:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

.login-card h1 {
    color: var(--gray-900);
    margin-bottom: 5px;
}

.subtitle {
    color: var(--gray-700);
    margin-bottom: 30px;
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: var(--gray-900);
    color: white;
    padding: 20px 0;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--gray-800);
    margin-bottom: 20px;
}

.sidebar-header h1 {
    font-size: 1.25rem;
}

.sidebar-nav a {
    display: block;
    padding: 12px 20px;
    color: var(--gray-300);
    text-decoration: none;
    transition: all 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: var(--gray-800);
    color: white;
}

.sidebar-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    border-top: 1px solid var(--gray-800);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: white;
    padding: 15px 30px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.1);
    margin-bottom: 20px;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.25rem;
}

.card-body {
    padding: 20px;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.1);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

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

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

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

.btn-danger:hover {
    background: #b91c1c;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

/* Media Grid */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.media-item {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.1);
}

.media-item img,
.media-item video {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    background: var(--gray-200);
}

.media-item .info {
    padding: 15px;
}

.media-item .name {
    font-weight: 500;
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.media-item .meta {
    font-size: 12px;
    color: var(--gray-700);
}

.media-item .actions {
    padding: 10px 15px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--gray-300);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: var(--gray-50);
}

/* Sequence Builder */
.sequence-builder {
    display: flex;
    gap: 30px;
}

.sequence-items {
    flex: 1;
}

.media-pool {
    width: 300px;
}

.sequence-item {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    padding: 10px 15px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: move;
}

.sequence-item.dragging {
    opacity: 0.5;
}

.sequence-item .thumbnail {
    width: 60px;
    height: 40px;
    object-fit: cover;
    border-radius: 4px;
}

.sequence-item .info {
    flex: 1;
}

.sequence-item .interval {
    width: 80px;
}

.sequence-item .actions {
    opacity: 0;
    transition: opacity 0.2s;
}

.sequence-item:hover .actions {
    opacity: 1;
}

.pool-item {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.pool-item:hover {
    border-color: var(--primary);
}

.pool-item .thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 10px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 8px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-700);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Utility */
.error {
    color: var(--danger);
    margin-top: 10px;
    font-size: 14px;
}

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

.mt-3 {
    margin-top: 15px;
}

.mb-3 {
    margin-bottom: 15px;
}

.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

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

.gap-2 {
    gap: 10px;
}