/* =========================================================
   Company of One — FastBilly brand system
   Magenta #FF6BD8 · Teal #4FD1C5 · Warm dark #211E24
   Primary text #FBF3FA · Body text #E0D6DE
   ========================================================= */

:root {
  --brand-magenta: #FF6BD8;
  --brand-teal: #4FD1C5;

  /* Dark (default) */
  --bg: #211E24;
  --bg-elev: #2A2630;
  --bg-elev-2: #332E3B;
  --text: #FBF3FA;
  --text-body: #E0D6DE;
  --text-muted: #9E96A5;
  --line: rgba(251, 243, 250, 0.10);
  --line-strong: rgba(251, 243, 250, 0.18);
  --card: rgba(255, 255, 255, 0.03);
  --card-hover: rgba(255, 255, 255, 0.055);

  --accent: var(--brand-magenta);
  --accent-2: var(--brand-teal);

  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Instrument Serif", "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --wrap: 1120px;
}

html[data-theme="light"] {
  --bg: #FBF3FA;
  --bg-elev: #FFFFFF;
  --bg-elev-2: #F3EAF1;
  --text: #211E24;
  --text-body: #3A3440;
  --text-muted: #6E6577;
  --line: rgba(33, 30, 36, 0.10);
  --line-strong: rgba(33, 30, 36, 0.18);
  --card: rgba(33, 30, 36, 0.025);
  --card-hover: rgba(33, 30, 36, 0.05);
  --shadow: 0 10px 30px rgba(33, 30, 36, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle top-of-page radial glow for depth */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 70vh;
  background:
    radial-gradient(60% 60% at 30% 20%, rgba(255, 107, 216, 0.10), transparent 60%),
    radial-gradient(50% 50% at 80% 10%, rgba(79, 209, 197, 0.08), transparent 65%);
  pointer-events: none;
  z-index: 0;
  filter: blur(0.5px);
}

html[data-theme="light"] body::before {
  background:
    radial-gradient(60% 60% at 30% 20%, rgba(255, 107, 216, 0.14), transparent 60%),
    radial-gradient(50% 50% at 80% 10%, rgba(79, 209, 197, 0.10), transparent 65%);
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #211E24; padding: 8px 12px;
  font-weight: 600;
}
.skip-link:focus { left: 12px; top: 12px; z-index: 100; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 62px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 600; letter-spacing: -0.01em;
  font-size: 16.5px;
}
.brand:hover { color: var(--text); }
.brand-mark {
  width: 28px; height: 22px;
  color: var(--brand-magenta);
  display: block;
}
.brand-mark.sm { width: 22px; height: 18px; }
.header-right {
  display: inline-flex; align-items: center; gap: 18px;
}
.nav-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}
.theme-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--text-body);
  padding: 6px 12px;
  border-radius: 999px;
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}
.theme-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--brand-teal);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--brand-teal) 30%, transparent);
}
html[data-theme="light"] .theme-dot { background: var(--brand-magenta); box-shadow: 0 0 0 2px color-mix(in oklab, var(--brand-magenta) 30%, transparent); }

@media (max-width: 640px) {
  .nav-tagline { display: none; }
}

/* ============ Hero ============ */
.hero {
  padding: 84px 0 56px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--brand-teal);
  margin-bottom: 20px;
}
.hero-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.03;
  letter-spacing: -0.015em;
  color: var(--text);
  margin: 0 0 22px;
  max-width: 18ch;
}
.hero-title .accent {
  font-style: italic;
  color: var(--brand-magenta);
  display: inline;
}
.hero-sub {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.55;
  color: var(--text-body);
  max-width: 62ch;
  margin: 0 0 34px;
}
.hero-cta {
  display: flex; gap: 12px; flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 20px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 140ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
}
.btn-primary {
  background: var(--brand-magenta);
  color: #211E24;
}
.btn-primary:hover {
  background: var(--brand-teal);
  color: #211E24;
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  border-color: var(--brand-teal);
  color: var(--brand-teal);
}
.btn-lg { padding: 14px 26px; font-size: 15.5px; }

