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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  transition: background-color var(--calm-transition), color var(--calm-transition);
}

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

:root {
  --grey-950: #0a0a0a;
  --grey-900: #141414;
  --grey-800: #292929;
  --grey-500: #6a6a6a;
  --grey-100: #ececec;
  --grey-50: #f4f4f4;

  --sage: #7e9384;
  --slate: #7b8794;
  --plum: #8c7089;
  --alert: #a35c66;

  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Helvetica Neue", Inter, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-serif: ui-serif, Georgia, "Iowan Old Style", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Mono", Menlo, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: clamp(1.0625rem, 0.98rem + 0.4vw, 1.1875rem);
  --text-xl: clamp(1.375rem, 1.2rem + 0.85vw, 1.75rem);
  --text-2xl: clamp(1.875rem, 1.5rem + 1.8vw, 2.75rem);
  --text-3xl: clamp(2.5rem, 1.7rem + 3.6vw, 4.5rem);

  --eyebrow-size: 0.6875rem;
  --eyebrow-tracking: 0.24em;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: clamp(4.5rem, 3rem + 7vw, 9rem);

  --radius-sm: 3px;
  --radius: 6px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --radius-panel: 28px;

  --measure: 34rem;
  --page-max: 68rem;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --calm-transition: 2400ms cubic-bezier(0.4, 0, 0.2, 1);
  --ui-transition: 220ms var(--ease);

  color-scheme: dark;
}

:root,
[data-theme="dark"] {
  --bg: #0d0d0d;
  --surface: #161616;
  --surface-raised: #1d1d1d;
  --line: #292929;
  --line-strong: #3a3a3a;
  --ink: #ececec;
  --ink-muted: #8c8c8c;
  --ink-faint: #616161;
  --timer-ink: var(--ink);
  --accent: #88a5a7;
  --accent-strong: #88a5a7;
  --accent-ink: #0c1414;
  --focus: #88a5a7;
  --panel: #ececec;
  --panel-ink: #141414;
  --panel-muted: #5e5e5e;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #e8e8e8;
  --surface: #f4f4f4;
  --surface-raised: #ffffff;
  --line: #d2d2d2;
  --line-strong: #b6b6b6;
  --ink: #191919;
  --ink-muted: #5e5e5e;
  --ink-faint: #8c8c8c;
  --timer-ink: var(--ink);
  --accent: #557375;
  --accent-strong: #435a5c;
  --accent-ink: #ffffff;
  --focus: #435a5c;
  --panel: #191919;
  --panel-ink: #ececec;
  --panel-muted: #8c8c8c;
  color-scheme: light;
}

h1, h2, h3, h4 {
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }

p { text-wrap: pretty; }

a {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.25em;
  transition: text-decoration-color var(--ui-transition);
}

a:hover { text-decoration-color: currentColor; }

.tagline {
  font-family: var(--font-serif);
  font-style: italic;
  letter-spacing: 0.01em;
  color: var(--ink-muted);
}

.eyebrow {
  font-size: var(--eyebrow-size);
  letter-spacing: var(--eyebrow-tracking);
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

.lede {
  font-size: var(--text-lg);
  color: var(--ink-muted);
  max-width: var(--measure);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: 0.34em;
  margin-inline-end: -0.34em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
}

.brand--full,
.brand--compact,
.brand--mark { --lock: 1.25rem; }

.brand-mark {
  flex: none;
  width: calc(var(--lock) * 2.15);
  height: calc(var(--lock) * 2.15);
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: calc(var(--lock) * 0.3);
  text-align: left;
}

.brand--full { gap: calc(var(--lock) * 0.58); }

.brand--full .wordmark,
.brand--compact .wordmark { font-size: var(--lock); }

.brand-desc {
  font-family: var(--font-display);
  font-size: calc(var(--lock) * 0.42);
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
  line-height: 1;
  white-space: nowrap;
}

.brand--compact .brand-desc { display: none; }
.brand--compact { gap: calc(var(--lock) * 0.44); }
.brand--compact .brand-mark {
  width: calc(var(--lock) * 1.5);
  height: calc(var(--lock) * 1.5);
}

.brand--mark .brand-text { display: none; }

.btn {
  --btn-bg: transparent;
  --btn-ink: var(--ink);
  --btn-line: var(--line-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7em 1.4em;
  min-height: 44px;
  border: 1px solid var(--btn-line);
  border-radius: var(--radius-pill);
  background: var(--btn-bg);
  color: var(--btn-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--ui-transition), border-color var(--ui-transition),
              color var(--ui-transition), opacity var(--ui-transition);
}

