:root,
[data-theme="dark"] {
    --bg: #0d1117;
    --bg-elevated: #151b23;
    --bg-card: #1a2129;
    --border: #2a323c;
    --text: #e6edf3;
    --text-muted: #9aa7b4;
    --brand: #4f8cff;
    --brand-hover: #6ea0ff;
    --accent: #22c58b;
    --danger: #f0605a;
    --warning: #e8b94b;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    --radius: 14px;
}

[data-theme="light"] {
    --bg: #f6f8fa;
    --bg-elevated: #ffffff;
    --bg-card: #ffffff;
    --border: #dfe4ea;
    --text: #1c2733;
    --text-muted: #5c6b7a;
    --brand: #2f6fed;
    --brand-hover: #1e57cf;
    --accent: #189b6b;
    --danger: #d8433d;
    --warning: #b8860b;
    --shadow: 0 4px 16px rgba(20, 30, 45, 0.08);
    --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* -------------------- Navbar -------------------- */
.navbar {
    position: sticky; top: 0; z-index: 40;
    background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.navbar-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; max-width: 1180px; margin: 0 auto; }
.navbar-brand { font-weight: 700; font-size: 1.15rem; color: var(--text); display: flex; align-items: center; gap: 8px; }
.navbar-links { display: flex; gap: 22px; align-items: center; }
.navbar-links a { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; }
.navbar-links a:hover, .navbar-links a.active { color: var(--text); }
.navbar-actions { display: flex; gap: 10px; align-items: center; }
.nav-toggle { display: none; }

.theme-toggle {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 999px;
    width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--text);
}

/* -------------------- Buttons -------------------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: 0.92rem;
    border: 1px solid transparent; cursor: pointer; transition: transform .05s ease, opacity .15s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); color: #fff; }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 0.82rem; border-radius: 8px; }
.btn-block { width: 100%; }

/* -------------------- Hero -------------------- */
.hero { padding: 72px 0 56px; text-align: center; }
.hero h1 { font-size: 2.6rem; margin: 0 0 14px; letter-spacing: -0.02em; }
.hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 640px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* -------------------- Cards / grids -------------------- */
.section { padding: 40px 0; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }
.section-header h2 { font-size: 1.4rem; margin: 0; }

.grid { display: grid; gap: 18px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    box-shadow: var(--shadow); padding: 20px;
}

.provider-card { display: flex; flex-direction: column; gap: 12px; transition: border-color .15s ease; }
.provider-card:hover { border-color: var(--brand); }
.provider-logo {
    width: 56px; height: 56px; border-radius: 12px; background: var(--bg-elevated);
    display: flex; align-items: center; justify-content: center; font-weight: 700; overflow: hidden;
    border: 1px solid var(--border); font-size: 0.9rem;
}
.provider-logo img { width: 100%; height: 100%; object-fit: contain; }
.provider-card h3 { margin: 0; font-size: 1.05rem; }
.badge {
    display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px;
    background: var(--bg-elevated); border: 1px solid var(--border); font-size: 0.75rem; color: var(--text-muted);
    font-weight: 600;
}
.badge-brand { background: color-mix(in srgb, var(--brand) 15%, transparent); color: var(--brand); border-color: transparent; }
.badge-accent { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); border-color: transparent; }
.badge-warning { background: color-mix(in srgb, var(--warning) 18%, transparent); color: var(--warning); border-color: transparent; }

/* -------------------- Plan cards -------------------- */
.plan-card { display: flex; flex-direction: column; gap: 10px; }
.plan-price { font-size: 1.9rem; font-weight: 800; }
.plan-price span { font-size: 0.95rem; font-weight: 500; color: var(--text-muted); }
.keypoint-list { list-style: none; margin: 8px 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.keypoint-list li { display: flex; align-items: flex-start; gap: 8px; font-size: 0.88rem; color: var(--text-muted); }
.keypoint-list li i { color: var(--accent); margin-top: 2px; }

/* -------------------- Calculator -------------------- */
.calc-layout { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 28px; align-items: start; }
.calc-form .field { margin-bottom: 16px; }
.calc-form label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 6px; }
.calc-form select, .calc-form input[type="number"], .calc-form input[type="text"], .calc-form textarea {
    width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
    background: var(--bg-elevated); color: var(--text); font-size: 0.95rem;
}
.addon-option { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; }
.addon-option label { display: flex; align-items: center; gap: 10px; font-weight: 500; font-size: 0.9rem; margin: 0; }

