/* ============================================================
   数元漫行科技 DigiPath Cloud — 视觉设计系统 v2.0
   浅色专业风 | 全屏沉浸 | 科技感
   ============================================================ */

/* ── No external fonts (China-compatible) ── */

/* ── CSS Custom Properties ── */
:root {
    /* Primary palette */
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;

    /* Accent */
    --accent: #6366f1;
    --accent-light: #e0e7ff;
    --teal: #06b6d4;
    --teal-light: #cffafe;

    /* Neutrals */
    --bg: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --surface: #ffffff;
    --border: #e2e8f0;
    --border-light: #f1f5f9;

    /* Text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1a56db, #6366f1);
    --gradient-tech: linear-gradient(135deg, #1a56db, #06b6d4, #6366f1);
    --gradient-hero: linear-gradient(180deg, #f0f9ff 0%, #ffffff 40%, #f8fafc 100%);
    --gradient-card: linear-gradient(135deg, rgba(26,86,219,0.03), rgba(99,102,241,0.05));

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -6px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 50px -12px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 30px rgba(26,86,219,0.15), 0 0 60px rgba(99,102,241,0.08);

    /* Typography */
    --font-display: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;

    /* Animation */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 600ms;
    --duration-page: 800ms;

    /* Layout */
    --navbar-height: 72px;
    --section-padding: 120px;
    --content-width: 1200px;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    background: var(--bg);
    overflow-x: hidden;
    padding-top: 0;
}

/* ── Scroll Progress Bar ── */
.scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    background: var(--gradient-tech);
    z-index: 10000;
    transition: width 50ms linear;
    border-radius: 0 2px 2px 0;
}

/* ── Particle Canvas ── */
#particle-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
}

/* ── Navigation ── */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--navbar-height);
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--duration-normal) var(--ease-out);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 32px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    font-family: var(--font-display);
}

.navbar-brand img {
    height: 36px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-50);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px; left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px; height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transition: transform var(--duration-normal) var(--ease-spring);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text-primary);
}

/* ── Section Base ── */
.section {
    position: relative;
    padding: var(--section-padding) 32px;
    z-index: 1;
}

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

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--primary-50);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

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

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 12px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(26,86,219,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26,86,219,0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: var(--primary-50);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.05rem;
    border-radius: 14px;
}

/* ── Hero Section ── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    position: relative;
    padding-top: var(--navbar-height);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 32px;
    animation: fadeInUp 0.8s var(--ease-out);
}

.hero-badge .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse 2s infinite;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s var(--ease-out) 0.1s both;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    min-height: 32px;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.hero-subtitle .cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--primary);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 0.8s infinite;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
    z-index: 2;
}

/* ── Stats Section ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    max-width: var(--content-width);
    margin: 0 auto;
}

.stat-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    transition: all var(--duration-normal) var(--ease-out);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-unit {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary);
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ── Capability Radar ── */
.capability-section {
    background: var(--bg-secondary);
}

.capability-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    max-width: var(--content-width);
    margin: 0 auto;
    align-items: center;
}

.radar-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.radar-container canvas {
    max-width: 100%;
}

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

.capability-item h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.capability-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.capability-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--gradient-tech);
    transition: width 1.5s var(--ease-out);
}

/* ── Service Tabs ── */
.service-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.service-tab {
    padding: 12px 28px;
    border-radius: 100px;
    border: 2px solid var(--border);
    background: var(--surface);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.service-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(26,86,219,0.3);
}

.service-tab:hover:not(.active) {
    border-color: var(--primary-200);
    color: var(--primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: var(--content-width);
    margin: 0 auto;
}

.service-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 36px 28px;
    transition: all var(--duration-normal) var(--ease-out);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-tech);
    transform: scaleX(0);
    transition: transform var(--duration-normal) var(--ease-out);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}

.service-card:hover::before { transform: scaleX(1); }

.service-card-icon {
    width: 56px; height: 56px;
    background: var(--primary-50);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary);
}

.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.service-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.service-card .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 16px;
}

.tag {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 100px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* ── Case Cards ── */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: var(--content-width);
    margin: 0 auto;
}

.case-card {
    background: var(--surface);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all var(--duration-normal) var(--ease-out);
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    height: 200px;
    background: var(--gradient-technique, linear-gradient(135deg, var(--primary-100), var(--accent-light)));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary);
}

.case-body {
    padding: 28px;
    flex: 1;
}

.case-body .badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 100px;
    background: var(--primary-50);
    color: var(--primary);
    margin-bottom: 12px;
}

.case-body h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.case-body p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.case-stats {
    display: flex;
    gap: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

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

.case-stat-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
}

.case-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ── Timeline ── */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0; bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-left: 56px;
    margin-bottom: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 14px; top: 6px;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 3px var(--primary-200);
}

.timeline-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.timeline-title {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.timeline-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    background: #fef3c7;
    color: #92400e;
    margin-left: 8px;
}

/* ── Logo Wall ── */
.logo-wall {
    overflow: hidden;
    padding: 40px 0;
}

.logo-track {
    display: flex;
    gap: 64px;
    animation: scroll 30s linear infinite;
    width: max-content;
}

.logo-item {
    flex-shrink: 0;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
    opacity: 0.5;
    transition: opacity var(--duration-fast);
    white-space: nowrap;
}

.logo-item:hover { opacity: 1; }

/* ── CTA Section ── */
.cta-section {
    background: var(--bg-secondary);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(26,86,219,0.05) 0%, transparent 70%);
}

/* ── Footer ── */
.footer {
    background: var(--text-primary);
    color: rgba(255,255,255,0.7);
    padding: 64px 32px 32px;
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 48px;
    max-width: var(--content-width);
    margin: 0 auto;
}

.footer h5 {
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    transition: color var(--duration-fast);
    font-size: 0.9rem;
    line-height: 2.2;
}

.footer a:hover { color: #fff; }

.footer-bottom {
    max-width: var(--content-width);
    margin: 48px auto 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ── Page Header ── */
.page-header {
    padding: 120px 32px 48px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    list-style: none;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb a { color: var(--primary); text-decoration: none; }

/* ── Content Container ── */
.content-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* ── Flash Messages ── */
.flash-container {
    position: fixed;
    top: calc(var(--navbar-height) + 16px);
    right: 16px;
    z-index: 9999;
    max-width: 400px;
}

.alert {
    padding: 14px 20px;
    border-radius: 12px;
    margin-bottom: 8px;
    font-size: 0.9rem;
    animation: slideInRight 0.3s var(--ease-out);
    border: 1px solid;
}

.alert-success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.alert-danger { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.alert-warning { background: #fffbeb; border-color: #fde68a; color: #92400e; }
.alert-info { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }

/* ── Animations ── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

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

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

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ── Reveal on Scroll ── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--duration-page) var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    :root { --section-padding: 80px; }
    .section-title { font-size: 2rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr; }
    .capability-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .hero-title { font-size: clamp(2rem, 5vw, 3rem); }
}

@media (max-width: 768px) {
    :root { --section-padding: 64px; }
    .section-title { font-size: 1.75rem; }

    .nav-links {
        display: none;
        position: fixed;
        top: var(--navbar-height);
        left: 0; right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .stat-value { font-size: 2rem; }
    .services-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .page-header h1 { font-size: 1.8rem; }
    .service-tabs { flex-wrap: wrap; }
}

/* ── 404 / 500 Pages ── */
.error-page {
    padding: 160px 32px;
    text-align: center;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.error-code {
    font-family: var(--font-mono);
    font-size: 8rem;
    font-weight: 900;
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-page h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 24px 0 12px;
}