/* ------------------------------------------------------------------
   HTML Host - giao diện quản trị
------------------------------------------------------------------ */
:root {
    --bg: #f4f6fb;
    --panel: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --muted: #64748b;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --ok: #16a34a;
    --warn: #d97706;
    --danger: #dc2626;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .04);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

/* ---------- Layout ---------- */
.topbar {
    background: #0f172a;
    color: #e2e8f0;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 22px;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 20;
}
.topbar .brand { font-weight: 700; color: #fff; font-size: 16px; }
.topbar nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.topbar nav a {
    color: #cbd5e1;
    padding: 7px 12px;
    border-radius: 7px;
    font-size: 14px;
}
.topbar nav a:hover { background: #1e293b; color: #fff; text-decoration: none; }
.topbar nav a.active { background: var(--primary); color: #fff; }
.topbar .who { font-size: 13px; color: #94a3b8; white-space: nowrap; }
.topbar .who a { color: #fca5a5; }

.wrap { max-width: 1140px; margin: 26px auto 60px; padding: 0 20px; }

.page-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.page-head h1 { margin: 0 0 4px; font-size: 22px; }
.page-head p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Card ---------- */
.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 18px;
}
.card > h2 {
    margin: 0;
    padding: 14px 18px;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}
.card-body { padding: 18px; }
.card-body > :first-child { margin-top: 0; }
.card-body > :last-child { margin-bottom: 0; }

.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

/* ---------- Stat ---------- */
.stat {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.stat .value { font-size: 26px; font-weight: 700; margin-top: 4px; }

/* ---------- Form ---------- */
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.hint { color: var(--muted); font-size: 12.5px; margin-top: 5px; font-weight: 400; }

input[type=text], input[type=email], input[type=password], input[type=number],
input[type=url], select, textarea {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font: inherit;
    background: #fff;
    color: var(--text);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}
textarea { min-height: 84px; resize: vertical; }
input[type=file] { font: inherit; }
.field { margin-bottom: 15px; }
.row { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; }
.check input { width: auto; margin: 0; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 15px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: var(--primary);
    color: #fff;
    font: inherit;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; color: #fff; }
.btn.ghost { background: #fff; border-color: #cbd5e1; color: var(--text); }
.btn.ghost:hover { background: #f1f5f9; color: var(--text); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b91c1c; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ---------- Alert ---------- */
.alert {
    padding: 11px 14px;
    border-radius: 8px;
    margin-bottom: 14px;
    font-size: 14px;
    border: 1px solid;
}
.alert.ok { background: #f0fdf4; border-color: #bbf7d0; color: #14532d; }
.alert.err { background: #fef2f2; border-color: #fecaca; color: #7f1d1d; }
.alert.warn { background: #fffbeb; border-color: #fde68a; color: #78350f; }
.alert ul { margin: 6px 0 0; padding-left: 18px; }

/* ---------- Table ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); background: #f8fafc; }
tbody tr:hover { background: #f8fafc; }
td.actions { text-align: right; white-space: nowrap; }
.table-wrap { overflow-x: auto; }

/* ---------- Badge & code ---------- */
.badge {
    display: inline-block;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.badge-ok { background: #dcfce7; color: #166534; }
.badge-warn { background: #fef3c7; color: #92400e; }
.badge-muted { background: #e2e8f0; color: #475569; }
.badge-danger { background: #fee2e2; color: #991b1b; }

code, .mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px;
}
code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 5px;
    word-break: break-all;
}
pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: 14px 16px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
}

.copybox {
    display: flex;
    gap: 8px;
    align-items: center;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
}
.copybox input {
    border: none;
    background: transparent;
    padding: 0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px;
}
.copybox input:focus { box-shadow: none; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.empty { text-align: center; padding: 40px 20px; color: var(--muted); }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--border); padding: 0 18px; }
.tabs button {
    border: none;
    background: none;
    padding: 12px 12px;
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
}
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }
.pane { display: none; }
.pane.active { display: block; }

.bars { display: flex; align-items: flex-end; gap: 4px; height: 90px; }
.bars div { flex: 1; background: #bfdbfe; border-radius: 3px 3px 0 0; min-height: 2px; position: relative; }
.bars div span {
    position: absolute;
    bottom: -18px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 10px;
    color: var(--muted);
}

/* ---------- Auth ---------- */
.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 18px;
    background: linear-gradient(135deg, #1e293b, #0f172a);
}
.auth-box {
    width: 100%;
    max-width: 400px;
    background: #fff;
    border-radius: 14px;
    padding: 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, .35);
}
.auth-box h1 { margin: 0 0 4px; font-size: 21px; }
.auth-box .sub { color: var(--muted); font-size: 14px; margin: 0 0 22px; }
.auth-box .btn { width: 100%; justify-content: center; }
.auth-foot { text-align: center; margin-top: 18px; font-size: 14px; color: var(--muted); }

@media (max-width: 640px) {
    .topbar { height: auto; padding: 10px 14px; flex-wrap: wrap; }
    .wrap { margin-top: 18px; }
}