:root {
  --space-blue: #3d6fbe;
  --ice-highlight: #78aeff;
  --deep-space: #1f416f;
  --graphite: #25292d;
  --silver: #e8ebef;
  --white: #ffffff;
  --danger: #b43b49;
  --shadow: 0 24px 70px rgba(31, 65, 111, 0.14);
  --font-ja: "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --font-data: Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--silver); color: var(--graphite); font-family: var(--font-ja); }
body { min-height: 100vh; margin: 0; font-weight: 500; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .6; }
[hidden] { display: none !important; }

.ambient { position: fixed; inset: 0; pointer-events: none; overflow: hidden; }
.ambient span { position: absolute; width: 34rem; height: 34rem; border: 1px solid rgba(61,111,190,.13); border-radius: 50%; }
.ambient span:nth-child(1) { top: -20rem; right: -8rem; }
.ambient span:nth-child(2) { bottom: -27rem; left: -7rem; width: 46rem; height: 46rem; }
.ambient span:nth-child(3) { top: 42%; left: 56%; width: 8rem; height: 8rem; background: rgba(120,174,255,.08); border: 0; filter: blur(24px); }

.login-shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; gap: 2rem; padding: clamp(1.25rem, 4vw, 3.5rem); background: linear-gradient(145deg, var(--graphite) 0%, var(--deep-space) 72%, #285d9c 100%); color: var(--white); }
.brand-lockup { display: inline-flex; align-items: center; gap: .75rem; color: inherit; font: 800 .82rem/1 var(--font-data); letter-spacing: .18em; text-decoration: none; }
.brand-lockup img { border-radius: 12px; box-shadow: 0 8px 30px rgba(120,174,255,.18); }
.login-card { align-self: center; width: min(100%, 40rem); margin-inline: auto; }
.kicker { margin: 0 0 .9rem; color: var(--space-blue); font: 800 .73rem/1.3 var(--font-data); letter-spacing: .2em; }
.login-card .kicker, .live-shell .kicker { color: var(--ice-highlight); }
.login-card h1 { margin: 0; font-size: clamp(2.4rem, 7vw, 4.8rem); line-height: 1.08; letter-spacing: -.055em; font-weight: 900; }
.lead { margin: 1.4rem 0 2.2rem; color: var(--silver); font-size: 1.02rem; line-height: 1.85; }
form { display: grid; gap: .6rem; }
label { margin-top: .75rem; color: var(--silver); font: 700 .75rem/1 var(--font-data); letter-spacing: .08em; }
input { width: 100%; padding: .95rem 1rem; border: 1px solid rgba(232,235,239,.32); border-radius: 12px; background: rgba(255,255,255,.08); color: white; outline: 0; }
input:focus { border-color: var(--ice-highlight); box-shadow: 0 0 0 4px rgba(120,174,255,.18); }
.primary-button { min-height: 3.4rem; border: 0; border-radius: 999px; background: var(--space-blue); color: white; padding: .9rem 1.5rem; font-weight: 800; box-shadow: 0 12px 34px rgba(61,111,190,.32); transition: transform .2s ease, box-shadow .2s ease; }
.primary-button:hover { transform: translateY(-2px); box-shadow: 0 16px 38px rgba(61,111,190,.4); }
.primary-button:focus-visible, .text-button:focus-visible, .scenario-card:focus-visible, .secondary-button:focus-visible, .stop-button:focus-visible { outline: 4px solid var(--ice-highlight); outline-offset: 3px; }
form .primary-button { margin-top: 1rem; background: linear-gradient(135deg, var(--space-blue), var(--ice-highlight)); }
.form-error { min-height: 1.4rem; margin: .4rem 0 0; color: #ffd2d7; font-size: .88rem; }
.privacy-note { margin: 0; text-align: center; color: rgba(232,235,239,.7); font-size: .77rem; }

.app-shell { width: min(1180px, calc(100% - 2rem)); margin-inline: auto; padding-bottom: 4rem; }
.topbar { min-height: 5.5rem; display: flex; align-items: center; justify-content: space-between; }
.topbar .brand-lockup { color: var(--deep-space); }