/* ============ Tab bar ============ */
.tabbar {
  position: sticky;
  top: 62px;
  z-index: 30;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.tabbar-inner {
  display: flex; gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 8px 24px;
}
.tabbar-inner::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font: inherit; font-size: 13.5px; font-weight: 500;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}
.tab:hover { color: var(--text); }
.tab.is-active {
  color: var(--text);
  background: color-mix(in oklab, var(--brand-magenta) 14%, transparent);
  border-color: color-mix(in oklab, var(--brand-magenta) 40%, transparent);
}

/* ============ Panels ============ */
.panel {
  display: none;
  padding: 68px 0 96px;
  animation: fadeIn 260ms ease both;
}
.panel.is-active { display: block; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.panel h2 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--text);
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 22ch;
}
.panel .lede {
  font-size: clamp(16.5px, 1.3vw, 18.5px);
  color: var(--text-body);
  max-width: 70ch;
  margin: 0 0 40px;
}
.foot-note {
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 14px;
  max-width: 68ch;
}

/* ============ Stack list ============ */
.stack-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 4px;
}
.stack-list li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.stack-list li:last-child { border-bottom: 1px solid var(--line); }
.stack-num {
  font-family: var(--font-mono);
  color: var(--brand-teal);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding-top: 4px;
}
.stack-list h3 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.stack-list p {
  margin: 0;
  color: var(--text-body);
  max-width: 62ch;
}

/* ============ Cards grid ============ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
@media (max-width: 780px) {
  .grid-2 { grid-template-columns: 1fr; }
}
.card, .example-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.card:hover, .example-card:hover {
  background: var(--card-hover);
  border-color: var(--line-strong);
}
.card-eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--brand-teal);
  margin-bottom: 10px;
}
.card h3, .example-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.005em;
}
.card p, .example-card p {
  margin: 0 0 8px;
  color: var(--text-body);
}
.example-card strong { color: var(--text); font-weight: 600; }

/* ============ Chip grid (connectors) ============ */
.chip-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
}
.chip-grid li {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  background: var(--card);
  display: flex; flex-direction: column; gap: 3px;
  transition: border-color 160ms ease, background 160ms ease;
}
.chip-grid li:hover {
  border-color: color-mix(in oklab, var(--brand-magenta) 50%, transparent);
  background: var(--card-hover);
}
.chip-name {
  color: var(--text); font-weight: 600; font-size: 15px;
  letter-spacing: -0.005em;
}
.chip-sub {
  color: var(--text-muted); font-size: 13px;
}

/* ============ Tables ============ */
.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  background: var(--card);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
thead th {
  text-align: left;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.14em;
  padding: 14px 18px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
  text-transform: uppercase;
}
tbody td, tbody th {
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  color: var(--text-body);
  vertical-align: top;
}
tbody tr:first-child td, tbody tr:first-child th { border-top: none; }
tbody th[scope="row"] {
  color: var(--text);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
  width: 160px;
}
.num { text-align: right; font-variant-numeric: tabular-nums; }
tfoot td {
  padding: 14px 18px;
  border-top: 1px solid var(--line-strong);
  color: var(--text);
  font-weight: 600;
  background: var(--bg-elev);
}
.total { color: var(--brand-magenta); }

.vs-table thead th:nth-child(2) { color: var(--text-muted); }
.vs-table thead th:nth-child(3) { color: var(--brand-magenta); }

/* ============ Steps ============ */
.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 4px;
}
.steps > li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.steps > li:last-child { border-bottom: 1px solid var(--line); }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 50%;
  background: color-mix(in oklab, var(--brand-magenta) 18%, transparent);
  color: var(--brand-magenta);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
}
.steps h3 { margin: 6px 0 6px; color: var(--text); font-size: 18px; font-weight: 600; }
.steps p { margin: 0; color: var(--text-body); max-width: 66ch; }

/* ============ Contact ============ */
.contact-wrap {
  max-width: 720px;
}

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 30px;
  color: var(--text-muted);
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px;
}
.footer-brand {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text);
  font-size: 14px;
}
.footer-brand .brand-mark { color: var(--brand-magenta); }
.footer-meta {
  display: inline-flex; gap: 14px;
  font-size: 13px;
}

/* ============ Small screens ============ */
@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .panel { padding: 44px 0 72px; }
  .stack-list li, .steps > li { grid-template-columns: 56px 1fr; gap: 12px; }
  .stack-num { padding-top: 6px; }
  tbody th[scope="row"] { width: 130px; }
}