@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* Style Constants & Color System */
:root {
    --bg-base: #08090f;
    --bg-surface: #0f111a;
    --bg-surface-elevated: #161825;
    --bg-card: rgba(22, 24, 37, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-active: rgba(99, 102, 241, 0.3);
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.15);
    
    --secondary: #06b6d4;
    --secondary-hover: #0891b2;
    --secondary-glow: rgba(6, 182, 212, 0.15);
    
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --sidebar-width: 260px;
    --header-height: 80px;
    --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Reset & Layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

/* Background Gradients */
.bg-glow-purple {
    position: fixed;
    top: -10%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
}

.bg-glow-cyan {
    position: fixed;
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Layout Framework */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styling */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.brand-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.brand-logo svg {
    color: var(--text-primary);
    width: 22px;
    height: 22px;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, var(--text-primary), #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.nav-link svg {
    width: 20px;
    height: 20px;
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-surface-elevated);
}

.nav-link.active {
    color: var(--text-primary);
    background-color: var(--primary-glow);
    border-color: var(--border-color-active);
}

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

.sidebar-footer {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* User Subscribed Status Box */
.user-status-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
}

.user-status-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.user-status-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

/* Main Content Area */
.main-wrapper {
    flex-grow: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: rgba(8, 9, 15, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 90;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Subscription Switcher Simulation Badge */
.sim-badge {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: var(--warning);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sim-badge .pulse {
    width: 6px;
    height: 6px;
    background-color: var(--warning);
    border-radius: 50%;
    animation: pulseGlow 1.5s infinite;
}

@keyframes pulseGlow {
    0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(245, 158, 11, 0); }
    100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

.profile-switcher {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: var(--transition-smooth);
}

.profile-switcher:hover {
    border-color: var(--text-secondary);
}

.content-body {
    padding: 2.5rem;
    flex-grow: 1;
}

/* Glassmorphism Common Styles */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-main);
    transition: var(--transition-smooth);
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

/* Dashboard Home Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.primary { background: var(--primary-glow); color: var(--primary); }
.stat-icon.cyan { background: var(--secondary-glow); color: var(--secondary); }
.stat-icon.accent { background: rgba(236, 72, 153, 0.1); color: var(--accent); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.1rem;
}

/* Continue Learning Banner */
.continue-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.continue-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.continue-details {
    max-width: 60%;
}

.continue-subtitle {
    text-transform: uppercase;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.continue-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.continue-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.continue-action {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-primary);
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 4px 18px var(--primary-glow);
    transition: var(--transition-smooth);
}

.continue-action:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px var(--primary-glow);
}

/* Content Lists Section Header */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.section-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: var(--transition-smooth);
}

.section-link:hover {
    color: var(--primary-hover);
    transform: translateX(3px);
}

/* Course Grid System */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* Course Cards */
.course-card {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-color-active);
}

.card-banner {
    height: 160px;
    position: relative;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: white;
}

.card-badge {
    align-self: flex-start;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-duration {
    align-self: flex-end;
    background: rgba(0, 0, 0, 0.65);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.meta-item svg {
    width: 14px;
    height: 14px;
}

.course-title-link {
    text-decoration: none;
    color: var(--text-primary);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    transition: var(--transition-smooth);
}

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

.card-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

/* Progress Section in Cards */
.progress-container {
    margin-top: auto;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.progress-label {
    color: var(--text-secondary);
}

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

.progress-bar-bg {
    height: 6px;
    background: var(--bg-surface-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    transition: width 0.6s ease-out;
}

.card-footer {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.instructor-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.instructor-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-surface-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    color: var(--secondary);
}

.instructor-name {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.card-link-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.card-link-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateX(2px);
}

/* Empty State Styling */
.empty-state {
    padding: 4rem 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.empty-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.empty-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.empty-desc {
    color: var(--text-secondary);
    max-width: 400px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* Course Filters & Search Row */
.filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    gap: 1rem;
}

.search-container {
    position: relative;
    flex-grow: 1;
    max-width: 400px;
}

