@layer reset, base, layout, components, responsive;

@layer components {
  .hero-example { padding: 34px; background: var(--soft-green); border: 1px solid #cbd5c4; border-radius: 18px; min-width: 0; }
  .hero-example .hero-english { font-family: var(--serif); font-size: 3rem; margin-top: 16px; line-height: 1.15; }
  .hero-example .hero-romaji { font-size: 1.65rem; color: var(--green); margin-top: 8px; }
  .hero-example > .quiet { margin: 20px 0; font-size: .87rem; }
  .script-preference { display: flex; align-items: flex-start; gap: 9px; margin: 22px 0; color: var(--muted); font-size: .8rem; cursor: pointer; }
  .script-preference input { margin-top: 3px; }
  .script-details, .original-transcript { margin-top: 14px; font-size: .83rem; }
  .script-details summary, .original-transcript summary, .tutor-reference > summary { cursor: pointer; color: var(--green); padding-block: 7px; }
  .script-details .phrase-ja { font-size: 1.15rem; margin: 7px 0 3px; }
  .beginner-phrase .phrase-english { font-size: 1rem; color: var(--ink); font-weight: 600; border: 0; padding: 0; margin: 0; }
  .phrase-romaji { color: var(--green); font-size: 1rem; line-height: 1.7; overflow-wrap: anywhere; }
  .beginner-phrase .phrase-romaji { margin-top: 8px; }
  .phrase-label { font-size: .75rem; font-weight: 400; color: var(--muted); }
  .lesson-steps { display: flex; align-items: center; gap: 12px 18px; flex-wrap: wrap; margin-bottom: 28px; }
  .beginner-start { border: 1px solid #d3dac9; background: var(--soft-green); padding: 16px 20px; border-radius: 8px; margin-bottom: 20px; font-size: .85rem; }
  .lesson-steps .button { font-size: .8rem; padding: 11px 18px; }
  .tutor-plan { background: var(--white); border: 1px solid #d3dac9; border-radius: 8px; padding: 20px 22px 20px 42px; margin: 0 0 22px; font-size: .9rem; }
  .tutor-reference { margin-bottom: 22px; }
  .tutor-reference > summary { font-size: .85rem; font-weight: 600; }
  .tutor-help { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
  .tutor-help .button { min-height: 42px; font-size: .77rem; padding: 9px 13px; background: var(--white); }
  .tutor-next { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; border-top: 1px solid #d3dac9; padding-top: 20px; margin-top: 25px; }
  .transcript-content { min-width: 0; }
  .transcript-content .translation-label { font-size: .68rem; font-weight: 650; letter-spacing: .02em; color: var(--muted); margin: 0 0 4px; }
  .transcript-content .translation-label:not(:first-child) { margin-top: 14px; }
  .transcript-content .small { font-size: .75rem; }
  .review-prompt { font-family: var(--serif); font-size: 2.2rem; margin: 25px 0; }
  .review-answer .phrase-romaji { font-size: 1.5rem; }
  .course-references { margin-top: 30px; border-top: 1px solid var(--line); padding-top: 20px; color: var(--muted); font-size: .83rem; }
  .course-references summary { cursor: pointer; color: var(--ink); padding: 10px 0; }
  .course-references ul { margin-top: 15px; }
  .course-references a { color: var(--green); }
  .course-references li { margin-top: 14px; }
}

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
  button, input, select, textarea { font: inherit; }
  button { cursor: pointer; }
  a { color: inherit; }
  img, svg { display: block; max-width: 100%; }
  [hidden] { display: none !important; }
}

@layer base {
  :root {
    color-scheme: light;
    --paper: #f7f4ec;
    --white: #fffcf6;
    --ink: #252b28;
    --muted: #69716b;
    --red: #b8402c;
    --red-hover: #9b3324;
    --rose: #f2e2d9;
    --line: #deded2;
    --green: #426554;
    --soft-green: #e9eee5;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
    --serif: Georgia, "Times New Roman", "Yu Mincho", "Hiragino Mincho ProN", serif;
  }
  html { scroll-behavior: smooth; scroll-padding-top: 24px; }
  body { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
  ::selection { background: #edcabb; color: var(--ink); }
  :focus-visible { outline: 3px solid var(--green); outline-offset: 4px; }
  button, a, input, select, audio { -webkit-tap-highlight-color: transparent; }
  button:disabled { opacity: .5; cursor: not-allowed; }
  h1, h2, h3, h4 { line-height: 1.2; font-weight: 500; text-wrap: balance; }
  h1 { font-family: var(--serif); font-size: clamp(2.5rem, 5.7vw, 4.6rem); letter-spacing: -.055em; }
  h2 { font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.35rem); letter-spacing: -.035em; }
  h3 { font-size: 1.24rem; letter-spacing: -.025em; }
  h4 { font-size: 1rem; font-weight: 650; }
  p + p { margin-top: .8em; }
  ul, ol { padding-left: 1.2rem; }
  li + li { margin-top: .35rem; }
  input, select { max-width: 100%; color: var(--ink); background: var(--white); border: 1px solid #b9c0b5; border-radius: 8px; padding: .8rem 1rem; }
  input[type="checkbox"], input[type="radio"] { accent-color: var(--red); flex: 0 0 auto; width: 18px; height: 18px; padding: 0; }
  select { cursor: pointer; min-height: 48px; }
  .eyebrow { display: block; color: var(--muted); font-size: .67rem; font-weight: 700; letter-spacing: .16em; line-height: 1.6; }
  .quiet { color: var(--muted); }
  .small { font-size: .8rem; line-height: 1.65; }
