:root {
  --ink: #18221c;
  --muted: #687069;
  --paper: #f3f1e9;
  --cream: #ebe8dd;
  --white: #fbfaf5;
  --line: #d5d3c8;
  --green: #163d2c;
  --lime: #d8f04a;
  --orange: #ef7455;
  --blue: #b9d5e7;
  /* Georgia and Manrope carry no CJK glyphs, so each stack names a Japanese face
     before the generic fallback — otherwise the browser picks one per platform and
     kanji render in a weight that fights the Latin text beside them. */
  --serif: Georgia, "Times New Roman", "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "Noto Serif CJK JP", serif;
  --sans: "Manrope", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Noto Sans CJK JP", sans-serif;
  --mono: "DM Mono", "Hiragino Sans", "Noto Sans JP", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); }
button, input, textarea { font: inherit; }
button, a { color: inherit; }
button { cursor: pointer; }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: 228px 1fr; }
.sidebar { position: fixed; inset: 0 auto 0 0; width: 228px; padding: 28px 20px 22px; border-right: 1px solid var(--line); background: #eceae1; display: flex; flex-direction: column; z-index: 20; }
.brand { display: flex; align-items: center; gap: 11px; font-size: 13px; font-weight: 700; line-height: 1.05; text-decoration: none; letter-spacing: -.03em; }
.brand-mark { width: 37px; height: 37px; display: grid; place-items: center; background: var(--green); color: var(--lime); border-radius: 50%; font: 500 11px var(--mono); letter-spacing: -.08em; }
.main-nav { margin-top: 70px; display: grid; gap: 5px; }
.nav-item { width: 100%; border: 0; background: transparent; display: flex; align-items: center; gap: 12px; padding: 12px 13px; color: #777d77; font-size: 13px; text-align: left; border-radius: 4px; }
.nav-item:hover { background: rgba(255,255,255,.5); color: var(--ink); }
.nav-item.active { background: var(--green); color: white; }
.nav-icon { font: 17px var(--mono); width: 18px; text-align: center; }
.sidebar-bottom { margin-top: auto; }
.streak-card { border: 1px solid #d1cec1; padding: 14px; margin-bottom: 20px; background: rgba(255,255,255,.22); }
.streak-top { display: flex; justify-content: space-between; align-items: center; font-size: 11px; font-weight: 700; }
.spark { color: #ee6d4b; font-size: 18px; }
.streak-days, .streak-dots { display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; }
.streak-days { margin-top: 14px; color: #81857f; font: 8px var(--mono); }
.streak-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); margin: 6px auto 0; }
.streak-dots i.today { outline: 2px solid var(--orange); outline-offset: 2px; }
.profile { border: 0; background: transparent; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; padding: 0; width: 100%; text-align: left; }
.avatar { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: #d5c7b2; font: 10px var(--mono); }
.profile b { display: block; font-size: 10px; }
.profile small { display: block; margin-top: 2px; color: var(--muted); font-size: 8px; }
.more { font-size: 10px; color: #888; }

main { grid-column: 2; min-width: 0; }
.topbar { height: 70px; padding: 0 5.5vw; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; }
.eyebrow, .kicker { font: 500 9px var(--mono); letter-spacing: .15em; }
.top-actions { display: flex; align-items: center; gap: 18px; }
.icon-button { position: relative; border: 0; background: transparent; font-size: 18px; }
.notification-dot { position: absolute; width: 5px; height: 5px; border-radius: 50%; background: var(--orange); right: 3px; top: 1px; }
.import-trigger { border: 0; background: transparent; font: 500 10px var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.mobile-menu { display: none; border: 0; background: transparent; }
.page { display: none; padding: 55px 5.5vw 80px; max-width: 1440px; margin: 0 auto; }
.page.active { display: block; animation: rise .35s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
.hero { display: flex; justify-content: space-between; align-items: center; gap: 50px; }
