:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, sans-serif;
  color: #393232;
  background: #f7f4ef;
  --paper: #fdfbf8;
  --ink: #393232;
  --accent: #594750;
  --accent-soft: #efe7e7;
  --line: #e5ddda;
  --muted: #6b605e;
  --serif: "Noto Serif TC", "Songti TC", "Hiragino Mincho ProN", serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
.mast, .study-nav, main, footer { width: min(100% - 32px, 720px); margin-inline: auto; }
.mast, footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.mast { padding-block: 15px 12px; }
.brand { display: flex; align-items: baseline; gap: .65rem; text-decoration: none; color: var(--ink); }
.brand span { font-family: var(--serif); font-weight: 800; letter-spacing: .1em; font-size: 1.65rem; }
.brand small, footer { color: var(--muted); font-size: .8rem; }
.study-nav { display: grid; grid-template-columns: repeat(4, 1fr); gap: 3px; padding: 4px; border: 1px solid var(--line); border-radius: 16px; background: #f0ebe7; margin-bottom: 14px; }
.study-nav button { color: var(--muted); background: transparent; padding-inline: 4px; }
.study-nav button[aria-current] { color: var(--accent); background: var(--paper); box-shadow: 0 1px 3px #59475018; }

.panel { background: var(--paper); border: 1px solid var(--line); border-radius: 22px; padding: clamp(17px, 4.2vw, 30px); margin-bottom: 12px; }
.hero { position: relative; overflow: hidden; isolation: isolate; background: #efe7e5; border-color: #e5d9d7; }
.hero-copy { max-width: 75%; }
.hero-copy p:not(.eyebrow) { color: #67585d; }
.hero-glyph { z-index: -1; position: absolute; inset: auto -8px -34px auto; color: #d5c2c7; font: 400 clamp(7.5rem, 32vw, 15rem)/1 var(--serif); user-select: none; }
.welcome { min-height: 232px; }
.eyebrow { margin: 0 0 .4rem; font-size: .78rem; font-weight: 800; letter-spacing: .14em; color: var(--accent); }
h1, h2, h3 { margin: 0; line-height: 1.28; }
h1 { font: 800 clamp(1.8rem, 6.5vw, 2.85rem)/1.24 var(--serif); }
h2 { font-size: clamp(1.05rem, 4.2vw, 1.28rem); }
h3 { font-size: 1.05rem; }
p { margin: .65rem 0; line-height: 1.65; }
a { color: var(--accent); text-underline-offset: .2em; }
.lead, .note { color: var(--muted); }
.note { font-size: .875rem; }
footer { padding: 12px 0 max(24px, env(safe-area-inset-bottom)); }
footer span:first-child { font-family: var(--serif); font-size: 1.1rem; }

button, input, select { font: inherit; }
button { border: 1px solid transparent; border-radius: 11px; min-height: 44px; background: var(--accent); color: #fff; padding: 9px 14px; font-weight: 700; cursor: pointer; }
button:disabled { opacity: .55; cursor: default; }
.quiet, .choice { background: #f5efed; border-color: var(--line); color: var(--accent); }
.text-button { background: transparent; color: var(--accent); padding-inline: 0; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid #986f80; outline-offset: 3px; }
button:hover:not(:disabled).quiet, button:hover:not(:disabled).choice { background: var(--accent-soft); }
input, select { width: 100%; border: 1px solid #a99c9a; border-radius: 10px; background: #fff; color: var(--ink); min-height: 44px; padding: 9px 11px; font-size: 16px; }
form { display: grid; gap: 12px; margin-top: 15px; }
label { display: grid; gap: 5px; margin-block: 9px; font-weight: 650; }
summary { min-height: 44px; align-content: center; cursor: pointer; font-weight: 700; color: var(--accent); }
.login summary { font-size: 1.03rem; }
.actions, .review-line, .panel-heading { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; }
.panel-heading, .review-line { justify-content: space-between; }
.panel-heading p, .review-line p { margin: 0; color: var(--muted); }
.actions { margin-top: 9px; }
.review-line { margin-top: 8px; }
#kana-count { font-size: .87rem; }
progress { width: 100%; height: 11px; accent-color: var(--accent); margin-top: 9px; }
.legacy, .secondary-practice { border-top: 1px solid var(--line); margin-top: 18px; padding-top: 7px; }
.status { color: var(--accent); font-weight: 650; }
.status:empty { display: none; }

