/* ============================================
   Kindyroo 蛇球实验室 - 全局样式表
   高端品牌感 + 运动科技感 + 深色配色
   ============================================ */

/* 重置与全局变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0f172a;
    --secondary: #1e293b;
    --accent: #2563eb;
    --accent-light: #60a5fa;
    --accent-dark: #1d4ed8;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --bg-light: #0f172a;
    --bg-darker: #020617;
    --border: #334155;
    --border-light: #475569;
    --success: #10b981;
    --warning: #f59e0b;
    --highlight: #fbbf24;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.5);
    --shadow-xl: 0 25px 50px rgba(0,0,0,0.6);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', 'Noto Sans CJK SC', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 段落标题 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo-icon {
    font-size: 1.8rem;
    animation: pulse-icon 2s ease-in-out infinite;
}

@keyframes pulse-icon {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.logo-text {
    display: inline-block;
}

.logo-sub {
    font-size: 0.7rem;
    color: var(--accent-light);
    display: block;
    font-weight: 600;
}

.logo:hover {
    color: var(--accent-light);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent-light);
}

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

.nav-link.cta-link {
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: var(--radius-sm);
    color: white;
}

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

.nav-link.cta-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(59, 130, 246, 0.3);
}

@media (max-width: 768px) {
    .navbar {
        height: 60px;
    }

    .nav-menu {
        gap: 20px;
        font-size: 0.85rem;
    }

    .logo {
        font-size: 1.1rem;
    }
}

/* ============================================
   Hero 首屏
   ============================================ */
.hero {
    margin-top: 70px;
    padding: 80px 0 100px;
    min-height: calc(100vh - 70px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 15% 40%, rgba(37,99,235,0.12) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(96,165,250,0.08) 0%, transparent 45%);
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: rgba(37, 99, 235, 0.15);
    border: 1px solid rgba(37, 99, 235, 0.35);
    border-radius: 24px;
    color: var(--accent-light);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 25px;
    transition: var(--transition-fast);
}

.hero-label:hover {
    background: rgba(37, 99, 235, 0.25);
    border-color: rgba(37, 99, 235, 0.5);
}

.hero-title {
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    color: var(--text-primary);
    letter-spacing: -1.5px;
}

.hero-title .highlight {
    background: linear-gradient(120deg, var(--accent) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 35px;
    line-height: 1.8;
    font-weight: 400;
    max-width: 480px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 45px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 500px;
}

.stat-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: rgba(37, 99, 235, 0.08);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.stat-item:hover {
    background: rgba(37, 99, 235, 0.15);
}

.stat-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
}

.stat-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}


/* 按钮样式 */
.btn {
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    white-space: nowrap;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 100%);
    color: white;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent-light);
    border: 2px solid var(--accent-light);
}

.btn-secondary:hover {
    background: rgba(37, 99, 235, 0.2);
    color: var(--text-primary);
    border-color: var(--text-primary);
}

/* Hero 右侧视觉 */
.hero-visual {
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    aspect-ratio: 1 / 1.15;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.hero-image-wrapper:hover .hero-image {
    transform: scale(1.08);
}

.hero-accent {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.2) 0%, transparent 100%);
    pointer-events: none;
    border-radius: var(--radius-lg);
}

.image-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    padding: 12px 20px;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(37, 99, 235, 0.4);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

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

.hero-scroll-hint {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: bounce-icon 2s ease-in-out infinite;
}

.hero-scroll-hint svg {
    width: 24px;
    height: 24px;
}

@keyframes bounce-icon {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 40px 20px;
    }

    .hero {
        padding: 60px 0;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

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

    .btn {
        width: 100%;
    }
}

/* ============================================
   品牌定位模块
   ============================================ */
.brand-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(15,23,42,0.5) 0%, rgba(30,41,59,0.3) 100%);
    border-top: 1px solid rgba(37, 99, 235, 0.15);
    border-bottom: 1px solid rgba(37, 99, 235, 0.15);
}

.brand-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto 80px;
    padding: 0 20px;
}

.brand-intro-text h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--accent-light);
}

.brand-intro-text p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.brand-intro-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.intro-image {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.brand-intro-image:hover .intro-image {
    transform: scale(1.05);
}

.brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.brand-card {
    padding: 40px;
    background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(96,165,250,0.05) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    text-align: center;
}

.brand-card:hover {
    border-color: rgba(59, 130, 246, 0.5);
    background: linear-gradient(135deg, rgba(59,130,246,0.15) 0%, rgba(96,165,250,0.1) 100%);
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.brand-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.brand-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ============================================
   蛇球定义与原理模块
   ============================================ */
.definition-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(30,41,59,0.3) 0%, rgba(15,23,42,0.5) 100%);
}

