:root {
  color-scheme: light;
  --ink: #15292a;
  --muted: #627171;
  --paper: #f8f7f2;
  --white: #fffefa;
  --teal: #13645f;
  --teal-dark: #10292b;
  --mint: #b8e2d3;
  --lime: #d8ed86;
  --coral: #ee8268;
  --line: #dce3dd;
  --shadow: 0 18px 48px rgba(18, 44, 41, .08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.6; }
a { color: var(--teal); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }
.content-wrap { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: absolute; top: -50px; left: 14px; padding: 10px 14px; color: white; background: var(--teal-dark); z-index: 10; }
.skip-link:focus { top: 10px; }

.site-header { height: 78px; padding: 0 max(24px, calc((100vw - 1280px) / 2)); display: flex; justify-content: space-between; align-items: center; gap: 28px; background: var(--paper); border-bottom: 1px solid rgba(21, 41, 42, .08); }
.brand { color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 11px; font: 800 14px/1.15 Manrope, sans-serif; letter-spacing: -.02em; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font: 500 10px "DM Mono", monospace; letter-spacing: .08em; text-transform: uppercase; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; color: var(--teal-dark); background: var(--lime); border-radius: 50% 50% 50% 12px; font: 800 13px Manrope, sans-serif; }
.top-nav { display: flex; gap: clamp(12px, 2vw, 28px); align-items: center; }
.top-nav a { color: #536465; text-decoration: none; font-size: 12px; font-weight: 600; white-space: nowrap; }
.top-nav a:hover, .text-link:hover, .download-link:hover { color: #0a3938; text-decoration: underline; text-underline-offset: 4px; }

.hero { min-height: 526px; display: grid; grid-template-columns: 1.03fr .97fr; overflow: hidden; background: var(--teal-dark); color: white; padding: 66px max(36px, calc((100vw - 1160px) / 2)); position: relative; }
.hero-copy { position: relative; z-index: 2; align-self: center; max-width: 560px; }
.eyebrow { color: var(--teal); margin: 0 0 12px; font: 500 10px "DM Mono", monospace; letter-spacing: .17em; text-transform: uppercase; }
.hero .eyebrow { color: var(--lime); }
h1, h2, h3, h4, p { margin-top: 0; }
h1, h2, h3 { font-family: Manrope, "DM Sans", sans-serif; letter-spacing: -.045em; }
h1 { margin: 0; font-size: clamp(48px, 6.5vw, 78px); font-weight: 700; line-height: .99; }
.hero-lede { color: #d6e1dc; max-width: 485px; margin: 24px 0 29px; font-size: 16px; line-height: 1.65; }
.hero-actions { display: flex; align-items: center; gap: 23px; flex-wrap: wrap; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 10px; border: 0; border-radius: 100px; padding: 12px 19px; font-size: 12px; font-weight: 700; text-decoration: none; cursor: pointer; transition: transform .18s ease, background .18s ease, color .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-light { background: var(--lime); color: var(--teal-dark); }
.button-light:hover { background: white; }
.button-primary { background: var(--teal); color: white; }
.button-primary:hover { background: #0b4e4a; }
.button-outline { color: var(--ink); background: transparent; border: 1px solid var(--line); }
.button-outline:hover { background: white; }
.button-quiet { color: #d7e2dd; background: rgba(255,255,255,.08); padding: 9px 13px; }
.button-quiet:hover { color: white; background: rgba(255,255,255,.16); }
.text-link { color: #e1e9e5; font-size: 12px; text-decoration: none; }
.hero-meta { display: flex; gap: 24px; margin-top: 45px; color: #9fb4ad; font: 10px "DM Mono", monospace; letter-spacing: .06em; text-transform: uppercase; }
.hero-meta span::before { content: ""; display: inline-block; width: 6px; height: 6px; margin: 0 8px 1px 0; background: var(--coral); border-radius: 50%; }
.hero-visual { min-height: 390px; align-self: stretch; position: relative; }
.hero-glass { position: absolute; top: 53px; left: 15%; width: min(390px, 88%); height: 285px; border: 1px solid rgba(202, 238, 219, .52); border-radius: 48% 48% 45% 45%; overflow: hidden; background: linear-gradient(147deg, rgba(43, 113, 106, .66), rgba(19, 75, 75, .17)); box-shadow: 0 0 70px rgba(101, 211, 178, .12), inset 0 0 50px rgba(255, 255, 255, .06); transform: rotate(-5deg); }
.glass-label { position: absolute; top: 24px; left: 50%; transform: translateX(-50%); color: #d4e6dc; font: 9px "DM Mono", monospace; letter-spacing: .2em; }
.glass-sun { position: absolute; width: 53px; height: 53px; border-radius: 50%; top: 67px; right: 77px; background: var(--lime); box-shadow: 0 0 46px rgba(216, 237, 134, .45); }
.glass-hill { position: absolute; left: -10%; width: 125%; border-radius: 50% 50% 0 0; }
.hill-back { height: 140px; bottom: 31px; background: #2c7771; transform: rotate(-10deg); }
.hill-front { height: 121px; bottom: -10px; background: #1b4f50; transform: rotate(7deg); }
.glass-window { position: absolute; z-index: 1; left: 31%; top: 126px; padding: 9px 12px; border: 1px solid rgba(219, 245, 230, .68); border-radius: 8px; color: #e9f3ec; background: rgba(11, 47, 49, .46); font: 9px "DM Mono", monospace; letter-spacing: .08em; }
.orbit { position: absolute; border: 1px solid rgba(184, 226, 211, .2); border-radius: 50%; transform: rotate(-28deg); }
.orbit-one { width: 470px; height: 255px; top: 30px; left: 1%; }
.orbit-two { width: 420px; height: 335px; top: 42px; left: 9%; transform: rotate(38deg); }
.visual-tag { position: absolute; padding: 6px 10px; border-radius: 50px; font: 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .05em; }
.tag-world { top: 67px; right: 9%; color: var(--teal-dark); background: var(--mint); }
.tag-screen { bottom: 77px; left: 2%; color: var(--teal-dark); background: var(--coral); }
.visual-note { position: absolute; right: 1%; bottom: 24px; color: #b8ccc4; font-size: 11px; line-height: 1.45; }

