/* ========================================
   智游引擎官网 - 样式表
   ======================================== */

/* CSS 变量 */
:root {
    --primary: #00d4ff;
    --primary-dark: #00a8cc;
    --secondary: #7b2cbf;
    --accent: #ff006e;
    --bg-deep: #050508;
    --bg-dark: #0a0a0f;
    --bg-card: rgba(15, 15, 25, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --border: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(0, 212, 255, 0.3);
    --gradient-1: linear-gradient(135deg, #00d4ff 0%, #7b2cbf 100%);
    --gradient-2: linear-gradient(90deg, #00d4ff, #ff006e);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
    transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease !important;
}

[data-theme="light"] {
    --bg-deep: #f8f9fc;
    --bg-dark: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-glass: rgba(0, 0, 0, 0.03);
    --text-primary: #0f172a;
    --text-secondary: rgba(15, 23, 42, 0.65);
    --text-muted: rgba(15, 23, 42, 0.45);
    --border: rgba(15, 23, 42, 0.1);
    --border-hover: rgba(0, 212, 255, 0.4);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.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);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(5, 5, 8, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    flex-shrink: 0;
}

.logo svg {
    color: var(--primary);
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
    flex-shrink: 0;
}

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

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-links .nav-cta {
    padding: 8px 18px;
    background: var(--gradient-1);
    border-radius: 20px;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.nav-links .nav-cta::after {
    display: none;
}

.nav-links .nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-links .nav-download {
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--primary);
    border-radius: 20px;
    color: var(--primary);
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.875rem;
}

.nav-links .nav-download:hover {
    background: var(--primary);
    color: var(--bg-deep);
    transform: translateY(-2px);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    z-index: 1001;
    font-weight: 700;
    font-size: 0.8125rem;
}

.lang-toggle:hover {
    border-color: var(--border-hover);
    color: var(--primary);
    transform: scale(1.05);
}

.lang-current {
    pointer-events: none;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    z-index: 1001;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    color: var(--primary);
    transform: rotate(15deg);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    transition: var(--transition);
}

.theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

.theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-toggle .sun-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-toggle .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    position: relative;
    z-index: 1001;
    margin-left: 4px;
}

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

/* ========================================
   Hero区域
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 80px;
}

#heroCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

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

.hero-logo {
    margin-bottom: 28px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-logo img {
    width: 140px;
    height: 140px;
    border-radius: 28px;
    object-fit: cover;
    filter: drop-shadow(0 0 30px rgba(0, 212, 255, 0.35)) drop-shadow(0 0 60px rgba(123, 44, 191, 0.2));
    transition: var(--transition);
    animation: logoFloat 6s ease-in-out infinite;
}

.hero-logo img:hover {
    transform: scale(1.08);
    filter: drop-shadow(0 0 40px rgba(0, 212, 255, 0.5)) drop-shadow(0 0 80px rgba(123, 44, 191, 0.35));
}

[data-theme="light"] .hero-logo img {
    filter: drop-shadow(0 8px 32px rgba(0, 0, 0, 0.12)) drop-shadow(0 0 20px rgba(0, 212, 255, 0.15));
    border: 2px solid rgba(0, 212, 255, 0.15);
}

[data-theme="light"] .hero-logo img:hover {
    filter: drop-shadow(0 12px 40px rgba(0, 0, 0, 0.18)) drop-shadow(0 0 30px rgba(0, 212, 255, 0.25));
}

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

@media (max-width: 768px) {
    .hero-logo img {
        width: 110px;
        height: 110px;
        border-radius: 22px;
    }
}

@media (max-width: 480px) {
    .hero-logo img {
        width: 90px;
        height: 90px;
        border-radius: 18px;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

[data-theme="light"] .hero-badge {
    background: rgba(255, 255, 255, 0.7);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #00ff88;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
    white-space: nowrap;
    max-width: 100%;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    border-color: var(--border-hover);
    background: var(--bg-glass);
}

[data-theme="light"] .btn-secondary {
    border-color: rgba(15, 23, 42, 0.2);
    background: #ffffff;
}

[data-theme="light"] .btn-secondary:hover {
    background: #f8fafc;
    border-color: var(--primary);
}

.btn-download {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.btn-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.15), transparent);
    transition: 0.5s;
}

.btn-download:hover::before {
    left: 100%;
}

.btn-download:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

@media (max-width: 480px) {
    .btn {
        padding: 12px 20px;
        font-size: 0.9375rem;
        white-space: normal;
    }
    
    .btn-large {
        padding: 14px 20px;
        font-size: 1rem;
    }
}

.btn-block {
    width: 100%;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 8px;
}

.hero-download-hint {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
    font-size: 0.8125rem;
    color: var(--text-muted);
    flex-wrap: wrap;
    justify-content: center;
    padding: 0 16px;
    text-align: center;
}

.os-badge {
    display: inline-block;
    padding: 3px 8px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.25);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

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

/* ========================================
   通用板块样式
   ======================================== */
section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

[data-theme="light"] .section-tag {
    background: rgba(0, 212, 255, 0.12);
    border-color: rgba(0, 212, 255, 0.3);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ========================================
   核心产品
   ======================================== */
.products {
    background: var(--bg-dark);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 24px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