.section-group { border-top: 1px solid var(--line); margin-top: 8px; }
.section-group summary { padding-block: 5px; }
.section-group p { font-size: .875rem; }
.day-list { list-style: none; padding: 0; margin: 0 0 12px; }
.day-list li + li { border-top: 1px solid #eee7e4; }
.day-list button { width: 100%; display: flex; gap: 9px; align-items: center; text-align: left; color: var(--ink); background: transparent; padding-inline: 0; }
.day-list button:hover { color: var(--accent); }
.day-list .lesson-index { color: var(--muted); font-size: .82rem; min-width: 4.6em; }
.day-list .lesson-status { margin-left: auto; color: var(--accent); }

.lesson-heading .eyebrow, #practice .eyebrow, #guide .eyebrow { margin-top: 8px; }
.kana-grid, .compact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(54px, 1fr)); gap: 6px; margin: 10px 0; }
.kana-card { display: grid; align-content: center; justify-items: center; gap: 1px; min-height: 67px; padding: 5px; }
.kana-card span { font: 700 1.48rem/1.2 var(--serif); }
.kana-card small { color: var(--muted); font-weight: 550; }
.hide-romaji small { display: none; }
.inline-check { display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; font-weight: 600; }
.inline-check input { width: 18px; height: 18px; min-height: auto; accent-color: var(--accent); }
.word-panel { margin-block: 18px; }
.word-panel:first-child { margin-top: 0; }
.word-list { display: grid; gap: 7px; }
.word-card { display: grid; grid-template-columns: 1fr auto; align-items: start; gap: 4px 7px; background: #f6f1ee; border: 1px solid var(--line); border-radius: 12px; padding: 6px; }
.word-card .word-audio { text-align: left; min-width: 0; border-color: transparent; }
.word-audio span { display: block; overflow-wrap: anywhere; }
.word-audio .sound-icon { display: inline-block; margin-right: 5px; }
.word-meaning { grid-column: 1 / -1; padding: 0 8px 4px; margin: 0; color: var(--muted); }
#kana-quiz-start, #listen-start { margin-top: 14px; }

.quiz-choices { display: grid; gap: 7px; margin-block: 14px; }
.quiz-choice { text-align: left; overflow-wrap: anywhere; }
.sound-option { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
#quiz-prompt { margin-block: 7px 14px; }
#quiz-next { margin-top: 5px; }
.intro-list { display: grid; grid-template-columns: max-content 1fr; gap: 7px 12px; line-height: 1.5; }
.intro-list dt { font-weight: 700; }
.intro-list dd { margin: 0; }
.segmented { display: flex; gap: 4px; }
.segmented button { background: #f6f1ee; color: var(--accent); padding-inline: 8px; }
.segmented button[aria-pressed="true"] { background: var(--accent); color: white; }
.kana-chart { border-collapse: collapse; width: 100%; table-layout: fixed; }
.kana-chart th { font-size: .82rem; text-align: center; color: var(--muted); }
.kana-chart td { padding: 2px; text-align: center; }
.kana-chart button { padding: 5px 0; min-height: 48px; width: 100%; font-size: 1.08rem; }

.trace { position: relative; max-width: 480px; aspect-ratio: 8 / 5; background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin: 12px 0; background-image: linear-gradient(90deg, transparent 49.8%, #eee6e4 50%, transparent 50.2%), linear-gradient(transparent 49.8%, #eee6e4 50%, transparent 50.2%); }
.trace span, .trace canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.trace span { display: grid; place-items: center; color: #d0c4c6; font: 400 clamp(4rem, 27vw, 8rem)/1 var(--serif); user-select: none; }
.trace .trace-word { font-size: clamp(1.8rem, 11vw, 3.1rem); }
.trace canvas { touch-action: none; }
audio { display: block; width: 100%; margin: 12px 0; }
fieldset { border: 0; padding: 0; margin: 16px 0; }
legend { font-weight: 650; margin-bottom: 8px; }
fieldset button { margin: 4px 6px 4px 0; }
.choices { display: grid; gap: 5px; }
.skills { display: flex; list-style: none; padding: 0; gap: 8px; }
.skills li { flex: 1; text-align: center; background: #f6f1ee; padding: 8px; border-radius: 999px; }
.skills [aria-current] { background: var(--accent); color: white; font-weight: 750; }
.japanese { font: 650 clamp(1.12rem, 4vw, 1.55rem)/1.8 var(--serif); }

@media (min-width: 540px) {
  .hero-glyph { right: 14px; }
  .quiz-choices:not(.sound-choices) { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .word-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}