/* Landing page (pages/landing.js, ui/landing-demo.js). */

.landing { display: flex; flex-direction: column; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 7vw, 96px) clamp(56px, 8vw, 112px);
  background:
    radial-gradient(55% 60% at 82% 38%, color-mix(in srgb, var(--brand) 10%, transparent), transparent 70%),
    radial-gradient(40% 45% at 8% 35%, color-mix(in srgb, var(--hira) 7%, transparent), transparent 70%);
}
.hero-kana-bg { mask-image: linear-gradient(to bottom, #000 60%, transparent); -webkit-mask-image: linear-gradient(to bottom, #000 60%, transparent); }
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}
.hero-copy { display: flex; flex-direction: column; align-items: flex-start; gap: var(--s-5); }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 14px 5px 6px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--surface-1);
  box-shadow: var(--shadow-1);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 550;
  animation: hk-rise-in var(--dur-4) var(--ease-out) both;
}
.hero-eyebrow-jp {
  white-space: nowrap;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--brand-soft);
  color: var(--brand-text);
  font-family: var(--font-jp);
  font-size: 12px;
  font-weight: 600;
}
.hero-title {
  font-size: clamp(40px, 4.6vw + 12px, 68px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.02;
  animation: hk-rise-in var(--dur-4) var(--ease-out) 60ms both;
}
.hero-title-accent {
  display: inline-block;
  background: linear-gradient(100deg, var(--hira) 0%, var(--brand) 55%, var(--brand-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-bottom: .06em;
}
.hero-lead {
  max-width: 540px;
  color: var(--text-secondary);
  font-size: clamp(16px, .4vw + 14px, 18px);
  line-height: 1.6;
  animation: hk-rise-in var(--dur-4) var(--ease-out) 120ms both;
}
.landing-ctas { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.landing-ctas-hero { margin-top: var(--s-2); animation: hk-rise-in var(--dur-4) var(--ease-out) 180ms both; }
.hero-stats {
  display: flex;
  gap: var(--s-7);
  margin-top: var(--s-3);
  padding-top: var(--s-5);
  border-top: 1px solid var(--border);
  animation: hk-fade-in var(--dur-4) ease 300ms both;
}
.hero-stats dt { color: var(--text-muted); font-size: 12.5px; font-weight: 550; }
.hero-stats dd { margin: 2px 0 0; }
.hero-stat-value { font-size: 20px; font-weight: 750; letter-spacing: -0.02em; color: var(--text-primary); }

/* ---------- Demo card ---------- */
.hero-demo { display: flex; justify-content: center; animation: hk-rise-in 700ms var(--ease-out) 150ms both; }
.demo { position: relative; width: min(100%, 440px); }
.demo-paper {
  position: absolute;
  inset: 0;
  border-radius: var(--r-xl);
  background: var(--surface-1);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-1);
}
.demo-paper-1 { transform: rotate(3.2deg) translate(10px, 8px); opacity: .85; }
.demo-paper-2 { transform: rotate(-2.6deg) translate(-12px, 14px); opacity: .6; }
.demo-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  padding: var(--s-6) var(--s-6) var(--s-5);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  background: var(--surface-1);
  box-shadow: var(--shadow-3);
}
.demo-top { display: flex; align-items: center; gap: var(--s-3); }
.demo-dots { display: inline-flex; gap: 5px; }
.demo-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--surface-3); border: 1px solid var(--border); }
.demo-dots i:nth-child(1) { background: var(--hira); border-color: transparent; }
.demo-dots i:nth-child(2) { background: var(--kata); border-color: transparent; }
.demo-counter { font-size: 12.5px; font-weight: 600; color: var(--text-muted); }
.demo-progress { flex: 1; }
.demo-label { margin-top: var(--s-3); color: var(--text-muted); font-size: 13px; font-weight: 600; letter-spacing: .02em; }
.demo-romaji {
  display: flex;
  min-height: 52px;
  font-size: 40px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--text-primary);
}
.demo-romaji span { opacity: 0; transform: translateY(10px); }
.demo-romaji.is-in span {
  animation: hk-rise-in var(--dur-3) var(--ease-out) both;
  animation-delay: calc(var(--i) * 55ms);
}
.demo-input {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  min-height: 78px;
  padding: 10px 14px 10px 20px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-lg);
  background: var(--surface-2);
  transition: border-color var(--dur-2) ease, box-shadow var(--dur-3) ease, background-color var(--dur-3) ease;
}
.demo-card.is-typing .demo-input { border-color: var(--brand); box-shadow: var(--ring); background: var(--surface-1); }
.demo-card.is-correct .demo-input {
  border-color: var(--success);
  background: var(--success-soft);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--success) 16%, transparent), 0 8px 28px -8px color-mix(in srgb, var(--success) 45%, transparent);
}
.demo-input-text { display: flex; align-items: center; min-width: 0; }
.demo-kana { font-size: 42px; line-height: 1.1; letter-spacing: .01em; color: var(--text-primary); }
.demo-card.is-correct .demo-kana { color: var(--success-text); }
.demo-placeholder { color: var(--text-muted); font-size: 16px; }
.demo-caret {
  width: 2px;
  height: 38px;
  margin-left: 3px;
  border-radius: 2px;
  background: var(--brand);
  opacity: 0;
}
.demo-card.is-typing .demo-caret { opacity: 1; animation: hk-caret 1s steps(1) infinite; }
@keyframes hk-caret { 50% { opacity: 0; } }
.demo-check { flex: none; opacity: 0; transform: scale(.6); transition: opacity var(--dur-2) ease, transform var(--dur-3) var(--ease-spring); }
.demo-check-circle { stroke: var(--success); stroke-width: 3; stroke-dasharray: 145; stroke-dashoffset: 145; }
.demo-check-path { stroke: var(--success); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 36; stroke-dashoffset: 36; }
.demo-card.is-checked .demo-check { opacity: 1; transform: none; }
.demo-card.is-checked .demo-check-circle { transition: stroke-dashoffset 420ms var(--ease-out); stroke-dashoffset: 0; }
.demo-card.is-checked .demo-check-path { transition: stroke-dashoffset 320ms var(--ease-out) 300ms; stroke-dashoffset: 0; }
.demo-feedback { position: relative; display: flex; align-items: center; justify-content: space-between; min-height: 24px; }
.demo-praise {
  color: var(--success-text);
  font-family: var(--font-jp);
  font-size: 15px;
  font-weight: 700;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur-2) ease, transform var(--dur-3) var(--ease-spring);
}
.demo-points {
  color: var(--success-text);
  font-size: 15px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  opacity: 0;
}
.demo-card.is-checked .demo-praise { opacity: 1; transform: none; transition-delay: 250ms; }
.demo-card.is-checked .demo-points { animation: hk-float-up 1.1s var(--ease-out) 200ms both; }
@keyframes hk-float-up {
  0% { opacity: 0; transform: translateY(10px) scale(.8); }
  25% { opacity: 1; transform: translateY(0) scale(1.08); }
  70% { opacity: 1; transform: translateY(-6px) scale(1); }
  100% { opacity: 0; transform: translateY(-18px); }
}
.demo-meaning {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  min-height: 92px;
  padding: var(--s-4);
  border-radius: var(--r-md);
  background: var(--surface-2);
  border: 1px dashed var(--border-strong);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-3) ease, transform var(--dur-4) var(--ease-out);
}
.demo-card.is-checked .demo-meaning { opacity: 1; transform: none; transition-delay: 520ms; }
.demo-meaning-head { display: flex; align-items: baseline; gap: var(--s-3); flex-wrap: wrap; }
.demo-kanji { font-size: 24px; font-weight: 600; color: var(--text-primary); }
.demo-gloss { font-size: 16px; font-weight: 600; color: var(--text-primary); }
.demo-meaning-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.demo-card.is-exit .demo-romaji, .demo-card.is-exit .demo-input-text, .demo-card.is-exit .demo-meaning,
.demo-card.is-exit .demo-praise, .demo-card.is-exit .demo-check {
  opacity: 0;
  transition: opacity 300ms ease;
  transition-delay: 0s;
}

