/* ------------------------------------------------------------------ */
/* Rian landing — paper-and-ink editorial. Tokens mirror               */
/* app/src/theme/theme.ts (light palette). If they disagree, app wins. */
/* ------------------------------------------------------------------ */

:root {
  --paper: #FBF7EF;
  --ink: #2B2A26;
  --ink-soft: #6B675E;
  --accent: #1F8A4C;
  --accent-pressed: #186E3C;
  --accent-soft: #D7EBDD;
  --saved-bg: #FBE6BE;
  --saved-ink: #7A5B12;
  --sheet: #FFFDF9;
  --border: #E7E0D2;
  --danger: #B3261E;

  --serif: 'Noto Serif', Georgia, 'Times New Roman', serif;
  --serif-km: 'Noto Serif Khmer', 'Noto Serif', serif;

  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-soft: 0 2px 8px rgba(43, 42, 38, 0.05);
  --shadow-card: 0 6px 18px rgba(43, 42, 38, 0.07);

  --measure: 68rem;

  /* z-scale: content 0 · header 20 · grain 30 · skip-link 40 */
  --z-header: 20;
  --z-grain: 30;
  --z-skip: 40;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:lang(km) {
  font-family: var(--serif-km);
  line-height: 1.8; /* Khmer stacked signs clip below ~1.7 */
}

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

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

::selection { background: var(--accent-soft); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 24px;
}

section { padding-block: 92px 104px; }
@media (max-width: 720px) { section { padding-block: 60px 72px; } }

/* Paper grain — breaks digital flatness without leaving the palette. */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: var(--z-skip);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; text-decoration: none; }

/* --------------------------------- type -------------------------- */

h1, h2, h3 { font-weight: 700; letter-spacing: -0.02em; text-wrap: balance; }
p { text-wrap: pretty; }

h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.25rem);
  line-height: 1.2;
  max-width: 26ch;
}

h3 { font-size: 1.2rem; line-height: 1.35; }

.kicker {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.lede {
  font-size: 1.1875rem;
  color: var(--ink-soft);
  max-width: 54ch;
  margin-top: 18px;
}

.muted { color: var(--ink-soft); }

/* --------------------------------- header ------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(251, 247, 239, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.wordmark {
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.wordmark:hover { text-decoration: none; }
.wordmark .km {
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-weight: 400;
  margin-left: 6px;
}

.site-nav { display: flex; gap: 26px; align-items: center; }
.site-nav .nav-link {
  color: var(--ink-soft);
  font-size: 0.95rem;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}
.site-nav .nav-link:hover { color: var(--ink); text-decoration: none; }
.site-nav .nav-link.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}
@media (max-width: 720px) { .site-nav .nav-link { display: none; } }

/* --------------------------------- buttons ----------------------- */

.btn {
  display: inline-block;
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  padding: 15px 28px;
  transition: background-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(31, 138, 76, 0.28);
}
.btn-primary:hover { background: var(--accent-pressed); text-decoration: none; color: #fff; }

.btn-small { padding: 10px 18px; font-size: 0.9rem; }

/* --------------------------------- hero -------------------------- */

.hero { padding-block: 88px 104px; overflow: hidden; }

.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 48px; }
}

.hero-note {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.waitlist {
  margin-top: 30px;
  display: flex;
  gap: 10px;
  max-width: 30rem;
}
@media (max-width: 520px) { .waitlist { flex-direction: column; } }

.waitlist input[type='email'] {
  flex: 1;
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--sheet);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.waitlist input::placeholder { color: var(--ink-soft); }

.waitlist-msg { margin-top: 10px; font-size: 0.9rem; }
.waitlist-msg.ok { color: var(--accent-pressed); }
.waitlist-msg.err { color: var(--danger); }

/* ------------------------------ reader demo ---------------------- */

.demo {
  background: var(--sheet);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px 26px 26px;
  max-width: 26.5rem;
  margin-inline: auto;
  width: 100%;
}

.demo-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 18px;
}

.demo-lang {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.demo-lang label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.demo-lang select {
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 7px 10px;
  max-width: 13rem;
  cursor: pointer;
}

