/* Kanji Nova home page: the interactive sections. Shared styles are in styles.css. */

:root { --wave: rgba(176, 43, 38, 0.07); --green: #2e7d4f; --shadow: 0 18px 50px rgba(28, 26, 23, 0.14); }
@media (prefers-color-scheme: dark) {
  :root { --wave: rgba(229, 86, 78, 0.08); --green: #5fbf86; --shadow: 0 18px 50px rgba(0, 0, 0, 0.45); }
}

/* The home page is wider than the text pages, for the two-column sections. */
.home .wrap { max-width: 1080px; }
[hidden] { display: none !important; }

.home .top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.home section { scroll-margin-top: 70px; }
.eyebrow { margin: 0 0 6px; color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.home h2 { font-size: clamp(26px, 5vw, 36px); line-height: 1.15; margin: 0 0 12px; }
.section-head { text-align: center; max-width: 36em; margin: 0 auto 28px; }
.section-head .note { margin: 0; }
.ink-accent { color: var(--accent); }

/* Seigaiha waves behind the hero, drawn in CSS. */
.hero-band {
  position: relative; overflow: hidden; padding: 56px 0 90px;
  background:
    radial-gradient(circle at 100% 150%, var(--paper) 24%, var(--wave) 25%, var(--wave) 28%, var(--paper) 29%, var(--paper) 36%, var(--wave) 37%, var(--wave) 40%, transparent 41%) 0 0 / 56px 28px,
    radial-gradient(circle at 0 150%, var(--paper) 24%, var(--wave) 25%, var(--wave) 28%, var(--paper) 29%, var(--paper) 36%, var(--wave) 37%, var(--wave) 40%, transparent 41%) 0 0 / 56px 28px,
    var(--paper);
}
.wave-edge {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 60px; background: var(--paper);
  clip-path: polygon(0 60%, 8% 40%, 18% 55%, 30% 30%, 42% 50%, 55% 28%, 68% 52%, 80% 34%, 92% 50%, 100% 38%, 100% 100%, 0 100%);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
.hero-copy h1 { font-size: clamp(40px, 8vw, 64px); line-height: 1.05; margin: 8px 0 16px; font-family: var(--serif); }
.hero-copy .lede { color: var(--muted); font-size: 18px; max-width: 32em; margin: 0 0 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-actions .badge { margin: 0; }
.stats { display: flex; flex-wrap: wrap; gap: 28px; margin: 32px 0 0; }
.stats div { min-width: 110px; }
.stats dt { font: 700 30px/1 var(--serif); color: var(--ink); font-variant-numeric: tabular-nums; }
.stats dd { margin: 4px 0 0; color: var(--muted); font-size: 14px; }

