/* ============================================
   校园AI智联平台 - 静态网站样式
   ============================================ */

/* CSS变量 */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --bg-dark-secondary: #1f2937;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    --gradient-dark: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 容器 */
.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;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 0.875rem;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-link {
    padding: 8px 16px;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* ============================================
   英雄区域
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--bg-dark);
    padding: 100px 24px;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary-color);
    top: -200px;
    right: -200px;
    animation: float 8s ease-in-out infinite;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary-color);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(10deg); }
}

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

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-title {
    margin-bottom: 24px;
}

.title-line {
    display: block;
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    line-height: 1.2;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    display: block;
    font-size: 1.5rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
}

.hero-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

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

.btn {
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   通用区域样式
   ============================================ */
.section {
    padding: 100px 0;
}

.section-dark {
    background: var(--bg-dark);
    color: white;
}

.section-dark .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.section-dark .section-badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--secondary-color);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-dark .section-title {
    color: white;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   统计网格
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.stat-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: var(--transition-fast);
}

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

.stat-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 1.25rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

.stat-source {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* 政策卡片 */
.policy-card {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1px solid #bae6fd;
    border-radius: 16px;
    padding: 32px;
}

.policy-card h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.policy-card h3 i {
    color: var(--primary-color);
}

.policy-list {
    list-style: none;
}

.policy-list li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(186, 230, 253, 0.5);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.policy-list li strong {
    color: var(--text-primary);
}

/* ============================================
   痛点分析
   ============================================ */
.painpoints-grid,
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.painpoint-card {
    padding: 24px;
    border-radius: 12px;
    transition: var(--transition-fast);
}

.painpoint-card.pain {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.painpoint-card.solution {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.painpoint-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.painpoint-card.pain .painpoint-icon {
    color: #ef4444;
}

.painpoint-card.solution .painpoint-icon {
    color: #10b981;
}

.painpoint-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: white;
}

.painpoint-card p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* ============================================
   产品介绍
   ============================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.product-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition-fast);
}

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

.product-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.product-card h3 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.product-card ul {
    list-style: none;
}

.product-card li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.product-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.tech-stack {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
}

.tech-stack h3 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.tech-tag {
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   竞品分析
   ============================================ */
.comparison-table {
    overflow-x: auto;
    margin-bottom: 48px;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.comparison-table th,
.comparison-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.comparison-table th {
    background: var(--bg-dark);
    color: white;
    font-weight: 600;
}

.comparison-table th.highlight {
    background: var(--primary-color);
}

.comparison-table td.highlight {
    background: rgba(99, 102, 241, 0.1);
    font-weight: 600;
    color: var(--primary-color);
}

.comparison-table i {
    margin-right: 4px;
}

.comparison-table .fa-check {
    color: var(--success-color);
}

.comparison-table .fa-times {
    color: var(--danger-color);
}

.moat-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 16px;
    padding: 32px;
}

.moat-card h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    margin-bottom: 24px;
    color: white;
}

.moat-card.bottom {
    margin-top: 48px;
}

.moat-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

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

.moat-number {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.moat-item i {
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.moat-item strong {
    display: block;
    margin-bottom: 4px;
    color: white;
}

.moat-item p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   商业模式
   ============================================ */
.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 32px;
}

.business-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.business-header {
    padding: 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.business-header h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.business-card.b2b .business-header {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.business-card.b2c .business-header {
    background: linear-gradient(135deg, #fdf4ff 0%, #fae8ff 100%);
}

.business-items {
    padding: 24px;
}

.business-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.business-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.business-item h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.business-item .price {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.business-item ul {
    list-style: none;
}

.business-item li {
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.business-item li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* ============================================
   团队介绍
   ============================================ */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.team-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: var(--transition-fast);
}

.team-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.team-card.founder {
    max-width: 400px;
    margin: 0 auto;
    background: rgba(99, 102, 241, 0.15);
    border: 2px solid rgba(99, 102, 241, 0.3);
}

.team-card.founder .team-avatar {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.4);
}

.team-card.founder .avatar-letter {
    font-size: 2rem;
}

.founder-note {
    max-width: 600px;
    margin: 24px auto 0;
    text-align: center;
}

.founder-note p {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50px;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.founder-note i {
    color: var(--secondary-color);
}

.team-avatar {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.avatar-letter {
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
}

.team-card h3 {
    font-size: 1.125rem;
    margin-bottom: 4px;
    color: white;
}

.team-role {
    font-size: 0.875rem;
    color: var(--secondary-color);
    margin-bottom: 16px;
}

.team-achievements {
    list-style: none;
    text-align: left;
    margin-bottom: 16px;
}

.team-achievements li {
    padding: 4px 0;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
}

.team-focus {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--accent-color);
    font-weight: 500;
}