.demo-text { font-size: 1.125rem; line-height: 1.9; }

.tap-word {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1px 3px;
  margin: -1px -1px;
  border-radius: 6px;
  border-bottom: 2px dotted var(--border);
  transition: background-color 140ms ease;
}
.tap-word:hover { background: var(--accent-soft); }
.tap-word[aria-pressed='true'] {
  background: var(--accent-soft);
  border-bottom-color: var(--accent);
}
.tap-word.saved {
  background: var(--saved-bg);
  color: var(--saved-ink);
  border-bottom-color: var(--saved-ink);
}

.demo-sheet {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--paper);
  padding: 18px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 300ms cubic-bezier(0.16, 1, 0.3, 1), transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
  visibility: hidden;
}
.demo-sheet.open { opacity: 1; transform: none; visibility: visible; }

.demo-sheet-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.demo-word { font-weight: 700; font-size: 1.25rem; letter-spacing: -0.01em; }

.pos-chip {
  font-size: 0.7rem;
  text-transform: lowercase;
  letter-spacing: 0.05em;
  background: var(--accent-soft);
  color: var(--accent-pressed);
  border-radius: 999px;
  padding: 3px 10px;
  font-weight: 700;
}

.demo-translation {
  font-family: var(--serif-km);
  font-size: 1.45rem;
  line-height: 1.8;
  margin: 6px 0 8px;
}

.demo-gloss { color: var(--ink-soft); font-size: 0.95rem; }
.demo-example {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--ink-soft);
}

.demo-save {
  margin-top: 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 10px 18px;
  cursor: pointer;
  transition: background-color 160ms ease, transform 160ms ease;
}
.demo-save:active { transform: scale(0.98); }
.demo-save.saved { background: var(--saved-bg); color: var(--saved-ink); }

.demo-hint {
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 12px;
}

/* ------------------------------ problem strip -------------------- */

.problems { border-block: 1px solid var(--border); background: var(--sheet); }

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 8px;
}
@media (max-width: 800px) { .problem-grid { grid-template-columns: 1fr; } }

.problem {
  border-left: 2px solid var(--border);
  padding-left: 20px;
}
.problem h3 { margin-bottom: 8px; }
.problem p { color: var(--ink-soft); font-size: 1rem; }

/* ------------------------------ steps ---------------------------- */

/* Three-step flow — read (paper) → tap (accent) → remember (amber),
   the same color semantics the app uses. */
.flow {
  display: grid;
  grid-template-columns: 1fr 36px 1fr 36px 1fr;
  gap: 10px;
  align-items: stretch;
  margin-top: 48px;
}
@media (max-width: 800px) {
  .flow { grid-template-columns: 1fr; gap: 6px; }
}

.flow-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.flow-read { background: var(--sheet); }
.flow-tap { background: var(--accent-soft); border-color: var(--accent); }
.flow-save { background: var(--saved-bg); border-color: var(--saved-ink); }

.flow-head { display: flex; align-items: baseline; gap: 12px; }

.flow-num {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}
.flow-tap .flow-num { color: var(--accent-pressed); }
.flow-save .flow-num { color: var(--saved-ink); }

.flow-card h3 { font-size: 1.15rem; }
.flow-save h3, .flow-save p { color: var(--saved-ink); }

.flow-card p { color: var(--ink-soft); font-size: 0.95rem; flex: 1; }

.flow-chip {
  align-self: flex-start;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.85rem;
  line-height: 1.7;
  font-variant-numeric: tabular-nums;
}
.flow-tap .flow-chip { background: var(--sheet); border-color: var(--accent); color: var(--accent-pressed); }
.flow-save .flow-chip { background: var(--sheet); border-color: var(--saved-ink); color: var(--saved-ink); }

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
}
.flow-arrow svg { stroke: var(--ink-soft); }
@media (max-width: 800px) {
  .flow-arrow { padding: 2px 0; }
  .flow-arrow svg { transform: rotate(90deg); }
}

.flow-loop {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-top: 26px;
}
.flow-loop span { color: var(--accent); font-weight: 700; margin-right: 6px; }

/* ------------------------------ languages ------------------------ */

.langs { background: var(--sheet); border-block: 1px solid var(--border); }

.lang-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
}

.lang-chip {
  border: 1px solid var(--border);
  background: var(--paper);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.95rem;
  line-height: 1.7;
}
.lang-chip.featured {
  background: var(--accent-soft);
  border-color: var(--accent);
  font-weight: 700;
}

/* ------------------------------ remember ------------------------- */

.remember .wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 900px) { .remember .wrap { grid-template-columns: 1fr; } }