.kicker { color: var(--orange); margin: 0 0 16px; }
h1 { margin: 0; font: 400 clamp(42px, 5vw, 72px)/.97 var(--serif); letter-spacing: -.045em; }
h1 em { color: var(--green); font-weight: 400; }
.hero-copy { max-width: 530px; margin: 23px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.due-ring { width: 135px; height: 135px; position: relative; flex: none; }
.due-ring svg { width: 100%; transform: rotate(-90deg); }
.due-ring circle { fill: none; stroke-width: 3; }
.ring-track { stroke: #d8d5ca; }
.ring-progress { stroke: var(--orange); stroke-dasharray: 327; stroke-dashoffset: 92; stroke-linecap: round; }
.due-ring > div { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.due-ring strong { display: block; font: 400 36px var(--serif); }
.due-ring span { font: 8px var(--mono); text-transform: uppercase; color: var(--muted); }
.section-heading, .panel-title { display: flex; justify-content: space-between; align-items: center; }
.section-heading { margin-top: 68px; margin-bottom: 18px; }
.section-heading > div, .panel-title > div { display: flex; align-items: center; gap: 12px; }
.section-number { color: var(--orange); font: 9px var(--mono); }
h2 { margin: 0; font: 400 21px var(--serif); }
.freshness { display: flex; align-items: center; gap: 10px; color: var(--muted); font: 8px var(--mono); letter-spacing: .06em; }
.freshness i { display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: #45a76e; margin-right: 5px; }
/* Which deck today's course draws from — one deck per course, §20. */
.course-deck { display: flex; align-items: center; gap: 7px; text-transform: uppercase; }
.course-deck select { border: 1px solid var(--line); background: var(--paper); color: var(--ink);
  padding: 6px 8px; font: 9px var(--mono); max-width: 210px; }
.course-deck-count { color: var(--orange); }
.course-deck-name b { color: var(--ink); font-weight: 500; }
.course-deck-empty { color: var(--orange); }

.featured-lesson { display: grid; grid-template-columns: minmax(300px, .95fr) minmax(390px, 1.2fr); min-height: 385px; background: var(--white); border: 1px solid var(--line); }
.lesson-visual { position: relative; overflow: hidden; background: #c7dbe5; min-height: 330px; }
.visual-grid { position: absolute; inset: 0; opacity: .3; background-image: linear-gradient(#38574b 1px, transparent 1px), linear-gradient(90deg, #38574b 1px, transparent 1px); background-size: 52px 52px; transform: perspective(400px) rotateX(63deg) scale(1.7); transform-origin: bottom; }
.sun { position: absolute; width: 170px; height: 170px; background: var(--orange); border-radius: 50%; right: 15%; top: 16%; }
.city { position: absolute; left: -3%; right: -3%; bottom: 0; clip-path: polygon(0 70%,8% 70%,8% 40%,14% 40%,14% 60%,22% 60%,22% 25%,28% 25%,28% 54%,36% 54%,36% 10%,39% 10%,39% 54%,48% 54%,48% 35%,54% 35%,54% 62%,62% 62%,62% 45%,70% 45%,70% 22%,78% 22%,78% 58%,84% 58%,84% 37%,91% 37%,91% 67%,100% 67%,100% 100%,0 100%); }
.city-back { height: 72%; background: #789d96; opacity: .7; }
.city-front { height: 55%; background: var(--green); }
.visual-label { position: absolute; top: 30px; left: 30px; color: var(--green); font: 500 10px/1.3 var(--mono); letter-spacing: .2em; }
.edition { position: absolute; bottom: 25px; left: 28px; color: white; font: 8px var(--mono); letter-spacing: .13em; }
.lesson-content { padding: 43px 48px 38px; display: flex; flex-direction: column; }
.lesson-meta { display: flex; gap: 15px; align-items: center; color: #747a74; font: 8px var(--mono); letter-spacing: .08em; }
.topic-pill { background: var(--lime); color: var(--green); padding: 5px 8px; font: 500 8px var(--mono); letter-spacing: .1em; }
.lesson-content h3 { margin: 23px 0 13px; max-width: 580px; font: 400 clamp(27px, 3vw, 41px)/1.08 var(--serif); letter-spacing: -.025em; }
.lesson-content > p { margin: 0; max-width: 590px; color: var(--muted); font-size: 12px; line-height: 1.75; }
mark { background: linear-gradient(transparent 50%, rgba(216,240,74,.75) 50%); color: inherit; }
