, #1e5fd4 0%, #2f7df6 50%, #4d8fff 100%);
}

.zhitu-cta-logo {
    width: 72px;
    height: 72px;
    object-fit: contain;
    margin: 0 auto 20px;
    display: block;
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.15));
}

.zhitu-cta-content .cta-title,
.zhitu-cta-content .cta-desc {
    color: #fff;
}

.zhitu-cta-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 24px 0 32px;
}

.zhitu-cta-tags span {
    font-size: 13px;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.zhitu-cta .btn-cta-primary {
    background: #fff !important;
    color: #1e5fd4 !important;
}

@media (max-width: 1024px) {
    .zhitu-highlight-grid,
    .zhitu-tier-grid,
    .zhitu-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .zhitu-showcase-row {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .zhitu-showcase-row.reverse .zhitu-showcase-text,
    .zhitu-showcase-row.reverse .zhitu-showcase-visual {
        order: unset;
    }
}

@media (max-width: 768px) {
    .product-hero.zhitu-hero {
        flex-direction: column;
        padding-top: 100px;
    }

    .zhitu-brand {
        flex-direction: column;
        text-align: center;
    }

    .zhitu-brand-text .hero-badge {
        margin-left: auto;
        margin-right: auto;
    }

    .zhitu-hero-scan {
        justify-content: center;
    }

    .zhitu-wechat-entry {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 16px;
        gap: 16px;
    }

    .zhitu-qrcode {
        width: 96px;
        height: 96px;
    }

    .zhitu-wechat-entry-info {
        align-items: center;
    }

    .zhitu-wechat-search-brand {
        font-size: 18px;
    }

    .zhitu-wechat-search-bar {
        font-size: 14px;
    }

    .zhitu-metrics,
    .zhitu-hero-stats {
        gap: 0 2px;
        padding-top: 20px;
    }

    .zhitu-metric strong,
    .zhitu-stat strong {
        font-size: 17px;
    }

    .zhitu-metric span,
    .zhitu-stat span {
        font-size: 10px;
        white-space: normal;
    }

    .zhitu-highlight-grid,
    .zhitu-tier-grid,
    .zhitu-tools-grid,
    .zhitu-step-flow {
        grid-template-columns: 1fr;
    }

    .zhitu-step-arrow {
        justify-content: center;
        transform: rotate(90deg);
    }

    .zhitu-showcase-duo {
        grid-template-columns: 1fr;
    }
}