:root {
  --ink: #45413f;
  --ink-soft: #6f6966;
  --paper: #fffef9;
  --surface: #ffffff;
  --line: #dedbd3;
  --yellow: #fff47d;
  --yellow-soft: #fffbe1;
  --leaf: #cadb45;
  --leaf-soft: #f2f7c8;
  --coral: #e585b5;
  --pink: #e585b5;
  --radius-lg: 28px;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --jp: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
}

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

button:focus-visible, input:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 3px solid rgba(229, 133, 181, .34);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 50;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 10px;
  color: white;
  background: var(--ink);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 82px;
  padding: 12px max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(222, 219, 211, .8);
  background: rgba(255, 254, 249, .92);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}
.brand-mark { width: 48px; height: 48px; object-fit: contain; }
.brand strong { display: block; font-size: 1.08rem; letter-spacing: -.02em; }
.brand small { display: block; margin-top: -2px; color: var(--ink-soft); font-size: .75rem; }

.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border: 0;
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  font-size: .88rem;
  font-weight: 650;
  transition: .18s ease;
}
.nav-item:hover { color: var(--ink); background: var(--yellow-soft); }
.nav-item.is-active { color: var(--ink); background: var(--yellow); }
.nav-item > span:first-child { font-family: var(--jp); font-size: .82rem; }
.nav-count { display: grid; min-width: 20px; height: 20px; place-items: center; border-radius: 99px; color: white; background: var(--coral); font-size: .66rem; }

.streak-pill {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  font-size: .78rem;
}
.streak-pill > span { color: var(--coral); }

.main-content { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.topbar {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
}

.eyebrow {
  display: block;
  margin: 0;
  color: var(--coral);
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .13em;
  line-height: 1.4;
  text-transform: uppercase;
}
.welcome { margin: 4px 0 0; font-family: var(--jp); font-weight: 650; }
.welcome span { margin-left: 6px; color: var(--ink-soft); font-family: var(--sans); font-size: .8rem; font-weight: 500; }

.reading-toggle {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 11px 7px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  cursor: pointer;
}
.reading-toggle > span:first-child { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 50%; background: var(--leaf); font-family: var(--jp); font-weight: 750; }
.reading-toggle small, .reading-toggle strong { display: block; text-align: left; line-height: 1.15; }
.reading-toggle small { color: var(--ink-soft); font-size: .62rem; text-transform: uppercase; }
.reading-toggle strong { margin-top: 2px; font-size: .76rem; }

.view { padding: 36px 0 58px; animation: appear .28s ease both; }
.view[hidden] { display: none; }
@keyframes appear { from { opacity: 0; transform: translateY(4px); } }

.study-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  align-items: center;
  gap: clamp(34px, 7vw, 96px);
}

.page-heading h1, .section-heading h1 {
  max-width: 760px;
  margin: 10px 0 0;
  font-size: clamp(2.7rem, 6vw, 5.3rem);
  font-weight: 800;
  letter-spacing: -.065em;
  line-height: .94;
}
.page-heading h1 em, .section-heading h1 em { color: var(--coral); font-style: normal; font-weight: 800; }
.page-heading.compact h1 { max-width: 620px; }
.intro-copy { max-width: 510px; margin: 22px 0 0; color: var(--ink-soft); font-size: 1.05rem; }

.guide-card {
  position: relative;
  display: grid;
  min-height: 330px;
  place-items: center;
  overflow: hidden;
  border-radius: 34px;
  border: 1px solid var(--line);
  background: white;
}
.guide-card img { width: min(90%, 330px); height: auto; }

.sentence-form {
  margin-top: 38px;
  padding: 14px;
  border: 2px solid var(--ink);
  border-radius: 22px;
  background: white;
}
.sentence-form > label { display: block; padding: 4px 10px 2px; color: var(--ink-soft); font-size: .7rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.input-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: stretch; }
.input-row textarea {
  width: 100%;
  min-height: 74px;
  resize: vertical;
  padding: 12px 10px;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font-family: var(--jp);
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
  line-height: 1.45;
}

.primary-button, .secondary-button {
  border: 0;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 800;
  transition: transform .18s ease, background .18s ease;
}
.primary-button { min-width: 176px; padding: 14px 20px; color: white; background: var(--coral); }
.primary-button:hover { background: var(--ink); transform: translateY(-1px); }
.primary-button span, .secondary-button span { margin-left: 10px; }

