/* ==========================================================================
   Thirteen.AI - 核心样式设计系统 (时尚与科技融合)
   ========================================================================== */

/* 变量声明 */
:root {
    --bg-dark: #07090e;
    --bg-card: rgba(22, 30, 49, 0.65);
    --bg-card-hover: rgba(28, 38, 62, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(161, 136, 248, 0.4);
    
    --primary: #a188f8;
    --secondary: #ff758c;
    --accent: #00f2fe;
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-dark: #1f2937;
    --success: #34d399;
    --danger: #f87171;
    
    --font-primary: 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.2s ease;
    
    --glow-primary: 0 0 30px rgba(161, 136, 248, 0.3);
    --glow-secondary: 0 0 30px rgba(255, 117, 140, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-dark);
    color: var(--text-main);
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul, ol {
    list-style: none;
}

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

/* 工具类 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

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

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

.text-gradient-alt {
    background: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

.highlight {
    color: var(--secondary);
}

.highlight-border {
    position: relative;
    border: 1px solid var(--border-color);
}

.highlight-border::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px; right: -1px; bottom: -1px;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(161, 136, 248, 0.5) 0%, rgba(255, 117, 140, 0.5) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    box-shadow: 0 4px 20px rgba(161, 136, 248, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(161, 136, 248, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--bg-dark);
    box-shadow: 0 0 15px rgba(161, 136, 248, 0.4);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(7, 9, 14, 0.7);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    padding: 14px 0;
    background: rgba(7, 9, 14, 0.9);
}

.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;
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.logo-icon {
    font-size: 1.3rem;
    margin-right: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rotateGlow 6s linear infinite;
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    position: relative;
    padding: 8px 0;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-main);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: var(--transition-smooth);
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--text-main);
    transition: var(--transition-smooth);
}

/* 背景光晕 */
.glow-container {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.glow-ball {
    position: absolute;
    border-radius: 50%;
    filter: blur(150px);
    opacity: 0.15;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    left: -100px;
    animation: floatBall 20s infinite alternate;
}

.glow-2 {
    width: 500px;
    height: 500px;
    background: var(--secondary);
    bottom: -150px;
    right: -100px;
    animation: floatBall 15s infinite alternate-reverse;
}

/* 视觉首屏 (Hero Section) */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 140px;
    padding-bottom: 60px;
    background: radial-gradient(circle at 50% 30%, rgba(22, 30, 49, 0.3) 0%, rgba(7, 9, 14, 1) 70%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 850px;
}

.tagline-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--secondary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--secondary);
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    font-weight: 300;
    line-height: 1.7;
    margin-bottom: 40px;
}

.hero-subtitle strong {
    color: var(--text-main);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin-top: 40px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    backdrop-filter: blur(16px);
    box-shadow: var(--glass-shadow);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-num {
    font-size: 2.2rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    background: linear-gradient(135deg, #fff, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

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

/* 通用板块头部 */
.section-header {
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* 效能对比 (Comparison Section) */
.comparison-section {
    position: relative;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: stretch;
}

.comp-card {
    padding: 48px;
    border-radius: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(16px);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.comp-card:hover {
    transform: translateY(-5px);
    background: var(--bg-card-hover);
    box-shadow: var(--glass-shadow);
}

.card-pain {
    border-top: 4px solid var(--danger);
}

.card-benefit {
    border-top: 4px solid var(--success);
}

.card-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.card-icon {
    font-size: 2rem;
    font-weight: 800;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.card-pain .card-icon {
    background: rgba(248, 113, 113, 0.1);
    color: var(--danger);
}

.card-benefit .card-icon {
    background: rgba(52, 211, 153, 0.1);
    color: var(--success);
}

.comp-card h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-intro {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.comp-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.comp-list li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.list-bullet {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 8px;
    flex-shrink: 0;
}

.card-pain .list-bullet {
    background-color: var(--danger);
}

.card-benefit .list-bullet {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.comp-list li strong {
    display: block;
    font-size: 1.05rem;
    color: var(--text-main);
    margin-bottom: 4px;
}

.comp-list li span {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* 自动化架构 (Architecture Section) */
.workflow-container {
    margin-top: 40px;
}

.workflow-grid {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.workflow-step-card {
    flex: 1;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    backdrop-filter: blur(16px);
    transition: var(--transition-smooth);
    position: relative;
}