.word-preview { margin-top: 25px; }
.word-preview > span { display: block; margin-bottom: 9px; font: 8px var(--mono); text-transform: uppercase; color: var(--muted); }
.word-preview > div { display: flex; gap: 7px; flex-wrap: wrap; align-items: center; }
.word-chip { border: 1px solid #d9d5c9; background: transparent; padding: 7px 9px; font: 500 9px var(--mono); }
.word-chip small { color: #868a84; margin-left: 5px; }
.more-words { font: 9px var(--mono); color: var(--muted); margin-left: 4px; }
.primary-button { border: 0; background: var(--green); color: white; min-height: 45px; padding: 0 18px; display: inline-flex; justify-content: space-between; align-items: center; gap: 30px; font: 500 10px var(--mono); letter-spacing: .05em; }
.primary-button:hover { background: #21543e; }
.lesson-content .primary-button { margin-top: auto; align-self: flex-start; min-width: 205px; }

.content-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 38px; margin-top: 65px; }
.themes-panel { min-width: 0; }
.panel-intro { margin: 7px 0 20px 33px; color: var(--muted); font-size: 10px; }
.text-button { border: 0; background: transparent; font: 8px var(--mono); text-transform: uppercase; color: var(--muted); }
.theme-list { border-top: 1px solid var(--line); }
.theme-row { min-height: 78px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 12px; }
.theme-icon { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-size: 16px; }
.theme-row:nth-child(1) .theme-icon { background: #d5e5b9; }
.theme-row:nth-child(2) .theme-icon { background: #e8c3b2; }
.theme-row:nth-child(3) .theme-icon { background: #c2dce9; }
.theme-row h3 { margin: 0 0 5px; font: 400 15px var(--serif); }
.theme-row p { margin: 0; color: var(--muted); font-size: 9px; }
.theme-count { font: 8px var(--mono); color: var(--muted); }
.review-position { color: var(--muted); font: 8px var(--mono); }
.review-card { position: relative; min-height: 263px; margin-top: 18px; background: var(--green); color: white; padding: 24px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; cursor: pointer; transition: transform .3s; perspective: 800px; }
.review-card:hover { transform: translateY(-2px); }
.card-label { position: absolute; top: 20px; left: 20px; font: 8px var(--mono); color: #9db3a5; }
.sound-button { position: absolute; top: 13px; right: 13px; border: 1px solid #567164; background: transparent; color: white; width: 29px; height: 29px; border-radius: 50%; }
.review-word { font: 400 28px var(--serif); }
.review-prompt { margin-top: 10px; font-size: 9px; color: #9fb2a7; }
.review-answer { display: none; margin-top: 15px; animation: rise .3s ease; }
.review-card.revealed .review-prompt { display: none; }
.review-card.revealed .review-answer { display: block; }
.review-answer strong { color: var(--lime); font: 400 18px var(--serif); }
.review-answer p { font-size: 10px; line-height: 1.5; color: #cfdbd3; }
.tap-hint { position: absolute; bottom: 17px; font: 8px var(--mono); letter-spacing: .15em; color: #849c8e; }
.review-controls { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 15px; margin-top: 12px; }
.review-controls button { border: 0; background: transparent; }
.progress-track { height: 2px; background: var(--line); }
.progress-track span { display: block; height: 100%; width: 16.6%; background: var(--orange); transition: width .3s; }

.subpage-head { display: flex; justify-content: space-between; align-items: end; gap: 40px; margin-bottom: 45px; }
.subpage-head h1 { font-size: 58px; }
.subpage-head p:last-child { color: var(--muted); font-size: 13px; }
.card-toolbar { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.search { width: 330px; height: 42px; border-bottom: 1px solid var(--ink); display: flex; align-items: center; gap: 10px; }
.search input { border: 0; background: transparent; outline: 0; width: 100%; font-size: 11px; }
.filter-group { display: flex; align-items: center; gap: 5px; }
