:root {
    --bg: #0a0a0e;
    --bg-card: #12121a;
    --bg-hover: #1a1a24;
    --border: #2a2a36;
    --text: #e8e8ec;
    --text-secondary: #8a8a94;
    --accent: #00e0c6;
    --accent-glow: rgba(0, 224, 198, 0.15);
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.hidden { display: none !important; }

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at 30% 20%, rgba(0, 224, 198, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
                var(--bg);
}

.login-box {
    width: 400px;
    padding: 48px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
}

.login-logo {
    color: var(--accent);
    margin-bottom: 20px;
}

.login-box h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-box .form-group {
    margin-bottom: 20px;
}

.login-box input[type="password"] {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s;
}

.login-box input:focus {
    border-color: var(--accent);
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 224, 198, 0.3);
}

.login-hint {
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 12px;
    opacity: 0.5;
}

.admin-page {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
}

.sidebar-nav {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s, color 0.15s;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
}

.btn-logout {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
    transition: border-color 0.2s, color 0.2s;
}

.btn-logout:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.top-bar {
    height: 64px;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.breadcrumb .sep { opacity: 0.5; }
.breadcrumb .current { color: var(--text); }

.admin-status {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 13px;
}

.admin-status .status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
}

.page-content {
    padding: 32px;
    flex: 1;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 24px;
}

.content-header h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 4px;
}

.content-header p {
    color: var(--text-secondary);
    font-size: 13px;
}

.btn-primary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 224, 198, 0.25);
}

.btn-secondary {
    padding: 10px 20px;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.2s;
}

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

.btn-danger {
    padding: 10px 20px;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-danger:hover { opacity: 0.9; }

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s;
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.project-thumb {
    position: relative;
    height: 180px;
    background: var(--bg) linear-gradient(135deg, #1a1a2a, #0f0f18);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-thumb .no-image {
    color: var(--text-muted);
    font-size: 13px;
}

.project-thumb .badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 10px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    border-radius: 6px;
    font-size: 11px;
    color: var(--text-secondary);
}

.project-thumb .video-indicator {
    position: absolute;
    bottom: 10px;
    right: 10px;
    padding: 4px 10px;
    background: var(--accent);
    color: #000;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
}

.project-body {
    padding: 16px;
}

.project-body h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.project-body .cat {
    font-size: 12px;
    color: var(--accent);
    margin-bottom: 10px;
}

.project-body .desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.project-tags span {
    padding: 3px 10px;
    background: var(--accent-glow);
    color: var(--accent);
    border-radius: 4px;
    font-size: 11px;
}

.project-actions {
    display: flex;
    gap: 8px;
}

.project-actions button {
    flex: 1;
    padding: 8px;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s;
}

.project-actions .btn-edit:hover { background: rgba(0, 224, 198, 0.1); border-color: var(--accent); color: var(--accent); }
.project-actions .btn-delete:hover { background: rgba(239, 68, 68, 0.1); border-color: var(--danger); color: var(--danger); }

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 680px;
    max-width: calc(100vw - 40px);
    max-height: calc(100vh - 40px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-content.small {
    width: 400px;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.15s;
}

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

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.form-section {
    margin-bottom: 18px;
}

.form-section label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-section label .required {
    color: var(--danger);
}

.form-section input[type="text"],
.form-section input[type="number"],
.form-section input[type="url"],
.form-section textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.form-section input:focus,
.form-section textarea:focus {
    border-color: var(--accent);
}

.form-section textarea {
    resize: vertical;
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .half {
    flex: 1;
}

.upload-area {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    background: var(--bg);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.upload-placeholder {
    color: var(--text-muted);
}

.upload-placeholder svg {
    margin-bottom: 12px;
    color: var(--text-muted);
}

.upload-placeholder p {
    font-size: 14px;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.upload-placeholder .hint {
    font-size: 12px;
    opacity: 0.6;
}

.preview-img,
.preview-video {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    display: block;
    margin: 0 auto;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.form-actions button {
    min-width: 100px;
}

.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    z-index: 2000;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideDown 0.3s ease;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

@keyframes slideDown {
    from { transform: translate(-50%, -20px); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

.empty-state {
    grid-column: 1 / -1;
    padding: 80px 40px;
    text-align: center;
    color: var(--text-muted);
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 14px;
}

.video-list {
    margin-top: 12px;
}

.video-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-secondary);
}

.btn-clear {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-clear:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.video-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}

.video-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg);
    border: 1px solid var(--border);
}

.video-item .video-thumb {
    width: 100%;
    height: 90px;
    object-fit: cover;
    display: block;
    cursor: pointer;
    background: #000;
}

.video-item .video-thumb:hover {
    opacity: 0.85;
}

.video-item .video-remove {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    color: #fff;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.video-item .video-remove:hover {
    background: var(--danger);
}

.video-item .video-index {
    position: absolute;
    bottom: 6px;
    left: 6px;
    padding: 2px 8px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 4px;
    font-size: 11px;
    color: var(--text-secondary);
}

.external-url-section {
    margin-top: 16px;
    padding: 16px;
    background: rgba(0, 224, 198, 0.05);
    border: 1px dashed rgba(0, 224, 198, 0.3);
    border-radius: 8px;
}

.external-url-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
}

.external-url-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.external-url-area textarea {
    width: 100%;
    min-height: 100px;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 13px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    line-height: 1.6;
    outline: none;
    resize: vertical;
    transition: border-color 0.2s;
}

.external-url-area textarea:focus {
    border-color: var(--accent);
}

.external-url-area textarea::placeholder {
    color: var(--text-secondary);
    font-family: inherit;
}

.btn-add-url {
    align-self: flex-end;
    padding: 10px 20px;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.btn-add-url:hover {
    background: #00ffdd;
}

.external-url-section .hint {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.video-item.external-video {
    border: 1px solid rgba(0, 224, 198, 0.4);
    background: rgba(0, 224, 198, 0.05);
}

.video-item.external-video::after {
    content: '外部链接';
    position: absolute;
    top: 4px;
    right: 4px;
    padding: 2px 6px;
    background: var(--accent);
    color: #000;
    border-radius: 3px;
    font-size: 9px;
    font-weight: 600;
}

.video-item.external-video .video-thumb {
    object-fit: cover;
}

.video-url-tooltip {
    position: absolute;
    bottom: 22px;
    left: 4px;
    right: 4px;
    padding: 3px 6px;
    background: rgba(0, 0, 0, 0.75);
    border-radius: 3px;
    font-size: 9px;
    color: var(--accent);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
}

.video-item {
    position: relative;
}

@media (max-width: 768px) {
    .sidebar {
        width: 64px;
    }
    .sidebar-header span,
    .nav-item span:not(.icon),
    .sidebar-footer {
        display: none;
    }
    .nav-item {
        justify-content: center;
    }
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    .projects-grid {
        grid-template-columns: 1fr;
    }
}