.quick-map { padding-top: 83px; padding-bottom: 40px; }
.section-heading { max-width: 720px; margin-bottom: 30px; }
.section-heading h2 { margin: 0 0 12px; font-size: clamp(31px, 4.4vw, 48px); line-height: 1.1; }
.section-heading > p:not(.eyebrow) { max-width: 640px; color: var(--muted); font-size: 14px; line-height: 1.75; }
.compact-heading h2 { max-width: 680px; }
.spectrum { padding: 28px 32px 22px; border: 1px solid var(--line); border-radius: 15px; background: var(--white); }
.spectrum-line { position: relative; height: 5px; margin: 6px 12% 19px; background: linear-gradient(90deg, #89c4ae 0%, #5fa39a 45%, #416c8a 100%); border-radius: 8px; }
.spectrum-line span { position: absolute; top: 50%; width: 15px; height: 15px; background: var(--white); border: 4px solid var(--teal); border-radius: 50%; transform: translate(-50%, -50%); }
.spectrum-line span:nth-child(1) { left: 0; border-color: #80bb9d; }
.spectrum-line span:nth-child(2) { left: 33.3%; border-color: #409a8b; }
.spectrum-line span:nth-child(3) { left: 66.6%; border-color: #39788b; }
.spectrum-line span:nth-child(4) { left: 100%; border-color: #486381; }
.spectrum-items { display: grid; grid-template-columns: repeat(4, 1fr); text-align: center; gap: 10px; }
.spectrum-items b { display: block; font: 700 15px Manrope, sans-serif; }
.spectrum-items small { color: var(--muted); font-size: 11px; }

.section-block { padding-top: 84px; padding-bottom: 84px; scroll-margin-top: 30px; }
.lesson-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.lesson-card { position: relative; min-height: 240px; padding: 24px 23px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.lesson-number { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; color: var(--teal); background: #e8f2e9; font: 10px "DM Mono", monospace; }
.lesson-card h3, .soft-card h3, .reading-columns h3, .reward-panel h3 { margin: 17px 0 10px; font-size: 20px; line-height: 1.25; }
.lesson-card p, .soft-card p { color: var(--muted); font-size: 12px; line-height: 1.75; }
.lesson-card p:last-child { margin-bottom: 0; }
.mini-anchor { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; margin-top: 18px; }
.mini-anchor span { display: grid; justify-items: center; gap: 4px; color: var(--muted); font: 9px "DM Mono", monospace; }
.mini-anchor i { display: grid; place-items: center; width: 31px; height: 31px; border-radius: 9px; color: var(--teal); background: #e5f1e9; font: normal 16px serif; }
.space-diagram { height: 122px; display: flex; align-items: end; justify-content: space-around; gap: 12px; margin-top: 13px; padding: 12px; background: #e8f1ed; border-radius: 10px; }
.space-room { position: relative; height: 88px; width: 56%; border: 1px solid #83b9a5; border-radius: 7px; background: linear-gradient(180deg, #d5e9de, #ecf3e9); }
.space-object { position: absolute; top: 22px; left: 38%; padding: 6px 7px; color: white; background: var(--teal); border-radius: 5px; font-size: 9px; }
.space-label, .space-device small { position: absolute; bottom: 5px; left: 8px; color: #55756b; font: 8px "DM Mono", monospace; }
.space-device { position: relative; width: 35%; height: 78px; display: grid; place-items: center; padding: 8px 4px 20px; border: 3px solid #233b3c; border-radius: 10px; color: var(--teal); background: #fffefa; font-size: 8px; text-align: center; }
.space-device small { left: 3px; font-size: 6px; }
.occlusion-visual { position: relative; height: 100px; overflow: hidden; margin-top: 15px; border-radius: 9px; background: linear-gradient(135deg, #d3e6dd 0 50%, #b9d6ca 50%); }
.occlusion-back { position: absolute; top: 26px; left: 23%; width: 110px; height: 52px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--coral); font: 9px "DM Mono", monospace; }
.occlusion-wall { position: absolute; top: 9px; left: 47%; width: 31px; height: 86px; display: grid; place-items: center; color: #f6f4ee; background: #275b55; writing-mode: vertical-rl; font: 8px "DM Mono", monospace; }
.flow-diagram { display: flex; align-items: center; justify-content: space-between; gap: 5px; margin-top: 20px; }
.flow-diagram > span { padding: 9px 7px; border-radius: 8px; color: #173f3e; background: #e6f0e9; font-size: 10px; font-weight: 700; text-align: center; }
.flow-diagram small { display: block; margin-top: 3px; color: var(--muted); font-size: 7px; font-weight: 400; }
.flow-diagram > b { color: var(--coral); font-size: 14px; }

