/* ============================================================
   API Key 用量监控台 - Dark OLED Theme
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    --bg: #070b14;
    --bg-elevated: #0d1424;
    --card: #111a2e;
    --card-border: #1e2a44;
    --card-hover-border: #2e3d5c;

    --text-primary: #e6edf7;
    --text-secondary: #8ba0bf;
    --text-muted: #5a6c8a;

    --blue: #3b82f6;
    --cyan: #38bdf8;
    --green: #34d399;
    --amber: #f59e0b;
    --purple: #a855f7;
    --red: #ef4444;

    --input-bg: #0a1120;
    --input-border: #23314d;
    --input-focus: #3b82f6;

    --radius: 14px;
    --radius-sm: 10px;

    --font-body: "Fira Sans", -apple-system, BlinkMacSystemFont, "Microsoft YaHei", sans-serif;
    --font-mono: "Fira Code", "SF Mono", Consolas, monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background:
        radial-gradient(1200px 600px at 80% -10%, rgba(59, 130, 246, 0.08), transparent 60%),
        radial-gradient(900px 500px at -10% 110%, rgba(56, 189, 248, 0.05), transparent 55%),
        var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.num {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 28px 20px 40px;
}

/* ---------- Header ---------- */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding: 8px 4px;
}

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

.logo {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, #1e40af, #3b82f6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 0 24px rgba(59, 130, 246, 0.35);
    flex-shrink: 0;
}

.logo svg {
    width: 24px;
    height: 24px;
}

.header h1 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.2px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 2px;
}

.header-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--card);
    border: 1px solid var(--card-border);
    padding: 7px 14px;
    border-radius: 999px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px rgba(52, 211, 153, 0.7);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.45; }
}

/* ---------- Cards ---------- */
.card {
    background: linear-gradient(180deg, var(--card), var(--bg-elevated));
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 20px;
    transition: border-color 0.25s ease;
}

.card:hover {
    border-color: var(--card-hover-border);
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}

.section-title h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.chart-hint {
    font-size: 12px;
    color: var(--text-muted);
}

/* ---------- Form ---------- */
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    align-items: flex-end;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.2px;
}

.form-group label svg {
    width: 14px;
    height: 14px;
    opacity: 0.8;
}

.form-group input[type="date"],
.form-group select {
    padding: 9px 12px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13.5px;
    min-width: 140px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.form-group input[type="date"]:hover,
.form-group select:hover {
    border-color: #33466b;
}

.form-group input[type="date"]:focus,
.form-group select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18);
}

/* 日期选择器图标（深色适配） */
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.7);
    cursor: pointer;
}

select option {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.btn-group {
    margin-left: auto;
    flex-direction: row;
    gap: 12px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, opacity 0.2s;
}

.btn svg {
    width: 16px;
    height: 16px;
}

.btn:active {
    transform: scale(0.96);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

.btn:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
}

.btn-primary {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
    box-shadow: 0 2px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.5);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--cyan);
    border: 1.5px solid rgba(56, 189, 248, 0.4);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--cyan);
}

/* 加载按钮转圈 */
.btn.loading svg {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Error ---------- */
.error-box {
    background: rgba(239, 68, 68, 0.08);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    padding: 13px 16px;
    margin-bottom: 20px;
    font-size: 13.5px;
}

.hidden {
    display: none !important;
}

/* ---------- Summary Cards ---------- */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: linear-gradient(180deg, var(--card), var(--bg-elevated));
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 18px 20px;
    transition: transform 0.2s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--card-hover-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 22px;
    height: 22px;
}

.icon-blue   { background: rgba(59, 130, 246, 0.14); color: var(--blue); }
.icon-cyan   { background: rgba(56, 189, 248, 0.14); color: var(--cyan); }
.icon-green  { background: rgba(52, 211, 153, 0.14); color: var(--green); }
.icon-amber  { background: rgba(245, 158, 11, 0.14); color: var(--amber); }
.icon-purple { background: rgba(168, 85, 247, 0.14); color: var(--purple); }

.stat-label {
    font-size: 12.5px;
    color: var(--text-secondary);
    margin-bottom: 5px;
    letter-spacing: 0.2px;
}

.unit-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
}

.stat-card.stat-cost .stat-value {
    color: var(--purple);
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-cache {
    font-size: 17px;
    color: var(--cyan);
}

/* ---------- Chart ---------- */
.chart-wrap {
    position: relative;
    height: 320px;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    min-width: 900px;
}

thead th {
    background: var(--bg-elevated);
    padding: 12px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 12.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--card-border);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid rgba(30, 42, 68, 0.6);
    color: var(--text-primary);
    white-space: nowrap;
}

tbody tr {
    transition: background 0.15s ease;
}

tbody tr:hover {
    background: rgba(59, 130, 246, 0.06);
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr.total-row {
    background: rgba(59, 130, 246, 0.1);
    font-weight: 600;
    color: var(--text-primary);
}

tbody tr.total-row:hover {
    background: rgba(59, 130, 246, 0.14);
}

th.num, td.num {
    text-align: right;
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

td.cost-col, th.cost-col {
    color: var(--purple);
    font-weight: 600;
}

tbody tr.total-row td.cost-col {
    color: var(--purple);
    font-size: 15px;
}

td.model-cell {
    color: var(--cyan);
}

td.empty-cell {
    text-align: center;
    color: var(--text-muted);
    padding: 32px;
    font-size: 14px;
}

/* ---------- Footer ---------- */
.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    padding: 18px 0 6px;
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .container { padding: 20px 14px 32px; }
    .header { flex-direction: column; align-items: flex-start; }
    .header-badge { align-self: flex-start; }
    .btn-group { margin-left: 0; width: 100%; }
    .btn { flex: 1; justify-content: center; }
    .form-row { gap: 14px; }
    .form-group input[type="date"], .form-group select { width: 100%; min-width: 100%; }
    .form-group { flex: 1 1 45%; }
    .stat-value { font-size: 20px; }
    .chart-wrap { height: 240px; }
}

@media (max-width: 480px) {
    .form-group { flex: 1 1 100%; }
    .summary-grid { grid-template-columns: 1fr 1fr; }
    .stat-card { padding: 14px 16px; gap: 10px; }
    .stat-value { font-size: 17px; }
}