/* ============================================================
   GEO排名优化系统 - 前台首页样式（深色科技风）
   ============================================================ */

:root {
    --primary-color: #00f2ff;
    --secondary-color: #7b2cbf;
    --accent-color: #ff006e;
    --success-color: #00ff88;
    --bg-dark: #0a0e27;
    --bg-darker: #050818;
    --bg-card: #151937;
    --bg-card-hover: #1a1f42;
    --text-primary: #ffffff;
    --text-secondary: #a8b2d1;
    --text-muted: #6b7280;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 242, 255, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 242, 255, 0.15);
    --shadow-lg: 0 16px 48px rgba(0, 242, 255, 0.2);
    --gradient-primary: linear-gradient(135deg, #00f2ff 0%, #7b2cbf 100%);
    --gradient-secondary: linear-gradient(135deg, #ff006e 0%, #7b2cbf 100%);
    --gradient-accent: linear-gradient(135deg, #00ff88 0%, #00f2ff 100%);
    --radius: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--gradient-primary); border-radius: 3px; }

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

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

/* ===== 动态背景 ===== */
.site-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    background: radial-gradient(circle at 20% 20%, rgba(0, 242, 255, 0.08), transparent 60%);
}

.grid-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 242, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 242, 255, 0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

#particleCanvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, #00f2ff 0%, transparent 70%);
    top: 10%; left: 10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, #7b2cbf 0%, transparent 70%);
    top: 40%; right: 10%;
    animation-delay: 5s;
}

.orb-3 {
    width: 350px; height: 350px;
    background: radial-gradient(circle, #ff006e 0%, transparent 70%);
    bottom: 20%; left: 50%;
    animation-delay: 10s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(50px, -50px) scale(1.1); }
    66% { transform: translate(-50px, 50px) scale(0.9); }
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 14, 39, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    text-decoration: none;
    z-index: 1001;
}

.logo-icon {
    position: relative;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 10px;
    box-shadow: 0 4px 16px rgba(0, 242, 255, 0.3);
    color: white;
    font-size: 18px;
    font-weight: 800;
}

.logo-pulse {
    position: absolute;
    width: 100%; height: 100%;
    border-radius: 10px;
    background: var(--gradient-primary);
    opacity: 0.5;
    animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 0; }
}

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

.logo-suffix {
    font-size: 14px;
    vertical-align: super;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 28px;
    align-items: center;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

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

.nav-login {
    color: var(--accent-color) !important;
}

.nav-cta .btn-nav-cta {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(0, 242, 255, 0.3);
}

.btn-nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(8px, 8px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(8px, -8px); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 70px;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid rgba(0, 242, 255, 0.3);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 32px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 0 8px var(--primary-color);
    animation: dotPulse 1.5s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-size: clamp(40px, 7vw, 64px);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
}

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

.hero-description {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 15px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 242, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.arrow-icon {
    transition: transform 0.3s ease;
}

.btn-primary:hover .arrow-icon {
    transform: translateX(4px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 34px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 56px;
    background: var(--border-color);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-line {
    width: 2px;
    height: 36px;
    background: linear-gradient(to bottom, transparent, var(--primary-color));
}

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

/* ===== 通用 Section ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-alt {
    /*background: rgba(5, 8, 24, 0.5);*/
    /*backdrop-filter: blur(10px);*/
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid rgba(0, 242, 255, 0.3);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.tag-icon {
    font-size: 14px;
}

.section-title {
    font-size: clamp(32px, 4.5vw, 44px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 功能特色 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.feature-card {
    position: relative;
    padding: 36px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    cursor: pointer;
    overflow: hidden;
    text-align: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.feature-card:hover::before { opacity: 0.05; }

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

.feature-icon-wrapper {
    position: relative;
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
}

.feature-icon {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    font-size: 30px;
    color: white;
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.3);
}

.feature-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 100%; height: 100%;
    background: var(--gradient-primary);
    border-radius: 16px;
    filter: blur(20px);
    opacity: 0.4;
    z-index: -1;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 14px;
}

.feature-link {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover .feature-link {
    opacity: 1;
}

/* ===== AI 模型网格 ===== */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

.ai-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
    cursor: default;
}

.ai-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.ai-card .initial {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 18px;
    margin: 0 auto 14px;
}

.ai-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    object-fit: contain;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--border-color);
    margin: 0 auto 14px;
    display: block;
}

.ai-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.ai-card p {
    font-size: 12px;
    color: var(--text-muted);
}

.ai-card .badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    margin-top: 8px;
    background: rgba(0, 255, 136, 0.15);
    color: var(--success-color);
    font-weight: 500;
    border: 1px solid rgba(0, 255, 136, 0.3);
}

/* "更多接入中"卡片 */
.coming-soon-card {
    border: 1px dashed rgba(0, 242, 255, 0.3) !important;
    background: rgba(0, 242, 255, 0.03) !important;
    opacity: 0.7;
}
.coming-soon-card:hover {
    border-color: rgba(0, 242, 255, 0.5) !important;
    box-shadow: none !important;
    opacity: 1;
}
.coming-soon-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: 2px dashed rgba(0, 242, 255, 0.4);
    color: rgba(0, 242, 255, 0.5);
    font-size: 24px;
    font-weight: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    transition: var(--transition);
}
.coming-soon-card:hover .coming-soon-icon {
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.coming-soon-tag {
    border: 1px dashed rgba(0, 242, 255, 0.3) !important;
    background: rgba(0, 242, 255, 0.03) !important;
    opacity: 0.7;
}
.coming-soon-tag:hover {
    border-color: rgba(0, 242, 255, 0.5) !important;
    box-shadow: none !important;
    opacity: 1;
}

