/* ---------- design tokens ---------- */

:root {
    --bg: #fafafa;
    --bg-elevated: #fff;
    --bg-sidebar: #1f2329;
    --bg-sidebar-hover: #2a2f37;
    --bg-sidebar-active: #0b66ff;
    --bg-input: #fff;
    --border: #e5e7eb;
    --border-strong: #d1d5db;
    --text: #1f2329;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --text-inverse: #f5f6f8;
    --text-inverse-muted: #9aa2b1;
    --accent: #0b66ff;
    --accent-hover: #0a5fe8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --warn: #d97706;
    --success: #047857;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --radius: 6px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', Menlo, Monaco, monospace;
    --sidebar-width: 220px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #16181c;
        --bg-elevated: #1f2329;
        --bg-sidebar: #0d0f12;
        --bg-sidebar-hover: #1a1d22;
        --bg-input: #2a2f37;
        --border: #2a2f37;
        --border-strong: #3a4049;
        --text: #f5f6f8;
        --text-secondary: #9aa2b1;
        --text-tertiary: #6a7280;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    }
}

/* ---------- reset ---------- */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
    font-family: var(--font);
    font-size: 14px;
    line-height: 1.45;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
button { font: inherit; }
input, textarea, select { font: inherit; color: inherit; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: 0; border-top: 1px solid var(--border); margin: 16px 0; }

#app { min-height: 100vh; }

/* ---------- login screen ---------- */

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: var(--bg);
    padding: 24px;
}
.login-card {
    width: 100%;
    max-width: 360px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    box-shadow: var(--shadow);
}
.login-card h1 {
    margin: 0 0 4px 0;
    font-size: 20px;
    font-weight: 600;
}
.login-card .muted {
    color: var(--text-secondary);
    margin: 0 0 24px 0;
    font-size: 13px;
}
.login-card label {
    display: block;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}
.login-card label span {
    display: block;
    margin-bottom: 4px;
}

/* ---------- form controls ---------- */

input[type="text"], input[type="email"], input[type="password"], input[type="number"], textarea, select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(11, 102, 255, 0.15);
}
textarea { resize: vertical; min-height: 80px; font-family: var(--font); }

button {
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius);
    padding: 8px 14px;
    background: var(--accent);
    color: #fff;
    font-weight: 500;
    transition: background-color 0.15s;
}
button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: not-allowed; }
button.secondary {
    background: var(--bg-elevated);
    color: var(--text);
    border-color: var(--border-strong);
}
button.secondary:hover { background: var(--bg); }
button.danger { background: var(--danger); }
button.danger:hover { background: var(--danger-hover); }
button.small { padding: 4px 8px; font-size: 12px; }

.form-error {
    color: var(--danger);
    font-size: 13px;
    margin-top: 8px;
}

/* ---------- main shell ---------- */

.shell { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    color: var(--text-inverse);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}
.sidebar .brand {
    padding: 18px 20px;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: -0.01em;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    gap: 8px;
}
.sidebar nav { flex: 1; padding: 12px 8px; }
.sidebar nav a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    margin-bottom: 2px;
    border-radius: var(--radius);
    color: var(--text-inverse-muted);
    transition: background-color 0.15s, color 0.15s;
}
.sidebar nav a:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-inverse);
    text-decoration: none;
}
.sidebar nav a.active {
    background: var(--bg-sidebar-active);
    color: #fff;
}
.sidebar nav a .badge {
    font-size: 11px;
    background: rgba(255, 255, 255, 0.12);
    padding: 1px 6px;
    border-radius: 9999px;
}
.sidebar nav a.active .badge { background: rgba(255, 255, 255, 0.22); }

.sidebar .footer {
    padding: 12px 16px;
    font-size: 12px;
    color: var(--text-inverse-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.sidebar .footer .who { color: var(--text-inverse); margin-bottom: 6px; }
.sidebar .footer button.signout {
    width: 100%;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--text-inverse-muted);
}
.sidebar .footer button.signout:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-inverse);
}

.main {
    flex: 1;
    min-width: 0;
    padding: 24px 32px;
    overflow-x: auto;
}
.main h1 { font-size: 20px; font-weight: 600; margin: 0 0 4px 0; }
.main .subtitle { color: var(--text-secondary); margin: 0 0 20px 0; }
.toolbar {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.toolbar input[type="text"], .toolbar select { max-width: 320px; }
.toolbar .spacer { flex: 1; }

/* ---------- dashboard cards ---------- */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    box-shadow: var(--shadow-sm);
}
.card h3 {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0 0 6px 0;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.card .value { font-size: 24px; font-weight: 600; }
.card .sub {
    color: var(--text-tertiary);
    font-size: 12px;
    margin-top: 4px;
}

/* ---------- tables ---------- */

.table-wrap {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}
th {
    background: var(--bg);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr.clickable { cursor: pointer; }
tbody tr.clickable:hover { background: var(--bg); }

td.mono, .mono { font-family: var(--font-mono); font-size: 12px; }
td.muted, .muted-cell { color: var(--text-secondary); }
td.actions { text-align: right; }

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

/* ---------- pagination ---------- */

.pagination {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    color: var(--text-secondary);
    font-size: 13px;
}

/* ---------- status pills ---------- */

.pill {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 500;
    background: var(--border);
    color: var(--text);
}
.pill.open { background: rgba(11, 102, 255, 0.12); color: var(--accent); }
.pill.waiting { background: rgba(217, 119, 6, 0.14); color: var(--warn); }
.pill.closed { background: rgba(107, 114, 128, 0.16); color: var(--text-secondary); }
.pill.tier-pro { background: rgba(124, 58, 237, 0.14); color: #7c3aed; }
.pill.tier-plus { background: rgba(11, 102, 255, 0.12); color: var(--accent); }
.pill.tier-free { background: rgba(107, 114, 128, 0.16); color: var(--text-secondary); }

/* ---------- detail panes ---------- */

.detail {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 16px;
}
.detail h2 {
    margin: 0 0 12px 0;
    font-size: 16px;
    font-weight: 600;
}
.detail h3 {
    margin: 16px 0 8px 0;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.dl { display: grid; grid-template-columns: 160px 1fr; row-gap: 6px; column-gap: 12px; }
.dl dt { color: var(--text-secondary); font-size: 13px; }
.dl dd { margin: 0; font-size: 13px; }

.message {
    padding: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 8px;
}
.message .head {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}
.message .body {
    white-space: pre-wrap;
    font-size: 13px;
}
.message.from-user { border-left: 3px solid var(--accent); }
.message.from-operator {
    border-left: 3px solid var(--success);
    background: rgba(4, 120, 87, 0.04);
}

.bundle {
    margin-top: 8px;
    padding: 8px;
    background: var(--bg-elevated);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 11px;
    white-space: pre;
    max-height: 220px;
    overflow: auto;
    color: var(--text-secondary);
}

.toast {
    position: fixed;
    bottom: 16px;
    right: 16px;
    background: var(--text);
    color: var(--bg-elevated);
    padding: 10px 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-size: 13px;
    animation: slideIn 0.2s ease-out;
}
.toast.error { background: var(--danger); color: #fff; }
@keyframes slideIn {
    from { transform: translateY(8px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 720px) {
    .shell { flex-direction: column; }
    .sidebar { width: 100%; }
    .sidebar nav { display: flex; flex-wrap: wrap; gap: 4px; }
    .main { padding: 16px; }
    .dl { grid-template-columns: 1fr; }
    .dl dt { font-weight: 500; }
}