.sample-row { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; padding: 8px 7px 1px; }
.sample-row > span { margin-right: 3px; color: var(--ink-soft); font-size: .7rem; font-weight: 750; text-transform: uppercase; }
.sample-row button { padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--paper); font-family: var(--jp); font-size: .75rem; cursor: pointer; }
.sample-row button:hover { border-color: var(--ink); background: var(--yellow-soft); }

.analysis-card { margin-top: 22px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background: white; }
.analysis-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 28px; padding: 32px 34px 28px; }
.analysis-header h2 { margin: 7px 0 2px; font-family: var(--jp); font-size: clamp(1.6rem, 3.5vw, 2.35rem); font-weight: 700; letter-spacing: -.02em; }
.translation { margin: 3px 0 0; color: var(--ink-soft); font-size: 1.04rem; }
.save-button { flex: 0 0 auto; padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; background: white; cursor: pointer; font-size: .78rem; font-weight: 750; }
.save-button:hover, .save-button[aria-pressed="true"] { border-color: var(--pink); background: #fff0f6; }

.literal-line { display: grid; grid-template-columns: 80px 1fr; gap: 14px; padding: 16px 34px; border-block: 1px solid var(--line); background: var(--yellow-soft); }
.literal-line span { color: var(--coral); font-size: .7rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.literal-line p { margin: 0; color: var(--ink-soft); font-size: .92rem; }

.breakdown-heading { display: flex; align-items: end; justify-content: space-between; padding: 28px 34px 16px; }
.breakdown-heading h3 { margin: 3px 0 0; font-size: 1.15rem; }
.word-count { color: var(--ink-soft); font-size: .76rem; }
.token-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; padding: 0 34px 34px; }
.token {
  position: relative;
  min-height: 132px;
  padding: 25px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
  text-align: left;
  cursor: pointer;
  transition: .18s ease;
}
.token:hover, .token.is-active { border-color: var(--ink); background: var(--yellow); transform: translateY(-2px); }
.token-num { position: absolute; top: 9px; right: 11px; color: #aaa39f; font-size: .66rem; }
.token ruby { display: block; font-family: var(--jp); font-size: 1.22rem; font-weight: 700; }
.token rt { color: var(--coral); font-size: .53em; font-weight: 600; }
.token-meaning { display: block; margin-top: 13px; color: var(--ink-soft); font-size: .76rem; }

.word-detail {
  display: grid;
  grid-template-columns: 52px minmax(170px, .7fr) 1.5fr;
  align-items: center;
  gap: 26px;
  margin-top: 12px;
  padding: 25px 32px;
  border-radius: 20px;
  background: var(--leaf-soft);
}
.detail-index { color: #8c982d; font-size: 1.8rem; font-weight: 800; }
.detail-word { padding-right: 24px; border-right: 1px solid rgba(69,65,63,.2); }
.detail-word ruby { display: block; font-family: var(--jp); font-size: 1.55rem; font-weight: 750; }
.detail-word rt { color: var(--coral); font-size: .5em; }
.detail-word > span { color: var(--ink-soft); font-size: .75rem; }
.detail-meaning h3 { margin: 4px 0 2px; font-size: 1.18rem; }
.detail-meaning p { max-width: 620px; margin: 2px 0 0; color: var(--ink-soft); font-size: .87rem; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; }
.search-field { display: flex; width: min(350px, 100%); align-items: center; gap: 8px; padding: 11px 14px; border: 1px solid var(--line); border-radius: 999px; background: white; }
.search-field span { color: var(--coral); font-size: 1.2rem; }
.search-field input { width: 100%; border: 0; outline: 0; background: transparent; }
.library-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin-top: 36px; }
.phrase-card { display: flex; min-height: 186px; flex-direction: column; padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: white; transition: .18s ease; }
.phrase-card:nth-child(4n + 1) { border-top: 5px solid var(--yellow); }
.phrase-card:nth-child(4n + 2) { border-top: 5px solid var(--leaf); }
.phrase-card:nth-child(4n + 3) { border-top: 5px solid var(--coral); }
.phrase-card:nth-child(4n + 4) { border-top: 5px solid var(--pink); }
.phrase-card:hover { transform: translateY(-2px); border-color: var(--ink); }
.phrase-card h2 { margin: 9px 0 5px; font-family: var(--jp); font-size: 1.12rem; line-height: 1.5; }
.phrase-card > p { margin: 0; color: var(--ink-soft); }
.phrase-card footer { display: flex; min-height: 0; justify-content: space-between; margin-top: auto; padding: 22px 0 0; border: 0; }
.phrase-card footer span { color: var(--ink-soft); font-size: .72rem; }
.phrase-card button { border: 0; color: var(--coral); background: transparent; font-size: .76rem; font-weight: 800; cursor: pointer; }
.empty-state { padding: 60px 0; color: var(--ink-soft); text-align: center; }