.filter { border: 1px solid var(--line); background: transparent; padding: 9px 12px; font: 9px var(--mono); }
.filter.active { background: var(--green); color: white; border-color: var(--green); }
.cards-table { border-top: 1px solid var(--ink); }
.card-row { display: grid; grid-template-columns: 1.2fr 1.5fr .7fr .6fr 30px; gap: 20px; align-items: center; padding: 18px 12px; border-bottom: 1px solid var(--line); font-size: 11px; }
.card-row.header { padding-block: 10px; color: var(--muted); font: 8px var(--mono); text-transform: uppercase; }
.card-row strong { font: 400 16px var(--serif); }
.status { justify-self: start; padding: 5px 7px; font: 8px var(--mono); background: #e5e3da; }
.status.due { background: #f5d5c8; color: #8b3c2a; }
.status.new { background: #d6e7bf; color: #355326; }
.deck-tag { color: var(--muted); font: 9px var(--mono); }
.deck-tag i { display: inline-block; margin-left: 5px; padding: 2px 4px; background: #e0ded3; color: #5c6159; font-style: normal; font-size: 7px; letter-spacing: .08em; }
/* Visible at rest, not revealed on hover: a control you cannot see is a feature nobody
   knows they have, and there is no hover at all on a touch screen. */
.row-delete { border: 1px solid transparent; background: transparent; width: 26px; height: 26px; border-radius: 50%; color: #9a9d96; font-size: 16px; line-height: 1; opacity: .4; transition: opacity .15s; }
.card-row:hover .row-delete, .row-delete:focus-visible { opacity: 1; }
.row-delete:hover { border-color: var(--orange); color: var(--orange); }
.card-row.confirming { grid-template-columns: 1.2fr 1fr auto; background: #f6ece7; }
.card-row.confirming > span:first-of-type { color: var(--muted); font-size: 10px; line-height: 1.55; }
.row-actions { display: flex; gap: 7px; justify-content: flex-end; }
.row-actions button { border: 1px solid var(--line); background: transparent; padding: 8px 11px; font: 9px var(--mono); }
.row-actions .row-confirm { background: var(--orange); border-color: var(--orange); color: white; }

.deck-bar { margin-bottom: 22px; }
.deck-bar.has-decks { border-bottom: 1px solid var(--line); padding-bottom: 18px; }
.deck-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.deck-chip { display: inline-flex; align-items: center; gap: 7px; border: 1px solid var(--line); background: transparent; padding: 9px 12px; font: 9px var(--mono); }
.deck-chip span { color: var(--muted); font-size: 8px; }
.deck-chip i { font-style: normal; font-size: 7px; letter-spacing: .08em; background: #e0ded3; color: #5c6159; padding: 2px 4px; }
.deck-chip.active { background: var(--green); border-color: var(--green); color: white; }
.deck-chip.active span, .deck-chip.active i { color: #cfdbd3; }
.deck-chip.active i { background: #2b5744; }
.deck-chip.paused { opacity: .55; }
.deck-chip.paused .paused-mark { background: transparent; border: 1px solid var(--line); color: var(--muted); }
.deck-manage { margin-left: auto; display: inline-flex; align-items: center; gap: 7px; border: 1px solid var(--line); background: transparent; padding: 9px 12px; font: 9px var(--mono); }
.deck-manage.open { border-color: var(--ink); }
.deck-manage span { color: var(--muted); }
.deck-select { margin-top: 14px; padding: 15px 17px; background: var(--white); border: 1px solid var(--line); }
.deck-select-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; flex-wrap: wrap; }
.deck-select-head b { font-size: 11px; }
.deck-select-head p { margin: 5px 0 0; color: var(--muted); font-size: 10px; line-height: 1.6; max-width: 520px; }
.deck-select-bulk { display: flex; gap: 6px; flex: none; }
.deck-select-bulk button { border: 1px solid var(--line); background: transparent; padding: 7px 11px; font: 9px var(--mono); }
.deck-select-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 2px 20px; margin-top: 13px; }
.deck-select-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--line); cursor: pointer; }
.deck-select-row input { width: 15px; height: 15px; accent-color: var(--green); flex: none; }