.text-button { border: 0; background: transparent; color: var(--space-blue); font-weight: 700; padding: .75rem; }
.brand-button { border: 0; background: transparent; padding: 0; }
.main-nav { display: flex; align-items: center; gap: .25rem; padding: .28rem; border: 1px solid rgba(31,65,111,.12); border-radius: 999px; background: rgba(255,255,255,.7); }
.nav-button { border: 0; border-radius: 999px; background: transparent; color: #65717c; padding: .62rem 1rem; font-weight: 800; }
.nav-button.is-active { background: var(--deep-space); color: white; }
.nav-button span { display: inline-grid; place-items: center; min-width: 1.35rem; min-height: 1.35rem; margin-left: .2rem; border-radius: 50%; background: var(--ice-highlight); color: var(--deep-space); font: 800 .68rem/1 var(--font-data); }
.learning-spine { display: grid; grid-template-columns: auto 1fr auto 1fr auto 1fr auto; align-items: center; gap: .7rem; color: #7d858d; font: 800 .69rem/1 var(--font-data); letter-spacing: .08em; text-transform: uppercase; }
.learning-spine i { height: 2px; background: #ced4da; }
.learning-spine .is-current { color: var(--space-blue); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 6vw, 6rem); align-items: center; min-height: 29rem; padding: 3rem 0; }
.hero-copy h1 { margin: 0; color: var(--graphite); font-size: clamp(3rem, 7vw, 6.4rem); line-height: .98; letter-spacing: -.065em; font-weight: 900; }
.hero-copy h1 em { color: var(--space-blue); font-style: normal; }
.hero-copy > p:last-child { max-width: 38rem; margin: 1.6rem 0 0; font-size: 1.05rem; line-height: 1.8; }
.quota-card { display: grid; grid-template-columns: 10rem 1fr; gap: 1.3rem; align-items: center; background: var(--white); padding: clamp(1.25rem, 3vw, 2rem); border-radius: 28px; box-shadow: var(--shadow); }
.quota-gauge { position: relative; width: 10rem; height: 10rem; }
.quota-gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.quota-gauge circle { fill: none; stroke-width: 10; }
.gauge-track { stroke: var(--silver); }
.gauge-progress { stroke: var(--space-blue); stroke-linecap: round; stroke-dasharray: 358.14; stroke-dashoffset: 0; transition: stroke-dashoffset .8s ease; }
.quota-number { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.quota-number strong { color: var(--deep-space); font: 900 2.65rem/.9 var(--font-data); }
.quota-number span { margin-top: .4rem; color: var(--space-blue); font: 800 .63rem/1 var(--font-data); letter-spacing: .12em; text-transform: uppercase; }
.quota-label { margin: 0; color: var(--deep-space); font-weight: 800; }
.quota-detail { margin: .4rem 0; font: 700 .9rem/1.4 var(--font-data); }
.quota-rule { margin: 0; color: #565d63; font-size: .77rem; line-height: 1.6; }

.practice-section { margin-top: 2rem; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; border-bottom: 1px solid rgba(37,41,45,.15); padding-bottom: 1.2rem; }
.section-heading h2 { margin: 0; color: var(--deep-space); font-size: clamp(1.7rem, 4vw, 2.8rem); letter-spacing: -.04em; }
.section-heading > p { margin: 0 0 .25rem; color: #5d6369; }
.scenario-list { display: grid; grid-template-columns: 1fr; gap: 1rem; padding: 1rem 0; }
.scenario-card { position: relative; min-height: 12rem; border: 1px solid transparent; border-radius: 20px; background: rgba(255,255,255,.68); padding: 1.35rem; text-align: left; color: var(--graphite); transition: border .2s, background .2s, transform .2s; }
.scenario-card:hover { transform: translateY(-2px); background: white; }
.scenario-card[aria-pressed="true"] { border-color: var(--space-blue); background: white; box-shadow: 0 12px 34px rgba(31,65,111,.1); }