  .lead { color: var(--muted); font-size: 1.05rem; line-height: 1.8; max-width: 630px; }
  .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
  .skip-link { position: fixed; top: -100px; left: 1rem; background: var(--ink); color: white; padding: .75rem 1rem; z-index: 100; border-radius: 8px; }
  .skip-link:focus { top: 1rem; }
}

@layer layout {
  .site-header { max-width: 1280px; margin: auto; min-height: 104px; padding: 22px 60px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
  .brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 1.7rem; font-weight: 650; letter-spacing: -.08em; line-height: 1; }
  .brand-mark { display: grid; place-items: center; width: 44px; height: 46px; border-radius: 12px 12px 12px 4px; background: var(--red); color: var(--white); font-family: var(--serif); font-size: 29px; letter-spacing: 0; }
  .brand-caption { display: block; margin-top: 7px; font-size: .49rem; letter-spacing: .2em; font-weight: 600; }
  .header-actions { display: flex; align-items: center; gap: 30px; }
  .header-note { font-family: var(--serif); color: var(--muted); font-size: .9rem; letter-spacing: .1em; }
  #main { width: min(1120px, calc(100% - 120px)); margin: 0 auto; padding: 58px 0 100px; min-height: calc(100dvh - 105px); outline: none; }
  .navigation { position: fixed; top: 32px; left: 50%; transform: translateX(-50%); display: flex; gap: 6px; z-index: 10; }
  .nav-button { appearance: none; border: 0; background: transparent; border-radius: 30px; color: var(--muted); min-height: 42px; padding: 10px 18px; display: flex; align-items: center; justify-content: center; gap: 7px; font-size: .83rem; font-weight: 600; }
  .nav-button:hover { color: var(--ink); background: #ecebdf; }
  .nav-button.active { background: var(--ink); color: var(--white); }
  .nav-icon { font-size: 1.15rem; line-height: 1; font-weight: 400; }
  .nav-count { font-size: .65rem; background: var(--red); color: white; min-width: 17px; padding: 0 4px; border-radius: 5px; }
  .network-status { position: relative; padding: 10px 24px; background: #ede5c5; text-align: center; font-size: .82rem; }
  .network-status .text-button { font-size: inherit; margin-left: 8px; }
  .hero { display: grid; grid-template-columns: 1.12fr 1fr; gap: 50px; padding: 8px 0 38px; align-items: center; }
  .hero-copy .eyebrow { margin-bottom: 20px; }
  .hero h1 { white-space: pre-line; max-width: 650px; }
  .hero-description { max-width: 420px; color: var(--muted); margin: 23px 0 27px; font-size: 1rem; line-height: 1.85; }
  .hero-footnote { margin-top: 12px; font-size: .72rem; color: var(--muted); }
  .hero-art { position: relative; height: 390px; overflow: hidden; border-radius: 48% 48% 5px 5px; background: #ebeade; isolation: isolate; }
  .art-circle { position: absolute; width: 275px; height: 275px; border: 1px solid #b7c2b0; border-radius: 50%; left: 50%; top: 49%; transform: translate(-50%, -50%); }
  .art-circle::before, .art-circle::after { content: ''; position: absolute; inset: 28px; border: 1px solid #c6cdbd; border-radius: 50%; }
  .art-circle::after { inset: 58px; }
  .art-sun { position: absolute; top: 37px; right: 49px; width: 100px; height: 100px; background: #ca563d; border-radius: 50%; }
  .art-kana { position: absolute; top: 16px; left: 50%; transform: translateX(-50%) rotate(-8deg); color: #344b3d; font-family: var(--serif); font-size: 255px; line-height: 1.4; font-weight: 500; }
  .art-note { position: absolute; left: 36px; top: 70px; writing-mode: vertical-rl; letter-spacing: .27em; font-size: .85rem; font-family: var(--serif); }
  .art-caption { position: absolute; bottom: 26px; left: 36px; letter-spacing: .16em; font-size: .56rem; color: #556551; }
  .progress-strip { display: flex; align-items: center; gap: 32px; margin: 22px 0 66px; border-block: 1px solid var(--line); padding: 25px 0; }
  .progress-intro { display: flex; align-items: center; gap: 14px; margin-right: auto; }
  .progress-intro strong { display: block; font-size: .88rem; font-weight: 600; }
  .progress-intro span:not(.tiny-sun) { display: block; font-size: .76rem; color: var(--muted); margin-top: 2px; }
  .tiny-sun { display: grid; place-items: center; width: 43px; height: 43px; flex: 0 0 auto; background: var(--rose); border-radius: 50%; color: var(--red); font-size: 32px; font-weight: 400; }
  .progress-stat { min-width: 100px; padding-left: 32px; border-left: 1px solid var(--line); }
  .progress-stat strong { display: block; font-family: var(--serif); font-size: 2rem; font-weight: 400; line-height: 1.1; }
  .progress-stat span { display: block; margin-top: 4px; font-size: .7rem; color: var(--muted); }
  .section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 27px; }
  .section-heading h2 { margin-top: 8px; }
  .section-heading > .quiet { flex-shrink: 0; font-size: .75rem; padding-bottom: 4px; }
  .unit-card { display: grid; grid-template-columns: 88px 1fr; padding: 30px 35px 32px 0; margin-bottom: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); }
  .unit-index { text-align: center; padding-top: 1px; font-family: var(--serif); font-size: 2rem; color: #949b8d; }
