:root {
  --ink: #17323c;
  --muted: #57717a;
  --paper: #f4fafb;
  --surface: #ffffff;
  --line: #c9dde2;
  --ocean: #176b87;
  --ocean-dark: #0e526c;
  --ocean-soft: #dff3f8;
  --coral: #e75e50;
  --coral-dark: #b94036;
  --coral-soft: #ffe8e2;
  --sun: #f3bd36;
  --leaf: #2e8265;
  --danger: #a62d38;
  --shadow: 0 12px 34px rgba(23, 50, 60, .12);
  --radius: 22px;
  --font-display: "Hiragino Maru Gothic ProN", "Yu Gothic UI", Meiryo, sans-serif;
  --font-body: "BIZ UDPGothic", "Yu Gothic UI", Meiryo, sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); font-family: var(--font-body); scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: radial-gradient(circle at 1px 1px, rgba(23,107,135,.09) 1px, transparent 1.5px) 0 0 / 26px 26px, var(--paper); }
button, input { font: inherit; }
button { min-width: 44px; min-height: 44px; cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 4px solid var(--sun); outline-offset: 3px; }
[hidden] { display: none !important; }

.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; min-height: 44px; padding: 12px 18px; background: var(--ink); color: white; border-radius: 12px; transform: translateY(-140%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; justify-content: space-between; gap: 14px; min-height: 72px; padding: max(10px, env(safe-area-inset-top)) clamp(16px, 4vw, 54px) 10px; background: rgba(244,250,251,.94); border-bottom: 1px solid rgba(23,107,135,.18); backdrop-filter: blur(14px); }
.brand-button { display: flex; align-items: center; gap: 10px; padding: 3px 8px 3px 3px; color: var(--ink); background: transparent; border: 0; text-align: left; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50% 50% 46% 54%; background: var(--ocean); color: white; font-size: 30px; font-weight: 900; transform: rotate(-9deg); }
.brand-button strong, .brand-button small { display: block; }
.brand-button strong { font: 800 16px/1.15 var(--font-display); letter-spacing: .02em; }
.brand-button small { margin-top: 3px; color: var(--muted); font-size: 12px; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.sync-pill { display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 7px 12px; border-radius: 999px; background: #e5f4ec; color: #1d674d; font-size: 12px; font-weight: 700; }
.sync-pill > span { color: var(--leaf); }
.sync-pill.is-waiting { background: #fff3d2; color: #795800; }
.sync-pill.is-error { background: #ffe8ea; color: var(--danger); }

main { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: clamp(28px, 5vw, 72px) 0 max(80px, env(safe-area-inset-bottom)); }
.view { animation: view-in .32s ease both; }
@keyframes view-in { from { opacity: 0; transform: translateY(8px); } }
.eyebrow { margin: 0 0 8px; color: var(--ocean); font-size: 12px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--font-display); }

.welcome-view { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr); align-items: center; gap: clamp(34px, 7vw, 90px); min-height: calc(100vh - 170px); }
.welcome-copy h1 { margin: 0; max-width: 760px; font-size: clamp(36px, 6.2vw, 76px); line-height: 1.12; letter-spacing: -.045em; }
.welcome-copy h1 span { color: var(--coral-dark); }
.welcome-lead { max-width: 620px; margin: 24px 0; color: var(--muted); font-size: clamp(18px, 2vw, 22px); line-height: 1.9; }
.welcome-actions, .mission-actions, .dashboard-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.primary-button, .secondary-button, .quiet-button, .google-button, .back-button { border-radius: 14px; font-weight: 800; transition: transform .15s ease, box-shadow .15s ease, background .15s ease; }
.primary-button { padding: 13px 22px; border: 2px solid var(--ocean); background: var(--ocean); color: white; box-shadow: 0 7px 0 var(--ocean-dark); }
.primary-button:hover { transform: translateY(-2px); }
.primary-button:active { transform: translateY(5px); box-shadow: 0 2px 0 var(--ocean-dark); }
.primary-button:disabled { cursor: not-allowed; opacity: .45; box-shadow: none; transform: none; }
.secondary-button { padding: 12px 20px; border: 2px solid var(--ocean); background: white; color: var(--ocean-dark); }
.quiet-button, .back-button { padding: 10px 14px; border: 1px solid var(--line); background: rgba(255,255,255,.78); color: var(--ink); }
.back-button { margin-bottom: 22px; }
.google-button { display: inline-flex; align-items: center; gap: 12px; padding: 12px 18px; border: 1px solid #9fb6bd; background: white; color: var(--ink); }
.google-button span { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: #4285f4; color: white; }
.privacy-line { display: flex; align-items: flex-start; gap: 8px; margin-top: 22px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.privacy-line span { color: var(--leaf); }

