@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    --bg: #d8d4cc;
    --surface: #e0dbd4;
    --card: #eae6df;
    --text: #1c2830;
    --muted: #687880;
    --accent: #3a7a6e;
    --accent-fg: #ffffff;
    --accent-hover: #2f6459;
    --border: #c5c0b8;
    --danger: #b93c32;
    --danger-fg: #ffffff;
    --success: #2a7a50;
    --warning-bg: #f0ece0;
    --warning-text: #7a5c28;
    --shadow: 0 2px 8px rgba(0,0,0,0.10);
    --radius: 10px;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #1a2028;
        --surface: #232c35;
        --card: #2c3640;
        --text: #e4e0d8;
        --muted: #8898a0;
        --accent: #4a9a88;
        --accent-hover: #5aaa98;
        --border: #38444e;
        --danger: #e05050;
        --success: #3aaa70;
        --warning-bg: #2a2818;
        --warning-text: #c8a050;
        --shadow: 0 2px 8px rgba(0,0,0,0.30);
    }
}
:root[data-theme="dark"] {
    --bg: #1a2028;
    --surface: #232c35;
    --card: #2c3640;
    --text: #e4e0d8;
    --muted: #8898a0;
    --accent: #4a9a88;
    --accent-hover: #5aaa98;
    --border: #38444e;
    --danger: #e05050;
    --success: #3aaa70;
    --warning-bg: #2a2818;
    --warning-text: #c8a050;
    --shadow: 0 2px 8px rgba(0,0,0,0.30);
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Footer ── */
footer {
    text-align: center;
    font-size: 12px;
    color: var(--muted);
    padding: 32px 16px 24px;
    line-height: 1.8;
}
footer a { color: var(--muted); text-decoration: underline; }

/* ── Nav ── */
nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
    gap: 12px;
}
.site-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    letter-spacing: -0.01em;
}
.site-name:hover { text-decoration: none; }
.nav-links {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    flex-wrap: wrap;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent); font-weight: 500; }
.nav-user { color: var(--muted); font-size: 13px; }

/* ── Layout ── */
main {
    max-width: 520px;
    margin: 36px auto;
    padding: 0 16px 60px;
}
main.wide { max-width: 900px; }

/* ── Card ── */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}

/* ── Typography ── */
h1 { font-size: 20px; font-weight: 600; margin: 0 0 4px; text-wrap: balance; }
h2 { font-size: 17px; font-weight: 600; margin: 0 0 14px; }
.page-subtitle { color: var(--muted); font-size: 13px; margin: 0 0 22px; }

/* ── Forms ── */
.form-group { margin-bottom: 14px; }
label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
    margin-bottom: 5px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}
input[type="text"],
input[type="password"],
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 15px;
    transition: border-color 0.15s, box-shadow 0.15s;
    appearance: none;
    -webkit-appearance: none;
}
input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(58,122,110,0.14);
}
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    cursor: pointer;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, filter 0.15s, opacity 0.15s;
    white-space: nowrap;
    text-decoration: none;
}
.btn-block { width: 100%; }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--surface); color: var(--text); text-decoration: none; }
.btn-danger { background: var(--danger); color: var(--danger-fg); font-size: 13px; padding: 6px 14px; }
.btn-danger:hover { filter: brightness(1.1); text-decoration: none; }
.btn-sm { padding: 5px 12px; font-size: 13px; }

/* ── Tabs ── */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 22px;
}
.tab-btn {
    flex: 1;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 10px 8px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    margin-bottom: -1px;
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Alerts ── */
.alert {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 14px;
    line-height: 1.5;
    display: none;
}
.alert.show { display: block; }
.alert-error { background: rgba(185,60,50,0.12); color: var(--danger); border: 1px solid rgba(185,60,50,0.2); }
.alert-success { background: rgba(42,122,80,0.12); color: var(--success); border: 1px solid rgba(42,122,80,0.2); }
.alert-warning { background: var(--warning-bg); color: var(--warning-text); border: 1px solid rgba(122,92,40,0.15); display: block; }
.alert-info { background: rgba(58,122,110,0.10); color: var(--accent); border: 1px solid rgba(58,122,110,0.2); display: block; }

/* ── Divider ── */
hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── Table ── */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th {
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
}
td { padding: 10px 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--surface); }

/* ── Badge ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}
.badge-green { background: rgba(42,122,80,0.14); color: var(--success); }
.badge-gray { background: rgba(100,100,100,0.12); color: var(--muted); }
.badge-orange { background: rgba(180,100,30,0.14); color: var(--warning-text); }

/* ── Floorplan ── */
.floorplan-container {
    position: relative;
    overflow-x: auto;
    border-radius: 8px;
    background: var(--surface);
}
.floorplan-wrap {
    position: relative;
    min-width: 600px;
}
.floorplan-wrap img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
}
#marker-svg,
#book-marker-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* ── Legend ── */
.legend {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--muted);
    margin-top: 10px;
    flex-wrap: wrap;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}
.legend-dot {
    width: 12px; height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}
.legend-dot-assigned { background: var(--accent); }
.legend-dot-unassigned { background: #999; opacity: 0.5; }

/* ── Refresh indicator ── */
.refresh-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--success);
    display: inline-block;
    animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

/* ── Stat grid ── */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    text-align: center;
}
.stat-num {
    font-size: 28px;
    font-weight: 600;
    line-height: 1;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

@media (max-width: 480px) {
    main { margin-top: 20px; }
    .card { padding: 18px; }
}