/* The phone and its widget. */
.phone-stage { position: relative; display: grid; place-items: center; min-height: 520px; }
.phone {
  width: 260px; height: 520px; border-radius: 42px; padding: 12px;
  background: linear-gradient(145deg, #2a2724, #0f0e0d);
  box-shadow: var(--shadow), inset 0 0 0 2px #3a3632;
  rotate: -3deg; animation: float 7s ease-in-out infinite;
}
.phone-screen {
  position: relative; height: 100%; border-radius: 32px; overflow: hidden; padding: 14px 16px;
  background: linear-gradient(rgba(20, 19, 17, 0.25), rgba(20, 19, 17, 0.55)), url('/art/great-wave.jpg') center / cover;
  display: flex; flex-direction: column; gap: 16px;
}
.phone-status { display: flex; justify-content: space-between; color: #fff; font-size: 12px; font-weight: 600; opacity: 0.9; }
.widget {
  all: unset; box-sizing: border-box; cursor: pointer; display: grid; justify-items: center; gap: 2px;
  padding: 12px 10px 14px; border-radius: 22px; background: #fbf9f4; color: #000; border: 1px solid #e4ddcf;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3); transition: transform 0.2s ease;
}
.widget:hover { transform: translateY(-2px); }
.widget:active { transform: scale(0.97); }
.widget:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.widget-head { display: flex; gap: 6px; align-items: center; justify-self: start; }
.widget-seal { background: #b02b26; color: #fff; font: 700 10px/1 var(--sans); padding: 3px 5px; border-radius: 4px; letter-spacing: 0.05em; }
.widget-tag { font: 700 10px/1 var(--sans); color: #4a4440; letter-spacing: 0.1em; }
.widget-kanji { font: 700 86px/1.1 var(--serif); transition: opacity 0.35s, transform 0.35s; }
.widget-reading { font: 14px/1.3 var(--serif); color: #4a4440; transition: opacity 0.35s; }
.widget-meaning { font: 600 15px/1.3 var(--sans); transition: opacity 0.35s; }
.widget.swap .widget-kanji { opacity: 0; transform: translateY(6px); }
.widget.swap .widget-reading, .widget.swap .widget-meaning { opacity: 0; }
.app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; padding: 4px 6px; }
.app-grid i { aspect-ratio: 1; border-radius: 12px; background: rgba(255, 255, 255, 0.28); }
.phone-hint { margin: auto 0 4px; text-align: center; color: #fff; font-size: 12px; opacity: 0.8; }
.float-card {
  position: absolute; background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; padding: 10px 14px;
  font-size: 14px; box-shadow: var(--shadow); color: var(--muted);
}
.float-card b { color: var(--accent); margin-right: 4px; }
.float-a { left: 0; top: 18%; animation: float 6s ease-in-out infinite reverse; }
.float-b { right: 0; bottom: 16%; animation: float 8s ease-in-out infinite; }
@keyframes float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -10px; } }

/* Stroke order. */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; padding-block: 64px; }
.stroke-stage { display: grid; gap: 16px; justify-items: center; }
#stroke-svg {
  width: min(320px, 80vw); aspect-ratio: 1; background: var(--surface);
  border: 1px solid var(--rule); border-radius: 24px; box-shadow: var(--shadow);
}
.stroke-grid line { stroke: var(--rule); stroke-width: 0.6; stroke-dasharray: 2 2; }
#stroke-paths path { fill: none; stroke: var(--ink); stroke-width: 3.6; stroke-linecap: round; stroke-linejoin: round; }
#stroke-paths path.current { stroke: var(--accent); }
.split-copy p { color: var(--muted); }
button.button { border: 0; font: inherit; font-weight: 700; cursor: pointer; }
.button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip {
  font: 600 15px/1 var(--sans); padding: 9px 14px; border-radius: 999px; cursor: pointer;
  background: var(--surface); color: var(--ink); border: 1px solid var(--rule);
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}
.chip:hover { transform: translateY(-1px); border-color: var(--accent); }
.chip[aria-selected='true'] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.chip.jp { font-family: var(--serif); font-size: 18px; }

/* Features: three across when there is room, so six cards make two even rows. */
.home .features { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .home .features { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); } }

/* Feature cards are links to the features page. */
a.feature { display: block; color: inherit; text-decoration: none; }
.see-all { text-align: center; margin-top: 24px; }

/* Features: a lift on hover. */
.feature { transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s; }
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--accent); }

/* Quiz. */
.quiz-band { background: var(--surface); border-block: 1px solid var(--rule); padding: 64px 0; margin-top: 56px; }
.quiz { display: grid; gap: 18px; max-width: 560px; margin: 0 auto; }
.quiz-card {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 22px;
  padding: 24px 20px; text-align: center; box-shadow: var(--shadow);
}
.quiz-score { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.quiz-kanji { font: 700 112px/1.15 var(--serif); margin: 4px 0 0; }
.quiz-kanji.pop { animation: pop 0.35s ease; }
@keyframes pop { from { scale: 0.85; opacity: 0; } to { scale: 1; opacity: 1; } }
.quiz-reading { min-height: 1.6em; color: var(--muted); font-family: var(--serif); margin-bottom: 14px; }
.quiz-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.option {
  font: 600 16px/1.3 var(--sans); padding: 14px 10px; border-radius: 14px; cursor: pointer;
  background: var(--surface); color: var(--ink); border: 1px solid var(--rule);
  transition: transform 0.12s, border-color 0.12s;
}
.option:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-1px); }
.option:disabled { cursor: default; opacity: 0.55; }
.option.right { border-color: var(--green); background: color-mix(in srgb, var(--green) 14%, var(--surface)); opacity: 1; }
.option.wrong { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--surface)); opacity: 1; animation: shake 0.35s; }
@keyframes shake { 25% { translate: -5px 0; } 75% { translate: 5px 0; } }
#quiz-next { margin-top: 16px; }