.route-preview { position: relative; display: grid; gap: 18px; padding: 34px 0; }
.route-card { position: relative; padding: 28px 30px 26px 112px; border: 2px solid; border-radius: 32px 19px 32px 20px; background: white; box-shadow: var(--shadow); transform: rotate(-1.4deg); }
.route-card--intro { border-color: var(--ocean); }
.route-card--practice { border-color: var(--coral); transform: rotate(1.4deg); }
.route-number { position: absolute; left: 26px; top: 20px; font: 900 58px/1 var(--font-display); }
.route-card--intro .route-number { color: var(--ocean); }
.route-card--practice .route-number { color: var(--coral); }
.route-unit { position: absolute; left: 31px; top: 77px; color: var(--muted); font-size: 11px; font-weight: 800; }
.route-card h2 { margin: 0 0 8px; font-size: 24px; }
.route-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.route-join { display: flex; justify-content: center; gap: 16px; height: 26px; }
.route-join i { width: 11px; height: 11px; border-radius: 50%; background: var(--sun); }
.route-join i:nth-child(2) { margin-top: 9px; }

.learner-banner { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 24px; padding: 22px 26px; border: 2px solid var(--ink); border-radius: var(--radius); background: white; box-shadow: 7px 7px 0 var(--ink); }
.learner-identity { display: flex; align-items: center; gap: 17px; }
.learner-avatar { display: grid; place-items: center; width: 72px; height: 72px; border-radius: 24px 36px 22px 34px; background: var(--sun); font-size: 40px; }
.learner-identity h1 { margin: 0; font-size: clamp(24px, 4vw, 38px); }
.overall-progress { display: grid; text-align: right; }
.overall-progress strong { color: var(--ocean); font: 900 clamp(28px, 4vw, 44px)/1 var(--font-display); }
.overall-progress span { margin-top: 6px; color: var(--muted); font-size: 12px; font-weight: 800; }
.trail-key { display: flex; gap: 18px; margin: 30px 0; color: var(--muted); font-size: 13px; font-weight: 800; }
.trail-key span { display: flex; align-items: center; gap: 8px; }
.key-dot { width: 14px; height: 14px; border-radius: 50%; }
.key-dot--intro { background: var(--ocean); }
.key-dot--practice { background: var(--coral); }
.course-section { position: relative; margin: 36px 0 68px; padding: clamp(22px, 4vw, 40px); border-radius: 32px; background: rgba(255,255,255,.76); border: 1px solid var(--line); overflow: hidden; }
.course-section::before { content: ""; position: absolute; left: 53px; top: 148px; bottom: 50px; width: 6px; border-radius: 3px; opacity: .2; }
.course-section--intro::before { background: var(--ocean); }
.course-section--practice::before { background: var(--coral); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.section-heading h2 { margin: 0; font-size: clamp(26px, 4vw, 42px); }
.section-heading p:not(.eyebrow) { margin: 8px 0 0; color: var(--muted); }
.section-heading > strong { white-space: nowrap; font: 900 22px/1 var(--font-display); }
.trail-grid { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.trail-card { position: relative; min-height: 156px; padding: 20px 16px 16px; border: 2px solid var(--line); border-radius: 20px; background: white; color: var(--ink); text-align: left; box-shadow: 0 5px 0 rgba(23,50,60,.12); }
.trail-card:hover { transform: translateY(-3px); }
.trail-card.is-complete { border-color: var(--leaf); background: #eff9f4; }
.trail-card.is-current { border-color: var(--sun); box-shadow: 0 0 0 4px rgba(243,189,54,.24), 0 5px 0 rgba(23,50,60,.12); }
.trail-card.is-locked { opacity: .62; }
.trail-card__top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 13px; }
.trail-card__number { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50% 50% 46% 54%; color: white; font-weight: 900; }
.course-section--intro .trail-card__number { background: var(--ocean); }
.course-section--practice .trail-card__number { background: var(--coral); }
.trail-card__icon { font-size: 25px; }
.trail-card h3 { margin: 0 0 8px; font-size: 17px; line-height: 1.45; }
.trail-card p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.55; }
.trail-card__done { position: absolute; right: 12px; bottom: 10px; color: var(--leaf); font-size: 18px; font-weight: 900; }

