/* Smart Payment Gateway — UI */
:root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --surface-2: #f9fafb;
    --border: #e5e7eb;
    --text: #111827;
    --muted: #6b7280;
    --primary: #1683f0;
    --primary-600: #0b6fd6;
    --primary-50: #e3f1ff;
    --success: #059669;
    --success-50: #ecfdf5;
    --warning: #b45309;
    --warning-50: #fffbeb;
    --danger: #dc2626;
    --danger-50: #fef2f2;
    --info: #0369a1;
    --info-50: #f0f9ff;
    --sidebar: #0f172a;
    --sidebar-text: #cbd5e1;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 14px; line-height: 1.5; color: var(--text); background: var(--bg);
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre, .mono { font-family: var(--mono); font-size: 12.5px; }
h1, h2, h3, h4 { margin: 0 0 .5rem; line-height: 1.25; }
h1 { font-size: 22px; } h2 { font-size: 18px; } h3 { font-size: 15px; }
p { margin: 0 0 .75rem; }
hr { border: 0; border-top: 1px solid var(--border); margin: 1rem 0; }

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px; flex-shrink: 0; background: var(--sidebar); color: var(--sidebar-text);
    display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { padding: 18px 20px; font-weight: 700; color: #fff; font-size: 16px; display: flex; gap: 10px; align-items: center; }
.brand .logo { width: 30px; height: 30px; border-radius: 8px; background: var(--primary); display: grid; place-items: center; font-size: 13px; }
.brand small { display: block; font-weight: 500; color: #94a3b8; font-size: 11px; }
.sidebar .brand { flex-direction: column; align-items: flex-start; gap: 8px; }
.brand-logo { display: block; background: #fff; border-radius: 10px; padding: 6px 12px; }
.brand-logo:hover { text-decoration: none; }
.brand-logo img { height: 30px; width: auto; display: block; }
.nav { padding: 8px 10px; flex: 1; }
.nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: #64748b; padding: 14px 10px 6px; }
.nav a {
    display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px;
    color: var(--sidebar-text); font-weight: 500; margin-bottom: 2px;
}
.nav a:hover { background: rgba(255,255,255,.06); text-decoration: none; color: #fff; }
.nav a.active { background: var(--primary); color: #fff; }
.nav .count { margin-left: auto; background: #f59e0b; color: #111; font-size: 11px; padding: 0 7px; border-radius: 99px; font-weight: 700; }
.sidebar-foot { padding: 14px 20px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; }
.sidebar-foot button { background: none; border: 0; color: #fca5a5; padding: 0; cursor: pointer; font: inherit; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
    background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px 28px;
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.topbar .title { font-weight: 600; font-size: 16px; }
.topbar .user { color: var(--muted); font-size: 13px; }
.content { padding: 24px 28px 48px; max-width: 1280px; width: 100%; }
.menu-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; cursor: pointer; }

/* ---------- Components ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 20px; }
.card-header { padding: 14px 18px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.card-header h3 { margin: 0; }
.card-body { padding: 18px; }
.card-body.p0 { padding: 0; }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.span-2 { grid-column: span 2; }

.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.stat .label { color: var(--muted); font-size: 12px; font-weight: 500; }
.stat .value { font-size: 22px; font-weight: 700; margin-top: 4px; letter-spacing: -.01em; }
.stat .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.stat.primary { background: linear-gradient(135deg, #1683f0, #4fb0ff); color: #fff; border: 0; }
.stat.primary .label, .stat.primary .sub { color: rgba(255,255,255,.8); }

.table-wrap { overflow-x: auto; }
table.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: middle; white-space: nowrap; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); background: var(--surface-2); font-weight: 600; }
.table tr:last-child td { border-bottom: 0; }
.table tbody tr:hover { background: #fafafa; }
.table td.wrap { white-space: normal; }
.text-right { text-align: right !important; }
.text-center { text-align: center !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.bold { font-weight: 600; }
.nowrap { white-space: nowrap; }
.empty { padding: 40px; text-align: center; color: var(--muted); }

.badge { display: inline-block; padding: 2px 9px; border-radius: 99px; font-size: 11.5px; font-weight: 600; letter-spacing: .02em; }
.badge-success { background: var(--success-50); color: var(--success); }
.badge-warning { background: var(--warning-50); color: var(--warning); }
.badge-danger { background: var(--danger-50); color: var(--danger); }
.badge-info { background: var(--info-50); color: var(--info); }
.badge-gray { background: #f3f4f6; color: #4b5563; }
.badge-primary { background: var(--primary-50); color: var(--primary); }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 14px; border-radius: 8px;
    border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; font-weight: 600;
    font-size: 13px; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; background: var(--surface-2); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-600); }
.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover { background: #047857; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-link { border: 0; background: none; color: var(--primary); padding: 0; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

