@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300 900;
    font-display: swap;
    src: url('../fonts/Inter.woff2') format('woff2');
}

/* ============================================
   Doin Technology - 官网样式表
   ============================================ */

/* --- Font Faces --- */
@font-face {
    font-family: 'SF Pro Rounded';
    src: url('../fonts/SF-Pro-Rounded-Bold-Subset.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'SF Pro Rounded';
    src: url('../fonts/SF-Pro-Rounded-Light-Subset.woff2') format('woff2');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

/* --- CSS Variables --- */
:root {
    --primary: #3B7DD8;
    --primary-dark: #2D6BBF;
    --primary-light: #5A9AE0;
    --dark: #1a1a2e;
    --dark-secondary: #2d2d44;
    --text: #2d2d44;
    --text-light: #6b7280;
    --text-lighter: #9ca3af;
    --bg-gradient-start: #e8f0fe;
    --bg-gradient-end: #E8E4F0;
    --white: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.9);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-sm: 8px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: linear-gradient(160deg, #BDD4E7 0%, #C8DCE8 20%, #D8DCE8 40%, #E0DCE8 60%, #E8E4F0 80%, #F0ECF4 100%);
    background-attachment: fixed;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* 噪点纹理叠加层 - 液态玻璃质感 (参考 haoqi.design) */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    opacity: 0.035;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

/* --- Ripple Canvas --- */
#rippleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

/* --- Section Container --- */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 3;
}

/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 1px;
    margin-bottom: 16px;
    font-family: 'Inter', monospace;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--dark);
    line-height: 1.3;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 17px;
    color: var(--text-light);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 12px;
    left: 12px;
    right: 12px;
    z-index: 1000;
    padding: 10px 0;
    transition: var(--transition);
    border-radius: 16px;
    /* Apple 液态玻璃效果 */
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    /* 玻璃边缘高光 - 顶部亮、底部暗，营造3D厚度感 */
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-top-color: rgba(255, 255, 255, 0.7);
    border-bottom-color: rgba(255, 255, 255, 0.2);
    /* 内部阴影 - 增加玻璃深度 */
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.04),
        0 4px 16px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        inset 0 -1px 0 rgba(255, 255, 255, 0.1);
}

.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 16px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0.02) 40%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.35);
    backdrop-filter: blur(30px) saturate(200%);
    -webkit-backdrop-filter: blur(30px) saturate(200%);
    border-color: rgba(255, 255, 255, 0.6);
    border-top-color: rgba(255, 255, 255, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.3);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.04),
        0 8px 32px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.7),
        inset 0 -1px 0 rgba(255, 255, 255, 0.15);
    top: 8px;
    left: 8px;
    right: 8px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 1;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--dark);
}

.logo-img {
    height: 22px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::before {
    content: '//';
    margin-right: 2px;
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
}

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

/* Scroll Spy 激活状态 - 液态玻璃胶囊样式 */
.nav-links a.nav-active {
    color: var(--primary) !important;
    font-weight: 700 !important;
    padding: 6px 16px !important;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.35) !important;
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    border-top-color: rgba(255, 255, 255, 0.7) !important;
    border-bottom-color: rgba(255, 255, 255, 0.25) !important;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-cta {
    /* 默认状态和普通链接一致，无特殊底色 */
    transition: var(--transition);
}

.nav-cta:hover {
    color: var(--primary) !important;
}

/* nav-cta scroll spy 激活态 - 液态玻璃高亮 */
.nav-cta.nav-active {
    color: var(--primary) !important;
    font-weight: 700 !important;
    padding: 6px 16px !important;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.35) !important;
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    border-top-color: rgba(255, 255, 255, 0.7) !important;
    border-bottom-color: rgba(255, 255, 255, 0.25) !important;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Language Toggle --- */
.lang-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 16px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        0 1px 4px rgba(0, 0, 0, 0.06);
    letter-spacing: 0.5px;
    margin-right: 16px;
}

.lang-toggle:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-1px);
}

.lang-toggle:active {
    transform: translateY(0);
}

.lang-label {
    line-height: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 2;
    padding: 140px 0 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(108, 99, 255, 0.08);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 24px;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.title-brand {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.title-sub {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 300;
    color: var(--dark);
    font-size: 48px;
}

/* --- Brand Name Typography --- */
.brand-doin {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand-tech {
    font-family: 'SF Pro Rounded', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 300;
    letter-spacing: -0.01em;
}

.hero-subtitle {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.4;
    margin-bottom: 20px;
}

.highlight-text {
    color: var(--dark);
    position: relative;
}

.hero-desc {
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--dark);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(26, 26, 46, 0.3);
    border: 2px solid var(--primary);
}

.btn-primary:hover {
    background: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(108, 99, 255, 0.4);
}

.btn-secondary {
    background: var(--primary);
    color: var(--white);
    opacity: 0.85;
}

.btn-secondary:hover {
    opacity: 1;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(108, 99, 255, 0.3);
}

.btn-full {
    width: 100%;
}

.hero-stats {
    font-size: 15px;
    color: var(--text-lighter);
}

.hero-stats strong {
    color: var(--dark);
    font-weight: 700;
}

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

.three-container {
    width: 100%;
    height: 500px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    cursor: crosshair;
}

.three-container canvas {
    width: 100% !important;
    height: 100% !important;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   About Section
   ============================================ */
.about {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