.scenario-card[aria-pressed="true"]::after { content: "✓"; position: absolute; top: 1rem; right: 1rem; display: grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: 50%; background: var(--space-blue); color: white; font-weight: 900; }
.card-eyebrow { color: var(--space-blue); font: 800 .68rem/1 var(--font-data); letter-spacing: .16em; }
.scenario-card strong { display: block; margin: 1.6rem 0 .55rem; color: var(--deep-space); font-size: 1.35rem; }
.scenario-card p { margin: 0; line-height: 1.65; font-size: .9rem; }
.scenario-card.is-single { min-height: auto; border-color: var(--space-blue); background: white; padding: 1.6rem 4rem 1.6rem 1.6rem; box-shadow: 0 12px 34px rgba(31,65,111,.1); }
.scenario-card.is-single::after { content: "1"; position: absolute; top: 50%; right: 1.5rem; display: grid; place-items: center; width: 2.2rem; height: 2.2rem; transform: translateY(-50%); border-radius: 50%; background: var(--space-blue); color: white; font: 900 .85rem/1 var(--font-data); }
.scenario-card.is-single strong { margin-top: .85rem; }
.start-rail { display: flex; align-items: center; justify-content: space-between; gap: 2rem; background: linear-gradient(135deg, var(--graphite), var(--deep-space)); color: white; border-radius: 22px; padding: 1.15rem 1.25rem 1.15rem 1.6rem; }
.start-rail > div { display: grid; grid-template-columns: auto auto; gap: .22rem 1rem; align-items: baseline; }
.rail-label { grid-row: 1 / 3; align-self: center; color: var(--ice-highlight); font: 800 .62rem/1 var(--font-data); letter-spacing: .16em; writing-mode: vertical-rl; }
.start-rail strong { font-size: 1.1rem; }
.start-rail div > span:last-child { color: var(--silver); font-size: .8rem; }
.start-button { min-width: 17rem; }
.centered { text-align: center; color: var(--danger); }
.method-strip { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 3rem; border-top: 1px solid rgba(37,41,45,.15); }
.method-strip div { padding: 1.5rem 1rem; border-right: 1px solid rgba(37,41,45,.15); }
.method-strip div:last-child { border-right: 0; }
.method-strip span { color: var(--space-blue); font: 700 .7rem/1 var(--font-data); }
.method-strip strong { display: block; margin: .65rem 0 .3rem; color: var(--deep-space); font: 800 1rem/1 var(--font-data); }
.method-strip p { margin: 0; color: #656b70; font-size: .78rem; }

.live-shell { min-height: 100vh; background: radial-gradient(circle at 50% 46%, #2c5e9c 0%, var(--deep-space) 38%, var(--graphite) 86%); color: white; padding: clamp(1.2rem, 4vw, 3rem); }
.live-topbar { display: flex; justify-content: space-between; align-items: center; }
.live-status { display: inline-flex; align-items: center; gap: .6rem; color: var(--silver); font: 800 .7rem/1 var(--font-data); letter-spacing: .16em; }
.live-status i { width: .65rem; height: .65rem; border-radius: 50%; background: var(--ice-highlight); box-shadow: 0 0 18px var(--ice-highlight); }
.timer { font: 800 1.2rem/1 var(--font-data); letter-spacing: .08em; }
.live-stage { max-width: 54rem; margin: 5vh auto 0; text-align: center; }
.live-stage h1 { margin: 0; font-size: clamp(2.6rem, 7vw, 5.5rem); line-height: 1; letter-spacing: -.055em; }
.live-goal { max-width: 39rem; min-height: 3rem; margin: 1rem auto 0; color: var(--silver); line-height: 1.7; }
.voice-orbit { position: relative; display: grid; place-items: center; width: min(56vw, 17rem); aspect-ratio: 1; margin: 1.5rem auto; border-radius: 50%; background: rgba(120,174,255,.08); box-shadow: inset 0 0 70px rgba(120,174,255,.12), 0 0 80px rgba(61,111,190,.18); }
.orbital { position: absolute; inset: 8%; border: 1px solid rgba(120,174,255,.38); border-radius: 50%; animation: breathe 3.2s ease-in-out infinite; }
.orbital-two { inset: 20%; animation-delay: -.8s; }