  .unit-meta { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; }
  .unit-meta > .quiet { font-size: .68rem; }
  .unit-card h3 { font-family: var(--serif); font-size: 1.7rem; letter-spacing: -.025em; }
  .unit-card p { color: var(--muted); font-size: .84rem; max-width: 670px; margin-top: 8px; }
  .lesson-links { display: grid; grid-template-columns: 1fr 1fr; gap: 0 26px; margin-top: 21px; }
  .editorial-note { display: flex; align-items: center; gap: 34px; margin-top: 48px; padding: 35px 42px; background: #e9ecdf; border-radius: 12px; }
  .editorial-ja { flex-shrink: 0; font-family: var(--serif); color: var(--green); font-size: 1.8rem; letter-spacing: .1em; }
  .editorial-note h3 { font-family: var(--serif); font-size: 1.5rem; }
  .editorial-note p { color: #5c695a; margin-top: 8px; font-size: .84rem; max-width: 620px; }
  .page-heading { margin: 6px 0 38px; }
  .page-heading h1 { margin: 14px 0 20px; font-size: clamp(2.5rem, 5vw, 4rem); }
  .lesson-topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 38px; font-size: .8rem; }
  .lesson-heading { max-width: 850px; margin-bottom: 40px; }
  .lesson-heading h1 { font-size: clamp(2.5rem, 5vw, 4.3rem); margin: 14px 0 20px; }
  .lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 64px; align-items: start; }
  .lesson-article { min-width: 0; }
  .lesson-sidebar { position: sticky; top: 32px; padding-left: 24px; border-left: 1px solid var(--line); }
  .lesson-sidebar h3 { margin: 10px 0 20px; font-family: var(--serif); font-size: 1.35rem; }
  .sidebar-note { margin-top: 24px; font-size: .74rem; color: var(--muted); }
  .lesson-section { margin: 42px 0; }
  .lesson-section h2 { margin-bottom: 21px; font-size: 1.9rem; }
  .lesson-prose { color: #4c564e; font-size: .98rem; line-height: 1.9; white-space: pre-line; }
  .vocabulary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .word-card { padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: 9px; }
  .word-ja { font-family: var(--serif); font-size: 1.8rem; line-height: 1.5; color: #344d3f; overflow-wrap: anywhere; }
  .kana { margin-top: 3px; color: var(--muted); font-size: .85rem; }
  .romaji { margin-top: 3px; color: var(--muted); font-size: .78rem; font-style: italic; }
  .word-en { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: .87rem; }
  .example-card { padding: 22px 26px; margin-bottom: 12px; border-left: 3px solid #aebda6; background: #eeeee3; border-radius: 0 8px 8px 0; }
  .example-ja { font-family: var(--serif); font-size: 1.35rem; line-height: 1.8; }
  .example-en { margin-top: 12px; font-size: .9rem; }
  .lesson-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 30px; margin-top: 40px; border-top: 1px solid var(--line); }
}

@layer components {
  .button { appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 13px 22px; border: 1px solid transparent; border-radius: 7px; background: #e9eade; color: var(--ink); text-decoration: none; font-size: .82rem; line-height: 1.4; font-weight: 650; transition: background .15s, transform .15s; }
  .button:hover:not(:disabled) { background: #dfe4d4; }
  .button:active:not(:disabled) { transform: translateY(1px); }
  .button-primary { background: var(--red); color: #fffaf5; }
  .button-primary:hover:not(:disabled) { background: var(--red-hover); }
  .button-outline { border-color: #bfc5b7; background: transparent; }
  .button-outline:hover:not(:disabled) { background: #eaece0; }
  .button-small { min-height: 38px; padding: 9px 18px; font-size: .75rem; }
  .text-button { border: none; background: none; color: var(--red); font-size: .82rem; font-weight: 600; padding: 9px 0; min-height: 40px; text-align: left; text-underline-offset: 4px; }
  .text-button:hover { text-decoration: underline; }
  .button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
  .avatar-button { border: 1px solid #b9c5ae; border-radius: 30px; min-height: 38px; max-width: 150px; padding: 8px 16px; background: #e6eadc; color: var(--green); font-size: .78rem; font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .lesson-link { appearance: none; display: flex; align-items: center; gap: 10px; min-height: 50px; border: 0; border-bottom: 1px solid var(--line); padding: 9px 0; color: var(--ink); background: transparent; text-align: left; font-size: .8rem; }
  .lesson-link:hover { color: var(--red); }
  .lesson-dot { display: grid; place-items: center; flex: 0 0 auto; width: 22px; height: 22px; border: 1px solid #d0d6c9; border-radius: 50%; font-size: .65rem; color: #74836d; }
  .lesson-dot.done { background: var(--soft-green); border-color: #aebda6; color: var(--green); }
  .lesson-arrow { margin-left: auto; font-size: 1rem; color: #8e9988; }
  .sidebar-lesson { display: flex; align-items: center; gap: 10px; width: 100%; min-height: 44px; padding: 10px 12px; margin: 4px 0; border: 0; border-radius: 6px; background: transparent; color: var(--muted); font-size: .77rem; text-align: left; }
  .sidebar-lesson span { color: var(--green); font-size: .9rem; }
  .sidebar-lesson.selected { background: #e8ebdf; color: var(--ink); font-weight: 600; }
  .sidebar-lesson:hover { background: #eeeee4; }
  .objectives-card { padding: 24px 28px; border: 1px solid #cfd9c6; border-radius: 10px; background: #eef0e5; }
