/* Bill Tracker landing — tokens mirror the app's design system
   (Bill-Tracker-Mobile-App/docs/DESIGN_SYSTEM.md). One accent, calm,
   content-first, light + dark from the first commit. */

:root {
  --surface: #f7f7f9;
  --surface-elevated: #ffffff;
  --surface-sunken: #ececf0;
  --text-primary: #1a1c1e;
  --text-secondary: #5c6066;
  --text-disabled: #a3a7ad;
  --accent: #00756a;
  --accent-on-accent: #ffffff;
  --positive: #1e7e34;
  --warning: #9a6a00;
  --danger: #b3261e;
  --outline: #e1e1e6;

  --radius-card: 12px;
  --radius-sheet: 16px;

  --space-xs: 4px;
  --space-s: 8px;
  --space-m: 16px;
  --space-l: 24px;
  --space-xl: 32px;

  --max-width: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #121316;
    --surface-elevated: #1d1f24;
    --surface-sunken: #0b0c0e;
    --text-primary: #f2f3f5;
    --text-secondary: #a8acb3;
    --text-disabled: #62666e;
    --accent: #4dd6c5;
    --accent-on-accent: #00332e;
    --positive: #6fcf8b;
    --warning: #f2c14e;
    --danger: #f2a19b;
    --outline: #33363c;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-l);
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--outline);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-l);
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text-primary);
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-l);
  font-size: 15px;
}
.site-nav a { color: var(--text-secondary); }
.site-nav a:hover { color: var(--text-primary); text-decoration: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-s);
  min-height: 44px;
  padding: 10px 20px;
  border-radius: 999px;
  border: none;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }

.btn-primary,
a.btn-primary {
  background: var(--accent);
  color: var(--accent-on-accent);
}
.btn-primary:hover { filter: brightness(1.08); }

.btn-tonal,
a.btn-tonal {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
}
.btn-tonal:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---------- Hero ---------- */

.hero { padding: 72px 0 56px; }

.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-m);
}

.hero .tagline {
  font-size: 19px;
  color: var(--text-secondary);
  margin: 0 0 var(--space-l);
  max-width: 32em;
}

.hero-badges {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  margin-top: var(--space-l);
  flex-wrap: wrap;
}

.appstore-badge { display: inline-flex; }
.appstore-badge img { height: 48px; display: block; }

.coming-soon {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---------- Waitlist form ---------- */

.waitlist-form {
  display: flex;
  gap: var(--space-s);
  max-width: 440px;
  flex-wrap: wrap;
}

.waitlist-form input[type="email"] {
  flex: 1 1 220px;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--outline);
  background: var(--surface-elevated);
  color: var(--text-primary);
  font-size: 16px;
  font-family: inherit;
}
.waitlist-form input[type="email"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

.form-note {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: var(--space-s);
}

.form-status { font-size: 15px; margin-top: var(--space-s); }
.form-status.ok { color: var(--positive); }
.form-status.err { color: var(--danger); }

/* ---------- Phone mockup ---------- */

.phone {
  width: 300px;
  margin: 0 auto;
  border-radius: 44px;
  border: 1px solid var(--outline);
  background: var(--surface-sunken);
  padding: 12px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.18);
}

.phone-screen {
  border-radius: 34px;
  background: var(--surface);
  padding: 22px 16px 26px;
  overflow: hidden;
}

.phone-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-m);
}

.ring-row {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-card);
  padding: var(--space-m);
  margin-bottom: var(--space-m);
}

.ring {
  --pct: 62;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  flex: none;
  background: conic-gradient(var(--accent) calc(var(--pct) * 1%), var(--surface-sunken) 0);
  display: grid;
  place-items: center;
}
.ring::after {
  content: "62%";
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface-elevated);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
}

.ring-caption .big { font-size: 15px; font-weight: 700; }
.ring-caption .small { font-size: 12px; color: var(--text-secondary); }

.env-card {
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-card);
  padding: 12px var(--space-m);
  margin-bottom: var(--space-s);
}

