:root {
    --bg-base: #0a0b0f;
    --bg-surface: #12141a;
    --bg-elevated: #1a1d26;
    --bg-hover: #22262f;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);
    --text-primary: #f0f2f5;
    --text-secondary: #8b929e;
    --text-muted: #5c6370;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.12);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --warning: #f59e0b;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --font: 'DM Sans', system-ui, sans-serif;
    --mono: 'JetBrains Mono', monospace;
    --sidebar-width: 260px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
    font-family: var(--font);
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(99, 102, 241, 0.08), transparent);
    pointer-events: none;
    z-index: 0;
}

/* Layout */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    padding: 1.5rem 1rem;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    margin-bottom: 2rem;
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border-radius: var(--radius-sm);
    display: grid;
    place-items: center;
    color: white;
}

.brand-icon svg { width: 20px; height: 20px; }

.sidebar-nav {
    list-style: none;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all 0.15s ease;
}

.sidebar-nav a svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-nav a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    background: var(--accent-glow);
    color: var(--accent-hover);
}

.sidebar-footer {
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.user-badge {
    font-size: 0.8125rem;
    color: var(--text-muted);
    padding: 0 0.75rem;
}

main.with-sidebar {
    margin-left: var(--sidebar-width);
    padding: 2rem 2.5rem;
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

main.standalone {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* Typography */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.375rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Cards */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.card + .card { margin-top: 1.5rem; }

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.card-header h2 {
    font-size: 1rem;
    font-weight: 600;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    transition: border-color 0.15s;
}

.stat-card:hover { border-color: var(--border-strong); }

.stat-card .label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1;
}

.stat-card .value.accent { color: var(--accent-hover); }
.stat-card .value.success { color: var(--success); }

/* Forms */
.form-group { margin-bottom: 1.25rem; }

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group small {
    display: block;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9375rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea { resize: vertical; min-height: 80px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.form-row .form-group {
    margin-bottom: 0;
}

@media (max-width: 640px) {
    .form-row { grid-template-columns: 1fr; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.15s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover { background: rgba(239, 68, 68, 0.2); }

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }

.btn-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Tables */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th {
    text-align: left;
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255, 255, 255, 0.02); }

td strong { color: var(--text-primary); font-weight: 600; }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-muted { background: var(--bg-elevated); color: var(--text-muted); }

/* Alerts */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
    border: 1px solid;
}

.alert-success { background: var(--success-bg); border-color: rgba(34, 197, 94, 0.2); color: var(--success); }
.alert-error { background: var(--danger-bg); border-color: rgba(239, 68, 68, 0.2); color: var(--danger); }
.alert-info { background: var(--accent-glow); border-color: rgba(99, 102, 241, 0.2); color: var(--accent-hover); }

/* Login */
.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 4px);
    padding: 2.5rem;
    box-shadow: var(--shadow);
}

.login-card .brand-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.25rem;
}

.login-card h1 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
    letter-spacing: -0.03em;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 2rem;
}

/* QR Modal */
.qr-display {
    text-align: center;
    padding: 1.5rem;
}

.qr-display img {
    border-radius: var(--radius-sm);
    background: white;
    padding: 0.75rem;
    margin-bottom: 1rem;
}

.qr-display .secret-key {
    font-family: var(--mono);
    font-size: 0.875rem;
    background: var(--bg-elevated);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    word-break: break-all;
    margin: 1rem 0;
    color: var(--accent-hover);
}

.qr-display .live-code {
    font-family: var(--mono);
    font-size: 2.5rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--text-primary);
    margin: 1rem 0 0.5rem;
}

.qr-display .timer-bar {
    height: 3px;
    background: var(--bg-elevated);
    border-radius: 999px;
    overflow: hidden;
    margin-top: 0.75rem;
}

.qr-display .timer-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 999px;
    transition: width 1s linear;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: grid;
    place-items: center;
    z-index: 1000;
    padding: 1rem;
    animation: fadeIn 0.15s ease;
}

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: slideUp 0.2s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: 1.0625rem; font-weight: 600; }

.modal-body { padding: 1.5rem; }

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    padding: 0.25rem;
}

.modal-close:hover { color: var(--text-primary); }

/* Code blocks */
pre, code {
    font-family: var(--mono);
    font-size: 0.8125rem;
}

pre {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    overflow-x: auto;
    line-height: 1.7;
    color: var(--text-secondary);
}

code {
    background: var(--bg-elevated);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    color: var(--accent-hover);
}

pre code { background: none; padding: 0; color: inherit; }

/* Docs */
.docs-section { margin-bottom: 2.5rem; }
.docs-section h3 { font-size: 1.125rem; margin-bottom: 0.75rem; }
.docs-section p { color: var(--text-secondary); margin-bottom: 1rem; font-size: 0.9375rem; }

.method-badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: 0.5rem;
}

.method-post { background: rgba(34, 197, 94, 0.15); color: var(--success); }

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.4;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    main.with-sidebar { margin-left: 0; padding: 1.5rem; }
}