.deck-select-name { font-size: 11px; color: var(--muted); }
.deck-select-row.on .deck-select-name { color: var(--ink); }
.deck-select-meta { margin-left: auto; color: var(--muted); font: 8px var(--mono); letter-spacing: .06em; text-align: right; }
.deck-select-note { margin: 12px 0 0; color: var(--orange); font-size: 10px; }
.deck-detail { display: block; margin-top: 16px; padding: 16px 18px; background: var(--white); border: 1px solid var(--line); }
.deck-detail.compact { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; }
.deck-detail-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap; }
.deck-detail.danger { border-color: var(--orange); background: #f6ece7; }
.deck-detail b { font-size: 11px; }
.deck-detail p { margin: 6px 0 0; color: var(--muted); font-size: 10px; line-height: 1.6; max-width: 560px; }
.deck-explain { max-width: 520px; }
.deck-actions { display: flex; align-items: center; gap: 7px; flex: none; flex-wrap: wrap; justify-content: flex-end; }
.deck-actions button { border: 1px solid var(--line); background: transparent; padding: 9px 11px; font: 9px var(--mono); }
.deck-actions .deck-primary { background: var(--green); border-color: var(--green); color: white; }
.deck-actions button.on { border-color: var(--green); color: var(--green); }
.deck-actions .deck-danger:hover { border-color: var(--orange); color: var(--orange); }
.deck-detail.danger .deck-danger { background: var(--orange); border-color: var(--orange); color: white; }
.kind-switch { display: inline-flex; border: 1px solid var(--line); }
.kind-switch button { border: 0; background: transparent; padding: 9px 11px; font: 9px var(--mono); }
.kind-switch button.on { background: var(--green); color: white; }
.deck-rename label { display: block; color: var(--muted); font: 8px var(--mono); text-transform: uppercase; }
.deck-rename input { margin-top: 6px; width: min(320px, 60vw); border: 0; border-bottom: 1px solid var(--ink); background: transparent; outline: 0; padding: 6px 0; font-size: 13px; }
/* Choosing which decks to import, before anything is read (§20.2). */
.deck-picker { margin-top: 18px; border: 1px solid var(--line); background: var(--white); padding: 14px 16px; }
.deck-picker[hidden] { display: none; }
.deck-picker-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.deck-picker-head b { font-size: 11px; }
.deck-picker-head p { margin: 5px 0 0; color: var(--muted); font-size: 10px; line-height: 1.55; max-width: 420px; }
.deck-picker-bulk { display: flex; gap: 6px; flex: none; }
.deck-picker-bulk button { border: 1px solid var(--line); background: transparent; padding: 6px 10px; font: 8px var(--mono); }
.deck-picker-list { margin-top: 11px; max-height: 260px; overflow-y: auto; }
.deck-picker-row { display: grid; grid-template-columns: auto 1fr auto; gap: 4px 10px; align-items: center;
  padding: 8px 0; border-top: 1px solid var(--line); cursor: pointer; }
.deck-picker-row input { width: 15px; height: 15px; accent-color: var(--green); }
.deck-picker-name { font-size: 11px; color: var(--muted); }
.deck-picker-row.on .deck-picker-name { color: var(--ink); }
.deck-picker-meta { color: var(--muted); font: 8px var(--mono); text-align: right; }
.deck-picker-pair { grid-column: 2 / -1; color: var(--muted); font: 7.5px var(--mono);
  letter-spacing: .07em; text-transform: uppercase; }
.deck-picker-total { margin: 11px 0 0; padding-top: 10px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 10px; }
.deck-field { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.deck-field > span { color: var(--muted); font: 8px var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.deck-field input { flex: 1; border: 0; border-bottom: 1px solid var(--line); background: transparent; outline: 0; padding: 8px 0; font-size: 11px; }
.deck-field input:focus { border-color: var(--ink); }
.deck-hint { display: block; margin-top: 8px; color: var(--muted); font-size: 8px; line-height: 1.6; }
