/* =====================================================
   小黄鱼趋势辅助 - 主样式表
   ===================================================== */

/* CSS Variables */
:root {
    --gold-50: #FFFBEB;
    --gold-100: #FEF3C7;
    --gold-200: #FDE68A;
    --gold-300: #FCD34D;
    --gold-400: #FBBF24;
    --gold-500: #F59E0B;
    --gold-600: #D97706;
    --gold-700: #B45309;
    --gold-800: #92400E;
    --gold-900: #78350F;
    
    --dark-50: #F8FAFC;
    --dark-100: #F1F5F9;
    --dark-200: #E2E8F0;
    --dark-300: #CBD5E1;
    --dark-400: #94A3B8;
    --dark-500: #64748B;
    --dark-600: #475569;
    --dark-700: #334155;
    --dark-800: #1E293B;
    --dark-900: #0F172A;
    --dark-950: #020617;
    
    --primary: #FFD700;
    --primary-dark: #B8860B;
    --primary-light: #FFE55C;
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a25;
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0B0;
    --text-muted: #6B7280;
    --border-color: rgba(255, 215, 0, 0.1);
    --shadow-gold: 0 0 30px rgba(255, 215, 0, 0.15);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =====================================================
   Navigation
   ===================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.75rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--gold-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

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

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

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

.btn-nav {
    background: linear-gradient(135deg, var(--primary), var(--gold-500));
    color: var(--dark-900) !important;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
}

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

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

.nav-user {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--gold-600));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--dark-900);
    cursor: pointer;
    transition: var(--transition);
}

.nav-avatar:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-gold);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

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

.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    z-index: 999;
    overflow-y: auto;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-menu a {
    display: block;
    padding: 16px 20px;
    font-size: 1.1rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mobile-menu a:hover,
.mobile-menu a:active {
    color: var(--primary);
    background: var(--bg-card-hover);
}

.mobile-menu .btn-primary {
    text-align: center;
    justify-content: center;
    margin-top: 16px;
}

/* =====================================================
   Buttons
   ===================================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--gold-500));
    color: var(--dark-900);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(255, 215, 0, 0.3);
}

.btn-primary svg {
    transition: var(--transition);
}

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: var(--primary);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 215, 0, 0.1);
    transform: translateY(-3px);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.btn-small {
    padding: 10px 20px;
    font-size: 0.9rem;
}

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

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

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255, 215, 0, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(255, 215, 0, 0.08), transparent),
        radial-gradient(ellipse 40% 30% at 20% 80%, rgba(184, 134, 11, 0.1), transparent);
}

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

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary), var(--gold-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* App Preview */
.hero-image {
    display: flex;
    justify-content: center;
}

.app-preview {
    position: relative;
}

.app-mockup {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        var(--shadow-gold);
    width: 100%;
    max-width: 450px;
}

.mockup-header {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-color);
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--dark-600);
}

.mockup-dot:first-child { background: #ff5f56; }
.mockup-dot:nth-child(2) { background: #ffbd2e; }
.mockup-dot:nth-child(3) { background: #27ca40; }

.mockup-content {
    padding: 24px;
    min-height: 280px;
}

.chart-placeholder {
    position: relative;
    height: 200px;
}

.chart-svg {
    width: 100%;
    height: 100%;
}

.chart-line {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 2s ease-out forwards;
}

@keyframes drawLine {
    to { stroke-dashoffset: 0; }
}

.chart-dot {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { r: 6; opacity: 1; }
    50% { r: 10; opacity: 0.7; }
}

.price-tag {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.price-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.price-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.price-change {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 4px;
}

.price-change.positive { color: #22c55e; }
.price-change.negative { color: #ef4444; }

.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: 0.85rem;
    animation: bounce 2s infinite;
}

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

/* =====================================================
   Section Common Styles
   ===================================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    background: rgba(255, 215, 0, 0.1);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* =====================================================
   Features Section
   ===================================================== */
.features {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-8px);
    box-shadow: var(--shadow-gold);
    border-color: rgba(255, 215, 0, 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 215, 0, 0.05));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

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

/* =====================================================
   Showcase Section
   ===================================================== */
.showcase {
    padding: 100px 0;
    background: var(--bg-card);
}

.showcase-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.showcase-text .section-tag {
    margin-bottom: 20px;
}

.showcase-text .section-title {
    text-align: left;
    margin-bottom: 20px;
}

.showcase-text > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1.05rem;
}

.showcase-features {
    margin-bottom: 32px;
}

.showcase-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.phone-mockup {
    background: linear-gradient(180deg, #1a1a25 0%, #0a0a0f 100%);
    border-radius: 40px;
    padding: 12px;
    border: 4px solid #2a2a35;
    box-shadow: 
        0 50px 100px -20px rgba(0, 0, 0, 0.7),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    max-width: 320px;
    margin: 0 auto;
}

.phone-screen {
    background: var(--bg-dark);
    border-radius: 28px;
    overflow: hidden;
    height: 580px;
}

