:root {
    --bg: #f3f6fb;
    --card: #ffffff;
    --line: #d7dfeb;
    --text: #172033;
    --muted: #667085;
    --primary: #1565c0;
    --primary-soft: #e8f1ff;
    --danger: #c62828;
    --success: #1f8f51;
    --warning: #b36b00;
    --shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

html,
body {
    overflow-x: hidden;
}

body {
    margin: 0;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background:
        radial-gradient(circle at top right, rgba(21, 101, 192, 0.12), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
    word-break: break-all;
}

.page-shell {
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(215, 223, 235, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.topnav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: flex-end;
}

.topnav a,
.topnav .nav-label {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 8px 12px;
    border-radius: 12px;
    background: rgba(232, 241, 255, 0.85);
}

.topnav .nav-label {
    color: var(--muted);
}

.card,
.stats-grid .stat-card,
.login-card {
    background: var(--card);
    border: 1px solid rgba(215, 223, 235, 0.92);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.section-title {
    margin: 0 0 16px;
    font-size: 24px;
    line-height: 1.35;
}

.grid {
    display: grid;
    gap: 18px;
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
    padding: 20px;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
}

.login-card {
    width: 100%;
    max-width: 460px;
    padding: 28px;
}

.muted {
    color: var(--muted);
}

form {
    display: grid;
    gap: 14px;
}

label {
    font-size: 14px;
    font-weight: 600;
}

input,
select,
textarea,
button {
    font: inherit;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="url"],
select,
textarea {
    width: 100%;
    min-height: 46px;
    padding: 11px 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
}

textarea {
    min-height: 120px;
    resize: vertical;
}

button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 0;
    border-radius: 12px;
    padding: 11px 18px;
    cursor: pointer;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    min-height: 46px;
    text-align: center;
}

.btn-secondary {
    background: #eef3fb;
    color: var(--text);
}

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

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

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

.inline-form {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.hero {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 18px;
    margin-bottom: 18px;
}

.menu-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.audio-card {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 18px;
    align-items: start;
}

.audio-card img {
    width: 100%;
    border-radius: 16px;
    object-fit: cover;
    background: #eef3fb;
}

.player-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 12px 0;
}

.player-toolbar button,
.player-toolbar select {
    min-height: 44px;
    flex: 1 1 140px;
}

audio {
    width: 100%;
    margin-top: 8px;
}

.alert {
    padding: 12px 16px;
    border-radius: 14px;
    margin-bottom: 18px;
    border: 1px solid transparent;
}

.alert-success {
    background: #edf9f2;
    border-color: #cfe9da;
    color: #166534;
}

.alert-error {
    background: #fff2f2;
    border-color: #f3cccc;
    color: #991b1b;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 18px;
}

.stat-card {
    padding: 18px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    margin: 8px 0 0;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 12px 10px;
    border-bottom: 1px solid #e6ebf4;
    vertical-align: top;
    text-align: left;
    word-break: break-word;
}

th {
    color: var(--muted);
    font-size: 14px;
}

.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    background: var(--primary-soft);
    color: var(--primary);
}

.badge-danger {
    background: #fff2f2;
    color: var(--danger);
}

.badge-success {
    background: #edf9f2;
    color: var(--success);
}

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

.pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.pagination a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: #fff;
}

.pagination a.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.search-bar,
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-bottom: 18px;
}

.two-col-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.full-col {
    grid-column: 1 / -1;
}

.small {
    font-size: 13px;
}

@media (max-width: 900px) {
    .hero,
    .grid-2,
    .audio-card,
    .stats-grid,
    .two-col-form {
        grid-template-columns: 1fr;
    }

    .topbar {
        padding: 14px 16px;
        align-items: flex-start;
        flex-direction: column;
    }

    .topnav {
        width: 100%;
        justify-content: flex-start;
    }

    .topnav a,
    .topnav .nav-label {
        flex: 1 1 auto;
    }
}

@media (max-width: 680px) {
    .container {
        padding: 16px 12px 32px;
    }

    .card,
    .login-card,
    .stat-card {
        padding: 16px;
        border-radius: 16px;
    }

    .section-title {
        font-size: 20px;
        margin-bottom: 14px;
    }

    .menu-links,
    .table-actions,
    .player-toolbar,
    .toolbar,
    .search-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .menu-links .btn,
    .table-actions .btn,
    .player-toolbar button,
    .player-toolbar select,
    .toolbar .btn,
    .search-bar button,
    .search-bar input,
    .inline-form,
    .inline-form select {
        width: 100%;
    }

    .responsive-table thead {
        display: none;
    }

    .responsive-table,
    .responsive-table tbody,
    .responsive-table tr,
    .responsive-table td {
        display: block;
        width: 100%;
    }

    .responsive-table tr {
        padding: 10px 0;
        border-bottom: 1px solid #e6ebf4;
    }

    .responsive-table td {
        border-bottom: 0;
        padding: 8px 0;
    }

    .responsive-table td::before {
        content: attr(data-label);
        display: block;
        margin-bottom: 4px;
        font-size: 12px;
        font-weight: 700;
        color: var(--muted);
    }

    .pagination a {
        flex: 1 0 44px;
    }
}