/* ============================================
   JYAssistant - Professional Dark Theme (XWindowsSync Style)
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-card: #16161f;
    --color-bg-elevated: #1a1a24;

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-primary-glow: rgba(99, 102, 241, 0.3);

    --color-accent: #22d3ee;
    --color-accent-glow: rgba(34, 211, 238, 0.2);

    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-text: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.12);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    --gradient-card: linear-gradient(145deg, var(--color-bg-card) 0%, var(--color-bg-elevated) 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Typography */
    --font-family: 'Noto Sans SC', 'Noto Sans TC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--color-primary-glow);
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    background: rgba(10, 10, 15, 0.8);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    padding: var(--spacing-xs) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.brand-icon {
    width: 24px;
    height: 24px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-menu a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-text);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

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

.nav-cta {
    background: var(--gradient-primary);
    padding: var(--spacing-xs) var(--spacing-md) !important;
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--color-text) !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-cta::after {
    display: none !important;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text);
    border: 1px solid var(--color-border-light);
}

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

.btn-icon {
    font-size: 1.2em;
}

.btn-qq {
    background: #12B7F5;
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
}

.btn-qq:hover {
    background: #0ea5e9;
    transform: translateY(-2px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl) 0;
    overflow: hidden;
    padding-top: 100px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
    filter: blur(60px);
    opacity: 0.6;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.4;
        transform: translateX(-50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translateX(-50%) scale(1.1);
    }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    -webkit-mask-image: linear-gradient(180deg, transparent, black 20%, black 80%, transparent);
    mask-image: linear-gradient(180deg, transparent, black 20%, black 80%, transparent);
}

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

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--color-primary);
    border-radius: 50px;
    font-size: var(--font-size-sm);
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

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

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary-light);
}

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

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

/* ============================================
   Section Styling
   ============================================ */
section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50px;
    font-size: var(--font-size-sm);
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

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

/* ============================================
   Features
   ============================================ */
.features {
    background: var(--color-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   Showcase / Window
   ============================================ */
.showcase {
    background: var(--color-bg);
}

.preview-content {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.preview-window {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg), 0 0 60px rgba(99, 102, 241, 0.15);
}

.window-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.window-controls {
    display: flex;
    gap: 0;
}

.win-btn {
    width: 46px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.win-btn.close:hover { background: #e81123; color: white; }
.win-btn.minimize:hover, .win-btn.maximize:hover { background: rgba(255, 255, 255, 0.1); }

.window-title {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.window-body {
    position: relative;
    line-height: 0;
    display: flex;
    justify-content: center;
    background: var(--color-bg);
}

.preview-image {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Pins on Showcase */
.callout-pin {
    position: absolute;
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
    animation: pulsePin 2s infinite;
}

@keyframes pulsePin {
    0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6); }
    70% { box-shadow: 0 0 0 10px rgba(99, 102, 241, 0); }
    100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

.callout-pin::before {
    content: '';
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
}

.callout-tooltip {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    width: 220px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.callout-pin:hover .callout-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(15px);
}

.callout-tooltip strong {
    display: block;
    color: var(--color-primary-light);
    margin-bottom: 4px;
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.callout-tooltip p {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* Hardcoded pin positions */
.pin-1 { left: 20%; top: 15%; }
.pin-2 { left: 65%; top: 15%; }
.pin-3 { left: 50%; top: 45%; }
.pin-4 { left: 50%; top: 85%; }

/* ============================================
   Pricing
   ============================================ */
.pricing {
    background: var(--color-bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.pricing-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    transition: var(--transition-base);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--color-primary);
    background: linear-gradient(145deg, rgba(99, 102, 241, 0.1), var(--color-bg-card));
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    white-space: nowrap;
}

.pricing-header h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.pricing-header p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.pricing-price {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.pricing-desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.pricing-features {
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pricing-features li::before {
    content: '✓';
    color: var(--color-success);
    font-weight: bold;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Timeline (Purchase Steps)
   ============================================ */
.timeline-section {
    background: var(--color-bg);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.timeline-step {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition-base);
}

.timeline-step:hover {
    border-color: var(--color-primary);
    transform: translateX(10px);
}