  .objectives-card ul { margin-top: 14px; font-size: .88rem; color: #4b5d49; }
  .completion-badge { display: inline-block; margin-top: 22px; background: var(--soft-green); color: var(--green); border: 1px solid #c3d2bc; border-radius: 20px; padding: 6px 12px; font-size: .75rem; }
  .speak-invitation { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px; border: 1px solid #d9cbbc; border-radius: 10px; background: #f1e9dd; margin: 40px 0; }
  .speak-invitation h2 { margin-top: 7px; font-size: 1.5rem; }
  .speak-invitation .button { flex-shrink: 0; }
  .invitation-ja { margin-top: 15px; color: var(--red); font-size: 1.15rem; }
  .quiz-section { padding: 34px 30px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); margin-top: 45px; }
  .quiz-section h2 { margin: 8px 0 12px; }
  .quiz-section > p { font-size: .84rem; }
  .quiz-question { border: 0; margin: 32px 0; padding: 0; min-width: 0; }
  .quiz-question legend { padding: 0; font-size: .96rem; font-weight: 600; line-height: 1.7; width: 100%; }
  .question-number { margin-right: 12px; color: var(--red); font-size: .73rem; letter-spacing: .08em; }
  .quiz-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 15px; }
  .quiz-choice { display: flex; align-items: center; gap: 10px; padding: 12px 14px; min-height: 49px; background: var(--paper); border: 1px solid var(--line); border-radius: 7px; font-size: .84rem; cursor: pointer; }
  .quiz-choice:has(input:checked) { border-color: var(--red); background: #f4e8df; }
  .quiz-choice:has(input:focus-visible) { outline: 3px solid var(--green); outline-offset: 2px; }
  .answer-feedback { margin-top: 12px; font-size: .81rem; color: #6e4938; padding: 10px 13px; border-radius: 5px; background: #f5eee0; }
  .question-correct .answer-feedback { color: var(--green); background: var(--soft-green); }
  .quiz-result { padding: 20px; margin: 20px 0; background: #f5eee0; border-radius: 7px; color: #714e2d; }
  .quiz-result.passed { background: var(--soft-green); color: var(--green); }
  .quiz-result strong { font-size: .98rem; }
  .quiz-result p { font-size: .83rem; margin-top: 8px; }
  .notice { padding: 15px 18px; border: 1px solid #d1d9c5; background: #edf0e4; border-radius: 7px; font-size: .83rem; color: #4f6246; margin: 16px 0; line-height: 1.65; }
  .notice-error { color: #963b2a; background: #f6e7df; border-color: #dfbdae; overflow-wrap: anywhere; }
  .empty-state { display: flex; flex-direction: column; align-items: center; text-align: center; max-width: 700px; margin: 30px auto; padding: 50px 32px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
  .empty-state h2 { margin: 12px 0 15px; font-size: 2.25rem; }
  .empty-state p { color: var(--muted); max-width: 480px; font-size: .92rem; margin-bottom: 24px; }
  .empty-symbol { display: grid; place-items: center; width: 90px; height: 90px; flex-shrink: 0; margin-bottom: 24px; border-radius: 50%; background: #e9ecde; color: var(--green); font-family: var(--serif); font-size: 2.9rem; }
  .review-workspace { width: min(100%, 750px); margin: 0 auto; }
  .review-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; font-size: .8rem; color: var(--muted); }
  .review-card { display: flex; align-items: center; flex-direction: column; justify-content: center; text-align: center; min-height: 370px; padding: 30px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); box-shadow: 0 6px 0 -1px #ebe9df, 0 7px 0 0 #deded2; }
  .card-instruction { font-size: .8rem; color: var(--muted); margin-bottom: 20px; }
  .review-ja { font-family: var(--serif); font-size: clamp(2.7rem, 8vw, 4.5rem); line-height: 1.6; color: var(--green); overflow-wrap: anywhere; }
  .review-card .button { margin-top: 30px; }
  .review-answer { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 16px; width: min(100%, 300px); }
  .review-en { font-family: var(--serif); font-size: 1.65rem; margin-top: 12px; }
  .review-ratings { margin: 35px 0 15px; text-align: center; }
  .review-ratings > p:first-child { font-size: .9rem; margin-bottom: 14px; }
  .rating-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
  .rating-button { display: flex; flex-direction: column; align-items: center; gap: 4px; min-height: 74px; padding: 14px 6px; background: #fffaf1; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); }
  .rating-button strong { font-weight: 600; font-size: .88rem; }
  .rating-button span { color: var(--muted); font-size: .68rem; }
  .rating-button:hover { background: #edeedf; border-color: #a4b494; }
  .rating-again strong { color: var(--red); }
  .rating-easy strong, .rating-good strong { color: var(--green); }
  .speaking-selector { display: flex; align-items: center; gap: 20px; padding: 0 0 25px; }
  .speaking-selector label { font-size: .8rem; font-weight: 600; color: var(--muted); }
  .speaking-selector select { width: min(440px, 100%); }
  .speaking-card, .conversation-card { padding: 35px 38px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); margin-bottom: 26px; }
  .conversation-card { background: #eef0e5; border-color: #d5ddcb; }
  .card-header { display: flex; align-items: center; gap: 18px; margin-bottom: 24px; }