.workflow-step-card:hover,
.workflow-step-card.active-card {
    background: var(--bg-card-hover);
    transform: translateY(-8px);
}

.workflow-step-card.active-card {
    border: 1px solid var(--primary);
    box-shadow: var(--glow-primary);
}

.step-num {
    font-size: 3rem;
    font-weight: 900;
    font-family: 'Outfit', sans-serif;
    opacity: 0.15;
    position: absolute;
    top: 15px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.workflow-step-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.step-summary {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 24px;
}

.step-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.step-features span {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-muted);
}

.workflow-step-card.active-card .step-features span {
    border: 1px solid rgba(161, 136, 248, 0.3);
    color: var(--primary);
}

.workflow-arrow {
    width: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.arrow-svg {
    width: 100%;
    overflow: visible;
}

.arrow-svg path {
    animation: drawLine 2s linear infinite;
}

/* 账号矩阵策略 (Strategy Section) */
.strategy-tabs-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 32px;
    padding: 32px;
    backdrop-filter: blur(16px);
}

.tabs-nav {
    display: flex;
    justify-content: space-between;
    background: rgba(0, 0, 0, 0.2);
    padding: 6px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.tab-btn {
    flex: 1;
    padding: 14px;
    font-size: 0.95rem;
    font-weight: 600;
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(161, 136, 248, 0.3);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-panel.active {
    display: block;
}

.panel-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.panel-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(161, 136, 248, 0.1);
    color: var(--primary);
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.panel-info h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.panel-desc {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 24px;
}

.panel-bullets {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel-bullets li {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.panel-bullets li strong {
    color: var(--text-main);
}

.panel-mockup {
    background: #0f131d;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--glass-shadow);
}

.mockup-header {
    background: #171d2c;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.mockup-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.mockup-body {
    padding: 16px;
}

.mockup-img {
    border-radius: 12px;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: #fff;
    margin-bottom: 16px;
}

.placeholder-style-1 {
    background: linear-gradient(135deg, #1c2e4a 0%, #0d1624 100%);
}

.placeholder-style-2 {
    background: linear-gradient(135deg, #38203f 0%, #170d1a 100%);
}

.placeholder-style-3 {
    background: linear-gradient(135deg, #16362b 0%, #0a1b15 100%);
}

.placeholder-style-4 {
    background: linear-gradient(135deg, #3e2f1e 0%, #1e160e 100%);
}

.placeholder-style-5 {
    background: linear-gradient(135deg, #2b2b2b 0%, #111111 100%);
}

.mockup-img-inner {
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 8px;
    backdrop-filter: blur(5px);
}

.mockup-text p {
    line-height: 1.5;
}

.mockup-post-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.mockup-post-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.mockup-cart-badge {
    background: rgba(255, 117, 140, 0.1);
    border: 1px dashed var(--secondary);
    color: var(--secondary);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
}

/* 效益估算 (ROI Section) */
.roi-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 40px;
    align-items: stretch;
}

.roi-calculator {
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 32px;
    backdrop-filter: blur(16px);
}

.calc-header {
    margin-bottom: 32px;
}

.calc-header h4 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.calc-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.control-group {
    margin-bottom: 28px;
}

.control-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.control-val {
    color: var(--primary);
    font-weight: 700;
}

input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.05);
    height: 6px;
    border-radius: 5px;
    outline: none;
    margin-bottom: 8px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    cursor: pointer;
    box-shadow: 0 0 10px rgba(161, 136, 248, 0.5);
    transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.roi-results {
    padding: 40px;
    background: linear-gradient(135deg, rgba(22, 30, 49, 0.4) 0%, rgba(15, 20, 35, 0.7) 100%);
    border-radius: 32px;
    backdrop-filter: blur(16px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.results-header {
    margin-bottom: 30px;
}

.results-header h4 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.results-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 30px;
}

.result-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 16px;
}

.result-card.highlight-card {
    background: rgba(161, 136, 248, 0.03);
}

.result-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    line-height: 1.2;
}

.result-unit {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    display: block;
}

.results-footer {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.disclaimer {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* 合作模式与分工 (Partnership Section) */
.partnership-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 48px;
}

