:root {
    /* Òptim Acadèmia Neutral Theme */
    --primary-navy: #0b1a30;
    --primary-navy-light: #1e293b;
    --primary-accent: #2563eb;
    --primary-accent-hover: #1d4ed8;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-light: #e2e8f0;

    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;

    /* Shadows & Radius */
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 16px -6px rgba(15, 23, 42, 0.08);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
}

h1, h2, h3, h4, .brand-text {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
}

/* Header */
#main-header {
    background-color: var(--primary-navy);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    font-size: 1.8rem;
    color: #60a5fa;
}

.brand-text {
    font-size: 1.3rem;
    letter-spacing: -0.5px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    font-size: 0.85rem;
    color: #cbd5e1;
    display: flex;
    align-items: center;
    gap: 6px;
}

.user-info i {
    font-size: 1.1rem;
}

/* Common Layouts */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    width: 100%;
    min-height: calc(100vh - 80px);
}

/* Cards */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    margin-bottom: var(--spacing-lg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
    border: none;
    border-radius: var(--radius-sm);
    padding: 10px 18px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-accent);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    color: var(--text-dark);
}

.btn-danger {
    background-color: var(--error);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-warning {
    background-color: var(--warning);
    color: white;
}

.btn-warning:hover {
    background-color: #d97706;
}

.btn-outline-warning {
    background-color: transparent;
    color: var(--warning);
    border: 1px solid var(--warning);
}

.btn-outline-warning:hover {
    background-color: var(--warning-light);
    color: #b45309;
}

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

.btn-success:hover {
    background-color: #059669;
}

.btn-outline-success {
    background-color: transparent;
    color: var(--success);
    border: 1px solid var(--success);
}

.btn-outline-success:hover {
    background-color: var(--success-light);
    color: #047857;
}

.btn-outline-primary {
    background-color: transparent;
    color: var(--primary-accent);
    border: 1px solid var(--primary-accent);
}

.btn-outline-primary:hover {
    background-color: #eff6ff;
    color: var(--primary-accent-hover);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.full-width {
    width: 100%;
}

/* Login Page Styling */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 160px);
}

.login-card {
    max-width: 440px;
    width: 100%;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(226, 232, 240, 0.8);
    box-shadow: var(--shadow-lg);
    background: white;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.login-header i {
    font-size: 3rem;
    color: var(--primary-accent);
    margin-bottom: var(--spacing-sm);
}

.login-header h2 {
    font-size: 1.6rem;
    color: var(--primary-navy);
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* Alert Boxes */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-danger {
    background-color: var(--error-light);
    color: #b91c1c;
    border: 1px solid #fca5a5;
}

.alert-success {
    background-color: var(--success-light);
    color: #047857;
    border: 1px solid #6ee7b7;
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-navy-light);
}

input, select, textarea {
    font-family: inherit;
    font-size: 0.95rem;
    padding: 10px 14px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: var(--bg-white);
    color: var(--text-dark);
    width: 100%;
    transition: all 0.2s ease;
    outline: none;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Video Grid and Card */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: var(--spacing-md);
}

.video-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.video-thumbnail i.play-btn-overlay {
    font-size: 3rem;
    opacity: 0.7;
    transition: all 0.3s ease;
    z-index: 2;
}

.video-card:hover .video-thumbnail i.play-btn-overlay {
    opacity: 1;
    transform: scale(1.1);
}

.video-thumbnail-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    transition: transform 0.3s ease;
}

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

.video-thumbnail-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, rgba(15,23,42,0.4) 100%);
    z-index: 1;
}

.video-details {
    padding: var(--spacing-md) 0 0 0;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.video-title {
    font-size: 1rem;
    color: var(--primary-navy);
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.4;
}

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

.status-badge {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.status-converted {
    background-color: var(--success-light);
    color: #047857;
}

.status-pending {
    background-color: var(--warning-light);
    color: #b45309;
}

.status-converting {
    background-color: #dbeafe;
    color: #1d4ed8;
}

.status-error {
    background-color: var(--error-light);
    color: #b91c1c;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    max-width: 900px;
    width: 95%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-container {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-light);
}

.modal-title {
    font-size: 1.1rem;
    color: var(--primary-navy);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text-dark);
}

.modal-body {
    padding: var(--spacing-md);
    background: #000;
    aspect-ratio: 16/9;
}

.modal-body video {
    width: 100%;
    height: 100%;
    outline: none;
}

/* Admin Dashboard Layout */
.admin-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 768px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    background: transparent;
    text-align: left;
    font-size: 0.95rem;
}

.sidebar-item:hover, .sidebar-item.active {
    background-color: #e2e8f0;
    color: var(--primary-navy);
}

.sidebar-item.active {
    font-weight: 600;
    background-color: var(--primary-navy);
    color: white;
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
}

table.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

table.admin-table th {
    background-color: var(--bg-light);
    color: var(--primary-navy);
    font-weight: 600;
    padding: 12px var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

table.admin-table td {
    padding: 12px var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

table.admin-table tr:last-child td {
    border-bottom: none;
}

table.admin-table tr:hover td {
    background-color: #f8fafc;
}

/* File Upload drag area */
.drag-area {
    border: 2px dashed #cbd5e1;
    background-color: #f8fafc;
    border-radius: var(--radius-md);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.drag-area:hover, .drag-area.dragover {
    border-color: var(--primary-accent);
    background-color: #eff6ff;
}

.drag-area i {
    font-size: 3rem;
    color: var(--text-muted);
}

.drag-area-text {
    font-weight: 500;
    color: var(--text-dark);
}

.drag-area-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.hidden-file-input {
    display: none;
}