.phone-screen iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* =====================================================
   Articles Section
   ===================================================== */
.articles {
    padding: 100px 0;
    background: var(--bg-dark);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-gold);
    border-color: rgba(255, 215, 0, 0.3);
}

.article-image {
    height: 180px;
    background: linear-gradient(135deg, var(--dark-700), var(--dark-800));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-image svg {
    width: 48px;
    height: 48px;
    stroke: var(--dark-500);
}

.article-content {
    padding: 24px;
}

.article-tag {
    display: inline-block;
    background: rgba(255, 215, 0, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.article-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.articles-more {
    text-align: center;
}

/* =====================================================
   Download Section
   ===================================================== */
.download {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 50%, var(--bg-dark) 100%);
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.08), transparent 70%);
    pointer-events: none;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.download-text .section-tag {
    margin-bottom: 20px;
}

.download-text .section-title {
    text-align: left;
    margin-bottom: 16px;
}

.download-text > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1.05rem;
    max-width: 500px;
}

.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.download-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    transform: translateY(-3px);
}

.download-btn svg {
    width: 28px;
    height: 28px;
}

.download-btn-text span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.download-btn-text strong {
    display: block;
    font-size: 1rem;
    font-weight: 600;
}

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

.qr-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
}

.qr-placeholder {
    width: 160px;
    height: 160px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.qr-placeholder svg {
    width: 80px;
    height: 80px;
    stroke: var(--dark-500);
}

.qr-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
    background: var(--dark-950);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

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

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 300px;
}

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

.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.disclaimer {
    font-size: 0.8rem !important;
    color: var(--text-muted);
    opacity: 0.7;
}

/* =====================================================
   Auth Pages (Login/Register)
   ===================================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    background: var(--bg-dark);
    position: relative;
}

.auth-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 60% 40% at 50% 0%, rgba(255, 215, 0, 0.1), transparent),
        radial-gradient(ellipse 40% 30% at 80% 80%, rgba(255, 215, 0, 0.05), transparent);
    pointer-events: none;
}

.auth-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.auth-header {
    text-align: center;
    margin-bottom: 36px;
}

.auth-header .logo {
    justify-content: center;
    margin-bottom: 24px;
}

.auth-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group .input-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.form-row a {
    color: var(--primary);
}

.form-row a:hover {
    text-decoration: underline;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.auth-form .btn-primary {
    width: 100%;
    justify-content: center;
    margin-top: 8px;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
}

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

.auth-divider span {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-footer a {
    color: var(--primary);
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* =====================================================
   User Dashboard
   ===================================================== */
.dashboard {
    padding-top: 100px;
    min-height: 100vh;
    background: var(--bg-dark);
}

.dashboard-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 40px 0;
    margin-bottom: 40px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 24px;
}

.user-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--gold-600));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-900);
}

.user-details h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.user-details p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.vip-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--primary), var(--gold-600));
    color: var(--dark-900);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-left: 12px;
}

.dashboard-content {
    padding-bottom: 60px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.dashboard-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.dashboard-card h3 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.dashboard-card .value {
    font-size: 2rem;
    font-weight: 700;
}

.dashboard-card .value.gold {
    color: var(--primary);
}

.dashboard-card .sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* VIP Activation */
.vip-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.vip-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.vip-section > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.vip-input-group {
    display: flex;
    gap: 12px;
    max-width: 500px;
}

.vip-input-group input {
    flex: 1;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: monospace;
    letter-spacing: 1px;
}

.vip-input-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.vip-benefits {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.vip-benefits h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: rgba(255, 215, 0, 0.05);
    border-radius: var(--radius-md);
}

.benefit-item svg {
    width: 24px;
    height: 24px;
    stroke: var(--primary);
    flex-shrink: 0;
}

.benefit-item span {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =====================================================
   Article Page
   ===================================================== */
.article-page {
    padding-top: 100px;
    min-height: 100vh;
    background: var(--bg-dark);
}

.article-hero {
    background: var(--bg-card);
    padding: 60px 0;
    margin-bottom: 40px;
}

.article-hero .section-tag {
    margin-bottom: 16px;
}

.article-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    max-width: 800px;
}

.article-hero .meta {
    display: flex;
    align-items: center;
    gap: 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding-bottom: 80px;
}

.article-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 40px 0 20px;
}

.article-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 32px 0 16px;
}

.article-body p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.article-body ul, .article-body ol {
    margin: 20px 0;
    padding-left: 24px;
}

.article-body li {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 12px;
    list-style: disc;
}

.article-body blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 24px;
    margin: 32px 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-body code {
    background: rgba(255, 215, 0, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: monospace;
    color: var(--primary);
}

.article-body pre {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    overflow-x: auto;
    margin: 24px 0;
}

.article-body pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* =====================================================
   Alerts & Messages
   ===================================================== */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.alert-warning {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    color: var(--primary);
}

/* =====================================================
   Loading States
   ===================================================== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        margin: 0 auto 36px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
        margin-bottom: 40px;
    }
    
    .app-mockup {
        max-width: 380px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .showcase-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .showcase-text {
        text-align: center;
    }
    
    .showcase-text .section-title {
        text-align: center;
    }
    
    .showcase-features {
        display: inline-block;
        text-align: left;
    }
    