.library-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.library-card { border: 1px solid var(--line); background: var(--white); min-height: 360px; display: flex; flex-direction: column; }
.library-art { height: 170px; padding: 20px; position: relative; overflow: hidden; background: var(--art); }
.library-art::after { content:""; position:absolute; width:160px; height:160px; border:28px solid rgba(255,255,255,.5); border-radius:50%; right:-35px; bottom:-55px; }
.library-art span { position: relative; z-index: 1; font: 9px var(--mono); letter-spacing: .14em; }
.library-card-content { padding: 23px; flex: 1; display: flex; flex-direction: column; }
.library-card h3 { margin: 14px 0 10px; font: 400 22px/1.15 var(--serif); }
.library-card p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.5; }
.library-card footer { margin-top: auto; padding-top: 20px; display: flex; justify-content: space-between; font: 8px var(--mono); color: var(--muted); }

.modal { position: fixed; inset: 0; z-index: 100; display: none; place-items: center; padding: 20px; }
.modal.open { display: grid; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(17,28,22,.72); backdrop-filter: blur(3px); }
.modal-card { position: relative; z-index: 1; width: min(530px, 100%); max-height: 94vh; overflow-y: auto; background: var(--paper); padding: 42px; box-shadow: 0 24px 80px rgba(0,0,0,.25); }
.modal-card h2 { font-size: 35px; margin-bottom: 12px; }
.modal-card > p:not(.kicker) { color: var(--muted); font-size: 11px; line-height: 1.6; }
.modal-close { position: absolute; right: 18px; top: 14px; border: 0; background: transparent; font-size: 25px; font-weight: 300; }
.drop-zone { border: 1px dashed #a9aaa2; min-height: 145px; display: flex; flex-direction: column; align-items: center; justify-content: center; margin-top: 22px; }
.drop-zone.dragging { background: #e5eccd; border-color: var(--green); }
.upload-icon { width: 32px; height: 32px; border-radius: 50%; background: var(--green); color: white; display: grid; place-items: center; margin-bottom: 8px; }
.drop-zone strong { font-size: 11px; }
.drop-zone span { margin: 4px 0 10px; color: var(--muted); font-size: 8px; }
.file-button { text-decoration: underline; font: 8px var(--mono); cursor: pointer; }
.paste-divider { text-align: center; border-bottom: 1px solid var(--line); height: 10px; margin: 17px 0; }
.paste-divider span { background: var(--paper); padding: 0 8px; color: var(--muted); font: 8px var(--mono); }
textarea { display: block; width: 100%; height: 95px; resize: vertical; border: 1px solid var(--line); background: var(--white); padding: 12px; outline: 0; font: 10px/1.6 var(--mono); }
.full { width: 100%; margin-top: 14px; }
.privacy-note { display: block; text-align: center; margin-top: 10px; color: var(--muted); font-size: 8px; }
.toast { position: fixed; z-index: 200; right: 24px; bottom: 24px; background: var(--green); color: white; padding: 15px 20px; font-size: 10px; transform: translateY(100px); opacity: 0; transition: .35s; }
.toast.show { transform: translateY(0); opacity: 1; }

.lesson-overlay { position: fixed; inset: 0; z-index: 90; background: var(--paper); overflow-y: auto; display: none; }
.lesson-overlay.open { display: block; animation: rise .35s ease; }
.lesson-overlay > header { height: 72px; padding: 0 4vw; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; }
.lesson-steps { width: 300px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; position: relative; }
.lesson-steps span { height: 2px; background: var(--line); }
.lesson-steps span.active { background: var(--orange); }
.lesson-steps small { position: absolute; width: 100%; top: 9px; text-align: center; font: 7px var(--mono); color: var(--muted); }
.close-lesson { border: 0; background: transparent; font-size: 25px; }
.reader { width: min(680px, calc(100% - 40px)); margin: 65px auto 90px; }
.reader-meta { display: flex; align-items: center; gap: 12px; color: var(--muted); font: 8px var(--mono); }
.reader h1 { font-size: clamp(42px, 6vw, 65px); margin: 25px 0 18px; }