  .card-header h2 { margin-top: 5px; font-size: 1.9rem; }
  .step-label { display: grid; place-items: center; flex: 0 0 auto; width: 46px; height: 46px; border: 1px solid #c8cfc0; border-radius: 50%; font-family: var(--serif); color: var(--green); font-size: 1.3rem; }
  .speaking-target { padding: 26px 28px; background: var(--paper); border-radius: 8px; margin-bottom: 22px; }
  .target-ja { color: var(--green); font-family: var(--serif); font-size: clamp(1.6rem, 3.2vw, 2.3rem); line-height: 1.7; overflow-wrap: anywhere; }
  .target-en { margin-top: 14px; font-size: .92rem; }
  .coaching-list { color: #5a6657; font-size: .85rem; margin: 20px 0; }
  .audio-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin: 23px 0 18px; }
  .device-voice-controls { margin: 18px 0 25px; }
  .device-voice-controls .button-row { margin-top: 0; }
  .device-voice-controls p { margin-top: 10px; }
  .recording-indicator { color: var(--red); font-size: .85rem; }
  .recording-playback { display: block; width: 100%; max-width: 500px; margin: 20px 0; }
  .assessment-result { padding: 25px; background: #edf0e6; border-radius: 8px; margin-top: 22px; }
  .score-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 20px 0; }
  .score-grid > div { display: flex; flex-direction: column; }
  .score-grid strong { font-family: var(--serif); font-size: 2.8rem; color: var(--green); font-weight: 400; line-height: 1.2; }
  .score-grid span { font-size: .75rem; color: var(--muted); }
  .assessed-words { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
  .assessed-word { background: #fffcf6; border: 1px solid var(--line); padding: 5px 9px; border-radius: 5px; font-size: .8rem; }
  .mode-switch { display: inline-flex; flex-wrap: wrap; gap: 4px; border: 1px solid #ccd4c2; border-radius: 8px; padding: 4px; margin: 22px 0; }
  .mode-button { min-height: 40px; padding: 9px 18px; border: none; border-radius: 5px; background: transparent; color: var(--muted); font-size: .8rem; }
  .mode-button.active { background: var(--white); color: var(--green); box-shadow: 0 1px 4px #2433200d; }
  .roleplay-scenario { padding: 22px 25px; margin-bottom: 22px; border: 1px solid #cbd6c0; border-radius: 8px; }
  .roleplay-scenario h3 { margin-top: 9px; }
  .roleplay-scenario p { font-size: .88rem; margin-top: 9px; }
  .roleplay-opening { color: var(--green); }
  .voice-status { display: flex; align-items: center; gap: 9px; font-size: .8rem; color: var(--muted); margin-top: 10px; }
  .status-dot { width: 7px; height: 7px; border-radius: 50%; background: #a0a995; flex: 0 0 auto; }
  .voice-status.live .status-dot { background: var(--red); box-shadow: 0 0 0 4px #b8402c15; }
  .voice-status.live { color: var(--red); }
  .voice-timer { margin-left: auto; font-variant-numeric: tabular-nums; white-space: nowrap; }
  .conversation-transcript:empty { display: none; }
  .conversation-transcript { max-height: 340px; overflow-y: auto; overscroll-behavior: contain; padding: 8px 0; margin: 24px 0; border-top: 1px solid #d3dac9; border-bottom: 1px solid #d3dac9; }
  .transcript-line { display: grid; grid-template-columns: 55px 1fr; gap: 12px; margin: 15px 0; font-size: .9rem; }
  .transcript-role { font-size: .65rem; color: var(--green); text-transform: uppercase; font-weight: 700; letter-spacing: .07em; padding-top: 4px; }
  .transcript-line.learner .transcript-role { color: var(--red); }
  .transcript-line p { white-space: pre-wrap; overflow-wrap: anywhere; }
  .reflection { margin-top: 28px; padding: 25px; background: var(--white); border: 1px solid #d3dac9; border-radius: 8px; }
  .reflection h3 { font-family: var(--serif); font-size: 1.65rem; margin: 8px 0 16px; }
  .reflection h4 { margin: 20px 0 10px; }
  .reflection p, .reflection li { font-size: .88rem; }
  .reflection .small { font-size: .76rem; margin-top: 24px; }
  .privacy-note { max-width: 850px; margin: 28px auto; text-align: center; color: var(--muted); font-size: .74rem; }
  .profile-welcome { display: flex; align-items: center; gap: 35px; padding: 45px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); margin-bottom: 35px; }
  .profile-welcome .empty-symbol { margin: 0; }
  .profile-welcome h2 { margin-bottom: 15px; }
  .profile-welcome p { color: var(--muted); max-width: 680px; }
  .profile-card { padding: 32px 35px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; margin: 25px 0; }
  .profile-card h2 { margin: 8px 0 16px; }
  .profile-card > p { font-size: .88rem; color: var(--muted); }
  .completed-lessons { margin-top: 24px; }
  .completed-lesson { width: 100%; display: flex; align-items: center; gap: 12px; min-height: 53px; background: transparent; border: none; border-top: 1px solid var(--line); color: var(--ink); padding: 12px 0; text-align: left; font-size: .88rem; }
  .completed-lesson:hover { color: var(--red); }
  .completed-lesson span:first-child { color: var(--green); }
  .completed-lesson span:last-child { margin-left: auto; }
  .account-card { display: grid; grid-template-columns: 1fr auto; gap: 12px 30px; align-items: center; }
  .account-card h2 { margin-bottom: 5px; }
  .account-card > p { grid-column: 1 / -1; }