.wave-bars { display: flex; gap: .38rem; align-items: center; height: 4rem; }
.wave-bars i { width: .38rem; height: 28%; border-radius: 99px; background: var(--ice-highlight); box-shadow: 0 0 16px rgba(120,174,255,.8); animation: wave 1.2s ease-in-out infinite alternate; }
.wave-bars i:nth-child(2), .wave-bars i:nth-child(6) { animation-delay: -.25s; }
.wave-bars i:nth-child(3), .wave-bars i:nth-child(5) { animation-delay: -.5s; }
.wave-bars i:nth-child(4) { animation-delay: -.75s; }
.voice-orbit.is-idle .wave-bars i { animation-play-state: paused; height: 18%; }
.connection-status { margin: 0; color: var(--ice-highlight); font-size: .88rem; }
.repair-phrases { display: flex; justify-content: center; flex-wrap: wrap; gap: .6rem; margin: 1.2rem 0; }
.repair-phrases span { border: 1px solid rgba(232,235,239,.25); border-radius: 999px; padding: .55rem .8rem; color: var(--silver); font: 600 .78rem/1 var(--font-data); }
.secondary-button { border: 1px solid rgba(120,174,255,.5); border-radius: 999px; background: transparent; color: var(--ice-highlight); padding: .7rem 1rem; font-weight: 700; }
.transcript { max-width: 38rem; margin: 1rem auto 0; border-radius: 14px; background: rgba(255,255,255,.08); padding: 1rem; color: white; line-height: 1.6; }
.live-actions { display: flex; justify-content: center; margin-top: 1.5rem; }
.stop-button { display: inline-flex; align-items: center; gap: .7rem; border: 1px solid rgba(255,255,255,.26); border-radius: 999px; background: rgba(37,41,45,.42); color: white; padding: .9rem 1.35rem; font-weight: 700; }
.stop-button span { width: .75rem; height: .75rem; border-radius: 3px; background: #fff; }
.stop-button b { font: inherit; }
.stop-button:disabled { cursor: wait; opacity: .72; }
.ending-overlay { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 1.5rem; background: rgba(31,65,111,.9); backdrop-filter: blur(10px); }
.ending-overlay[hidden] { display: none; }
.ending-card { width: min(100%, 30rem); display: grid; justify-items: center; gap: .8rem; border: 1px solid rgba(255,255,255,.24); border-radius: 24px; background: rgba(37,41,45,.8); color: white; padding: 2.2rem; text-align: center; box-shadow: 0 24px 70px rgba(0,0,0,.28); }
.ending-card strong { font-size: clamp(1.2rem, 4vw, 1.7rem); }
.ending-card small { color: #dce9ff; }
.ending-spinner { width: 2.2rem; height: 2.2rem; border: 3px solid rgba(255,255,255,.25); border-top-color: var(--ice-highlight); border-radius: 50%; animation: ending-spin .8s linear infinite; }
.ending-overlay[aria-busy="false"] .ending-spinner { animation: none; border-color: var(--ice-highlight); }

.shelf-hero { padding: clamp(4rem, 9vw, 8rem) 0 2.5rem; }
.shelf-hero h1, .review-grid h1, .lesson-hero h1, .tutor-sheet h1 { margin: 0; color: var(--graphite); font-size: clamp(2.6rem, 7vw, 5.8rem); line-height: 1.02; letter-spacing: -.06em; }
.shelf-hero h1 em, .review-grid h1 em { color: var(--space-blue); font-style: normal; }
.shelf-hero > p:last-child { max-width: 43rem; margin: 1.5rem 0 0; line-height: 1.8; }
.lesson-shelf { display: grid; border-top: 5px solid var(--deep-space); box-shadow: 0 12px 0 rgba(31,65,111,.08); }
.lesson-spine-card { display: grid; grid-template-columns: 5rem 1fr 9rem 2rem; gap: 1.4rem; align-items: center; width: 100%; border: 0; border-bottom: 1px solid #cdd4da; background: rgba(255,255,255,.72); padding: 1.4rem 1.6rem; color: var(--graphite); text-align: left; transition: background .2s, transform .2s; }
.lesson-spine-card:hover { background: white; transform: translateX(.35rem); }
.book-number { color: var(--ice-highlight); font: 900 2.7rem/1 var(--font-data); -webkit-text-stroke: 1px var(--space-blue); }