.dek { font: 400 19px/1.5 var(--serif); color: var(--muted); }
.audio-player { margin: 34px 0; padding: 15px; border: 1px solid var(--line); display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 15px; }
.audio-player button { width: 36px; height: 36px; border-radius: 50%; border: 0; background: var(--green); color: white; }
.audio-player strong { display: block; font-size: 9px; }
.audio-player time { font: 8px var(--mono); color: var(--muted); }
.audio-line { height: 2px; background: var(--line); margin-top: 7px; }
.audio-line span { display: block; height: 100%; width: 0; background: var(--orange); transition: width 4s linear; }
.audio-player.playing .audio-line span { width: 100%; }
.article-body p { font: 400 18px/1.85 var(--serif); }
.article-body mark { padding: 0 2px; cursor: help; }
.reader-next { margin-top: 25px; }

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 76px 1fr; }
  .sidebar { width: 76px; padding: 25px 12px; }
  .brand > span:last-child, .nav-item span:last-child, .streak-card, .profile > span:not(.avatar) { display: none; }
  .brand { justify-content: center; }
  .main-nav { margin-top: 55px; }
  .nav-item { justify-content: center; padding: 12px; }
  .profile { display: flex; justify-content: center; }
  main { grid-column: 2; }
  .featured-lesson { grid-template-columns: 1fr; }
  .lesson-visual { min-height: 270px; }
  .content-grid { grid-template-columns: 1fr; }
  .library-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .app-shell { display: block; }
  .sidebar { transform: translateX(-100%); width: 228px; transition: transform .3s; box-shadow: 10px 0 30px rgba(0,0,0,.1); }
  .sidebar.open { transform: translateX(0); }
  .sidebar .brand > span:last-child, .sidebar .nav-item span:last-child, .sidebar .streak-card, .sidebar .profile > span:not(.avatar) { display: block; }
  .sidebar .brand { justify-content: flex-start; }
  .sidebar .nav-item { justify-content: flex-start; }
  .sidebar .profile { display: grid; }
  main { display: block; }
  .topbar { padding: 0 20px; }
  .mobile-menu { display: block; }
  .eyebrow { display: none; }
  .page { padding: 38px 20px 60px; }
  .hero { align-items: flex-end; gap: 15px; }
  .hero h1 { font-size: 43px; }
  .hero-copy { font-size: 12px; }
  .due-ring { width: 90px; height: 90px; }
  .due-ring strong { font-size: 25px; }
  .section-heading { margin-top: 50px; }
  /* The deck picker is not decoration — it decides what the lesson will be — so it stays
     on a phone even though the freshness line it replaced did not. */
  .freshness { flex-wrap: wrap; margin-top: 10px; }
  .featured-lesson { display: block; }
  .lesson-visual { min-height: 220px; }
  .lesson-content { padding: 28px 23px; }
  .lesson-content h3 { font-size: 29px; }
  .lesson-content .primary-button { margin-top: 26px; }
  .content-grid { margin-top: 45px; }
  .subpage-head { display: block; }
  .subpage-head h1 { font-size: 48px; }
  .subpage-head .primary-button { margin-top: 15px; }
  .card-toolbar { display: block; }
  .search { width: 100%; margin-bottom: 20px; }
  .filter-group { overflow-x: auto; }
  .card-row { grid-template-columns: 1fr auto auto; gap: 10px; }
  .card-row > :nth-child(2) { grid-row: 2; grid-column: 1 / -1; }
  .card-row > :nth-child(3) { display: none; }
  .card-row.header { display: none; }
  /* No hover on a touch screen, so the delete control cannot hide behind one. */
  .row-delete { opacity: 1; }
  .card-row.confirming { grid-template-columns: 1fr; }
  .card-row.confirming > span:first-of-type { grid-column: 1; }
  .row-actions { justify-content: flex-start; }
  .deck-detail, .deck-detail.compact, .deck-detail-head { display: block; }
  .deck-actions { margin-top: 14px; justify-content: flex-start; }
  .deck-manage { margin-left: 0; }
  .deck-select-meta { margin-left: 0; text-align: left; }
  .library-grid { grid-template-columns: 1fr; }
  .modal-card { padding: 35px 22px 25px; }
  .lesson-steps { width: 130px; }
  .reader { margin-top: 45px; }
}