.step-num {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.step-content h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 4px;
}

.step-content p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq {
    background: var(--color-bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

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

.faq-item summary {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    color: var(--color-text);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    list-style: none;
    transition: var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    color: var(--color-primary-light);
}

.faq-body {
    padding-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

/* ============================================
   Download Section
   ============================================ */
.download {
    background: var(--color-bg);
}

.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.info-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.info-card h4 {
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-base);
}

.info-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.download-box {
    background: var(--gradient-card);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-glow);
}

.download-box h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.step-list {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.step-list li {
    margin-bottom: var(--spacing-xs);
    list-style-type: decimal;
}

.box-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.mini-note {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.mini-note strong {
    color: var(--color-warning);
    font-size: var(--font-size-sm);
    display: block;
    margin-bottom: 4px;
}

.mini-note p {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.sub-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-align: center;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom > div {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-icon {
    width: 24px;
    height: 24px;
    opacity: 0.7;
}

.page-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ============================================
   Animations
   ============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.feature-card:nth-child(1) { transition-delay: 0s; }
.feature-card:nth-child(2) { transition-delay: 0.1s; }
.feature-card:nth-child(3) { transition-delay: 0.2s; }
.feature-card:nth-child(4) { transition-delay: 0.3s; }
.feature-card:nth-child(5) { transition-delay: 0.4s; }

.pricing-card:nth-child(1) { transition-delay: 0s; }
.pricing-card:nth-child(2) { transition-delay: 0.1s; }
.pricing-card:nth-child(3) { transition-delay: 0.2s; }

.timeline-step:nth-child(1) { transition-delay: 0s; }
.timeline-step:nth-child(2) { transition-delay: 0.1s; }
.timeline-step:nth-child(3) { transition-delay: 0.2s; }
.timeline-step:nth-child(4) { transition-delay: 0.3s; }
.timeline-step:nth-child(5) { transition-delay: 0.4s; }

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    background: rgba(16, 16, 24, 0.95);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.2);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-icon {
    color: var(--color-success);
    font-size: 1.2rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Responsive */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.95);
        -webkit-backdrop-filter: blur(12px);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 0;
        margin: 0;
        border-bottom: 1px solid var(--color-border);
        clip-path: inset(0 0 100% 0);
        transition: clip-path var(--transition-base);
    }
    
    .nav-menu.active {
        clip-path: inset(0 0 0 0);
        padding: var(--spacing-md) 0;
    }

    .hero-title { font-size: var(--font-size-4xl); }
    .hero-stats { flex-direction: column; gap: var(--spacing-md); }
    .stat-divider { width: 40px; height: 1px; }
    .download-grid { grid-template-columns: 1fr; }
    .box-actions { flex-direction: column; }
    .box-actions .btn { width: 100%; }
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: var(--color-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.contact-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.contact-card>p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
}

.bank-info {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.bank-row {
    display: flex;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
}

.bank-label {
    color: var(--color-text-muted);
    min-width: 60px;
}

.bank-value {
    color: var(--color-text);
    font-family: monospace;
}

.contact-card .btn {
    width: 100%;
}


/* LINE Button */
.btn-line {
    background: #00B900;
    border-color: #00B900;
    color: white;
}

.btn-line:hover {
    background: #00a000;
    border-color: #00a000;
    transform: translateY(-2px);
}

/* WeChat Button */
.btn-wechat {
    background: #07C160;
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.btn-wechat:hover {
    background: #06a050;
    transform: translateY(-2px);
}

/* QQ Button */
.btn-qq {
    background: #12B7F5;
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
}

.btn-qq:hover {
    background: #0ea5e9;
    transform: translateY(-2px);
}

/* Contact Divider */
.contact-divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-lg) 0;
}

.contact-divider::before,
.contact-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.contact-divider span {
    padding: 0 var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* Contact Methods */
.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-methods .btn {
    width: 100%;
}

/* Contact Hint */
.contact-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

/* Modal Overlay */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    max-width: 350px;
    width: 90%;
}

.modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.modal-content h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.qr-code {
    width: 200px;
    height: 200px;
    margin: var(--spacing-md) auto;
    display: block;
    border-radius: var(--radius-md);
}

.modal-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}