.deep-panel { display: grid; grid-template-columns: .75fr 1.25fr; gap: 40px; align-items: center; margin-top: 18px; padding: 32px; border-radius: 16px; background: #e7f0e9; }
.deep-panel h3 { margin: 0 0 10px; font-size: 28px; line-height: 1.2; }
.deep-panel p:not(.eyebrow) { color: #526c64; font-size: 12px; line-height: 1.7; }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.feature-list div { padding: 14px; background: rgba(255,255,255,.67); border-radius: 9px; }
.feature-list b, .feature-list span { display: block; }
.feature-list b { margin-bottom: 4px; color: var(--teal); font: 700 11px Manrope, sans-serif; }
.feature-list span { color: var(--muted); font-size: 10px; line-height: 1.5; }
.two-up { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
.soft-card { padding: 27px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.soft-card h3 { margin-top: 0; }
.number-list { padding-left: 19px; color: var(--muted); font-size: 12px; line-height: 1.85; }
.number-list li::marker { color: var(--teal); font-weight: 700; }
.small-note { color: #788580 !important; font-size: 10px !important; }
.device-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.device-compare > div { padding: 14px; border-radius: 10px; background: #edf3ef; }
.device-glyph { display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 11px; color: var(--teal); background: var(--mint); border-radius: 12px; font-size: 24px; }
.passthrough-glyph { color: #e4eafa; background: #385d78; }
.device-compare b { font: 700 12px Manrope, sans-serif; }
.device-compare p { margin: 7px 0 0; font-size: 10px !important; }