.advisors-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
}

.advisors-card h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.125rem;
    margin-bottom: 20px;
    color: white;
}

.advisors-list {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.advisor-item {
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

.culture-card {
    background: rgba(99, 102, 241, 0.2);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.culture-card h4 {
    font-size: 0.875rem;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.culture-card p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   技术架构
   ============================================ */
.architecture-layers {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.arch-layer {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-fast);
}

.arch-layer:hover {
    box-shadow: var(--shadow-lg);
}

.layer-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.layer-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.layer-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.layer-content {
    padding: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.arch-item {
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   实施路线图
   ============================================ */
.roadmap-timeline {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.roadmap-phase {
    position: relative;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.phase-badge {
    padding: 8px 20px;
    background: var(--primary-color);
    color: white;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
}

.phase-time {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

.phase-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.phase-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 20px;
}

.phase-item .month {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.3);
    color: var(--secondary-color);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.phase-item h4 {
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: white;
}

.phase-item p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* ============================================
   市场推广策略
   ============================================ */
.marketing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.marketing-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition-fast);
}

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

.marketing-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    margin-bottom: 20px;
}

.marketing-card h3 {
    font-size: 1.125rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.marketing-card ul {
    list-style: none;
}

.marketing-card li {
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.marketing-card li:last-child {
    border-bottom: none;
}

.marketing-card li strong {
    color: var(--text-primary);
}

.metrics-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
}

.metrics-card h3 {
    text-align: center;
    font-size: 1.125rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.metric-item {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ============================================
   财务预测
   ============================================ */
.financial-timeline {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.financial-year {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    min-width: 200px;
    transition: var(--transition-fast);
}

.financial-year:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.year-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-color);
    color: white;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.year-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 8px;
}

.year-desc {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

.financial-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 32px;
}

.revenue-card,
.cost-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
}

.revenue-card h3,
.cost-card h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.125rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.revenue-card h3 i,
.cost-card h3 i {
    color: var(--primary-color);
}

.revenue-card table {
    width: 100%;
    border-collapse: collapse;
}

.revenue-card th,
.revenue-card td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.revenue-card th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.revenue-card td {
    color: var(--text-secondary);
}

.cost-items {
    margin-bottom: 24px;
}

.cost-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.cost-item:last-child {
    border-bottom: none;
}

.cost-name {
    font-weight: 500;
    color: var(--text-primary);
}

.cost-value {
    font-weight: 600;
    color: var(--primary-color);
}

.cost-desc {
    grid-column: 1 / -1;
    font-size: 0.8rem;
    color: var(--text-light);
}

.profit-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

.profit-item {
    text-align: center;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.profit-item.highlight {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
}

.profit-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

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

/* ============================================
   风险评估
   ============================================ */
.risk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.risk-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: var(--transition-fast);
}

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

.risk-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.risk-header h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
}

.risk-level {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
}

.risk-card.high .risk-level {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.risk-card.medium .risk-level {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.risk-card.low .risk-level {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.risk-items {
    list-style: none;
    margin-bottom: 16px;
}

.risk-items li {
    padding: 8px 0;
    padding-left: 16px;
    position: relative;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.risk-items li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--danger-color);
}

.risk-solutions {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 16px;
}

.risk-solutions p {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.risk-solutions i {
    color: var(--success-color);
}

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 48px;
}

.contact-info,
.contact-details {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
}

.contact-info h3,
.contact-details h3 {
    font-size: 1.25rem;
    margin-bottom: 24px;
    color: white;
}

.funding-list {
    list-style: none;
}

.funding-list li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

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

.funding-list li strong {
    color: var(--secondary-color);
}

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

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

.contact-item i {
    width: 48px;
    height: 48px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    font-size: 1.125rem;
}

.contact-item strong {
    display: block;
    margin-bottom: 4px;
    color: white;
}

.contact-item p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 0;
}

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

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 0.875rem;
}

.footer-logo .logo-text {
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
}

.footer-text {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
}

.footer-text:last-child {
    margin-bottom: 0;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .title-line {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: 32px;
    }

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

    .financial-details {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 20px;
    }

    .title-line {
        font-size: 2rem;
    }

    .title-sub {
        font-size: 1.125rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

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

    .btn {
        width: 100%;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

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

    .painpoints-grid,
    .solutions-grid {
        grid-template-columns: 1fr;
    }

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

    .comparison-table {
        font-size: 0.75rem;
    }

    .moat-items {
        grid-template-columns: 1fr;
    }

    .team-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .phase-content {
        grid-template-columns: 1fr;
    }

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

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

    .financial-timeline {
        flex-direction: column;
    }

    .financial-year {
        width: 100%;
    }

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .title-line {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .year-value {
        font-size: 2rem;
    }

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

    .profit-summary {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   动画效果
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 平滑滚动锚点偏移 */
section[id] {
    scroll-margin-top: 80px;
}