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-text .section-title {
        text-align: center;
    }
    
    .download-text > p {
        margin: 0 auto 32px;
    }
    
    .download-buttons {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        margin-bottom: 20px;
    }
    
    .footer-brand .logo {
        justify-content: center;
    }
    
    .footer-brand p {
        margin: 0 auto;
    }
    
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .hero-stats {
        gap: 24px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .auth-card {
        padding: 32px 24px;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .vip-input-group {
        flex-direction: column;
    }
    
    .article-hero h1 {
        font-size: 1.75rem;
    }
    
    .scroll-indicator {
        display: none;
    }
}

/* =====================================================
   VIP Pricing Section
   ===================================================== */
.vip-pricing {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-dark) 50%, var(--bg-card) 100%);
    position: relative;
}

.vip-pricing::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1000px;
    height: 400px;
    background: radial-gradient(ellipse at center top, rgba(255, 215, 0, 0.1), transparent 70%);
    pointer-events: none;
}

.vip-benefits-showcase {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.benefit-showcase-item {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.benefit-showcase-item:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 215, 0, 0.3);
    box-shadow: var(--shadow-gold);
}

.benefit-icon-large {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 215, 0, 0.05));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.benefit-icon-large svg {
    width: 32px;
    height: 32px;
    stroke: var(--primary);
}

.benefit-showcase-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.benefit-showcase-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Pricing Cards */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    text-align: center;
    position: relative;
    transition: var(--transition);
}

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

.pricing-card.featured {
    border: 2px solid var(--primary);
    background: linear-gradient(180deg, rgba(255, 215, 0, 0.05) 0%, var(--bg-card) 100%);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--gold-500));
    color: var(--dark-900);
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
}

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

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.pricing-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.pricing-price {
    margin-bottom: 16px;
}

.pricing-price .currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    vertical-align: top;
}

.pricing-price .amount {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.pricing-price .period {
    font-size: 1rem;
    color: var(--text-muted);
}

.pricing-save {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 24px;
}

.pricing-features {
    text-align: left;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border-color);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features svg {
    width: 20px;
    height: 20px;
    stroke: var(--primary);
    flex-shrink: 0;
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
    width: 100%;
    justify-content: center;
}

/* Purchase Info */
.purchase-info {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
}

.purchase-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.purchase-info > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.contact-cards {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px 28px;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--primary);
    background: rgba(255, 215, 0, 0.05);
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon.qq {
    background: linear-gradient(135deg, #12B7F5, #0D8ECF);
}

.contact-icon.wechat {
    background: linear-gradient(135deg, #07C160, #05A14B);
}

.contact-icon svg {
    width: 28px;
    height: 28px;
    fill: white;
}

.contact-info {
    text-align: left;
}

.contact-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.contact-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    font-family: monospace;
    letter-spacing: 1px;
}

.copy-btn {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: var(--primary);
    color: var(--dark-900);
}

.purchase-note {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =====================================================
   Utility Classes
   ===================================================== */
.hidden {
    display: none !important;
}

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

.text-gold {
    color: var(--primary);
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

/* Responsive for VIP Section */
@media (max-width: 1024px) {
    .vip-benefits-showcase {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .pricing-card.featured {
        transform: none;
        order: -1;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
}

@media (max-width: 768px) {
    .vip-benefits-showcase {
        grid-template-columns: 1fr;
    }
    
    .contact-cards {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-card {
        width: 100%;
        max-width: 320px;
    }
    
    .purchase-info {
        padding: 32px 24px;
    }
}

/* =====================================================
   Tutorial Banner Section
   ===================================================== */
.tutorial-banner {
    background: linear-gradient(180deg, rgba(255, 215, 0, 0.08) 0%, transparent 100%);
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.tutorial-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.tutorial-header h2 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.fire-icon {
    font-size: 2rem;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.tutorial-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.tutorial-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.tutorial-card {
    position: relative;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    overflow: hidden;
}

.tutorial-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 2px;
    background: linear-gradient(135deg, var(--primary), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.trend-card {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.05));
}

.trend-card:hover {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.25), rgba(34, 197, 94, 0.1));
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(34, 197, 94, 0.2);
}

.oscillation-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.05));
}

.oscillation-card:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.25), rgba(59, 130, 246, 0.1));
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.2);
}

.card-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.trend-card .card-badge {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.oscillation-card .card-badge {
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
}

.tutorial-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #fff;
}

.tutorial-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.card-action {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: var(--dark-900);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.tutorial-card:hover .card-action {
    background: #fff;
    transform: scale(1.05);
}

@media (max-width: 768px) {
    .tutorial-banner {
        padding: 40px 0;
    }
    
    .tutorial-header h2 {
        font-size: 1.5rem;
    }
    
    .fire-icon {
        font-size: 1.5rem;
    }
    
    .tutorial-cards {
        grid-template-columns: 1fr;
        padding: 0 16px;
    }
    
    .tutorial-card {
        padding: 24px;
    }
    
    .tutorial-card h3 {
        font-size: 1.25rem;
    }
}