.definition-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.definition-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 0;
    color: var(--accent-light);
    margin-bottom: 15px;
}

.definition-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.definition-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.feature-list {
    list-style: none;
    margin: 20px 0;
}

.feature-list li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.feature-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-light);
    font-weight: bold;
    font-size: 1.2rem;
}

.definition-visual {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.visual-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.definition-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.image-caption {
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    font-style: italic;
}

.fact-box {
    display: flex;
    gap: 15px;
    padding: 25px;
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.12) 0%, rgba(37, 99, 235, 0.08) 100%);
    border-left: 4px solid var(--highlight);
    border-radius: var(--radius-md);
    margin-top: 30px;
}

.fact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.fact-box strong {
    color: var(--text-primary);
}

.fact-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0;
}

.principle-flow {
    display: flex;
    align-items: center;
    gap: 0;
    justify-content: space-between;
    padding: 30px 0;
}

.flow-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.flow-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
}

.flow-item span {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-align: center;
}

@media (max-width: 768px) {
    .definition-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .principle-cards {
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
    }

    .principle-item {
        padding: 15px 10px;
    }
}

/* ============================================
   技术拆解模块
   ============================================ */
.tech-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(15,23,42,0.5) 0%, rgba(30,41,59,0.3) 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.tech-card {
    padding: 0;
    background: linear-gradient(135deg, rgba(30,41,59,0.6) 0%, rgba(37,99,235,0.08) 100%);
    border: 1px solid rgba(37, 99, 235, 0.25);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.tech-card:hover {
    background: linear-gradient(135deg, rgba(37,99,235,0.15) 0%, rgba(96,165,250,0.1) 100%);
    border-color: rgba(37, 99, 235, 0.5);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.tech-card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    transition: var(--transition);
}

.tech-card:hover .tech-card-image {
    transform: scale(1.05);
}

.tech-icon {
    font-size: 2.2rem;
    display: block;
    margin: 25px 0 15px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 20px 12px;
    color: var(--accent-light);
}

.tech-card p {
    padding: 0 20px 25px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   对比模块
   ============================================ */
.comparison-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(30,41,59,0.3) 0%, rgba(15,23,42,0.5) 100%);
}

.comparison-table {
    background: linear-gradient(135deg, rgba(59,130,246,0.08) 0%, rgba(30,41,59,0.6) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    max-width: 1200px;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
}

.comparison-row {
    display: grid;
    grid-template-columns: 200px 1fr 1fr;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    min-height: 80px;
    align-items: center;
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-header {
    padding: 25px 30px;
    font-weight: 700;
    color: var(--accent-light);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(59, 130, 246, 0.12);
    border-right: 1px solid rgba(59, 130, 246, 0.1);
}

.comparison-label {
    padding: 25px 30px;
    font-weight: 700;
    color: var(--accent-light);
    border-right: 1px solid rgba(59, 130, 246, 0.1);
    background: rgba(59, 130, 246, 0.08);
}

.comparison-cell {
    padding: 25px 30px;
    color: var(--text-secondary);
    line-height: 1.6;
    border-right: 1px solid rgba(59, 130, 246, 0.1);
    font-size: 0.9rem;
}

.comparison-cell:last-child {
    border-right: none;
}

@media (max-width: 1024px) {
    .comparison-row {
        grid-template-columns: 150px 1fr 1fr;
    }

    .comparison-header,
    .comparison-label,
    .comparison-cell {
        padding: 15px 20px;
    }
}

@media (max-width: 768px) {
    .comparison-row {
        grid-template-columns: 1fr;
        border-bottom: 2px solid rgba(59, 130, 246, 0.2);
    }

    .comparison-header {
        display: none;
    }

    .comparison-label {
        font-size: 0.85rem;
        border-right: none;
        border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    }

    .comparison-cell {
        border-right: none;
        padding: 10px 20px;
    }

    .comparison-cell::before {
        content: attr(data-label);
        display: block;
        font-weight: 700;
        color: var(--accent-light);
        margin-bottom: 5px;
    }
}

/* ============================================
   训练路径模块
   ============================================ */
.training-path-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(15,23,42,0.5) 0%, rgba(30,41,59,0.3) 100%);
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-light) 50%, var(--accent) 100%);
    top: 0;
}

.timeline-item {
    margin-bottom: 50px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.timeline-item:nth-child(odd) {
    text-align: right;
}