.partner-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 32px;
    padding: 48px;
    backdrop-filter: blur(16px);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.partner-card:hover {
    transform: translateY(-5px);
    background: var(--bg-card-hover);
    box-shadow: var(--glass-shadow);
}

.card-glow {
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(255,117,140,0.03) 0%, transparent 60%);
    pointer-events: none;
}

.card-glow.animate-glow {
    background: radial-gradient(circle, rgba(161,136,248,0.05) 0%, transparent 60%);
    animation: rotateGlow 15s linear infinite;
}

.role-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.role-tag.highlight {
    background: rgba(161, 136, 248, 0.15);
    border: 1px solid rgba(161, 136, 248, 0.3);
    color: var(--primary);
}

.partner-card h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 32px;
}

.role-list {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.role-list li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.role-icon {
    font-size: 1.5rem;
    line-height: 1;
    margin-top: 4px;
}

.role-list li strong {
    display: block;
    font-size: 1.05rem;
    color: var(--text-main);
    margin-bottom: 4px;
}

.role-list li span {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* 分润细则 */
.pricing-detail {
    background: var(--bg-card);
    border-radius: 32px;
    padding: 48px;
    backdrop-filter: blur(16px);
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 40px;
}

.pricing-info h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.pricing-info p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-badges {
    display: flex;
    gap: 16px;
}

.pricing-badges span {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 700;
}

.pricing-split {
    display: flex;
    align-items: center;
    gap: 32px;
}

.split-circle-container {
    position: relative;
    width: 120px;
    height: 120px;
}

.split-pie {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.pie-bg {
    fill: none;
    stroke: var(--secondary);
    stroke-width: 20;
}

.pie-segment {
    fill: none;
    stroke: var(--primary);
    stroke-width: 20;
}

.split-center {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.split-percent {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.split-text {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.split-legend {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.ours {
    background-color: var(--secondary);
}

.legend-dot.mine {
    background-color: var(--primary);
}

.pricing-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* 常见问题 (FAQ Section) */
.faq-accordion {
    max-width: 850px;
    margin: 0 auto;
}

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

.faq-question {
    width: 100%;
    padding: 24px 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 1.15rem;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition-fast);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-answer p {
    padding-bottom: 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--secondary);
}

/* 联系模态框 (Contact Modal) */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2000;
    background: rgba(7, 9, 14, 0.85);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: #0f1422;
    padding: 40px;
    border-radius: 28px;
    width: 100%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    animation: scaleUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-content h3 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.modal-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 14px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--border-focus);
}

.form-group select option {
    background: #0f1422;
    color: var(--text-main);
}

/* 底部 (Footer) */
.footer {
    background: #040508;
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.footer-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.footer-divider {
    height: 1px;
    background-color: var(--border-color);
    max-width: 600px;
    margin: 0 auto 30px;
}

.copyright {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   动画声明
   ========================================================================== */
@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 12px var(--secondary); }
    100% { transform: scale(1); opacity: 0.8; }
}

@keyframes floatBall {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(100px, 80px) scale(1.1); }
    100% { transform: translate(-50px, -50px) scale(0.9); }
}

@keyframes rotateGlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes drawLine {
    0% { stroke-dashoffset: 24; }
    100% { stroke-dashoffset: 0; }
}

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

@keyframes scaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* 滚动入场动效类 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.appear {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.2rem;
    }
    
    .comparison-grid,
    .roi-grid,
    .partnership-cards,
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .pricing-split {
        justify-content: center;
    }
    
    .panel-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .panel-mockup {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .workflow-grid {
        flex-direction: column;
        gap: 30px;
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
        height: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links, .nav-cta {
        display: none; /* 简化移动端，此处用JS展示抽屉式菜单 */
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .stat-divider {
        width: 60px;
        height: 1px;
    }
    
    .tabs-nav {
        flex-wrap: wrap;
        gap: 8px;
        background: transparent;
        border: none;
    }
    
    .tab-btn {
        flex: unset;
        width: calc(50% - 4px);
        background: rgba(255,255,255,0.02);
        border: 1px solid var(--border-color);
        border-radius: 8px;
    }
    
    .tab-btn.active {
        box-shadow: none;
    }
    
    .section-padding {
        padding: 60px 0;
    }
    
    .comp-card, .roi-calculator, .roi-results, .partner-card, .pricing-detail {
        padding: 24px;
    }
}