.about-stats-grid {
    margin-bottom: 40px;
}

.about-text {
    text-align: center;
    margin-bottom: 40px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    white-space: nowrap;
}

.stat-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-prefix {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-right: 2px;
}

.stat-unit {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
    margin-left: 2px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 8px;
    font-weight: 500;
}

/* ============================================
   Services Section
   ============================================ */
.services {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.service-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 20px;
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.service-tagline {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 16px;
}

.service-desc {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-list {
    list-style: none;
    margin-bottom: 24px;
}

.service-list li {
    font-size: 14px;
    color: var(--text);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0.5;
}

.service-price {
    padding-top: 20px;
    border-top: 1px solid rgba(108, 99, 255, 0.1);
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
}

.price-label {
    font-size: 13px;
    color: var(--text-lighter);
    font-weight: 500;
}

.price-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
}

.price-unit {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
}

.price-note {
    font-size: 12px;
    color: var(--text-lighter);
}

/* ============================================
   Why Us Section
   ============================================ */
.why-us {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

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

.why-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.why-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.why-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
}

.why-icon svg {
    width: 100%;
    height: 100%;
}

.why-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

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

/* ============================================
   Process Section
   ============================================ */
.process {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

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

.process-timeline::before {
    content: '';
    position: absolute;
    top: 36px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light), var(--primary));
    opacity: 0.2;
}

.process-step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(108, 99, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    margin: 0 auto 20px;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.process-step:hover .step-number {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.step-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   Platforms Section
   ============================================ */
.platforms {
    padding: 80px 0;
    position: relative;
    z-index: 2;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.platform-item {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    transition: var(--transition);
}

.platform-item small {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-lighter);
    margin-top: 4px;
}

.platform-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(108, 99, 255, 0.3);
}

/* ============================================
   Cases Section
   ============================================ */
.cases {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.case-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-tag {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
}

.case-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.case-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 24px;
}

.case-metrics {
    display: flex;
    gap: 16px;
    padding-top: 20px;
    border-top: 1px solid rgba(108, 99, 255, 0.1);
}

.metric {
    flex: 1;
    text-align: center;
}

.metric-value {
    display: block;
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.metric-label {
    font-size: 11px;
    color: var(--text-lighter);
    font-weight: 500;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    padding: 100px 0;
    position: relative;
    z-index: 2;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: start;
}

.contact-form-wrapper {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    border: 1.5px solid rgba(108, 99, 255, 0.15);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font-sans);
    color: var(--text);
    background: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1);
    background: var(--white);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.contact-info-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.contact-info-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(108, 99, 255, 0.08);
}

.contact-item:last-of-type {
    border-bottom: none;
}

.contact-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-label {
    display: block;
    font-size: 12px;
    color: var(--text-lighter);
    font-weight: 500;
}

.contact-value {
    display: block;
    font-size: 15px;
    color: var(--dark);
    font-weight: 600;
}

.wechat-qr {
    margin-top: 24px;
    display: flex;
    justify-content: center;
}

.qr-placeholder {
    width: 160px;
    height: 160px;
    background: rgba(108, 99, 255, 0.05);
    border: 2px dashed rgba(108, 99, 255, 0.2);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.qr-placeholder span {
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

.qr-placeholder small {
    font-size: 11px;
    color: var(--text-lighter);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    position: relative;
    z-index: 2;
    padding: 60px 0 30px;
    border-top: 1px dashed rgba(108, 99, 255, 0.15);
}

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

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-logo {
    font-size: 20px;
    color: var(--dark);
}

.footer-logo-img {
    height: 24px;
    width: auto;
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-lighter);
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.footer-col a {
    font-size: 14px;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(108, 99, 255, 0.08);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-lighter);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        order: -1;
    }

    .three-container {
        height: 350px;
    }

    .hero-title {
        font-size: 44px;
    }

    .title-sub {
        font-size: 38px;
    }

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

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

    .about-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        margin-bottom: 30px;
    }

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

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

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.3);
        backdrop-filter: blur(24px) saturate(180%);
        -webkit-backdrop-filter: blur(24px) saturate(180%);
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        box-shadow:
            0 4px 20px rgba(0, 0, 0, 0.08),
            inset 0 1px 0 rgba(255, 255, 255, 0.5);
        border: 1px solid rgba(255, 255, 255, 0.5);
        border-top-color: rgba(255, 255, 255, 0.6);
        border-bottom-color: rgba(255, 255, 255, 0.2);
        border-radius: 16px;
    }

    .nav-links.active {
        display: flex;
    }

    .lang-toggle {
        margin-right: 8px;
        padding: 5px 12px;
        font-size: 12px;
    }

    .nav-toggle {
        display: flex;
    }

    /* 移动端隐藏3D球体，避免首屏看不到文字 */
    .hero-visual {
        display: none !important;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .title-sub {
        font-size: 30px;
    }

    .hero-subtitle {
        font-size: 22px;
    }

    .section-title {
        font-size: 30px;
    }

    .about-stats-grid {
        grid-template-columns: 1fr;
    }

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

    .process-timeline {
        grid-template-columns: 1fr;
    }

    .process-timeline::before {
        display: none;
    }

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

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

    .footer-top {
        flex-direction: column;
    }

    .footer-links {
        gap: 30px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .title-sub {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 24px;
    }

    .about-stats-grid {
        grid-template-columns: 1fr;
    }

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

    .case-metrics {
        flex-direction: column;
        gap: 12px;
    }
}