/* ---------- Sections ---------- */
.landing-section { padding-block: clamp(56px, 7vw, 96px); }
.landing-section + .landing-section { padding-top: 0; }
.section-head { display: flex; flex-direction: column; gap: var(--s-2); max-width: 620px; margin-bottom: var(--s-8); }
.section-head h2 { font-size: clamp(26px, 1.6vw + 18px, 36px); letter-spacing: -0.03em; }
.section-lead { color: var(--text-secondary); font-size: 16px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
.feature-card {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-6);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface-1);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) ease, border-color var(--dur-2) ease;
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: var(--border-strong); }
.feature-card h3 { display: flex; align-items: center; gap: var(--s-2); margin-top: var(--s-3); font-size: 16.5px; }
.feature-badge {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 7px;
  border-radius: var(--r-pill);
  background: var(--brand-soft);
  color: var(--brand-text);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.feature-card p { color: var(--text-secondary); font-size: 14.5px; line-height: 1.6; }
.feature-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--brand-soft);
  color: var(--brand-text);
}
.feature-card:nth-child(3n+2) .feature-icon { background: var(--hira-soft); color: var(--hira-text); }
.feature-card:nth-child(3n) .feature-icon { background: var(--kata-soft); color: var(--kata-text); }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); counter-reset: step; }
.step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-6);
  border-radius: var(--r-lg);
  background: var(--surface-2);
  border: 1px solid var(--border);
  overflow: hidden;
}
.step-kana {
  position: absolute;
  right: 10px;
  top: -14px;
  font-size: 120px;
  line-height: 1;
  color: var(--text-primary);
  opacity: .06;
  pointer-events: none;
}
.step-num { color: var(--brand-text); font-size: 12.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.step h3 { font-size: 17px; }
.step p { color: var(--text-secondary); font-size: 14.5px; }

.cta-band {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
  flex-wrap: wrap;
  padding: clamp(28px, 4vw, 48px);
  border-radius: var(--r-xl);
  background:
    radial-gradient(80% 140% at 100% 0%, color-mix(in srgb, var(--brand) 18%, transparent), transparent 60%),
    var(--surface-1);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2);
}
.cta-band-copy h2 { font-size: clamp(24px, 1.4vw + 16px, 32px); letter-spacing: -0.03em; }
.cta-band-copy p { margin-top: 6px; color: var(--text-secondary); }

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-demo { justify-content: flex-start; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .hero-stats { gap: var(--s-5); }
  .hero-demo { justify-content: center; padding-inline: 6px; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .landing-ctas .btn { flex: 1 1 auto; }
  .landing-ctas-hero .btn-primary { flex-basis: 100%; }
  .demo-card { padding: var(--s-5) var(--s-4) var(--s-4); }
  .demo-romaji { font-size: 32px; min-height: 44px; }
  .demo-kana { font-size: 34px; }
  .demo-input { min-height: 66px; }
}