.lesson-spine-card small { color: var(--space-blue); font: 800 .65rem/1 var(--font-data); letter-spacing: .12em; text-transform: uppercase; }
.lesson-spine-card h2 { margin: .45rem 0 .25rem; color: var(--deep-space); font-size: 1.25rem; }
.lesson-spine-card p { margin: 0; color: #5f6870; font-size: .84rem; }
.book-progress { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .6rem; }
.book-progress::before { content: ""; grid-column: 1; grid-row: 1; width: 100%; height: .35rem; border-radius: 99px; background: #dce1e6; }
.book-progress span { z-index: 1; grid-column: 1; grid-row: 1; height: .35rem; border-radius: 99px; background: var(--space-blue); }
.book-progress small { grid-column: 2; }
.empty-shelf { padding: 4rem; border-bottom: 1px solid #ccd4db; background: rgba(255,255,255,.75); text-align: center; }
.empty-shelf > span { color: var(--space-blue); font: 900 3rem/1 var(--font-data); }
.empty-shelf h2 { color: var(--deep-space); font-size: 1.8rem; }

.review-shell, .lesson-shell { min-height: 100vh; width: min(1120px, calc(100% - 2rem)); margin-inline: auto; padding-bottom: 4rem; }
.review-spine { margin-top: 1rem; }
.review-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: clamp(2rem, 7vw, 7rem); align-items: center; min-height: 70vh; }
.review-grid > div:first-child > p:not(.kicker) { max-width: 43rem; line-height: 1.8; }
.privacy-card { margin-top: 2rem; border-left: 5px solid var(--ice-highlight); background: white; padding: 1.2rem 1.35rem; box-shadow: 0 15px 45px rgba(31,65,111,.08); }
.privacy-card strong { color: var(--deep-space); }
.privacy-card p { margin: .4rem 0 0; color: #626a72; font-size: .83rem; line-height: 1.7; }
.learner-transcript-card { margin-top: 2rem; overflow: hidden; border: 1px solid rgba(61,111,190,.2); border-radius: 22px; background: white; box-shadow: 0 15px 45px rgba(31,65,111,.08); }
.learner-transcript-card header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; background: var(--deep-space); color: white; }
.learner-transcript-card header strong { font-size: .9rem; }
.learner-transcript-card header span { color: var(--ice-highlight); font: 800 .65rem/1 var(--font-data); letter-spacing: .12em; }
.learner-transcript-card ol { display: grid; gap: .8rem; max-height: 22rem; overflow-y: auto; margin: 0; padding: 1.25rem 1.25rem 1.25rem 3.2rem; }
.learner-transcript-card li { padding-left: .35rem; color: var(--deep-space); font: 700 .96rem/1.65 var(--font-data); }
.learner-transcript-card li::marker { color: var(--space-blue); font-weight: 900; }
.review-action-card { position: sticky; top: 2rem; border-radius: 32px; background: linear-gradient(145deg, var(--graphite), var(--deep-space)); padding: 2.4rem; color: white; box-shadow: var(--shadow); text-align: center; }
.review-count { display: block; color: var(--ice-highlight); font: 900 6rem/.9 var(--font-data); }
.review-action-card > p { margin: 1rem 0 2rem; font: 800 .77rem/1.7 var(--font-data); letter-spacing: .1em; text-transform: uppercase; }
.review-action-card small { color: var(--silver); font-weight: 500; letter-spacing: 0; text-transform: none; }
.review-action-card .primary-button { width: 100%; background: var(--ice-highlight); color: var(--deep-space); }
.review-action-card .form-error { color: var(--silver); }

.lesson-hero { padding: clamp(3.5rem, 8vw, 7rem) 0 2.5rem; }
.lesson-hero h1 { color: var(--deep-space); max-width: 52rem; }
.lesson-summary { max-width: 46rem; line-height: 1.8; }
.lesson-goal { display: grid; grid-template-columns: 8rem 1fr; gap: 1rem; margin-top: 2rem; border-top: 1px solid #c9d0d6; border-bottom: 1px solid #c9d0d6; padding: 1.2rem 0; }