.timeline-item:nth-child(odd) .timeline-marker {
    margin-left: auto;
}

.timeline-item:nth-child(even) {
    text-align: left;
}

.timeline-item:nth-child(even) .timeline-marker {
    margin-right: auto;
}

.timeline-marker {
    position: relative;
    width: 110px;
    height: 110px;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 10;
    gap: 2px;
}

.marker-number {
    text-align: center;
    color: white;
    font-weight: 800;
    font-size: 1.8rem;
    line-height: 1;
}

.marker-phase {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}

.timeline-content {
    padding: 35px;
    background: linear-gradient(135deg, rgba(37,99,235,0.1) 0%, rgba(30,41,59,0.6) 100%);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.timeline-content:hover {
    background: linear-gradient(135deg, rgba(37,99,235,0.15) 0%, rgba(37,99,235,0.08) 100%);
    border-color: rgba(37, 99, 235, 0.4);
}

.timeline-content h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--accent-light);
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 18px;
    font-size: 0.95rem;
}

.timeline-goal {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px;
    background: rgba(16, 185, 129, 0.15);
    border-left: 3px solid var(--success);
    border-radius: 4px;
    color: var(--success);
    font-size: 0.85rem;
    font-weight: 600;
}

@media (max-width: 1024px) {
    .timeline::before {
        left: 30px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: 20px;
        text-align: left !important;
    }

    .timeline-marker {
        margin-left: 0 !important;
        margin-right: 0 !important;
        width: 100px;
        height: 100px;
    }

    .marker-number {
        font-size: 0.85rem;
    }
}

/* ============================================
   器材建议模块
   ============================================ */
.equipment-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(30,41,59,0.3) 0%, rgba(15,23,42,0.5) 100%);
}

.equipment-intro {
    max-width: 1200px;
    margin: 0 auto 60px;
    padding: 0 20px;
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    text-align: center;
    max-width: 700px;
}

.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.equipment-card {
    padding: 0;
    background: linear-gradient(135deg, rgba(30,41,59,0.6) 0%, rgba(37,99,235,0.08) 100%);
    border: 1px solid rgba(37, 99, 235, 0.25);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.equipment-card:hover {
    background: linear-gradient(135deg, rgba(37,99,235,0.15) 0%, rgba(96,165,250,0.1) 100%);
    border-color: rgba(37, 99, 235, 0.5);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.equipment-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

.equipment-card:hover .equipment-image {
    transform: scale(1.08);
}

.equipment-icon {
    font-size: 3rem;
    display: block;
    margin: 30px 0 20px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.equipment-card h3 {
    font-size: 1.2rem;
    font-weight: 800;
    margin: 0 25px;
    color: var(--accent-light);
}

.equipment-card > p {
    padding: 0 25px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9rem;
    margin: 12px 0 0;
}

.equipment-spec {
    padding: 20px 25px 25px;
    background: rgba(37, 99, 235, 0.08);
    border-top: 1px solid rgba(37, 99, 235, 0.15);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.equipment-spec div {
    padding: 4px 0;
}

/* ============================================
   数据指标模块
   ============================================ */
.metrics-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(15,23,42,0.5) 0%, rgba(30,41,59,0.3) 100%);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.metric-card {
    padding: 40px;
    background: linear-gradient(135deg, rgba(59,130,246,0.12) 0%, rgba(30,41,59,0.7) 100%);
    border: 2px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(96,165,250,0.05) 0%, transparent 100%);
    pointer-events: none;
}

.metric-card:hover {
    border-color: rgba(59, 130, 246, 0.6);
    background: linear-gradient(135deg, rgba(59,130,246,0.2) 0%, rgba(30,41,59,0.8) 100%);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.metric-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.metric-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--accent-light);
}

.metric-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 15px;
}

.metric-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.85rem;
}

/* ============================================
   FAQ 模块
   ============================================ */
.faq-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(30,41,59,0.3) 0%, rgba(15,23,42,0.5) 100%);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: linear-gradient(135deg, rgba(30,41,59,0.4) 0%, rgba(59,130,246,0.05) 100%);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 25px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: var(--transition);
    background: linear-gradient(90deg, transparent 0%, rgba(59,130,246,0.05) 100%);
}

.faq-item.active .faq-question {
    background: linear-gradient(90deg, transparent 0%, rgba(59,130,246,0.12) 100%);
}

.faq-question:hover {
    background: linear-gradient(90deg, transparent 0%, rgba(59,130,246,0.1) 100%);
}

.faq-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 50%;
    color: var(--accent-light);
    font-weight: bold;
    flex-shrink: 0;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    background: rgba(59, 130, 246, 0.3);
    transform: rotate(45deg);
}