.practice-layout { display: grid; grid-template-columns: 1.5fr .7fr; gap: 14px; margin-top: 38px; }
.flashcard { position: relative; display: flex; min-height: 400px; flex-direction: column; justify-content: center; padding: clamp(28px, 6vw, 62px); overflow: hidden; border: 2px solid var(--ink); border-radius: var(--radius-lg); background: var(--yellow); }
.flashcard::after { content: "あ"; position: absolute; right: -20px; bottom: -85px; color: rgba(69,65,63,.07); font-family: var(--jp); font-size: 17rem; font-weight: 900; line-height: 1; }
.card-number { position: absolute; top: 23px; right: 27px; color: var(--ink-soft); font-weight: 700; }
.flashcard-label { margin: 0 0 14px; color: var(--coral); font-size: .72rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.flashcard h2 { z-index: 1; margin: 0; font-family: var(--jp); font-size: clamp(1.8rem, 4vw, 3rem); }
.answer { z-index: 1; margin-top: 28px; padding-top: 21px; border-top: 1px solid rgba(69,65,63,.24); }
.answer p { margin: 5px 0 0; font-size: 1.3rem; font-weight: 650; }
.reveal-button { z-index: 1; align-self: flex-start; margin-top: 30px; }
.practice-controls { display: flex; flex-direction: column; justify-content: end; padding: 26px; border-radius: var(--radius-lg); background: var(--leaf-soft); }
.practice-controls p { color: var(--ink-soft); font-size: 1.03rem; }
.secondary-button { margin-top: 16px; padding: 13px 16px; border: 1px solid var(--ink); background: white; }
.secondary-button:hover { color: white; background: var(--ink); }

.main-content > footer { display: flex; align-items: center; gap: 12px; padding: 24px 0 38px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .75rem; }
.main-content > footer img { width: 36px; height: 36px; object-fit: contain; }
.main-content > footer p:last-child { margin-left: auto; font-family: var(--jp); }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 30; transform: translateY(18px); padding: 12px 16px; border-radius: 12px; color: white; background: var(--ink); opacity: 0; pointer-events: none; transition: .2s ease; }
.toast.is-visible { transform: translateY(0); opacity: 1; }
.readings-hidden rt, .readings-hidden .detail-word > span { visibility: hidden; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; padding-inline: 20px; }
  .nav-list { grid-column: 1 / -1; justify-content: center; order: 3; width: 100%; padding-top: 8px; border-top: 1px solid var(--line); }
  .main-content { width: min(100% - 36px, 760px); }
  .study-intro { grid-template-columns: 1fr; }
  .guide-card { min-height: 280px; }
  .guide-card img { width: min(70%, 300px); }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .library-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-header { min-height: 72px; }
  .brand small, .streak-pill { display: none; }
  .brand-mark { width: 42px; height: 42px; }
  .nav-list { justify-content: space-between; }
  .nav-item { padding-inline: 10px; font-size: .78rem; }
  .nav-item > span:first-child, .nav-count { display: none; }
  .topbar { min-height: 70px; }
  .welcome span, .reading-toggle small { display: none; }
  .view { padding-top: 22px; }
  .page-heading h1, .section-heading h1 { font-size: 3rem; }
  .guide-card { min-height: 255px; }
  .sentence-form { margin-top: 28px; }
  .input-row { grid-template-columns: 1fr; }
  .input-row textarea { min-height: 92px; }
  .primary-button { min-height: 50px; }
  .analysis-header { align-items: stretch; flex-direction: column; padding: 26px 22px 22px; }
  .save-button { align-self: flex-start; }
  .literal-line { grid-template-columns: 1fr; padding: 16px 22px; }
  .breakdown-heading { padding: 24px 22px 15px; }
  .token-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 0 22px 26px; }
  .word-detail { grid-template-columns: 44px 1fr; gap: 12px; padding: 21px; }
  .detail-word { padding-right: 0; border-right: 0; }
  .detail-meaning { grid-column: 1 / -1; }
  .practice-layout { grid-template-columns: 1fr; }
  .main-content > footer p:last-child { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}