/* ============================================
   汇智软件镜像 - Modern Dark Theme Stylesheet
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #1a1a25;
    --bg-card: #13131f;
    --bg-card-hover: #181825;
    --bg-code: #0d0d14;
    --bg-elevated: #1e1e2e;
    
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #6e6e80;
    --text-accent: #818cf8;
    
    --border-primary: rgba(255, 255, 255, 0.06);
    --border-secondary: rgba(255, 255, 255, 0.1);
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-hero: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.1) 100%);
    --gradient-text: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
}

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

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

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

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

ul {
    list-style: none;
}

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

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
    white-space: nowrap;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 15px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-outline:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-accent);
    color: var(--text-accent);
}

.btn-block {
    width: 100%;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-primary);
    transition: background var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo svg {
    flex-shrink: 0;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-menu a {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-menu .btn {
    margin-left: 8px;
}

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

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
    top: -10%;
    right: -5%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, transparent 70%);
    bottom: -10%;
    left: -5%;
    animation-delay: -3s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
    top: 40%;
    left: 30%;
    animation-delay: -5s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.8); }
}

.hero h1 {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

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

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

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

/* ============================================
   Section Common Styles
   ============================================ */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-accent);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.section-header p {
    font-size: 17px;
    color: var(--text-secondary);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-secondary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.icon-ai {
    background: rgba(99, 102, 241, 0.15);
    color: #818cf8;
}

.icon-speed {
    background: rgba(34, 197, 94, 0.15);
    color: #4ade80;
}

.icon-complete {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
}

.icon-security {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Install Section
   ============================================ */
.install {
    background: var(--bg-primary);
}

.install-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 40px;
}

.tab-btn {
    padding: 10px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--bg-tertiary);
    border-color: var(--text-accent);
    color: var(--text-accent);
}

.tab-content {
    display: none;
    max-width: 700px;
    margin: 0 auto;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.install-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.install-card-header {
    margin-bottom: 24px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.install-card-header h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 4px;
}

.install-card-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
}

.badge-premium {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Code Block */
.code-block {
    background: var(--bg-code);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 20px;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-primary);
}

.code-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-secondary);
}

.copy-btn.copied {
    background: rgba(34, 197, 94, 0.15);
    color: #4ade80;
    border-color: rgba(34, 197, 94, 0.2);
}

.code-block pre {
    padding: 16px;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
    word-break: break-all;
}

.install-note {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 16px;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.install-note svg {
    flex-shrink: 0;
    color: #60a5fa;
    margin-top: 2px;
}

/* Install Methods (Enterprise) */
.install-methods {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.method-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.method-item:hover {
    border-color: var(--border-secondary);
    background: var(--bg-secondary);
}

.method-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-accent);
    flex-shrink: 0;
}

.method-info {
    flex: 1;
    min-width: 0;
}

.method-info h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
}

.method-info p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.pricing-card {
    position: relative;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    border-color: var(--border-secondary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.pricing-card.popular {
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-glow);
}

.pricing-card.popular:hover {
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 50px rgba(99, 102, 241, 0.2);
}

.popular-badge {
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--gradient-primary);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.pricing-header {
    margin-bottom: 24px;
    text-align: center;
}

.pricing-header h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.pricing-price {
    margin-bottom: 4px;
}

.price-free {
    font-size: 36px;
    font-weight: 700;
    color: #4ade80;
}

.price-amount {
    font-size: 36px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-unit {
    font-size: 16px;
    color: var(--text-secondary);
    margin-left: 4px;
}

.price-custom {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-accent);
}

.price-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.pricing-features {
    flex: 1;
    margin-bottom: 24px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.pricing-features li svg {
    flex-shrink: 0;
    color: #4ade80;
}

.feature-divider {
    height: 1px;
    background: var(--border-primary);
    margin: 8px 0;
    padding: 0 !important;
}

/* Pricing Extra */
.pricing-extra {
    max-width: 500px;
    margin: 0 auto;
}

.extra-card {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.extra-card:hover {
    border-color: var(--border-secondary);
}

.extra-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.extra-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.extra-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.price-highlight {
    font-size: 42px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.extra-price span:last-child {
    font-size: 16px;
    color: var(--text-secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 280px;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-accent);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-primary);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-primary);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu a {
        width: 100%;
        padding: 12px 16px;
    }
    
    .nav-menu .btn {
        margin-left: 0;
        margin-top: 8px;
        width: 100%;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-stats {
        gap: 20px;
    }
    
    .stat-divider {
        display: none;
    }
    
    section {
        padding: 60px 0;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.popular {
        order: -1;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
    
    .install-card-header {
        flex-direction: column;
    }
    
    .method-item {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    
    .method-item .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .install-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-elevated);
}

/* Selection */
::selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}