/* 
 * Web3 Exchange - Core Stylesheet
 * Completely Original Design
 */

:root {
    /* Color Palette */
    --primary: #6B5FFF;
    --primary-hover: #5A4EE6;
    --secondary: #00F0FF;
    --bg-dark: #0A0A1A;
    --bg-card: #15152A;
    --bg-light: #F5F7FA;
    --text-main: #FFFFFF;
    --text-muted: #A0A5C0;
    --text-dark: #1E1E30;
    --border: #2A2A4A;
    --success: #00FF88;
    --warning: #FFB800;
    --danger: #FF3366;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Fira Code', Consolas, Monaco, monospace;
    
    /* Spacing & Layout */
    --container-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
    --radius-pill: 9999px;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(107, 95, 255, 0.4);
    --transition: all 0.3s ease;
}

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

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

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

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

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

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

ul, ol {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-main);
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
}

.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
    gap: 1rem;
}

.flex-center {
    align-items: center;
    justify-content: center;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    color: #fff;
}

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

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 26, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo svg {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Search Box */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    color: var(--text-main);
    font-family: var(--font-sans);
    width: 200px;
    transition: var(--transition);
}

.search-input:focus {
    width: 250px;
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(107, 95, 255, 0.2);
}

.search-icon {
    position: absolute;
    left: 10px;
    color: var(--text-muted);
    width: 16px;
    height: 16px;
}

/* Hero Section */
.hero {
    padding: 12rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -10%;
    width: 50%;
    height: 50%;
    background: radial-gradient(circle, rgba(107, 95, 255, 0.2) 0%, rgba(10, 10, 26, 0) 70%);
    z-index: -1;
}

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

.hero-subtitle {
    display: inline-block;
    padding: 0.25rem 1rem;
    background-color: rgba(107, 95, 255, 0.1);
    color: var(--primary);
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(107, 95, 255, 0.2);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2.5rem;
}

.hero-image {
    margin-top: 4rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md), 0 0 40px rgba(107, 95, 255, 0.2);
    border: 1px solid var(--border);
    position: relative;
}

.hero-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30%;
    background: linear-gradient(to top, var(--bg-dark) 0%, transparent 100%);
}

/* Cards & Components */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    padding: 2rem;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background-color: rgba(107, 95, 255, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon svg {
    width: 24px;
    height: 24px;
}

/* Video Card */
.video-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
}

.video-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover img {
    transform: scale(1.05);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    width: 64px;
    height: 64px;
    background-color: rgba(10, 10, 26, 0.7);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    opacity: 0;
    transition: var(--transition);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.video-card:hover .play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    background-color: var(--primary);
    border-color: var(--primary);
}

.video-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(10, 10, 26, 0.9) 0%, transparent 100%);
}

.video-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.video-stats span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 3rem;
    margin-top: -3rem;
    position: relative;
    z-index: 10;
    box-shadow: var(--shadow-md);
}

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

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
    font-weight: 500;
}

/* Experts Section */
.expert-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.expert-card:hover {
    border-color: var(--primary);
}

.expert-img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
}

.expert-info {
    padding: 1.5rem;
}

.expert-role {
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.expert-social {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.expert-social a {
    color: var(--text-muted);
}

.expert-social a:hover {
    color: var(--secondary);
}

/* Testimonials */
.testimonial-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    padding: 2rem;
}

.testimonial-rating {
    color: var(--warning);
    margin-bottom: 1rem;
}

.testimonial-text {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #fff;
}

/* FAQ Section */
.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-main);
}

.faq-icon {
    color: var(--primary);
    transition: var(--transition);
}

.faq-answer {
    margin-top: 1rem;
    color: var(--text-muted);
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

/* Article Content */
.article-header {
    margin-bottom: 3rem;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-muted);
}

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

.article-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 1rem;
}

.article-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.article-content h2 {
    margin: 3rem 0 1.5rem;
}

.article-content h3 {
    margin: 2rem 0 1rem;
}

.article-content img {
    border-radius: var(--radius-md);
    margin: 2rem 0;
    border: 1px solid var(--border);
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

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

/* Footer */
.footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 5rem 0 2rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand p {
    margin-top: 1.5rem;
    max-width: 300px;
}

.footer-title {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.footer-links li {
    margin-bottom: 0.75rem;
}

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

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

.footer-contact {
    margin-top: 2rem;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.footer-qr {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

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

.qr-box img {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    background-color: #fff;
    padding: 0.25rem;
}

.qr-box span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary);
    color: #fff;
}

/* Responsive */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    
    .nav-links { display: none; }
    
    .hero { padding: 8rem 0 4rem; }
}

@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; gap: 1.5rem; padding: 2rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
    
    .search-container { display: none; }
}