/* Grammar preview. */
.grammar { display: grid; gap: 18px; max-width: 640px; margin: 0 auto; }
.grammar-card { background: var(--surface); border: 1px solid var(--rule); border-radius: 22px; padding: 24px; box-shadow: var(--shadow); }
.grammar-top { margin-bottom: 8px; }
.level-pill { display: inline-block; background: var(--accent); color: var(--on-accent); font: 700 12px/1 var(--sans); padding: 4px 8px; border-radius: 6px; }
.grammar-pattern { font: 400 40px/1.25 var(--serif); margin: 10px 0 2px; }
.grammar-meaning { color: var(--muted); margin: 0; font-size: 18px; }
.example { background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; padding: 16px; margin: 16px 0 12px; }
.example-ja { display: flex; gap: 10px; align-items: flex-start; justify-content: space-between; font: 24px/1.6 var(--serif); }
.example-ja mark { background: none; color: var(--accent); font-weight: 700; text-decoration: underline; text-underline-offset: 5px; }
.example-romaji { color: var(--muted); margin: 6px 0 0; font-size: 15px; }
.example-en { margin: 4px 0 0; }
.speak {
  flex: none; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--rule);
  background: var(--surface); color: var(--muted); cursor: pointer; display: grid; place-items: center;
}
.speak svg { width: 20px; height: 20px; }
.speak.on { color: var(--accent); border-color: var(--accent); }
.toggles { display: flex; gap: 8px; }
.toggle { font: 600 13px/1 var(--sans); padding: 7px 12px; border-radius: 999px; border: 1px solid var(--rule); background: transparent; color: var(--muted); cursor: pointer; }
.toggle.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.hidden-line { visibility: hidden; }

/* Art gallery: a row that scrolls sideways and snaps. */
.art-band { padding: 72px 0 24px; }
.gallery {
  display: flex; gap: 16px; overflow-x: auto; scroll-snap-type: x mandatory;
  padding: 8px max(20px, calc((100vw - 1080px) / 2)) 20px; scrollbar-width: thin;
}
.gallery:focus-visible { outline: 2px solid var(--accent); }
.gallery figure { flex: none; margin: 0; scroll-snap-align: center; width: min(420px, 78vw); }
.gallery figure.tall { width: min(220px, 50vw); }
.gallery img { display: block; width: 100%; height: 300px; object-fit: cover; border-radius: 14px; box-shadow: var(--shadow); transition: transform 0.4s ease; }
.gallery figure:hover img { transform: scale(1.02); }
.gallery figcaption { color: var(--muted); font-size: 13px; margin-top: 8px; }

.cta { padding-top: 40px; }
.cta-card { text-align: center; background: var(--surface); border: 1px solid var(--rule); border-radius: 24px; padding: 40px 24px; }
.cta-card p { color: var(--muted); max-width: 30em; margin: 0 auto 20px; }
.seal.big { width: 64px; height: 64px; font-size: 38px; border-radius: 12px; margin-bottom: 12px; }

/* Sections fade up as they scroll in - only when the script runs (see app.js). */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.js .reveal.seen { opacity: 1; transform: none; }

@media (max-width: 820px) {
  .hero-grid, .split { grid-template-columns: 1fr; }
  .hero-band { padding-top: 36px; }
  .phone-stage { min-height: 480px; }
  .split { padding-block: 40px; gap: 28px; }
  .split-copy { text-align: center; }
}
@media (max-width: 420px) {
  .float-card { display: none; }
  .quiz-kanji { font-size: 92px; }
  .home nav { gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}