:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --ink: #0a0f1a;
    --muted: #5c6b82;
    --line: #d8e0ec;
    --blue: #1a56db;
    --blue-dark: #0f3a9e;
    --blue-soft: #e8efff;
    --black: #0a0f1a;
    --white: #ffffff;
    --danger: #b42318;
    --success: #067647;
    --radius: 6px;
    --font: 'DM Sans', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', monospace;
}

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

body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.5;
}

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

/* Auth */
.auth-body {
    min-height: 100vh;
    background: linear-gradient(145deg, #0a0f1a 0%, #14213d 45%, #1a56db 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-shell { width: 100%; max-width: 420px; }

.auth-panel {
    background: var(--white);
    border-radius: var(--radius);
    padding: 2.5rem;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.25);
}

.auth-brand h1 {
    margin: 0 0 0.5rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--black);
}

.auth-brand p {
    margin: 0 0 2rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.auth-form label {
    display: block;
    margin-bottom: 1rem;
}

.auth-form label span {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
    color: var(--muted);
}

.auth-form input {
    width: 100%;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    font: inherit;
    background: var(--white);
}

.auth-form input:focus {
    outline: 2px solid var(--blue-soft);
    border-color: var(--blue);
}

/* App shell */
.app-body { min-height: 100vh; }

.topbar {
    background: var(--black);
    color: var(--white);
    border-bottom: 3px solid var(--blue);
}

.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    color: var(--white);
    text-decoration: none;
}

.brand-mark {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.04em;
}

.brand-sub {
    font-size: 0.8rem;
    color: #94a3b8;
}

.topnav {
    display: flex;
    gap: 1.25rem;
    margin-left: auto;
}

.topnav a {
    color: #cbd5e1;
    font-size: 0.9rem;
}

.topnav a:hover { color: var(--white); }

.user-chip {
    text-align: right;
    font-size: 0.85rem;
}

.user-chip small {
    display: block;
    color: #94a3b8;
    text-transform: capitalize;
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
}

/* Components */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 700;
}

.page-header p {
    margin: 0.35rem 0 0;
    color: var(--muted);
}

.panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
}

.panel h2 {
    margin: 0 0 1rem;
    font-size: 1.05rem;
    font-weight: 600;
}

.panel-highlight {
    border-color: var(--blue);
    background: var(--blue-soft);
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.stat-block {
    background: var(--black);
    color: var(--white);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--blue);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: #94a3b8;
    margin-top: 0.35rem;
    display: block;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

.btn-primary {
    background: var(--blue);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--blue-dark);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--ink);
    border-color: var(--line);
}

.btn-secondary:hover {
    background: var(--bg);
}

.btn-ghost {
    background: transparent;
    color: #cbd5e1;
    border-color: #334155;
}

.btn-ghost:hover { background: #1e293b; color: var(--white); }

.btn-block { width: 100%; }
.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.8rem; }

.link-btn {
    background: none;
    border: none;
    color: var(--blue);
    cursor: pointer;
    font: inherit;
    padding: 0;
    text-decoration: underline;
}

.link-btn.danger { color: var(--danger); }

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    text-align: left;
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--line);
}

.data-table th {
    font-weight: 600;
    color: var(--muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.data-table tr:hover td { background: #f8fafc; }

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--blue-soft);
    color: var(--blue-dark);
    text-transform: capitalize;
}

.badge-active { background: #d1fae5; color: var(--success); }
.badge-inactive { background: #fee2e2; color: var(--danger); }

.alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-success { background: #d1fae5; color: var(--success); border: 1px solid #a7f3d0; }
.alert-error { background: #fee2e2; color: var(--danger); border: 1px solid #fecaca; }

.empty-state { color: var(--muted); margin: 0; }

.form-hint {
    font-size: 0.85rem;
    color: var(--muted);
    margin: 0 0 1rem;
}

.grid-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    align-items: end;
}

.grid-form.narrow { max-width: 480px; }

.grid-form label span {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
    color: var(--muted);
}

.grid-form input,
.grid-form select,
.grid-form textarea,
.inline-form input[type="text"],
.inline-form input[type="file"],
.inline-form select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    font: inherit;
}

.inline-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.import-panel .inline-form input[type="text"] { min-width: 200px; }

.credential-display {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1.5rem;
    margin: 0;
}

.credential-display dt { font-weight: 600; }
.credential-display code {
    font-family: var(--mono);
    background: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
}

.info-list {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 0.75rem;
    margin: 0;
}

.info-list dt { font-weight: 600; color: var(--muted); }

.mono {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--muted);
}

.error-page {
    text-align: center;
    padding: 4rem 2rem;
}

.error-page h1 {
    font-size: 4rem;
    margin: 0;
    color: var(--black);
}

.readonly-tag {
    font-size: 0.75rem;
    color: var(--muted);
    border: 1px solid var(--line);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
}

@media (max-width: 768px) {
    .topbar-inner { flex-wrap: wrap; }
    .topnav { margin-left: 0; width: 100%; }
    .page-header { flex-direction: column; }
    .actions { flex-direction: column; align-items: flex-start; }
}