.search-input {
    width: 100%;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-smooth);
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary-glow);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-icon svg {
    width: 18px;
    height: 18px;
}

.filter-pills {
    display: flex;
    gap: 0.75rem;
}

.filter-pill {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.filter-pill:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.filter-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Video Player Layout (Split Screen) */
.player-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 2rem;
    height: calc(100vh - var(--header-height) - 5rem);
}

.player-main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: 100%;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.video-container {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-main);
    position: relative;
}

.video-element {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-details {
    padding: 0.5rem 0;
}

.video-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.video-info-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.action-btn.secondary {
    background: var(--bg-surface-elevated);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.action-btn.secondary:hover {
    background: rgba(255,255,255,0.06);
}

.action-btn.success-btn {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.action-btn.success-btn:hover {
    background: var(--success);
    color: white;
}

.action-btn.success-btn.completed {
    background: var(--success);
    color: white;
}

.video-description {
    padding-top: 1.25rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Sidebar Playlist (Course Video List) */
.player-sidebar {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header-box {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-course-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.playlist-content {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
}

/* Accordion Module */
.playlist-module {
    margin-bottom: 1.25rem;
}

.module-header {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    padding: 0 0.5rem;
}

.playlist-items {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    text-align: left;
    background: transparent;
    width: 100%;
    color: var(--text-secondary);
}

.playlist-item:hover {
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
}

.playlist-item.active {
    background: var(--primary-glow);
    border-color: var(--border-color-active);
    color: var(--text-primary);
}

.playlist-item.completed .item-status-icon {
    color: var(--success);
}

.item-status-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.item-status-icon svg {
    width: 18px;
    height: 18px;
}

.item-details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
}

.item-title {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.item-duration {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Intro Page Styling */
.intro-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.intro-hero {
    text-align: center;
    margin-bottom: 4rem;
}

.intro-logo {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    box-shadow: 0 10px 25px var(--primary-glow);
}

.intro-logo svg {
    width: 38px;
    height: 38px;
}

.intro-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
}

.intro-lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

.intro-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.intro-card {
    padding: 2.5rem;
    text-align: left;
}

.intro-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.intro-card-icon.primary { background: var(--primary-glow); color: var(--primary); }
.intro-card-icon.cyan { background: var(--secondary-glow); color: var(--secondary); }
.intro-card-icon.accent { background: rgba(236, 72, 153, 0.1); color: var(--accent); }

.intro-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.intro-card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.intro-portal {
    background: linear-gradient(135deg, rgba(22, 24, 37, 0.8) 0%, rgba(15, 17, 26, 0.8) 100%);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-main);
}

.portal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.portal-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 550px;
    margin: 0 auto 2rem auto;
}

.portal-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: 0 4px 18px var(--primary-glow);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--primary-glow);
}

.btn.outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn.outline:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* Responsive Queries */
@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .intro-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    .player-layout {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }
    .player-sidebar {
        height: 500px;
    }
}

@media (max-width: 768px) {
    .app-sidebar {
        width: 80px;
        padding: 1.5rem 0.5rem;
        align-items: center;
    }
    .brand-name, .user-status-card, .sidebar-footer .nav-link span {
        display: none;
    }
    .sidebar-nav .nav-link span {
        display: none;
    }
    .nav-link {
        justify-content: center;
        padding: 0.85rem;
    }
    .main-wrapper {
        margin-left: 80px;
    }
    .main-header {
        padding: 0 1.5rem;
    }
    .content-body {
        padding: 1.5rem;
    }
    .intro-cards {
        grid-template-columns: 1fr;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .course-grid {
        grid-template-columns: 1fr;
    }
    .continue-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    .continue-details {
        max-width: 100%;
    }
}
.card-banner {
    height: 200px;
    width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    position: relative;
    overflow: hidden;
}

@media (max-width: 768px) {
    .card-banner { height: 170px; }
}

@media (max-width: 480px) {
    .card-banner { height: 150px; }
}