/* ========================================
   LEKUIDC 安卓 App 定制开发 - 着陆页样式
   ======================================== */

:root {
    --primary: #3DDC84;
    --primary-dark: #1B8F6E;
    --primary-light: #6ee7a8;
    --secondary: #073042;
    --accent: #4285F4;
    --accent-light: #7baaf7;
    --phone-bg: #121212;
    --phone-panel: #1e1e1e;
    --phone-surface: #2d2d2d;
    --phone-accent: #3DDC84;
    --dark: #0f172a;
    --dark-light: #1e3a5f;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --gradient-1: linear-gradient(135deg, #073042 0%, #1B8F6E 50%, #3DDC84 100%);
    --gradient-2: linear-gradient(135deg, #1B8F6E 0%, #3DDC84 100%);
    --gradient-3: linear-gradient(135deg, #4285F4 0%, #7baaf7 100%);
    --gradient-gold: linear-gradient(135deg, #073042 0%, #3DDC84 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;
    --transition: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-1);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(61, 220, 132, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(61, 220, 132, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(14, 116, 144, 0.05);
}

.btn-accent {
    background: var(--gradient-3);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(217, 119, 6, 0.35);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(217, 119, 6, 0.45);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.logo i {
    font-size: 1.75rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-sub {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--gray-500);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-left: -0.25rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lang-badge {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--gray-100);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-600);
}

.lang-badge i {
    color: var(--primary);
    font-size: 0.875rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition);
}

/* Hero */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 15% 50%, rgba(61, 220, 132, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 85% 20%, rgba(66, 133, 244, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 90%, rgba(7, 48, 66, 0.1) 0%, transparent 50%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(61, 220, 132, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(61, 220, 132, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: float 20s infinite linear;
}

@keyframes float {
    0%, 100% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10%, 90% { opacity: 0.3; }
    100% {
        transform: translateY(-100vh) rotate(720deg);
        opacity: 0;
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(14, 116, 144, 0.1);
    border: 1px solid rgba(14, 116, 144, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-dark);
    margin-bottom: 1.5rem;
}

.badge i {
    color: var(--accent);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-gold {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    max-width: 520px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    color: var(--gray-600);
    box-shadow: var(--shadow-sm);
}

.hero-tag i {
    color: var(--primary);
    font-size: 0.75rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Hero Android 手机视觉 */
.hero-visual {
    position: relative;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-image-wrapper {
    position: relative;
    padding: 1.5rem;
}

.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
    padding: 12px;
    background: linear-gradient(145deg, #2a2a2a 0%, #1a1a1a 100%);
    border-radius: 36px;
    box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(61, 220, 132, 0.2), inset 0 0 0 2px rgba(255, 255, 255, 0.06);
}

.phone-notch {
    width: 80px;
    height: 22px;
    background: #0a0a0a;
    border-radius: 0 0 14px 14px;
    margin: 0 auto 8px;
}

.phone-screen {
    background: var(--phone-bg);
    border-radius: 24px;
    overflow: hidden;
    min-height: 420px;
    display: flex;
    flex-direction: column;
}

.phone-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem 0.25rem;
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

.phone-status-icons {
    display: flex;
    gap: 0.375rem;
    font-size: 0.625rem;
}

.phone-app-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--phone-panel);
}

.phone-app-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.125rem;
}

.phone-app-bar h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
}

.phone-app-bar span {
    font-size: 0.75rem;
    color: var(--primary);
}

.phone-content {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.phone-card {
    padding: 0.875rem;
    background: var(--phone-surface);
    border-radius: var(--radius-lg);
    opacity: 0;
    animation: cardIn 0.5s ease forwards;
}

.phone-card:nth-child(1) { animation-delay: 0.3s; }
.phone-card:nth-child(2) { animation-delay: 0.55s; }
.phone-card:nth-child(3) { animation-delay: 0.8s; }

@keyframes cardIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.phone-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.phone-card-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #fff;
}

.phone-card-badge {
    font-size: 0.625rem;
    padding: 0.2rem 0.5rem;
    background: rgba(61, 220, 132, 0.2);
    color: var(--primary);
    border-radius: var(--radius-full);
}

.phone-card-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.phone-card-desc {
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.45);
    margin-top: 0.25rem;
}

.phone-progress {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.phone-progress-bar {
    height: 100%;
    width: 72%;
    background: var(--gradient-1);
    border-radius: 2px;
    animation: progressGrow 2s ease 1s forwards;
    width: 0;
}

@keyframes progressGrow {
    to { width: 72%; }
}

.phone-nav {
    display: flex;
    justify-content: space-around;
    padding: 0.75rem;
    background: var(--phone-panel);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.phone-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.625rem;
    color: rgba(255, 255, 255, 0.4);
}

.phone-nav-item.active {
    color: var(--primary);
}

.phone-nav-item i {
    font-size: 1rem;
}

/* 技术栈 */
.tech {
    background: var(--white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
}

.tech-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.625rem;
    padding: 1.25rem 0.75rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-xl);
    transition: var(--transition);
    text-align: center;
}

.tech-card:hover {
    border-color: var(--primary);
    background: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.tech-card i {
    font-size: 1.75rem;
    color: var(--primary);
}

.tech-card span {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--dark);
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    animation: floatCard 3s ease-in-out infinite;
    z-index: 2;
    border: 1px solid var(--gray-100);
}

.floating-card i {
    font-size: 1rem;
    color: var(--primary);
}

.card-1 { top: 5%; right: -5%; animation-delay: 0s; }
.card-2 { top: 45%; left: -12%; animation-delay: 0.5s; }
.card-3 { bottom: 10%; right: 0; animation-delay: 1s; }

