:root {
    color-scheme: light;
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #111827;
    --pill-on: #e8f5ee;
    --pill-on-text: #117a42;
    --pill-off: #f3f4f6;
    --pill-off-text: #6b7280;
    --sidebar-bg: #16213e;
    --sidebar-text: #ffffff;
    --sidebar-muted: rgba(255,255,255,0.55);
    --sidebar-hover: rgba(255,255,255,0.1);
    --sidebar-active: rgba(255,255,255,0.15);
    --output-bg: #0d1117;
    --output-text: #57f287;
}
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}
.sidebar {
    padding: 28px;
    border-right: none;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    position: sticky;
    top: 0;
    height: 100vh;
    box-sizing: border-box;
}
.sidebar h1, .sidebar h2, .sidebar h3 {
    color: var(--sidebar-text);
}
.sidebar .muted {
    color: var(--sidebar-muted);
}
.sidebar nav { display: grid; gap: 4px; margin-top: 24px; }
.sidebar a, .sidebar a.nav-link {
    color: var(--sidebar-text);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 14px;
    transition: background 0.15s, color 0.15s;
    display: block;
}
.sidebar a:hover, .sidebar a.nav-link:hover {
    background: var(--sidebar-hover);
}
.sidebar a.nav-link.active {
    background: var(--sidebar-active);
    color: var(--sidebar-text);
    font-weight: 600;
}
.content { padding: 28px; display: grid; gap: 20px; align-content: start; }
/* Pages: hidden by default, shown by JS router */
.page { display: grid; gap: 20px; }
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: 0 6px 20px rgba(17, 24, 39, 0.05);
    padding: 24px;
}
.hero { display: flex; align-items: center; justify-content: space-between; }
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 12px; color: var(--muted); margin: 0 0 6px; }
.muted { color: var(--muted); }
.pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.pill.on { background: var(--pill-on); color: var(--pill-on-text); }
.pill.off { background: var(--pill-off); color: var(--pill-off-text); }
/* -- Service rows & toggles ------------------- */
.service-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--line);
    gap: 8px;
}
.service-row:last-child { border-bottom: none; }
.service-name { font-size: 13px; color: var(--text); }
.toggle {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
    flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute;
    cursor: not-allowed;
    inset: 0;
    background: var(--pill-off);
    border-radius: 20px;
    transition: background 0.2s;
}
.toggle-slider::before {
    content: "";
    position: absolute;
    height: 14px;
    width: 14px;
    left: 3px;
    top: 3px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
}
.toggle input:checked + .toggle-slider { background: var(--pill-on); }
.toggle input:checked + .toggle-slider::before { transform: translateX(16px); }
.carrier-groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.carrier-box { border: 1px solid var(--line); border-radius: 16px; padding: 16px; }
.carrier-box ul, .card ul { padding-left: 18px; }
.carrier-box li { display: flex; justify-content: space-between; gap: 12px; margin: 8px 0; }
.carrier-head { display: flex; justify-content: space-between; align-items: center; }
.preview-form label { display: grid; gap: 6px; }
input {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 11px 12px;
    font: inherit;
}
.button {
    appearance: none;
    border: 0;
    background: var(--accent);
    color: white;
    padding: 12px 16px;
    border-radius: 14px;
    font: inherit;
    cursor: pointer;
    margin-top: 12px;
}
.output {
    white-space: pre-wrap;
    background: var(--output-bg);
    color: var(--output-text);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    border-radius: 16px;
    padding: 14px;
    border: none;
    min-height: 140px;
}
.centered {
    max-width: 680px;
    margin: 12vh auto;
}
@media (max-width: 1024px) {
    .shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
    .grid.two, .grid.three, .carrier-groups { grid-template-columns: 1fr; }
    .hero { display: grid; gap: 12px; }
}