.lesson-goal span, .action-dock span { color: var(--space-blue); font: 800 .66rem/1.4 var(--font-data); letter-spacing: .14em; }
.lesson-goal strong { color: var(--deep-space); }
.point-list { display: grid; gap: 1.5rem; }
.lesson-point { overflow: hidden; border-radius: 24px; background: white; box-shadow: 0 18px 55px rgba(31,65,111,.09); }
.lesson-point > header { display: flex; align-items: center; gap: 1.2rem; padding: 1.5rem 1.7rem; border-bottom: 1px solid var(--silver); }
.lesson-point > header > span { color: var(--ice-highlight); font: 900 2.4rem/1 var(--font-data); }
.lesson-point header small, .language-shift small, .pattern small, .chunk-practice > small, .tutor-details small { color: var(--space-blue); font: 800 .62rem/1 var(--font-data); letter-spacing: .13em; }
.lesson-point h2 { margin: .3rem 0 0; color: var(--deep-space); font-size: 1.3rem; }
.language-shift { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1.4rem; align-items: center; padding: 1.7rem; }
.language-shift > b { color: var(--ice-highlight); font-size: 1.8rem; }
.language-shift p { margin: .55rem 0 0; font: 800 1.15rem/1.5 var(--font-data); }
.before p { color: #69727b; text-decoration: line-through; text-decoration-color: rgba(180,59,73,.5); }
.after p { color: var(--deep-space); }
.listen-button, .complete-button { border: 1px solid var(--space-blue); border-radius: 999px; background: transparent; color: var(--space-blue); padding: .55rem .8rem; font-size: .75rem; font-weight: 800; }
.listen-button { margin-top: .8rem; }
.after .ai-voice-note { display: block; margin-top: .45rem; color: #69727d; font: 600 .66rem/1.4 var(--font-data); letter-spacing: 0; }
.explanation { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; padding: 1.5rem 1.7rem; background: #f4f6f8; line-height: 1.7; }
.explanation > p { margin: 0; }
.pattern { border-left: 4px solid var(--ice-highlight); padding-left: 1rem; }
.pattern strong { display: block; margin-top: .45rem; color: var(--deep-space); font-family: var(--font-data); }
.explanation ul { grid-column: 2; margin: 0; padding-left: 1.2rem; color: #50585f; font-family: var(--font-data); }
.chunk-practice { display: grid; grid-template-columns: 10rem 1fr auto; gap: 1.2rem; align-items: center; padding: 1.35rem 1.7rem; }
.chunk-practice div { display: flex; flex-wrap: wrap; gap: .45rem; }
.chunk-practice div span { border-radius: 7px; background: var(--deep-space); color: white; padding: .45rem .6rem; font: 700 .82rem/1 var(--font-data); }
.complete-button.is-done { border-color: var(--deep-space); background: var(--deep-space); color: white; }
.action-dock { display: flex; align-items: center; justify-content: space-between; gap: 2rem; margin-top: 2rem; border-radius: 24px; background: linear-gradient(135deg, var(--graphite), var(--deep-space)); color: white; padding: 1.5rem 1.7rem; }
.action-dock strong { display: block; margin-top: .3rem; }
.lesson-footer-actions { padding: 2rem 0; text-align: right; }
.danger-link { border: 0; background: transparent; color: var(--danger); text-decoration: underline; }
.mode-switch { display: flex; padding: .25rem; border-radius: 999px; background: #dbe0e5; }
.mode-switch button { border: 0; border-radius: 999px; background: transparent; color: #68717a; padding: .55rem 1rem; font-weight: 800; }
.mode-switch button.is-active { background: white; color: var(--deep-space); box-shadow: 0 4px 15px rgba(31,65,111,.12); }
.tutor-sheet { margin-top: 5rem; border-top: 8px solid var(--deep-space); background: white; padding: clamp(1.5rem, 5vw, 4rem); box-shadow: var(--shadow); }
.tutor-sheet h1 { color: var(--deep-space); max-width: 52rem; }
