/* ============================================
   Character Amnesia - Website Styles
   ============================================ */

/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #f59e0b;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #0f172a;
    
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --text-inverse: #ffffff;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif SC', Georgia, serif;
    
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
    }
}

/* 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-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

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

a:hover {
    color: var(--primary-dark);
}

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

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0.75rem var(--container-padding);
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

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

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

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

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6rem 1.5rem 4rem;
    overflow: hidden;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

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

.floating-bubbles {
    position: absolute;
    inset: 0;
}

.floating-bubbles span {
    position: absolute;
    font-family: var(--font-serif);
    font-size: clamp(2rem, 6vw, 4rem);
    color: rgba(99, 102, 241, 0.08);
    animation: float 20s infinite;
    animation-delay: calc(var(--i) * -2s);
}

.floating-bubbles span:nth-child(1) { top: 10%; left: 10%; }
.floating-bubbles span:nth-child(2) { top: 20%; right: 15%; }
.floating-bubbles span:nth-child(3) { top: 60%; left: 5%; }
.floating-bubbles span:nth-child(4) { top: 40%; right: 10%; }
.floating-bubbles span:nth-child(5) { top: 80%; left: 20%; }
.floating-bubbles span:nth-child(6) { top: 15%; left: 50%; }
.floating-bubbles span:nth-child(7) { top: 70%; right: 25%; }
.floating-bubbles span:nth-child(8) { top: 30%; left: 80%; }
.floating-bubbles span:nth-child(9) { top: 55%; left: 35%; }
.floating-bubbles span:nth-child(10) { top: 85%; right: 5%; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-20px) rotate(5deg); }
    50% { transform: translateY(-10px) rotate(-5deg); }
    75% { transform: translateY(-30px) rotate(3deg); }
}

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

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 1.5rem;
}

.hero-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.hero-title .zh {
    font-family: var(--font-serif);
    font-size: clamp(4rem, 12vw, 7rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-title .divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
}

.hero-title .en {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
}

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

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header.center {
    text-align: center;
}

.section-tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

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

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: 6rem 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.25rem;
    color: var(--primary);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Stats Section
   ============================================ */
.stats {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.stat-number,
.stat-suffix {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    display: block;
    width: 100%;
    font-size: 0.9375rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

/* ============================================
   Showcase Section
   ============================================ */
.showcase {
    padding: 6rem 0;
    background: var(--bg-secondary);
    overflow: hidden;
}

.showcase-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.showcase-text .section-tag {
    margin-bottom: 1rem;
}

.showcase-text .section-title {
    margin-bottom: 1.5rem;
}

.showcase-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.showcase-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    color: var(--text-secondary);
}

.check-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--success);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    flex-shrink: 0;
}

.showcase-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--gray-900);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.screen-content {
    position: absolute;
    inset: 0;
    padding: 2rem 1rem;
}

.mock-word-cloud {
    position: relative;
    width: 100%;
    height: 100%;
}

.mock-word {
    position: absolute;
    left: var(--x);
    top: var(--y);
    padding: 0.5rem 1rem;
    background: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    animation: mockFloat 3s ease-in-out infinite;
    animation-delay: var(--d);
}

.mock-word.main {
    left: 50%;
    top: 45%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

@keyframes mockFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ============================================
   Tech Stack Section
   ============================================ */
.tech-stack {
    padding: 6rem 0;
    background: var(--bg-primary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.tech-item:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.tech-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.tech-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   CTA Section
   ============================================ */
.cta {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--gray-900), #1e1b4b);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-desc {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 500px;
    margin: 0 auto 2rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 4rem 0 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--gray-200);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-made {
    margin-top: 0.5rem;
    color: var(--text-light);
}

/* ============================================
   Page Header (Privacy & Support)
   ============================================ */
.page-header {
    padding: 8rem 0 3rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-align: center;
}

.support-header {
    padding-bottom: 4rem;
}

.page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
}

/* Search Box */
.search-box {
    position: relative;
    max-width: 500px;
    margin: 2rem auto 0;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: none;
    border-radius: var(--radius-xl);
    font-size: 1rem;
    background: white;
    color: var(--gray-900);
    box-shadow: var(--shadow-lg);
}

.search-box input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

.search-box input::placeholder {
    color: var(--gray-400);
}

/* ============================================
   Page Content
   ============================================ */
.page-content {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.content-wrapper {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 3rem;
    align-items: start;
}