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-400);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--gray-400);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--gray-400);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* 通用区块 */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: rgba(14, 116, 144, 0.1);
    color: var(--primary-dark);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--gray-600);
}

/* 服务 */
.services {
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.service-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.service-card.featured {
    border: 2px solid var(--primary);
}

.service-card.featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
}

.service-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    background: var(--gradient-3);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.service-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 116, 144, 0.1);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 1.5rem;
    color: var(--primary);
}

.service-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.service-description {
    font-size: 0.9375rem;
    color: var(--gray-600);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.service-features {
    margin-bottom: 1.5rem;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.service-features li i {
    font-size: 0.75rem;
    color: #22c55e;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary);
}

.service-link:hover {
    gap: 0.75rem;
}

/* 行业覆盖 */
.industries {
    background: var(--white);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
}

.industry-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 1rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-xl);
    transition: var(--transition);
    text-align: center;
}

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

.industry-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    border-radius: var(--radius-lg);
    color: var(--white);
    font-size: 1.25rem;
}

.industry-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark);
}

/* 建站流程 */
.process {
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 2.5rem;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    opacity: 0.3;
    z-index: 0;
}

.process-step {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 0.5rem;
}

.process-number {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    background: var(--gradient-1);
    color: var(--white);
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(14, 116, 144, 0.35);
}

.process-step h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.process-step p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* 数据统计 */
.stats {
    background: var(--dark);
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(14, 116, 144, 0.2) 0%, transparent 60%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    position: relative;
    z-index: 1;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(34, 211, 238, 0.3);
}

.stat-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 116, 144, 0.25);
    border-radius: var(--radius-lg);
}

.stat-icon i {
    font-size: 1.5rem;
    color: var(--primary-light);
}

.stat-content {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.25rem;
}

.stat-number-large {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-light);
}

.stat-label-large {
    width: 100%;
    font-size: 0.9375rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

/* 案例 */
.cases-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1.5rem;
}

.case-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    position: relative;
    overflow: hidden;
}

.case-placeholder {
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder i {
    font-size: 3rem;
    color: var(--white);
    opacity: 0.9;
}

.case-card.large .case-placeholder {
    aspect-ratio: 16/9;
}

.case-card.large .case-placeholder i {
    font-size: 4rem;
}

.case-content {
    padding: 1.5rem;
}

.case-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(14, 116, 144, 0.1);
    color: var(--primary-dark);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 0.75rem;
}

.case-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.case-description {
    font-size: 0.9375rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.case-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.case-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.case-meta i {
    color: var(--accent);
    font-size: 0.75rem;
}

.case-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary);
}

.case-link:hover {
    gap: 0.75rem;
}

/* 合作伙伴 */
.partners {
    background: var(--gray-50);
    padding: 3rem 0;
}

.partners-title {
    text-align: center;
    font-size: 0.9375rem;
    color: var(--gray-500);
    margin-bottom: 2rem;
}

.partners-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.partner-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 2rem;
    color: var(--gray-400);
    transition: var(--transition);
}

.partner-logo span {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--gray-400);
    letter-spacing: 0.02em;
}

.partner-logo:hover {
    color: var(--primary);
}

.partner-logo:hover span {
    color: var(--primary);
}

/* 联系 */
.contact {
    background: var(--gray-50);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: start;
}

.contact-info .section-tag,
.contact-info .section-title {
    text-align: left;
}

.contact-description {
    font-size: 1.0625rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
}

.contact-details {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 116, 144, 0.1);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.25rem;
    color: var(--primary);
}

.contact-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.contact-text p {
    font-size: 0.9375rem;
    color: var(--gray-600);
}

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.8125rem;
    color: var(--gray-600);
}

.trust-badge i {
    color: var(--accent);
}

.contact-form-wrapper {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border-top: 3px solid transparent;
    border-image: var(--gradient-1) 1;
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    color: var(--gray-700);
    background: var(--white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14, 116, 144, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
.footer {
    background: var(--dark);
    color: var(--gray-300);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-description {
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: var(--gray-400);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 1.25rem;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--gray-400);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
    padding-left: 0.25rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* 回到顶部 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    color: var(--white);
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* 响应式 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text { order: 1; }
    .hero-visual { order: 0; }

    .hero-description,
    .hero-tags {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-tags { justify-content: center; }
    .hero-buttons { justify-content: center; }
    .hero-stats { justify-content: center; }

    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .industries-grid { grid-template-columns: repeat(3, 1fr); }
    .tech-grid { grid-template-columns: repeat(3, 1fr); }
    .process-timeline { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
    .process-timeline::before { display: none; }

    .cases-grid { grid-template-columns: 1fr 1fr; }
    .case-card.large { grid-column: span 2; }

    .contact-wrapper { grid-template-columns: 1fr; gap: 3rem; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-2xl);
        transition: var(--transition);
    }

    .nav-menu.active { right: 0; }
    .lang-badge { display: none; }
    .mobile-menu-toggle { display: flex; }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-title { font-size: 2.5rem; }
    .section-title { font-size: 2rem; }

    .services-grid { grid-template-columns: 1fr; }
    .industries-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .process-timeline { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr; }
    .case-card.large { grid-column: span 1; }

    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }

    .footer-bottom {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-buttons { flex-direction: column; }
    .hero-stats { flex-direction: column; gap: 1.5rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .stat-card { flex-direction: column; text-align: center; }
    .partners-logos { gap: 2rem; }
    .partner-logo { font-size: 1.75rem; }
}

/* 动画 */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}