  .install-card { display: grid; grid-template-columns: 1fr auto; gap: 20px 40px; align-items: center; padding: 35px; border: 1px solid #d4d9c7; background: #eaeede; border-radius: 12px; margin-top: 35px; }
  .install-card h2 { margin: 8px 0 18px; }
  .install-card p { color: #5a6852; font-size: .84rem; }
  .install-instructions { max-width: 340px; border-left: 1px solid #c8d1bb; padding-left: 25px; }
  .install-instructions p { font-size: .77rem; }
  .profile-fineprint { padding-top: 25px; max-width: 800px; font-size: .76rem; color: var(--muted); }
  .auth-dialog { width: min(480px, calc(100% - 32px)); max-height: calc(100dvh - 32px); padding: 38px; border: 1px solid #dbddd0; background: var(--paper); color: var(--ink); border-radius: 16px; box-shadow: 0 30px 110px #1c2b2250; overflow: auto; }
  .auth-dialog::backdrop { background: #26352b80; backdrop-filter: blur(4px); }
  .auth-dialog h2 { margin: 12px 0; font-size: 2.3rem; }
  .auth-dialog > p { font-size: .86rem; }
  .dialog-close { position: absolute; right: 14px; top: 10px; border: none; background: transparent; color: var(--muted); width: 40px; height: 40px; font-size: 1.65rem; }
  .auth-tabs { display: flex; border-bottom: 1px solid var(--line); margin: 22px 0; }
  .auth-tab { flex: 1; min-height: 43px; border: 0; border-bottom: 2px solid transparent; background: none; color: var(--muted); font-size: .84rem; padding: 10px; }
  .auth-tab.active { border-bottom-color: var(--red); color: var(--red); font-weight: 600; }
  .auth-form { margin-top: 22px; }
  .form-field { display: flex; flex-direction: column; gap: 7px; margin: 17px 0 0; }
  .form-field > span { font-size: .8rem; font-weight: 600; }
  .form-field input { width: 100%; font-size: 16px; }
  .field-hint { font-size: .68rem; color: var(--muted); margin: 6px 0 12px; }
  .auth-form > .button { width: 100%; margin-top: 16px; }
  .auth-feedback { color: #963b2a; font-size: .8rem; margin-top: 16px; }
  .auth-feedback:empty { margin: 0; }
  .auth-dialog > .text-button { display: block; margin: 10px 0; }
  .recovery-code { padding: 20px; border: 1px dashed #afbaa2; border-radius: 8px; background: var(--white); color: var(--green); font-family: ui-monospace, monospace; font-size: 1.1rem; overflow-wrap: anywhere; margin: 24px 0 16px; user-select: all; }
  .recovery-acknowledgement { display: flex; align-items: flex-start; gap: 10px; font-size: .82rem; margin: 25px 0; }
  .recovery-acknowledgement input { margin-top: 4px; }
  .initial-loading { min-height: 50dvh; display: flex; justify-content: center; align-items: center; flex-direction: column; gap: 18px; color: var(--muted); font-family: var(--serif); font-size: 1.2rem; }
  .loading-ring { width: 34px; height: 34px; border: 2px solid var(--line); border-top-color: var(--red); border-radius: 50%; animation: turn 1s linear infinite; }
  @keyframes turn { to { transform: rotate(360deg); } }
}

@layer responsive {
  @media (min-width: 1500px) { .site-header { max-width: 1360px; } #main { width: min(1160px, calc(100% - 120px)); } }
  @media (max-width: 1150px) {
    .site-header { padding-inline: 36px; }
    #main { width: calc(100% - 72px); }
    .header-note { display: none; }
    .hero { gap: 36px; }
    .hero-art { height: 360px; }
    .progress-strip { gap: 18px; }
    .progress-stat { padding-left: 22px; min-width: 85px; }
    .lesson-layout { grid-template-columns: minmax(0, 1fr) 200px; gap: 36px; }
    .speak-invitation { display: block; }
    .speak-invitation .button { margin-top: 22px; }
  }
  @media (max-width: 850px) {
    .site-header { min-height: 88px; padding: 20px 28px; }
    .brand { font-size: 1.5rem; }
    .brand-caption { font-size: .45rem; }
    .brand-mark { width: 39px; height: 41px; font-size: 26px; }
    #main { width: calc(100% - 56px); padding: 38px 0 calc(105px + env(safe-area-inset-bottom)); }
    .navigation { top: auto; bottom: 0; width: 100%; gap: 0; justify-content: center; padding: 9px 16px calc(9px + env(safe-area-inset-bottom)); background: #f7f4ecf5; border-top: 1px solid #d7dace; backdrop-filter: blur(16px); }
    .nav-button { flex: 1; max-width: 155px; flex-direction: column; border-radius: 9px; min-height: 52px; gap: 5px; padding: 7px 12px; font-size: .66rem; position: relative; }
    .nav-button.active { background: #e9ecde; color: var(--green); }
    .nav-icon { font-size: 1.35rem; }
    .nav-count { position: absolute; top: 2px; left: calc(50% + 8px); }
    .hero { grid-template-columns: 1.15fr 1fr; gap: 24px; }
    .hero h1 { font-size: clamp(2.45rem, 5.8vw, 3.5rem); }
    .hero-art { height: 330px; }
    .art-kana { font-size: 220px; top: 14px; }
    .art-circle { width: 220px; height: 220px; }
    .art-sun { width: 80px; height: 80px; top: 37px; right: 24px; }
    .art-note { left: 23px; font-size: .72rem; top: 65px; }
    .art-caption { left: 24px; font-size: .45rem; }
    .hero-description { font-size: .87rem; }
    .hero-copy .eyebrow { font-size: .57rem; margin-bottom: 16px; }
    .progress-strip { flex-wrap: wrap; margin-bottom: 45px; }
    .progress-intro { width: 100%; margin-bottom: 7px; }
