/* Dark Gamma Theme - Professional Trading Interface */

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2332;
    --bg-hover: #1f2937;
    --accent-primary: #22d3ee;
    --accent-secondary: #3b82f6;
    --accent-danger: #ef4444;
    --accent-success: #10b981;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-color: #1f2937;
    --shadow: rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--accent-primary);
    padding: 1.2rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1800px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    letter-spacing: -0.5px;
}

.logo i {
    font-size: 2rem;
}

.header-stats {
    display: flex;
    gap: 1rem;
}

.stat-badge {
    background: var(--bg-tertiary);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--border-color);
}

.stat-badge i {
    color: var(--accent-primary);
}

/* Container */
.container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 0;
    max-width: 1800px;
    margin: 0 auto;
    min-height: calc(100vh - 140px);
}

/* Sidebar */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    height: calc(100vh - 80px);
    position: sticky;
    top: 80px;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-tertiary);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-collapse {
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Search Box */
.search-box {
    padding: 1rem 1.5rem;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.search-box i {
    position: absolute;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

/* Categories */
.categories-list {
    padding: 0.5rem 0;
}

.category-section {
    margin-bottom: 0.5rem;
}

.category-header {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.2s;
    user-select: none;
}

.category-header:hover {
    background: var(--bg-hover);
}

.category-icon {
    color: var(--accent-primary);
    transition: transform 0.3s;
    font-size: 0.8rem;
}

.category-name {
    flex: 1;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.category-count {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Videos List */
.videos-list {
    padding-left: 1rem;
}

.video-item {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.video-item:hover {
    background: var(--bg-hover);
    border-left-color: var(--accent-primary);
}

.video-item.active {
    background: var(--bg-tertiary);
    border-left-color: var(--accent-primary);
}

.video-item-content {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
}

.video-icon {
    font-size: 1.2rem;
    color: var(--accent-primary);
    margin-top: 0.2rem;
}

.video-info {
    flex: 1;
}

.video-title {
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 0.3rem;
    color: var(--text-primary);
}

.video-duration {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* Main Content */
.main-content {
    padding: 2rem;
    background: var(--bg-primary);
}

.video-player {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px var(--shadow);
    border: 1px solid var(--border-color);
}

.video-player iframe {
    width: 100%;
    height: 70vh;
    min-height: 500px;
    border: none;
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem;
    text-align: center;
}

.welcome-icon {
    font-size: 6rem;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    opacity: 0.3;
}

.welcome-screen h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-screen p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.welcome-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.welcome-stats .stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
}

.welcome-stats .stat i {
    font-size: 2.5rem;
    color: var(--accent-primary);
}

.welcome-stats .stat span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Video Details */
.video-details {
    margin-top: 2rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.details-header {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.details-header h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.video-meta {
    display: flex;
    gap: 1rem;
}

.badge {
    background: var(--bg-tertiary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--border-color);
}

.details-content p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Scrollbar */
.sidebar::-webkit-scrollbar {
    width: 8px;
}

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

.sidebar::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 280px 1fr;
    }
    
    .sidebar {
        height: calc(100vh - 70px);
        top: 70px;
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        height: auto;
        max-height: 50vh;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .welcome-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.video-details {
    animation: fadeIn 0.3s ease-out;
}