.btn:hover:not(:disabled) { border-color: var(--ink-muted); }

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn--primary {
  --btn-bg: var(--accent);
  --btn-ink: var(--accent-ink);
  --btn-line: var(--accent);
  font-weight: 500;
}

.btn--primary:hover:not(:disabled) { filter: brightness(1.08); border-color: var(--accent); }

.btn--quiet {
  --btn-line: transparent;
  --btn-ink: var(--ink-muted);
  padding-inline: 0.8em;
}

.btn--quiet:hover:not(:disabled) { --btn-ink: var(--ink); --btn-line: var(--line); }

.btn--danger { --btn-ink: var(--alert); --btn-line: color-mix(in srgb, var(--alert) 40%, transparent); }
.btn--danger:hover:not(:disabled) { --btn-line: var(--alert); }

.btn--block { width: 100%; }

.btn--lg { padding: 0.95em 1.9em; font-size: var(--text-base); }

.btn--bone {
  --btn-bg: var(--panel);
  --btn-ink: var(--panel-ink);
  --btn-line: var(--panel);
  font-weight: 500;
}

.btn--bone:hover:not(:disabled) { filter: brightness(0.94); }

.btn--google {
  --btn-bg: var(--surface-raised);
  --btn-ink: var(--ink);
  --btn-line: var(--line-strong);
  font-weight: 500;
}

.btn--google .google-mark { width: 18px; height: 18px; flex: none; }

.field { display: flex; flex-direction: column; gap: var(--space-2); }

.field > label,
.label {
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.input,
select.input {
  padding: 0.65em 0.85em;
  min-height: 44px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: border-color var(--ui-transition);
}

.input:hover { border-color: var(--line-strong); }

select.input {
  appearance: none;
  padding-right: 2.2em;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
                    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 1.1em) 55%, calc(100% - 0.75em) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

input[type="range"] { accent-color: var(--accent); }

.switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  cursor: pointer;
}

.switch input { position: absolute; opacity: 0; pointer-events: none; }

.switch-track {
  position: relative;
  flex: none;
  width: 44px;
  height: 26px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  transition: background-color var(--ui-transition), border-color var(--ui-transition);
}

.switch-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink-muted);
  transition: transform var(--ui-transition), background-color var(--ui-transition);
}

.switch input:checked + .switch-track { background: var(--accent); border-color: var(--accent); }
.switch input:checked + .switch-track::after { transform: translateX(18px); background: var(--accent-ink); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--focus); outline-offset: 2px; }

.switch-text { display: flex; flex-direction: column; gap: 2px; }
.switch-hint { font-size: var(--text-sm); color: var(--ink-faint); }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) { outline: none; }

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--surface-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transform: translateY(-200%);
  transition: transform var(--ui-transition);
}

.skip-link:focus { transform: translateY(0); }

.page {
  width: min(100% - 2 * var(--space-5), var(--page-max));
  margin-inline: auto;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.rule { border: 0; border-top: 1px solid var(--line); }

.stack { display: flex; flex-direction: column; }
.stack-3 { gap: var(--space-3); }
.stack-4 { gap: var(--space-4); }
.stack-5 { gap: var(--space-5); }
.stack-6 { gap: var(--space-6); }

.row { display: flex; align-items: center; gap: var(--space-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.wrap { flex-wrap: wrap; }

.muted { color: var(--ink-muted); }
.faint { color: var(--ink-faint); }
.center { text-align: center; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

[hidden] { display: none !important; }

.price {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-family: var(--font-display);
}

.price-figure {
  font-size: var(--text-2xl);
  font-weight: 200;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.price-term {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--ink-muted);
}

.notice {
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-left: 2px solid var(--ink-faint);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--surface);
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.notice--error { border-left-color: var(--alert); color: var(--ink); }
.notice--good { border-left-color: var(--sage); }

.connection-banner {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: 60;
  padding: var(--space-3) var(--space-5);
  background: var(--surface-raised);
  border-top: 1px solid var(--line-strong);
  font-size: var(--text-sm);
  color: var(--ink-muted);
  text-align: center;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--line-strong);
  border-top-color: var(--ink-muted);
  border-radius: 50%;
  animation: spin 900ms linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  :root {
    --calm-transition: 1ms linear;
    --ui-transition: 1ms linear;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}