    .progress-stat { flex: 1; border: none; padding-left: 0; }
    .progress-stat + .progress-stat { border-left: 1px solid var(--line); padding-left: 25px; }
    .unit-card { grid-template-columns: 65px 1fr; padding-right: 25px; }
    .unit-index { font-size: 1.7rem; }
    .editorial-note { gap: 23px; padding: 28px; }
    .editorial-ja { font-size: 1.4rem; }
    .lesson-layout { display: block; }
    .lesson-sidebar { display: none; }
    .lesson-heading { margin-bottom: 32px; }
    .lesson-topbar { margin-bottom: 28px; }
    .lesson-section { margin: 35px 0; }
    .speak-invitation { display: flex; }
    .speak-invitation .button { margin: 0; }
    .section-heading { align-items: start; }
    .section-heading > .quiet { max-width: 150px; text-align: right; padding-top: 5px; }
    .install-card { grid-template-columns: 1fr; }
    .install-instructions { max-width: none; border-left: none; border-top: 1px solid #c8d1bb; padding: 22px 0 0; }
  }
  @media (max-width: 600px) {
    .site-header { padding: 17px 20px; min-height: 80px; padding-top: max(17px, env(safe-area-inset-top)); }
    .brand { gap: 10px; font-size: 1.5rem; }
    .brand-caption { font-size: .42rem; letter-spacing: .15em; }
    .header-actions { gap: 0; }
    .button-small { padding: 8px 14px; min-height: 38px; }
    .avatar-button { max-width: 110px; padding: 8px 12px; }
    #main { width: calc(100% - 40px); padding-top: 31px; }
    .hero { display: flex; flex-direction: column; align-items: stretch; gap: 24px; padding-top: 3px; padding-bottom: 6px; }
    .hero h1 { font-size: clamp(2.9rem, 11.5vw, 4rem); line-height: 1.06; max-width: 500px; }
    .hero-copy .eyebrow { font-size: .58rem; margin-bottom: 18px; }
    .hero-description { font-size: .9rem; line-height: 1.8; margin: 20px 0 23px; max-width: 365px; }
    .hero-footnote { font-size: .67rem; margin-top: 9px; }
    .hero-art { height: 210px; border-radius: 110px 110px 6px 6px; max-width: 440px; margin-top: 4px; }
    .art-kana { font-size: 190px; top: -27px; left: 57%; }
    .art-circle { width: 205px; height: 205px; left: 55%; top: 50%; }
    .art-sun { width: 65px; height: 65px; top: 21px; right: 49px; }
    .art-note { writing-mode: initial; top: 136px; left: 23px; letter-spacing: .15em; font-size: .68rem; }
    .art-caption { bottom: 20px; left: 24px; font-size: .43rem; }
    .progress-strip { gap: 18px 12px; padding: 23px 0; margin: 28px 0 40px; }
    .progress-stat { min-width: 0; }
    .progress-stat + .progress-stat { padding-left: 20px; }
    .progress-stat strong { font-size: 1.75rem; }
    .progress-stat span { font-size: .6rem; white-space: nowrap; }
    .progress-intro strong { font-size: .83rem; }
    .progress-intro span:not(.tiny-sun) { font-size: .7rem; }
    .tiny-sun { width: 38px; height: 38px; font-size: 28px; }
    .section-heading { gap: 14px; margin-bottom: 23px; }
    .section-heading h2 { font-size: 1.9rem; }
    .section-heading > .quiet { max-width: 110px; font-size: .63rem; padding-top: 28px; }
    .unit-card { grid-template-columns: 1fr; padding: 24px 22px; position: relative; margin-bottom: 14px; }
    .unit-index { position: absolute; top: 17px; right: 20px; font-size: 1.7rem; opacity: .7; }
    .unit-meta { padding-right: 32px; margin-bottom: 13px; }
    .unit-meta .eyebrow { font-size: .59rem; }
    .unit-meta > .quiet { font-size: .6rem; }
    .unit-card h3 { font-size: 1.6rem; padding-right: 0; }
    .unit-card p { font-size: .8rem; line-height: 1.8; }
    .lesson-links { grid-template-columns: 1fr; margin-top: 16px; }
    .lesson-link { font-size: .78rem; min-height: 49px; }
    .editorial-note { display: block; padding: 28px; margin-top: 32px; }
    .editorial-ja { display: block; font-size: 1.55rem; margin-bottom: 17px; }
    .editorial-note h3 { font-size: 1.45rem; }
    .editorial-note p { font-size: .79rem; }
    .page-heading { margin: 2px 0 30px; }
    .page-heading h1 { font-size: 2.8rem; line-height: 1.07; margin-top: 14px; }
    .lead { font-size: .92rem; line-height: 1.8; }
    .lesson-topbar { font-size: .68rem; margin-bottom: 26px; }
    .lesson-topbar .text-button { font-size: .76rem; }
    .lesson-heading .eyebrow { font-size: .58rem; line-height: 1.8; }
    .lesson-heading h1 { font-size: 2.65rem; line-height: 1.15; margin: 12px 0 18px; }
    .objectives-card { padding: 22px; }
    .objectives-card ul { font-size: .82rem; }
    .lesson-prose { font-size: .91rem; line-height: 1.9; }
    .lesson-section h2 { font-size: 1.75rem; margin-bottom: 18px; }
    .vocabulary-grid { gap: 10px; }
    .word-card { padding: 17px 15px; }
    .word-ja { font-size: 1.5rem; }
    .kana { font-size: .74rem; }
    .romaji { font-size: .71rem; }
    .word-en { font-size: .78rem; margin-top: 12px; padding-top: 10px; }
    .example-card { padding: 18px 20px; }
    .example-ja { font-size: 1.2rem; }
    .example-en { font-size: .82rem; }
    .speak-invitation { display: block; padding: 24px; }
    .speak-invitation h2 { font-size: 1.5rem; }
    .speak-invitation .button { margin-top: 23px; }
    .invitation-ja { font-size: 1.05rem; }
    .quiz-section { padding: 27px 20px; margin-top: 32px; }
    .quiz-section h2 { font-size: 1.9rem; }
