:root {
    --paper: #F7F8FA;
    --ink: #0B0D12;
    --brand: #1E40AF;
    --brand-light: #3B82F6;
    --accent: #10B981;
    --gray: #6B7280;
    --gray-light: #9CA3AF;
    --border: rgba(0,0,0,0.08);
    --danger: #DC2626;
    --danger-bg: #FEF2F2;
    --success: #166534;
    --success-bg: #F0FDF4;
    --warning: #92400E;
    --warning-bg: #FFFBEB;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--paper);
    color: var(--ink);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--brand);
    text-decoration: none;
}

a:hover { text-decoration: underline; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.navbar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 50;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
}

.navbar-nav {
    display: flex;
    gap: 20px;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar-nav a {
    color: var(--gray);
    font-size: 14px;
    font-weight: 500;
}

.navbar-nav a:hover {
    color: var(--ink);
    text-decoration: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s;
    text-decoration: none;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--brand);
    color: #fff;
}

.btn-primary:hover { background: #1e3a8a; text-decoration: none; }

.btn-secondary {
    background: #E5E7EB;
    color: var(--ink);
}

.btn-secondary:hover { background: #D1D5DB; text-decoration: none; }

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #FECACA;
}

.btn-danger:hover { background: #FECACA; text-decoration: none; }

.btn-sm { padding: 5px 10px; font-size: 13px; }

.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--brand-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

input::placeholder { color: var(--gray-light); }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #FECACA;
}

.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid #BBF7D0;
}

.alert-warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid #FDE68A;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

table th,
table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

table th {
    font-weight: 600;
    color: var(--gray);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

table tr:last-child td { border-bottom: none; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-danger { background: #FEE2E2; color: #991B1B; }
.badge-info { background: #DBEAFE; color: #1E40AF; }

.text-muted { color: var(--gray); }
.text-small { font-size: 13px; }
.text-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }

.page-header {
    margin: 32px 0 24px;
}

.page-header h1 {
    margin: 0 0 6px;
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.015em;
}

.page-header p {
    margin: 0;
    color: var(--gray);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .navbar-nav { gap: 12px; }
}

.copy-box {
    display: flex;
    gap: 8px;
    align-items: center;
}

.copy-box input {
    flex: 1;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 13px;
}

.model-card {
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.model-card:hover { border-color: var(--brand-light); }

.model-card.active {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.08);
}

.model-card h3 {
    margin: 0 0 6px;
    font-size: 16px;
}

.model-card p {
    margin: 0;
    color: var(--gray);
    font-size: 13px;
}

.tabs {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    text-decoration: none;
}

.tab:hover { color: var(--ink); text-decoration: none; }

.tab.active {
    color: var(--brand);
    border-bottom-color: var(--brand);
}