:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface2: #f1f5f9;
    --border: rgba(15,23,42,.1);
    --text: #1e293b;
    --muted: #64748b;
    --accent: #4f46e5;
    --green: #10b981;
}

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

body {
    font-family: "Noto Sans TC", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* 主版面 */
main {
    max-width: 1280px;
    margin: auto;
    padding: 32px 24px;
}

.layout {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 24px;
}

/* 左側篩選器 */
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px;
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
}

.filter-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
}

.filter-group {
    margin-bottom: 24px;
}

    .filter-group h3 {
        font-size: 14px;
        color: var(--muted);
        margin-bottom: 12px;
    }

.range-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

    .range-row input {
        width: 100%;
        padding: 12px;
        border: 1px solid var(--border);
        border-radius: 12px;
        background: var(--surface2);
    }

/* 篩選按鈕 pill */
.pill-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pill {
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    padding: 9px 13px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 14px;
}

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

    .pill.active {
        background: var(--accent);
        color: #fff;
        border-color: var(--accent);
    }

    .pill.disabled,
    .pill:disabled {
        cursor: not-allowed;
        opacity: .45;
        color: var(--muted);
        border-color: var(--border);
        background: #e2e8f0;
    }

.clear-btn {
    width: 100%;
    border: none;
    background: var(--surface2);
    color: var(--muted);
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
}

/* 右側結果 */
.result-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px;
    box-shadow: 0 14px 34px rgba(15, 23, 42, .06);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

    .result-header h2 {
        font-size: 22px;
    }

.result-heading {
    display: grid;
    gap: 4px;
}

.result-count {
    color: var(--muted);
    font-size: 14px;
}

.result-tools {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 14px;
}

.page-size-select {
    min-width: 104px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface2);
    color: var(--text);
    padding: 9px 32px 9px 12px;
    font: inherit;
    cursor: pointer;
}

/* 表格 */
.table-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: auto;
}

.room-table {
    width: 100%;
    min-width: 820px;
    border-collapse: collapse;
}

    .room-table th,
    .room-table td {
        padding: 14px 16px;
        border-bottom: 1px solid var(--border);
        text-align: left;
        font-size: 14px;
    }

    .room-table th {
        background: var(--surface2);
        font-weight: 700;
        white-space: nowrap;
    }

    /* 級別欄加寬，容納「研討P+輔導教室」等長型別名 */
    .room-table th:nth-child(3),
    .room-table td:nth-child(3) {
        min-width: 140px;
        white-space: nowrap;
    }

        /* 可排序欄位 */
        .room-table th.sortable {
            cursor: pointer;
            user-select: none;
        }

            .room-table th.sortable:hover {
                color: var(--accent);
            }

.sort-icon {
    margin-left: 6px;
    font-size: 12px;
    color: var(--muted);
}

.room-table tr:hover td {
    background: rgba(79,70,229,.04);
}

.room-link {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}

    .room-link:hover {
        text-decoration: underline;
    }

/* ─── FOOTER ─── */
footer {
    text-align: center;
    padding: 24px;
    color: var(--muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
    letter-spacing: 0.05em;
}

.tag {
    display: inline-block;
    background: var(--surface2);
    color: var(--muted);
    padding: 5px 8px;
    border-radius: 8px;
    font-size: 12px;
    margin: 2px;
}

.table-empty {
    text-align: center;
    color: var(--muted);
    padding: 32px;
}

.pagination-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 14px;
    color: var(--muted);
    font-size: 14px;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.page-btn {
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
}

    .page-btn:hover:not(:disabled) {
        border-color: var(--accent);
        color: var(--accent);
    }

    .page-btn:disabled {
        cursor: not-allowed;
        opacity: .45;
    }

.page-indicator {
    min-width: 56px;
    text-align: center;
    color: var(--text);
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .result-tools,
    .pagination-controls {
        width: 100%;
    }

    .page-size-select,
    .page-btn {
        flex: 1;
    }
}