/* Table of Contents */
.toc {
    position: sticky;
    top: 100px;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
}

.toc h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: 0.5rem;
}

.toc a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    padding: 0.375rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    margin-left: -0.75rem;
    transition: var(--transition-fast);
}

.toc a:hover {
    color: var(--primary);
    border-left-color: var(--primary-light);
}

/* Content Body */
.content-body {
    max-width: 800px;
}

.last-updated {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-200);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.content-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.content-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section ul,
.content-section ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.content-section.highlight {
    padding: 1.5rem;
    background: rgba(99, 102, 241, 0.05);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
}

/* Info Box */
.info-box {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    color: var(--gray-800);
}

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

.info-content p {
    margin: 0;
}

/* No List */
.no-list {
    list-style: none;
    margin-left: 0;
}

.no-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.x-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--error);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* Contact Card */
.contact-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.contact-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   Quick Links
   ============================================ */
.quick-links {
    padding: 3rem 0;
    background: var(--bg-secondary);
    margin-top: -3rem;
    position: relative;
    z-index: 1;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.quick-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.quick-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.quick-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.quick-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-section {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.faq-categories {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.faq-cat-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--gray-200);
    background: white;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-cat-btn:hover,
.faq-cat-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-100);
}

.faq-item.hidden {
    display: none;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: currentColor;
    transition: var(--transition);
}

.faq-icon::before {
    width: 12px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-icon::after {
    width: 2px;
    height: 12px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-item.active .faq-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
}

.faq-content {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
}

.faq-content p,
.faq-content ul,
.faq-content ol {
    margin-bottom: 1rem;
}

.faq-content ol,
.faq-content ul {
    margin-left: 1.5rem;
}

.faq-content li {
    margin-bottom: 0.5rem;
}

/* Color List */
.color-list {
    list-style: none;
    margin-left: 0;
}

.color-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.color-dot {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* ============================================
   Troubleshooting Section
   ============================================ */
.troubleshooting-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.troubleshoot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.troubleshoot-card {
    padding: 2rem;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.troubleshoot-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.troubleshoot-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

.troubleshoot-card li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.troubleshoot-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info .section-title {
    margin-bottom: 1rem;
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-method {
    display: flex;
    gap: 1rem;
}

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

.method-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.method-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.method-link {
    font-size: 0.9375rem;
    font-weight: 500;
}

/* Contact Form */
.contact-form-wrapper {
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-100);
}

.contact-form h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-family: inherit;
    background: white;
    color: var(--gray-900);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .toc {
        position: static;
        order: -1;
    }
    
    .showcase-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 1rem 0;
        border-bottom: 1px solid var(--gray-100);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quick-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .troubleshoot-grid {
        grid-template-columns: 1fr;
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
}

@media (max-width: 480px) {
    .hero-title .zh {
        font-size: 3.5rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .faq-categories {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        flex-wrap: nowrap;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Language Selector
   ============================================ */
.lang-selector-nav {
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--gray-200);
}

.lang-dropdown {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.lang-btn:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

.lang-icon {
    width: 18px;
    height: 18px;
}

.lang-arrow {
    width: 14px;
    height: 14px;
    transition: transform 0.2s ease;
}

.lang-dropdown:hover .lang-arrow,
.lang-dropdown.active .lang-arrow {
    transform: rotate(180deg);
}

.lang-options {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 140px;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
}

.lang-dropdown:hover .lang-options,
.lang-dropdown.active .lang-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.lang-option:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.lang-option.active {
    color: var(--primary);
    font-weight: 600;
    background: rgba(99, 102, 241, 0.05);
}

.lang-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Mobile Language Selector */
@media (max-width: 768px) {
    .lang-selector-nav {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        padding: 1rem 0;
        border-bottom: 1px solid var(--gray-100);
    }
    
    .lang-btn {
        width: 100%;
        justify-content: flex-start;
    }
    
    .lang-options {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        margin-top: 0.5rem;
        display: none;
    }
    
    .lang-dropdown.active .lang-options {
        display: block;
    }
    
    .lang-arrow {
        margin-left: auto;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .hero-bg,
    .scroll-indicator,
    .btn,
    .footer,
    .lang-selector-nav {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    body {
        font-size: 12pt;
    }
}