.mission-shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 22px; align-items: start; }
.mission-map { position: sticky; top: 100px; padding: 18px; border-radius: var(--radius); background: var(--ink); color: white; }
.phase-step { position: relative; display: grid; grid-template-columns: 35px 1fr; align-items: center; gap: 10px; min-height: 50px; color: #a9c2ca; font-size: 13px; font-weight: 800; }
.phase-step::after { content: ""; position: absolute; left: 16px; top: 39px; bottom: -10px; width: 2px; background: #45616a; }
.phase-step:last-child::after { display: none; }
.phase-step span:first-child { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 2px solid #607b84; }
.phase-step.is-active { color: white; }
.phase-step.is-active span:first-child { border-color: var(--sun); background: var(--sun); color: var(--ink); }
.phase-step.is-done { color: #a9e0ca; }
.phase-step.is-done span:first-child { border-color: var(--leaf); background: var(--leaf); color: white; }
.mission-card { min-height: 620px; overflow: hidden; border: 2px solid var(--ink); border-radius: 28px; background: white; box-shadow: 8px 8px 0 var(--ink); }
.mission-header { display: flex; align-items: center; gap: 18px; padding: clamp(22px, 4vw, 38px); background: var(--coral-soft); border-bottom: 2px solid var(--ink); }
.mission-heading-copy { min-width: 0; flex: 1; }
.speak-button { flex: 0 0 auto; padding: 10px 14px; border: 2px solid var(--ink); border-radius: 14px; background: white; color: var(--ink); font-weight: 900; }
.mission-icon { display: grid; place-items: center; flex: 0 0 auto; width: 76px; height: 76px; border-radius: 31px 22px 30px 20px; background: var(--coral); color: white; font-size: 38px; }
.mission-header h1 { margin: 0 0 8px; font-size: clamp(26px, 4vw, 42px); }
.mission-header p:last-child { margin: 0; color: var(--muted); line-height: 1.7; }
.mission-body { min-height: 360px; padding: clamp(24px, 5vw, 48px); }
.mission-body h2 { margin-top: 0; font-size: clamp(24px, 3vw, 34px); }
.mission-body > p { color: var(--muted); font-size: 18px; line-height: 1.8; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 24px; }
.choice-button { min-height: 66px; padding: 15px 17px; border: 2px solid var(--line); border-radius: 17px; background: white; color: var(--ink); font-weight: 800; text-align: left; }
.choice-button[aria-pressed="true"] { border-color: var(--ocean); background: var(--ocean-soft); box-shadow: 0 0 0 3px rgba(23,107,135,.16); }
.choice-button.is-wrong { border-color: var(--coral); background: var(--coral-soft); }
.choice-button.is-right { border-color: var(--leaf); background: #e8f7ef; }
.feedback { margin-top: 20px; padding: 16px 18px; border-left: 6px solid var(--sun); border-radius: 10px; background: #fff8df; line-height: 1.7; }
.build-board { margin-top: 20px; padding: 22px; border: 2px dashed var(--coral); border-radius: 20px; background: #fff9f7; }
.build-board strong { display: block; margin-bottom: 8px; color: var(--coral-dark); font-size: 18px; }
.check-list { display: grid; gap: 12px; margin: 22px 0; }
.check-button { display: flex; align-items: center; gap: 12px; min-height: 58px; padding: 12px 15px; border: 2px solid var(--line); border-radius: 15px; background: white; text-align: left; font-weight: 800; }
.check-button[aria-pressed="true"] { border-color: var(--leaf); background: #e8f7ef; }
.check-mark { display: grid; place-items: center; flex: 0 0 auto; width: 30px; height: 30px; border: 2px solid currentColor; border-radius: 9px; }
.tool-badge { display: inline-flex; align-items: center; gap: 8px; min-height: 38px; padding: 7px 12px; border-radius: 999px; background: var(--ink); color: white; font-size: 13px; font-weight: 900; }
.mission-actions { justify-content: space-between; padding: 22px clamp(24px, 5vw, 48px) 28px; border-top: 1px solid var(--line); }