.faq-question h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.faq-question h3:hover {
    color: var(--accent-light);
}

.faq-answer {
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(37, 99, 235, 0.05);
    max-height: 0;
}

.faq-item.active .faq-answer {
    padding: 25px;
    border-top: 1px solid rgba(37, 99, 235, 0.2);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
    font-size: 0.95rem;
}

.faq-answer p + p {
    margin-top: 15px;
}

/* ============================================
   联系模块
   ============================================ */
.contact-section {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(15,23,42,0.5) 0%, rgba(30,41,59,0.3) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    margin-bottom: 60px;
}

.contact-card {
    padding: 35px;
    text-align: center;
    background: linear-gradient(135deg, rgba(59,130,246,0.1) 0%, rgba(30,41,59,0.6) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.contact-card:hover {
    border-color: rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, rgba(59,130,246,0.15) 0%, rgba(96,165,250,0.08) 100%);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
}

.contact-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--accent-light);
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.contact-link {
    display: inline-block;
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    padding: 8px 15px;
}

.contact-link:hover {
    color: var(--text-primary);
    transform: translateX(5px);
}

.cta-box {
    background: linear-gradient(135deg, rgba(59,130,246,0.15) 0%, rgba(96,165,250,0.08) 100%);
    border: 2px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-box h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.cta-box p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.7;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: linear-gradient(180deg, rgba(2,6,23,0.9) 0%, rgba(15,23,42,0.95) 100%);
    border-top: 1px solid rgba(59, 130, 246, 0.15);
    padding: 60px 0 30px;
    color: var(--text-secondary);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-section p {
    line-height: 1.7;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: var(--accent-light);
}

.footer-bottom {
    border-top: 1px solid rgba(59, 130, 246, 0.1);
    padding-top: 30px;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .brand-intro {
        grid-template-columns: 1fr;
        gap: 40px;
        margin-bottom: 60px;
    }

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

    .timeline::before {
        left: 30px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2.2rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn {
        width: 100%;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .brand-grid,
    .tech-grid,
    .metrics-grid,
    .equipment-grid {
        grid-template-columns: 1fr;
    }

    .brand-intro {
        grid-template-columns: 1fr;
        margin-bottom: 40px;
    }

    .definition-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .definition-visual {
        gap: 20px;
    }

    .principle-flow {
        flex-wrap: wrap;
        padding: 20px 0;
        gap: 16px;
    }

    .flow-item {
        flex: 0 0 calc(50% - 8px);
    }

    .faq-section {
        padding: 60px 0;
    }

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

    .cta-box {
        padding: 40px 30px;
    }

    .cta-box h3 {
        font-size: 1.5rem;
    }

    .timeline {
        padding: 0 40px 0 70px;
    }

    .timeline::before {
        left: 30px;
    }

    .timeline-marker {
        width: 100px;
        height: 100px;
    }

    .marker-number {
        font-size: 1.5rem;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        margin-bottom: 40px;
    }

    .timeline-content {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .navbar {
        height: 50px;
    }

    .nav-menu {
        gap: 0;
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 40px 0 60px;
        margin-top: 50px;
    }

    .hero-label {
        font-size: 0.7rem;
        padding: 8px 12px;
    }

    .hero-title {
        font-size: 1.8rem;
        line-height: 1.2;
        margin-bottom: 15px;
    }

    .hero-desc {
        font-size: 0.9rem;
        margin-bottom: 25px;
    }

    .hero-stats {
        gap: 12px;
        margin-bottom: 20px;
    }

    .stat-item {
        padding: 12px;
        gap: 10px;
    }

    .stat-icon {
        font-size: 1.4rem;
    }

    .stat-value {
        font-size: 1.2rem;
    }

    .stat-text {
        font-size: 0.65rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

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

    .brand-intro {
        margin-bottom: 30px;
    }

    .timeline {
        padding: 0 40px 0 60px;
    }

    .timeline::before {
        left: 20px;
        width: 2px;
    }

    .timeline-marker {
        width: 90px;
        height: 90px;
    }

    .marker-number {
        font-size: 1.3rem;
    }

    .timeline-content {
        padding: 20px;
    }

    .tech-grid,
    .brand-grid,
    .equipment-grid {
        gap: 16px;
    }
}

/* ============================================
   滚动与动画
   ============================================ */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    animation: slideUp 0.6s ease-out;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 防止文本选中时的蓝色背景过亮 */
::selection {
    background: rgba(59, 130, 246, 0.5);
    color: var(--text-primary);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.5);
}

::-webkit-scrollbar-thumb {
    background: rgba(59, 130, 246, 0.5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(59, 130, 246, 0.7);
}