.tutor-sheet > p:not(.kicker) { max-width: 45rem; line-height: 1.7; }
.tutor-sheet ol { list-style: none; margin: 3rem 0; padding: 0; border-top: 1px solid #d3d9de; }
.tutor-sheet li { display: grid; grid-template-columns: 11rem 1fr; gap: 2rem; padding: 1.3rem 0; border-bottom: 1px solid #d3d9de; }
.tutor-sheet li span { color: var(--space-blue); font: 800 .67rem/1.4 var(--font-data); letter-spacing: .12em; }
.tutor-sheet li div { display: grid; gap: .55rem; }
.tutor-sheet li strong { color: var(--deep-space); line-height: 1.55; }
.tutor-sheet li p { margin: 0; color: #68717a; line-height: 1.55; }
.tutor-details { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.tutor-details > div { background: #f1f4f7; padding: 1.2rem; }
.tutor-details p { margin: .5rem 0 0; line-height: 1.6; }
.tutor-total { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 1.2rem; background: var(--deep-space); color: white; }
.tutor-total span { font: 800 .7rem/1 var(--font-data); letter-spacing: .14em; }

@keyframes breathe { 0%,100% { transform: scale(.96); opacity: .45; } 50% { transform: scale(1.04); opacity: .95; } }
@keyframes wave { from { height: 20%; } to { height: 95%; } }
@keyframes ending-spin { to { transform: rotate(360deg); } }

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; min-height: auto; gap: 2rem; }
  .scenario-list { grid-template-columns: 1fr; }
  .scenario-card { min-height: 9.5rem; }
  .start-rail { align-items: stretch; flex-direction: column; }
  .start-button { min-width: 0; width: 100%; }
  .method-strip { grid-template-columns: 1fr 1fr; }
  .method-strip div:nth-child(2) { border-right: 0; }
  .method-strip div:nth-child(-n+2) { border-bottom: 1px solid rgba(37,41,45,.15); }
  .review-grid { grid-template-columns: 1fr; padding: 4rem 0; }
  .lesson-spine-card { grid-template-columns: 3.5rem 1fr 2rem; }
  .book-progress { display: none; }
  .language-shift, .explanation { grid-template-columns: 1fr; }
  .language-shift > b { transform: rotate(90deg); }
  .explanation ul { grid-column: 1; }
  .chunk-practice { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .app-shell { width: min(100% - 1.2rem, 1180px); }
  .topbar { min-height: 4.8rem; }
  .topbar .brand-lockup span { max-width: 9rem; line-height: 1.3; }
  .hero-grid { padding-top: 2rem; }
  .hero-copy h1 { font-size: clamp(3rem, 15vw, 4.7rem); }
  .quota-card { grid-template-columns: 7.5rem 1fr; gap: 1rem; }
  .quota-gauge { width: 7.5rem; height: 7.5rem; }
  .quota-number strong { font-size: 2rem; }
  .section-heading { align-items: start; flex-direction: column; gap: .5rem; }
  .start-rail > div { grid-template-columns: auto 1fr; }
  .method-strip { margin-bottom: 2rem; }
  .live-stage { margin-top: 6vh; }
  .repair-phrases span { font-size: .72rem; }
  .main-nav { order: 3; width: 100%; justify-content: center; }
  .topbar { flex-wrap: wrap; padding-bottom: .8rem; }
  .learning-spine { gap: .3rem; font-size: .55rem; letter-spacing: 0; }
  .lesson-spine-card { grid-template-columns: 2.5rem 1fr 1rem; gap: .75rem; padding: 1.1rem .8rem; }
  .book-number { font-size: 1.8rem; }
  .lesson-spine-card p { display: none; }
  .review-shell, .lesson-shell { width: min(100% - 1.2rem, 1120px); }
  .review-action-card { padding: 1.7rem 1.2rem; }
  .language-shift, .explanation, .lesson-point > header, .chunk-practice { padding-inline: 1.1rem; }
  .lesson-goal { grid-template-columns: 1fr; }
  .action-dock { align-items: stretch; flex-direction: column; }
  .tutor-sheet li { grid-template-columns: 1fr; gap: .5rem; }
  .tutor-details { grid-template-columns: 1fr; }
}

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