/* ===== 套餐定价 ===== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
    align-items: start;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 40px rgba(0, 242, 255, 0.15);
}

.pricing-card.featured .popular {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(0, 242, 255, 0.4);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
    transform: translateY(-8px);
}

.plan-name {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.plan-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.price {
    font-size: 40px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.price .unit {
    font-size: 18px;
    font-weight: 600;
}

.price-sub {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.features-list {
    list-style: none;
    margin-bottom: 28px;
}

.features-list li {
    padding: 10px 0;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
}

.features-list li:last-child { border-bottom: none; }

.features-list li .check {
    color: var(--success-color);
    font-weight: 700;
    font-size: 16px;
}

.btn-plan {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    display: block;
    text-decoration: none;
}

.btn-outline-plan {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
}

.btn-outline-plan:hover {
    background: var(--primary-color);
    color: var(--bg-dark);
}

.pricing-card.featured .btn-plan {
    background: var(--gradient-primary);
    color: white;
    border: none;
    box-shadow: 0 4px 20px rgba(0, 242, 255, 0.3);
}

.pricing-card.featured .btn-plan:hover {
    box-shadow: 0 8px 28px rgba(0, 242, 255, 0.5);
    transform: translateY(-2px);
}

/* ===== 发布平台 ===== */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
}

.platform-tag {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 28px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: default;
}

.platform-tag:hover {
    transform: translateY(-6px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.platform-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    object-fit: contain;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.platform-icon-fallback {
    font-size: 28px;
    line-height: 1;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.platform-tag .cat {
    font-size: 11px;
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid rgba(0, 242, 255, 0.2);
    padding: 2px 10px;
    border-radius: 10px;
    color: var(--primary-color);
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

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

.contact-card-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 28px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: var(--transition);
}

.contact-card-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.contact-icon-circle {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 24px;
    color: white;
    box-shadow: 0 4px 16px rgba(0, 242, 255, 0.2);
}

.contact-card-body h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.contact-value {
    display: inline-block;
    color: var(--primary-color);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    word-break: break-all;
}

.contact-card-body p {
    color: var(--text-muted);
    font-size: 13px;
}

.wechat-qr-wrap {
    margin: 10px 0;
}

.wechat-qr-img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    display: block;
}

/* 留言表单 */
.contact-form-side {
    position: sticky;
    top: 90px;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
}

.form-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.form-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 28px;
}

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
    font-family: inherit;
    background: rgba(10, 14, 39, 0.6);
}

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

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 242, 255, 0.1);
}

.form-group textarea {
    height: 110px;
    resize: vertical;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0, 242, 255, 0.3);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(0, 242, 255, 0.5);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== Footer ===== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px;
    background: rgba(5, 8, 24, 0.6);
    backdrop-filter: blur(10px);
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 64px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    font-size: 14px;
}

.social-links {
    display: flex;
    gap: 14px;
}

.social-link {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 18px;
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

.footer-column h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-column ul {
    list-style: none;
}

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

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 16px;
}

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

.footer-meta {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.3);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 242, 255, 0.4);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    top: 90px;
    right: 24px;
    z-index: 9999;
    padding: 14px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    color: white;
    transform: translateX(120%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    max-width: 360px;
    backdrop-filter: blur(10px);
}

.toast.show { transform: translateX(0); }
.toast.success { background: rgba(0, 255, 136, 0.9); }
.toast.error { background: rgba(255, 0, 110, 0.9); }
.toast.info { background: rgba(0, 242, 255, 0.9); color: var(--bg-dark); }

/* ===== Loading ===== */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    grid-column: 1 / -1;
}

.loading-spinner .spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== AOS 简化动画 ===== */
[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] { transform: translateY(30px); }
[data-aos="fade-up"].aos-animate { transform: translateY(0); }
[data-aos="fade-down"] { transform: translateY(-30px); }
[data-aos="fade-down"].aos-animate { transform: translateY(0); }
[data-aos="fade-left"] { transform: translateX(30px); }
[data-aos="fade-left"].aos-animate { transform: translateX(0); }
[data-aos="fade-right"] { transform: translateX(-30px); }
[data-aos="fade-right"].aos-animate { transform: translateX(0); }
[data-aos="zoom-in"] { transform: scale(0.9); }
[data-aos="zoom-in"].aos-animate { transform: scale(1); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .contact-form-side {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(10, 14, 39, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-cta {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

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

    .ai-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 14px;
    }

    .ai-icon, .ai-card .initial {
        width: 40px;
        height: 40px;
    }

    .platform-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 14px;
    }

    .platform-icon, .platform-icon-fallback {
        width: 42px;
        height: 42px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .section {
        padding: 70px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .contact-card-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .pricing-card {
        padding: 32px 24px;
    }

    .pricing-card.featured {
        transform: none;
    }

    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        gap: 16px;
    }

    .stat-number {
        font-size: 26px;
    }

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

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

    .feature-card {
        padding: 28px 20px;
    }

    .contact-form {
        padding: 28px 20px;
    }
}