.frame-toolbar { display: flex; align-items: center; gap: 24px; margin-bottom: 18px; }
.frame-toolbar .back-button { margin: 0; }
.frame-toolbar h1 { margin: 0; font-size: 28px; }
.intro-sync-note { margin: 0 0 14px; padding: 12px 16px; border-left: 5px solid var(--leaf); border-radius: 10px; background: #e8f7ef; color: var(--ink); line-height: 1.7; }
.intro-host { min-height: calc(100vh - 230px); overflow: hidden; border: 2px solid var(--ink); border-radius: 24px; background: white; box-shadow: var(--shadow); }
.intro-host .app-header, .intro-host .progress-strip { position: static; }
[data-intro-scope] .brand-mark { width: auto; height: auto; transform: none; }
[data-intro-scope] .dialog-close { position: static; inset: auto; }
[data-intro-scope] .back-button { margin: 0; }
[data-intro-scope] .speak-button { margin-left: 0; }

.parent-view { max-width: 1040px; margin: 0 auto; }
.parent-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.parent-heading h1 { margin: 0 0 8px; font-size: clamp(30px, 5vw, 52px); }
.parent-heading p:last-child { margin: 0; color: var(--muted); }
.mode-badge { padding: 8px 12px; border-radius: 999px; background: #fff2cc; color: #6f5100; font-size: 12px; font-weight: 900; }
.parent-login { max-width: 640px; padding: 30px; border: 2px solid var(--ink); border-radius: 24px; background: white; box-shadow: 7px 7px 0 var(--ink); }
.parent-login h2 { margin-top: 0; font-size: 28px; }
.parent-login p { color: var(--muted); line-height: 1.75; }
.parent-login button { margin: 8px 8px 0 0; }
.dashboard-actions { align-items: center; margin-bottom: 24px; }
.dashboard-actions #deleteFamilyButton { margin-left: auto; }
.danger-text { color: var(--danger); }
.retention-notice { margin: 18px 0; padding: 17px; border: 2px solid #dc9c20; border-radius: 16px; background: #fff5d7; }
.retention-notice p { margin: 6px 0 0; }
.learner-admin-grid { display: grid; gap: 18px; }
.admin-card { padding: 22px; border: 2px solid var(--line); border-radius: 22px; background: white; box-shadow: 0 6px 18px rgba(23,50,60,.08); }
.admin-card__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.admin-card__identity { display: flex; align-items: center; gap: 14px; }
.admin-card__identity span { font-size: 36px; }
.admin-card h2 { margin: 0; font-size: 22px; }
.admin-card p { margin: 5px 0 0; color: var(--muted); }
.admin-progress { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 18px 0; }
.progress-box { padding: 14px; border-radius: 15px; background: var(--ocean-soft); }
.progress-box:last-child { background: var(--coral-soft); }
.progress-box strong, .progress-box span { display: block; }
.progress-box strong { font: 900 24px/1 var(--font-display); }
.progress-box span { margin-top: 6px; color: var(--muted); font-size: 12px; }
.admin-card__actions { display: flex; flex-wrap: wrap; gap: 8px; }
.admin-card__actions button { min-height: 44px; border: 1px solid var(--line); border-radius: 12px; background: white; color: var(--ink); font-weight: 800; }
.admin-note { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--muted); font-size: .88rem; font-weight: 800; }
.admin-card:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }

dialog { width: min(520px, calc(100% - 28px)); padding: 0; border: 0; border-radius: 26px; background: transparent; }
dialog::backdrop { background: rgba(10,35,44,.65); backdrop-filter: blur(4px); }
.dialog-card { position: relative; margin: 0; padding: 30px; border: 2px solid var(--ink); border-radius: 24px; background: white; box-shadow: 9px 9px 0 var(--ink); }
.dialog-card h2 { margin: 0 0 8px; font-size: 30px; }
.dialog-card > p:not(.eyebrow):not(.field-error):not(.field-help):not(.pair-code) { color: var(--muted); line-height: 1.65; }
.dialog-close { position: absolute; top: 12px; right: 12px; border: 0; border-radius: 50%; background: #edf4f6; color: var(--ink); font-size: 24px; }
.dialog-card label, .dialog-card legend { display: block; margin: 17px 0 7px; font-weight: 900; }
.dialog-card input[type="text"], .dialog-card input:not([type]) { width: 100%; min-height: 50px; padding: 12px; border: 2px solid #98b2bb; border-radius: 12px; font-size: 16px; }
.code-input { width: 100%; min-height: 64px; padding: 8px 16px; border: 2px solid var(--ocean); border-radius: 14px; text-align: center; font: 900 32px/1 var(--font-display); letter-spacing: .22em; }
.field-help { margin: 7px 0; color: var(--muted); font-size: 12px; }
.field-error { min-height: 22px; margin: 8px 0; color: var(--danger); font-weight: 800; }
fieldset { margin: 16px 0; padding: 0; border: 0; }
.avatar-choices, .grade-choices { display: flex; flex-wrap: wrap; gap: 10px; }
.avatar-choices label, .grade-choices label { display: flex; align-items: center; justify-content: center; min-width: 54px; min-height: 50px; margin: 0; padding: 8px 12px; border: 2px solid var(--line); border-radius: 13px; cursor: pointer; }
.avatar-choices label:has(input:checked), .grade-choices label:has(input:checked) { border-color: var(--ocean); background: var(--ocean-soft); }
.avatar-choices input, .grade-choices input { margin-right: 7px; }
.pair-result { text-align: center; }
.pair-result canvas { width: min(220px, 70vw); height: auto; margin: 16px auto; border: 8px solid white; image-rendering: pixelated; }
.pair-code { margin: 10px 0; color: var(--ocean-dark); font: 900 36px/1 var(--font-display); letter-spacing: .18em; }
.toast { position: fixed; left: 50%; bottom: max(24px, env(safe-area-inset-bottom)); z-index: 100; max-width: min(520px, calc(100% - 28px)); padding: 14px 18px; border-radius: 14px; background: var(--ink); color: white; box-shadow: var(--shadow); transform: translateX(-50%); font-weight: 800; }
.noscript { margin: 20px; padding: 20px; background: #fff0f0; color: var(--danger); }

@media (max-width: 900px) {
  .welcome-view { grid-template-columns: 1fr; min-height: auto; }
  .route-preview { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: center; }
  .route-join { position: absolute; left: 50%; top: 50%; z-index: 2; height: auto; transform: translate(-50%, -50%) rotate(90deg); }
  .route-card { padding-left: 28px; padding-top: 106px; }
  .route-number { top: 24px; }
  .trail-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .mission-shell { grid-template-columns: 1fr; }
  .mission-map { position: static; overflow-x: auto; }
  #phaseRail { display: flex; min-width: 700px; }
  .phase-step { flex: 1; grid-template-columns: 35px 1fr; }
  .phase-step::after { left: auto; right: -5px; top: 25px; bottom: auto; width: 12px; height: 2px; }
}

@media (max-width: 640px) {
  .site-header { align-items: flex-start; padding-inline: 12px; }
  .brand-button strong { font-size: 14px; }
  .brand-button small { display: none; }
  .sync-pill { display: none; }
  main { width: min(100% - 22px, 1180px); padding-top: 26px; }
  .welcome-copy h1 { font-size: 37px; }
  .welcome-actions > button { width: 100%; }
  .route-preview { display: grid; grid-template-columns: 1fr; }
  .route-card { min-height: 185px; transform: none; }
  .route-join { position: static; transform: none; }
  .learner-banner, .section-heading, .parent-heading { align-items: flex-start; }
  .learner-avatar { width: 58px; height: 58px; font-size: 32px; }
  .trail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .course-section { padding: 18px 12px; }
  .course-section::before { display: none; }
  .trail-card { min-height: 148px; padding: 15px 12px; }
  .mission-header { align-items: flex-start; flex-wrap: wrap; }
  .speak-button { margin-left: 76px; }
  .mission-icon { width: 58px; height: 58px; font-size: 30px; }
  .choice-grid { grid-template-columns: 1fr; }
  .mission-actions > button { flex: 1; }
  .frame-toolbar { align-items: flex-start; flex-direction: column; gap: 10px; }
  .parent-heading { flex-direction: column; }
  .admin-progress { grid-template-columns: 1fr; }
  .dialog-card { padding: 27px 19px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}