.calc-summary { position: sticky; top: 90px; }
.calc-total { text-align: center; padding: 18px 0; }
.calc-total .amount { font-size: 2.4rem; font-weight: 800; color: var(--brand); }
.calc-total .label { color: var(--text-muted); font-size: 0.88rem; text-transform: uppercase; letter-spacing: .04em; }
.calc-breakdown { list-style: none; margin: 14px 0 0; padding: 0; border-top: 1px solid var(--border); padding-top: 14px; }
.calc-breakdown li { display: flex; justify-content: space-between; padding: 5px 0; font-size: 0.9rem; }
.calc-breakdown li.negative { color: var(--accent); }
.calc-breakdown .total-row { border-top: 1px solid var(--border); margin-top: 8px; padding-top: 10px; font-weight: 700; }
.disclaimer { font-size: 0.78rem; color: var(--text-muted); margin-top: 14px; }

/* -------------------- Comparison table -------------------- */
.compare-table-wrap { overflow-x: auto; }
table.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
table.compare-table th, table.compare-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.9rem; }
table.compare-table th { color: var(--text-muted); font-weight: 600; white-space: nowrap; }
table.compare-table td.feature-label { color: var(--text-muted); font-weight: 600; white-space: nowrap; }

.compare-cards { display: none; }

/* -------------------- Experience / rating -------------------- */
.stars { color: var(--warning); letter-spacing: 2px; }
.experience-card blockquote { margin: 10px 0 0; color: var(--text-muted); font-style: normal; line-height: 1.5; }
.experience-meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }

/* -------------------- Forms (admin) -------------------- */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 0.85rem; margin-bottom: 6px; }
.form-group .hint { font-size: 0.76rem; color: var(--text-muted); margin-top: 4px; }
input, select, textarea {
    font-family: inherit;
}
.form-check { display: flex; align-items: center; gap: 8px; }
.form-check label { font-weight: 500; margin: 0; }

.repeatable-row { display: grid; grid-template-columns: 1fr 1fr 140px 40px; gap: 10px; margin-bottom: 8px; align-items: center; }

/* -------------------- Admin shell -------------------- */
.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar {
    width: 240px; flex-shrink: 0; background: var(--bg-elevated); border-right: 1px solid var(--border);
    padding: 20px 14px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.admin-sidebar .brand { font-weight: 700; padding: 6px 10px 18px; }
.admin-nav { display: flex; flex-direction: column; gap: 2px; }
.admin-nav a {
    padding: 9px 12px; border-radius: 8px; color: var(--text-muted); font-size: 0.9rem; font-weight: 500;
}
.admin-nav a:hover, .admin-nav a.active { background: var(--bg-card); color: var(--text); }
.admin-nav .group-label { font-size: 0.72rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: .05em; margin: 14px 10px 4px; }
.admin-main { flex: 1; padding: 28px 32px; max-width: 1100px; }
.admin-topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }

.stat-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 28px; }
.stat-card .num { font-size: 1.9rem; font-weight: 800; }
.stat-card .label { color: var(--text-muted); font-size: 0.85rem; }

table.admin-table { width: 100%; border-collapse: collapse; }
table.admin-table th, table.admin-table td { padding: 11px 12px; border-bottom: 1px solid var(--border); font-size: 0.88rem; text-align: left; }
table.admin-table th { color: var(--text-muted); font-weight: 600; }
.table-actions { display: flex; gap: 8px; }

.empty-state { text-align: center; padding: 50px 20px; color: var(--text-muted); }

.toast-stack { position: fixed; top: 16px; right: 16px; z-index: 100; display: flex; flex-direction: column; gap: 10px; }
.toast { padding: 12px 16px; border-radius: 10px; box-shadow: var(--shadow); font-size: 0.9rem; font-weight: 500; color: #fff; }
.toast.success { background: var(--accent); }
.toast.error { background: var(--danger); }

/* -------------------- Footer -------------------- */
footer.site-footer { border-top: 1px solid var(--border); padding: 28px 0; margin-top: 50px; color: var(--text-muted); font-size: 0.85rem; text-align: center; }

/* -------------------- Error pages -------------------- */
.error-page { text-align: center; padding: 100px 20px; }
.error-page .code { font-size: 5rem; font-weight: 800; color: var(--brand); }

/* -------------------- Responsive -------------------- */
@media (max-width: 900px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .calc-layout { grid-template-columns: 1fr; }
    .calc-summary { position: static; }
    .form-grid { grid-template-columns: 1fr; }
    .admin-sidebar { display: none; }
    .admin-main { padding: 20px; max-width: 100%; }
    .stat-cards { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .navbar-links { display: none; }
    .hero h1 { font-size: 2rem; }
    table.compare-table { display: none; }
    .compare-cards { display: flex; flex-direction: column; gap: 16px; }
    .repeatable-row { grid-template-columns: 1fr; }
}