.form-row { margin-bottom: 14px; }
label, .label { display: block; font-weight: 600; font-size: 13px; margin-bottom: 5px; }
.input, select.input, textarea.input {
    width: 100%; padding: 8px 11px; border: 1px solid #d1d5db; border-radius: 8px; font: inherit; background: #fff; color: var(--text);
}
.input:focus { outline: 2px solid var(--primary-50); border-color: var(--primary); }
textarea.input { min-height: 80px; resize: vertical; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.error-text { font-size: 12px; color: var(--danger); margin-top: 4px; }
.check { display: inline-flex; align-items: center; gap: 6px; font-weight: 500; }

.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.filters .input { width: auto; min-width: 140px; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; border: 1px solid; }
.alert-success { background: var(--success-50); border-color: #a7f3d0; color: #065f46; }
.alert-danger { background: var(--danger-50); border-color: #fecaca; color: #991b1b; }
.alert-warning { background: var(--warning-50); border-color: #fde68a; color: #92400e; }
.alert-info { background: var(--info-50); border-color: #bae6fd; color: #075985; }
.alert ul { margin: 0; padding-left: 18px; }

dl.kv { display: grid; grid-template-columns: 180px 1fr; gap: 8px 16px; margin: 0; }
dl.kv dt { color: var(--muted); font-size: 13px; }
dl.kv dd { margin: 0; font-weight: 500; word-break: break-all; min-width: 0; }

.secret { display: flex; gap: 8px; align-items: center; }
.secret code { background: var(--surface-2); border: 1px solid var(--border); padding: 7px 10px; border-radius: 8px; flex: 1; overflow-x: auto; white-space: nowrap; }

pre.code { background: #0f172a; color: #e2e8f0; padding: 14px 16px; border-radius: 8px; overflow-x: auto; margin: 0 0 12px; line-height: 1.55; }

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

.chart { display: flex; align-items: flex-end; gap: 10px; height: 160px; padding-top: 10px; }
.chart .bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; height: 100%; justify-content: flex-end; }
.chart .bar { width: 100%; max-width: 46px; background: var(--primary); border-radius: 6px 6px 0 0; min-height: 2px; }
.chart .bar-label { font-size: 11px; color: var(--muted); }
.chart .bar-val { font-size: 11px; font-weight: 600; }

.pagination { display: flex; gap: 4px; padding: 14px 18px; flex-wrap: wrap; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); }
.pagination .pages { display: flex; gap: 4px; flex-wrap: wrap; }
.pagination a, .pagination span.page { padding: 4px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; color: var(--text); }
.pagination span.current { background: var(--primary); border-color: var(--primary); color: #fff; }
.pagination span.disabled { color: #9ca3af; }

details.box { border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin-bottom: 10px; background: var(--surface); }
details.box summary { cursor: pointer; font-weight: 600; }

/* ---------- Guest / Auth ---------- */
.guest { min-height: 100vh; display: grid; place-items: center; padding: 20px; background: radial-gradient(circle at 20% 0%, #c9e4ff, transparent 50%), #f2f8ff; }
.auth-card { width: 100%; max-width: 400px; }

/* ---------- Checkout ---------- */
.checkout { max-width: 440px; margin: 0 auto; padding: 28px 16px; }
.checkout .amount { font-size: 30px; font-weight: 800; letter-spacing: -.02em; }
.qr-box { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: grid; place-items: center; }
.qr-box img { width: 100%; max-width: 280px; height: auto; }
.va-number { font-family: var(--mono); font-size: 24px; font-weight: 700; letter-spacing: .06em; }

/* ---------- Docs ---------- */
.docs { display: grid; grid-template-columns: 230px 1fr; gap: 28px; max-width: 1180px; margin: 0 auto; padding: 28px 20px 60px; }
.docs-nav { position: sticky; top: 20px; align-self: start; font-size: 13px; }
.docs-nav a { display: block; padding: 5px 10px; color: var(--muted); border-radius: 6px; }
.docs-nav a:hover { background: var(--primary-50); color: var(--primary); text-decoration: none; }
.docs-nav .nav-label { color: var(--text); padding-left: 10px; }
.docs section { margin-bottom: 36px; scroll-margin-top: 20px; }
.docs h2 { padding-bottom: 8px; border-bottom: 1px solid var(--border); margin-bottom: 14px; }
.docs h3 { margin-top: 18px; }
.endpoint { display: flex; align-items: center; gap: 10px; background: var(--surface-2); border: 1px solid var(--border); padding: 9px 12px; border-radius: 8px; margin-bottom: 12px; font-family: var(--mono); }
.method { font-weight: 700; font-size: 12px; padding: 2px 8px; border-radius: 5px; color: #fff; }
.method.post { background: #059669; } .method.get { background: #2563eb; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
    .sidebar { position: fixed; left: -260px; z-index: 50; transition: left .2s; }
    .sidebar.open { left: 0; }
    .menu-toggle { display: inline-block; }
    .content { padding: 16px; }
    .topbar { padding: 10px 16px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
    .span-2 { grid-column: auto; }
    dl.kv { grid-template-columns: 1fr; gap: 2px; }
    dl.kv dd { margin-bottom: 8px; }
    .docs { grid-template-columns: minmax(0, 1fr); }
    .docs-nav { position: static; }
}