.env-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}
.env-top .amount { font-variant-numeric: tabular-nums; color: var(--text-secondary); font-weight: 500; }

.env-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-sunken);
  overflow: hidden;
}
.env-bar > i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--positive);
}
.env-bar.warn > i { background: var(--warning); }
.env-bar.over > i { background: var(--danger); }

.env-avatars {
  display: flex;
  margin-top: 8px;
}
.env-avatars span {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-on-accent);
  font-size: 10px;
  font-weight: 700;
  display: grid;
  place-items: center;
  border: 2px solid var(--surface-elevated);
}
.env-avatars span + span { margin-left: -6px; background: var(--warning); }

/* ---------- Sections ---------- */

.section { padding: 64px 0; }
.section.alt { background: var(--surface-sunken); }

.section h2 {
  font-size: clamp(26px, 3.4vw, 36px);
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-s);
}
.section .lead {
  color: var(--text-secondary);
  font-size: 17px;
  max-width: 40em;
  margin: 0 0 var(--space-xl);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-m);
}

.feature {
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-sheet);
  padding: var(--space-l);
}
.section.alt .feature { border-color: transparent; }

.feature .icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-card);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-m);
}
.feature .icon svg { display: block; }

.feature h3 { font-size: 17px; margin: 0 0 6px; }
.feature p { font-size: 15px; color: var(--text-secondary); margin: 0; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-m);
  counter-reset: step;
}

.step {
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-sheet);
  padding: var(--space-l);
  counter-increment: step;
}
.step::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-on-accent);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: var(--space-m);
}
.step h3 { font-size: 17px; margin: 0 0 6px; }
.step p { font-size: 15px; color: var(--text-secondary); margin: 0; }

.cta-box {
  text-align: center;
  padding: 56px var(--space-l);
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-sheet);
}
.cta-box h2 { margin-bottom: var(--space-s); }
.cta-box .lead { margin: 0 auto var(--space-l); }
.cta-box .waitlist-form { margin: 0 auto; justify-content: center; }

/* ---------- Join page ---------- */

.join-main {
  min-height: calc(100vh - 60px - 140px);
  display: grid;
  place-items: center;
  padding: 64px 0;
}

.join-card {
  max-width: 480px;
  margin: 0 var(--space-l);
  background: var(--surface-elevated);
  border: 1px solid var(--outline);
  border-radius: var(--radius-sheet);
  padding: var(--space-xl);
  text-align: center;
}

.join-card .icon-big {
  width: 72px;
  height: 72px;
  border-radius: 22px;
  margin: 0 auto var(--space-l);
  background: var(--accent);
  color: var(--accent-on-accent);
  display: grid;
  place-items: center;
}

.join-card h1 { font-size: 26px; margin: 0 0 var(--space-s); }
.join-card p { color: var(--text-secondary); font-size: 16px; }

.join-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  margin-top: var(--space-l);
}

.join-steps {
  text-align: left;
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--surface-sunken);
  border-radius: var(--radius-card);
  padding: var(--space-m) var(--space-l);
  margin-top: var(--space-l);
}
.join-steps ol { margin: 0; padding-left: 18px; }
.join-steps li + li { margin-top: 4px; }

/* ---------- Legal pages ---------- */

.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px var(--space-l) 80px;
}
.legal h1 { font-size: 32px; letter-spacing: -0.01em; }
.legal h2 { font-size: 20px; margin-top: var(--space-xl); }
.legal p, .legal li { color: var(--text-secondary); font-size: 16px; }
.legal .updated { font-size: 14px; color: var(--text-disabled); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--outline);
  padding: var(--space-xl) 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.site-footer .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-l);
  flex-wrap: wrap;
}
.site-footer nav { display: flex; gap: var(--space-l); margin-left: auto; }
.site-footer a { color: var(--text-secondary); }
.site-footer a:hover { color: var(--text-primary); }

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; gap: var(--space-xl); }
  .phone { width: 280px; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .site-nav .nav-link { display: none; }
}