.flashcard {
  background: var(--sheet);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 40px 32px;
  text-align: center;
  max-width: 22rem;
  margin-inline: auto;
  width: 100%;
}
.flashcard .fc-word { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; }
.flashcard .fc-km {
  font-family: var(--serif-km);
  font-size: 1.3rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-top: 8px;
}
.fc-grades {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 28px;
}
.fc-grade {
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  color: var(--ink-soft);
  background: var(--paper);
}
.fc-grade.good { background: var(--accent-soft); color: var(--accent-pressed); border-color: var(--accent); }

.check-list { list-style: none; margin-top: 24px; }
.check-list li {
  padding-left: 30px;
  position: relative;
  margin-bottom: 14px;
  color: var(--ink-soft);
}
.check-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.5em;
  width: 12px;
  height: 7px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

/* ------------------------------ early access --------------------- */

.founder {
  background: var(--sheet);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 44rem;
  margin: 40px auto 0;
}
.founder blockquote { font-size: 1.15rem; line-height: 1.7; }
.founder figcaption { margin-top: 18px; color: var(--ink-soft); font-size: 0.95rem; }

.stats-row {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 44px;
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat .n {
  font-size: 2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stat .l { color: var(--ink-soft); font-size: 0.9rem; }

/* ------------------------------ pricing -------------------------- */

.pricing { background: var(--sheet); border-block: 1px solid var(--border); }

.plan-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 44px;
  max-width: 52rem;
}
@media (max-width: 760px) { .plan-grid { grid-template-columns: 1fr; } }

.plan {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
}
.plan.featured { border-color: var(--accent); box-shadow: var(--shadow-card); }

.plan-badge {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 14px;
}

.plan h3 { font-size: 1.35rem; }
.plan-price { margin: 10px 0 4px; font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; }
.plan-price span { font-size: 1rem; font-weight: 400; color: var(--ink-soft); }
.plan-sub { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 20px; }

.plan .check-list { margin-top: 4px; flex: 1; }
.plan .check-list li { font-size: 0.98rem; margin-bottom: 11px; }

.price-tiles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 22px;
}
@media (max-width: 420px) { .price-tiles { grid-template-columns: 1fr; } }

.price-tile {
  position: relative;
  background: var(--sheet);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.tile-featured {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.tile-badge {
  position: absolute;
  top: -9px;
  right: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 999px;
  padding: 3px 10px;
}

.tile-name {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.tile-featured .tile-name { color: var(--accent-pressed); }

.tile-price {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.tile-per { font-size: 0.8rem; color: var(--ink-soft); }

.plan-note { margin-top: 28px; font-size: 0.85rem; color: var(--ink-soft); max-width: 52rem; }

/* ------------------------------ faq ------------------------------ */

.faq-list { margin-top: 36px; max-width: 46rem; }

.faq-item { border-bottom: 1px solid var(--border); }

.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  text-align: left;
  padding: 22px 4px;
  cursor: pointer;
}

.faq-q .toggle {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  position: relative;
}
.faq-q .toggle::before,
.faq-q .toggle::after {
  content: '';
  position: absolute;
  background: var(--ink-soft);
  border-radius: 1px;
  transition: transform 200ms ease;
}
.faq-q .toggle::before { left: 0; top: 7px; width: 16px; height: 2px; }
.faq-q .toggle::after { left: 7px; top: 0; width: 2px; height: 16px; }
.faq-q[aria-expanded='true'] .toggle::after { transform: scaleY(0); }

.faq-a {
  padding: 0 40px 22px 4px;
  color: var(--ink-soft);
  display: none;
}
.faq-item.open .faq-a { display: block; }

/* ------------------------------ final cta ------------------------ */

.final-cta { text-align: center; }
.final-cta h2 { margin-inline: auto; }
.final-cta .waitlist { margin-inline: auto; justify-content: center; }

/* ------------------------------ footer --------------------------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 40px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.site-footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--ink); }
.site-footer .soon { color: var(--ink-soft); opacity: 0.55; cursor: default; }

/* 404 page */
.notfound {
  min-height: 70dvh;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 8px;
}
.notfound .code {
  font-size: 5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

/* ------------------------------ reveal motion -------------------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1), transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--stagger, 0) * 80ms);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .demo-sheet { transition: none; }
  .btn, .demo-save { transition: none; }
}