@media (min-width: 769px) {
    .product-card {
        padding: 40px 32px;
    }
}

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

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

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

.product-card.featured {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, rgba(123, 44, 191, 0.08) 100%);
    border-color: rgba(0, 212, 255, 0.25);
}

[data-theme="light"] .product-card.featured {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.12) 0%, rgba(123, 44, 191, 0.08) 100%);
    border-color: rgba(0, 212, 255, 0.35);
}

.product-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--primary);
    margin-bottom: 24px;
}

.product-card h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 12px;
    word-break: break-word;
}

.product-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.card-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--primary-dark);
}

/* ========================================
   技术优势
   ======================================== */
.technology {
    background: var(--bg-deep);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
}

.tech-item {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: var(--transition);
}

.tech-item:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.tech-number {
    font-size: 3rem;
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1px var(--primary);
    line-height: 1;
    margin-bottom: 16px;
    opacity: 0.5;
    transition: var(--transition);
}

.tech-item:hover .tech-number {
    opacity: 1;
}

[data-theme="light"] .tech-number {
    -webkit-text-stroke: 1.5px var(--primary);
}

.tech-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.tech-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   解决方案
   ======================================== */
.solutions {
    background: var(--bg-dark);
}

.solutions-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-line {
    position: absolute;
    left: 40px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.solution-step {
    display: flex;
    gap: 32px;
    padding: 32px 0;
    position: relative;
}

.step-icon {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-deep);
    border: 2px solid var(--primary);
    border-radius: 50%;
    color: var(--primary);
    z-index: 1;
}

.step-content {
    padding-top: 8px;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    line-height: 1.7;
}

/* ========================================
   应用场景
   ======================================== */
.applications {
    background: var(--bg-deep);
}

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

.app-card {
    position: relative;
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.app-card:hover {
    transform: translateY(-8px);
    border-color: var(--app-color);
}

.app-bg {
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--app-color) 0%, transparent 70%);
    opacity: 0.08;
    transition: var(--transition);
}

.app-card:hover .app-bg {
    opacity: 0.15;
    top: -30%;
    right: -30%;
}

[data-theme="light"] .app-card:hover .app-bg {
    opacity: 0.22;
}

.app-card h3 {
    position: relative;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    z-index: 1;
    word-break: break-word;
}

.app-card p {
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    z-index: 1;
}

/* ========================================
   合作伙伴
   ======================================== */
.partners {
    background: var(--bg-dark);
}

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

.partner-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: var(--transition);
}

.partner-logo span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    text-align: center;
    padding: 0 8px;
}

.partner-logo:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

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

[data-theme="light"] .partner-logo:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

/* ========================================
   CTA区域
   ======================================== */
.cta-section {
    padding: 160px 0;
    position: relative;
    overflow: hidden;
}

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

#ctaCanvas {
    width: 100%;
    height: 100%;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
    padding: 0 16px;
}

.cta-content p {
    padding: 0 16px;
}

.cta-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.cta-sub-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 16px;
}

/* ========================================
   联系我们
   ======================================== */
.contact {
    background: var(--bg-deep);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 12px;
    color: var(--primary);
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

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

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 24px;
}

@media (min-width: 481px) {
    .contact-form {
        padding: 40px;
    }
}

[data-theme="light"] .contact-form {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 212, 255, 0.05);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
    background: #ffffff;
    border-color: var(--border);
}

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group textarea:focus {
    background: #ffffff;
}

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

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    padding: 64px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    max-width: 280px;
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.footer-icp {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.footer-icp a {
    color: var(--text-muted);
    transition: var(--transition);
}

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

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--primary);
    transform: translateY(-2px);
}

/* ========================================
   动画类 (AOS 模拟)
   ======================================== */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
    transform: translateX(0);
}

[data-aos="zoom-in"] {
    transform: scale(0.9);
}

[data-aos="zoom-in"].aos-animate {
    transform: scale(1);
}

/* 延迟 */
[data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos-delay="300"] { transition-delay: 0.3s; }
[data-aos-delay="400"] { transition-delay: 0.4s; }

.lang-transition,
.lang-transition * {
    transition: opacity 0.25s ease !important;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1100px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-card);
        flex-direction: column;
        padding: 80px 32px 32px;
        border-left: 1px solid var(--border);
        transition: var(--transition);
        gap: 24px;
        z-index: 999;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links .nav-download {
        width: 100%;
        text-align: center;
        background: rgba(0, 212, 255, 0.1);
    }
    
    .nav-actions {
        gap: 6px;
    }
    
    .lang-toggle,
    .theme-toggle {
        width: 36px;
        height: 36px;
    }
    
    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
        margin-left: 4px;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero-stats {
        gap: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .timeline-line {
        left: 24px;
    }
    
    .solution-step {
        gap: 20px;
    }
    
    .step-icon {
        width: 56px;
        height: 56px;
    }
    
    .step-icon svg {
        width: 24px;
        height: 24px;
    }
    
    section {
        padding: 80px 0;
    }
    
    .cta-section {
        padding: 100px 0;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(1.75rem, 8vw, 2.75rem);
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .apps-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        max-width: 280px;
    }
}