    .quiz-question { margin: 28px 0; }
    .quiz-question legend { font-size: .88rem; }
    .quiz-choices { grid-template-columns: 1fr; gap: 8px; }
    .quiz-choice { font-size: .82rem; }
    .answer-feedback { font-size: .76rem; }
    .quiz-section > .button { width: 100%; }
    .lesson-footer { align-items: stretch; gap: 12px; }
    .lesson-footer .button { padding: 12px 16px; font-size: .76rem; }
    .lesson-footer .text-button { font-size: .74rem; }
    .review-card { min-height: 340px; padding: 25px 18px; }
    .review-ja { font-size: 3.25rem; }
    .rating-buttons { gap: 7px; }
    .rating-button { padding: 12px 4px; }
    .rating-button strong { font-size: .79rem; }
    .rating-button span { font-size: .57rem; }
    .empty-state { padding: 34px 23px; margin-top: 10px; }
    .empty-state h2 { font-size: 1.95rem; }
    .empty-state p { font-size: .85rem; }
    .empty-symbol { width: 77px; height: 77px; font-size: 2.5rem; }
    .speaking-selector { display: block; padding-bottom: 23px; }
    .speaking-selector label { display: block; font-size: .75rem; margin-bottom: 8px; }
    .speaking-selector select { width: 100%; font-size: 16px; }
    .speaking-card, .conversation-card { padding: 27px 21px; }
    .card-header { gap: 13px; margin-bottom: 22px; align-items: flex-start; }
    .card-header h2 { font-size: 1.6rem; line-height: 1.2; }
    .card-header .eyebrow { font-size: .58rem; }
    .step-label { width: 36px; height: 36px; font-size: 1.1rem; margin-top: 5px; }
    .speaking-target { padding: 20px 18px; }
    .target-ja { font-size: 1.6rem; }
    .target-en { font-size: .84rem; }
    .coaching-list { font-size: .79rem; }
    .conversation-card > p { font-size: .87rem; }
    .mode-switch { display: flex; }
    .mode-button { flex: 1; padding: 10px 8px; font-size: .7rem; }
    .roleplay-scenario { padding: 20px; }
    .voice-status { font-size: .72rem; flex-wrap: wrap; }
    .voice-timer { font-size: .68rem; }
    .audio-controls .button { width: 100%; }
    .score-grid { gap: 12px; }
    .score-grid strong { font-size: 2.3rem; }
    .score-grid span { font-size: .66rem; }
    .assessment-result { padding: 20px; }
    .transcript-line { grid-template-columns: 43px 1fr; gap: 7px; font-size: .84rem; }
    .transcript-role { font-size: .56rem; }
    .reflection { padding: 21px; }
    .reflection h3 { font-size: 1.5rem; }
    .profile-welcome { padding: 28px; flex-direction: column; align-items: flex-start; gap: 20px; }
    .profile-welcome h2 { font-size: 1.85rem; }
    .profile-welcome p { font-size: .87rem; }
    .profile-welcome .button-row { width: 100%; }
    .profile-welcome .button-row .button { flex: 1; padding-inline: 15px; font-size: .76rem; }
    .profile-card { padding: 27px 23px; }
    .account-card { gap: 15px; }
    .account-card h2 { font-size: 1.75rem; overflow-wrap: anywhere; }
    .account-card .button { min-height: 43px; padding: 10px 14px; font-size: .74rem; }
    .completed-lesson { font-size: .79rem; gap: 9px; }
    .install-card { padding: 28px 24px; }
    .install-card h2 { font-size: 1.85rem; }
    .auth-dialog { padding: 34px 24px 27px; }
    .auth-dialog h2 { font-size: 2rem; }
    .auth-dialog .eyebrow { font-size: .59rem; }
    .auth-dialog > p { font-size: .82rem; }
    .auth-dialog > .button:last-child { width: 100%; font-size: .76rem; }
    .recovery-code { font-size: 1rem; padding: 17px; }
    .network-status { padding: 10px 18px; font-size: .74rem; text-align: left; }
  }
  @media (max-width: 360px) {
    #main { width: calc(100% - 32px); }
    .site-header { padding-inline: 16px; }
    .hero h1 { font-size: 2.8rem; }
    .unit-card { padding-inline: 19px; }
    .progress-stat + .progress-stat { padding-left: 12px; }
    .progress-stat span { font-size: .56rem; }
    .vocabulary-grid { grid-template-columns: 1fr; }
    .word-card { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 2px 12px; }
    .word-ja { grid-column: 1; }
    .word-en { grid-column: 2; grid-row: 1 / 4; border: 0; padding: 0; margin: 0; }
    .word-card .kana, .word-card .romaji { grid-column: 1; }
    .brand-caption { display: none; }
    .rating-button span { font-size: .53rem; }
  }
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; transition-duration: .001ms !important; }
  }
  @media (max-width: 600px) {
    .hero-example { padding: 25px; }
    .hero-example .hero-english { font-size: 2.5rem; }
    .hero-copy .button-row { gap: 10px; }
    .hero-copy .button-row .button { width: 100%; }
    .lesson-steps { align-items: stretch; gap: 8px; }
    .lesson-steps .button { flex-grow: 1; }
    .beginner-phrase .phrase-english { font-size: .91rem; }
    .beginner-phrase .phrase-romaji { font-size: .91rem; }
    .script-preference { font-size: .76rem; }
    .script-details { font-size: .75rem; }
    .tutor-plan { font-size: .82rem; padding: 18px 18px 18px 36px; }
    .tutor-help .button { flex: 1 1 44%; padding-inline: 10px; }
    .tutor-next { align-items: stretch; }
    .tutor-next .button { width: 100%; }
    .review-prompt { font-size: 1.9rem; }
  }
  @media (max-width: 360px) {
    .word-card.beginner-phrase { display: block; }
  }
}