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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --bg-hover: #252c35;
    --border-color: #2a313c;
    --accent: #00e5c8;
    --accent-dim: rgba(0, 229, 200, 0.15);
    --accent-glow: rgba(0, 229, 200, 0.3);
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --danger: #f85149;
    --danger-dim: rgba(248, 81, 73, 0.15);
    --warning: #d29922;
    --success: #3fb950;
    --radius: 10px;
    --radius-sm: 6px;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica,
        Arial, sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 229, 200, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 229, 200, 0.04), transparent);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== 顶部 ===== */
.header {
    background: rgba(22, 27, 34, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    flex: 1;
    min-width: 0;
}
.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
    padding: 10px 22px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 999px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}
.tab-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent);
    background: var(--bg-tertiary);
}
.tab-btn.active {
    color: var(--bg-primary);
    background: linear-gradient(135deg, var(--accent), #00b8d4);
    border-color: transparent;
    font-weight: 600;
    box-shadow: 0 4px 16px var(--accent-glow);
}

/* ===== 主内容 ===== */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px 60px;
}

/* 管理员工具栏 */
.admin-toolbar {
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    align-items: center;
}
.admin-toolbar.show { display: flex; }

.toolbar-left {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1;
}
.toolbar-right {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* ===== 按钮 ===== */
.btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}
.btn:hover {
    background: var(--bg-hover);
    border-color: var(--text-muted);
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), #00b8d4);
    color: var(--bg-primary);
    border-color: transparent;
    font-weight: 600;
}
.btn-primary:hover {
    box-shadow: 0 4px 12px var(--accent-glow);
    filter: brightness(1.05);
}
.btn-danger {
    background: var(--danger-dim);
    color: var(--danger);
    border-color: rgba(248, 81, 73, 0.3);
}
.btn-danger:hover {
    background: rgba(248, 81, 73, 0.25);
}
.btn-ghost {
    background: transparent;
}
.btn-sm {
    padding: 5px 12px;
    font-size: 12px;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 表格 ===== */
.table-wrap {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.table-scroll {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

thead {
    background: var(--bg-tertiary);
}

th {
    padding: 14px 20px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

td {
    padding: 14px 20px;
    border-bottom: 1px solid rgba(42, 49, 60, 0.5);
    font-size: 14px;
    color: var(--text-primary);
    vertical-align: middle;
}

tbody tr {
    transition: background 0.15s ease;
}
tbody tr:hover {
    background: var(--bg-hover);
}
tbody tr:last-child td {
    border-bottom: none;
}

.col-num {
    width: 100px;
    color: var(--accent);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.col-player {
    width: 140px;
}
.col-action {
    width: 160px;
}

.song-name {
    font-weight: 500;
}
.artist-name {
    color: var(--text-secondary);
}
.player-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
}

.admin-only { display: none; }
body.is-admin .admin-only { display: table-cell; }
body.is-admin .admin-toolbar { display: flex; }
body.is-admin .admin-only-inline { display: inline-flex !important; }

/* checkbox */
.cb-cell {
    width: 44px;
    text-align: center;
}
.cb-cell input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    gap: 12px;
    flex-wrap: wrap;
}
.page-info {
    font-size: 13px;
    color: var(--text-secondary);
}
.page-btns {
    display: flex;
    gap: 6px;
    align-items: center;
}
.page-btn {
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s;
}
.page-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}
.page-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: transparent;
    font-weight: 600;
}
.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ===== 加载 / 空状态 ===== */
.loading, .empty-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-secondary);
}
.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.modal-overlay.show {
    display: flex;
}
.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}
.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-title {
    font-size: 17px;
    font-weight: 600;
}
.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 22px;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body {
    padding: 24px;
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 18px;
}
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.form-label .req { color: var(--danger); }
.form-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.15s;
}
.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}
textarea.form-input {
    resize: vertical;
    min-height: 80px;
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}
.toast {
    padding: 12px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    max-width: 380px;
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    pointer-events: auto;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--accent); }
.toast.fadeout { animation: slideOut 0.3s ease forwards; }
@keyframes slideIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes slideOut {
    to { opacity: 0; transform: translateX(40px); }
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .header-inner { padding: 10px 16px; gap: 10px; }
    .tab-btn { padding: 7px 14px; font-size: 12px; }
    .main { padding: 14px 16px 40px; }
    th, td { padding: 10px 12px; font-size: 13px; }
    .col-action { width: auto; }
    .admin-toolbar { padding: 12px; }
    .btn { padding: 7px 12px; font-size: 12px; }
    .modal { margin: 10px; }
    .pagination { padding: 12px; }
    .toast-container { top: 12px; right: 12px; left: 12px; }
    .toast { max-width: none; }
}

/* 隐藏文件输入 */
.hidden-file {
    display: none;
}