.reading-columns { display: grid; grid-template-columns: .85fr 1.15fr; gap: 28px; margin-top: 50px; padding: 30px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.reading-columns h3 { margin-top: 0; }
.definition-list { display: grid; gap: 8px; padding: 0; list-style: none; }
.definition-list li { display: grid; grid-template-columns: 98px 1fr; gap: 9px; font-size: 11px; }
.definition-list b { color: var(--teal); }
.definition-list span { color: var(--muted); }
.stage-flow { display: flex; align-items: center; flex-wrap: wrap; gap: 5px; margin: 18px 0; }
.stage-flow span { padding: 8px 10px; border-radius: 30px; color: var(--teal-dark); background: #e7f0e9; font-size: 9px; font-weight: 700; }
.stage-flow .doing-stage { background: var(--lime); }
.stage-flow i { color: #80938a; font-style: normal; font-size: 10px; }
.loop-callout { display: flex; flex-direction: column; gap: 3px; padding: 12px 14px; border-left: 3px solid var(--coral); background: #fff3ed; font-size: 11px; }
.loop-callout span { color: var(--muted); }
.reward-panel { display: grid; grid-template-columns: .7fr 1.3fr; gap: 32px; align-items: center; margin-top: 35px; padding: 27px 30px; border-radius: 15px; color: white; background: var(--teal-dark); }
.reward-panel .eyebrow { color: var(--lime); }
.reward-panel h3 { margin: 0; font-size: 21px; }
.reward-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.reward-grid div { padding: 12px; border: 1px solid rgba(255,255,255,.15); border-radius: 9px; background: rgba(255,255,255,.06); }
.reward-grid b, .reward-grid span { display: block; }
.reward-grid b { color: var(--lime); font: 700 11px Manrope, sans-serif; }
.reward-grid span { color: #c3d1cb; font-size: 10px; }
.reading-accordion { margin-top: 30px; border: 1px solid var(--line); border-radius: 13px; background: white; overflow: hidden; }
.reading-accordion summary { padding: 17px 20px; color: var(--teal-dark); cursor: pointer; font: 700 13px Manrope, sans-serif; }
.reading-accordion summary::marker { color: var(--teal); }
.accordion-content { padding: 0 20px 22px; }
.timeline-accordion { margin: 13px 0 16px; }
.timeline-intro { color: var(--muted); font-size: 10px; line-height: 1.7; }
.timeline-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 12px 0; }
.timeline-grid div { padding: 12px; border-radius: 8px; background: #f1f5ed; }
.timeline-grid b, .timeline-grid span { display: block; }
.timeline-grid b { margin-bottom: 5px; color: var(--teal); font: 700 10px "DM Mono", monospace; }
.timeline-grid span { color: var(--muted); font-size: 9px; line-height: 1.6; }
.takeaway-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.takeaway-grid article { padding: 13px; background: #f4f6f1; border-radius: 9px; }
.takeaway-grid h4 { margin-bottom: 6px; color: var(--teal); font: 700 11px Manrope, sans-serif; }
.takeaway-grid p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.source-footnote { margin: 22px 0 0; color: #84918a; font-size: 10px; }
.source-footnote a { color: var(--teal); font-weight: 700; }
.reading-note { display: flex; align-items: center; gap: 12px; margin: 0 0 24px; padding: 14px 17px; border-radius: 10px; background: #e8f2e9; }
.reading-note p { margin: 0; color: #526c64; font-size: 11px; }
.reading-note a { font-weight: 700; }
.note-icon { display: grid; place-items: center; flex: 0 0 28px; height: 28px; border-radius: 50%; color: white; background: var(--teal); font-size: 13px; }
.examples-panel { display: grid; grid-template-columns: .65fr 1.35fr; gap: 28px; align-items: center; margin: 16px 0; padding: 27px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.examples-heading h3, .market-panel h3 { margin: 0 0 8px; font: 700 20px/1.25 Manrope, sans-serif; letter-spacing: -.035em; }
.examples-heading p:not(.eyebrow) { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.example-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 7px; }
.example-grid div { min-height: 74px; padding: 11px; border-radius: 8px; background: #edf4ef; }
.example-grid b, .example-grid span { display: block; }
.example-grid b { margin-bottom: 4px; color: var(--teal); font: 700 10px Manrope, sans-serif; }
.example-grid span { color: var(--muted); font-size: 9px; line-height: 1.5; }
.rule-callout { grid-column: 1 / -1; margin-top: -14px; padding: 10px 12px; border-radius: 8px; color: #45635a; background: #eff6df; font-size: 10px; }
.rule-callout b { color: var(--teal); }
.market-panel { display: grid; grid-template-columns: .55fr 1.45fr; gap: 25px; align-items: center; margin: 31px 0 0; padding: 22px 25px; border: 1px solid var(--line); border-radius: 13px; background: #f1f5ed; }
.market-panel .eyebrow { margin-bottom: 5px; }
.market-panel h3 { margin: 0; font-size: 17px; }
.market-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.market-tags span { padding: 7px 10px; border: 1px solid #d5e3d6; border-radius: 30px; color: #31584f; background: white; font-size: 9px; }
.avatar-types { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 17px; }
.avatar-types div { padding: 14px; border-radius: 10px; background: #edf4ef; }
.avatar-types span { display: grid; place-items: center; width: 31px; height: 31px; margin-bottom: 9px; border-radius: 50%; color: var(--teal-dark); background: var(--lime); font-size: 15px; }
.avatar-types div:nth-child(2) span { color: white; background: var(--teal); }
.avatar-types b { display: block; font: 700 11px Manrope, sans-serif; }
.avatar-types p { margin: 5px 0 0; color: var(--muted); font-size: 10px; line-height: 1.65; }

.section-tint { background: #eef1e9; }
.cram-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.cram-grid details { border: 1px solid #d9e0d8; border-radius: 10px; background: var(--white); }
.cram-grid summary { padding: 14px 16px; color: var(--teal-dark); cursor: pointer; font: 700 12px Manrope, sans-serif; }
.cram-grid summary::marker { color: var(--teal); }
.cram-grid details p { margin: 0; padding: 0 16px 15px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.download-link { display: inline-block; margin-top: 18px; font-size: 11px; font-weight: 700; text-decoration: none; }

.vocab-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.vocab-card { padding: 25px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.vocab-card h3 { margin: 0 0 18px; font-size: 20px; }
.term-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; margin: 0; }
.term-list div { padding: 10px 0; border-top: 1px solid #ebefea; }
.term-list dt { margin-bottom: 3px; color: var(--teal); font: 700 10px "DM Mono", monospace; }
.term-list dd { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.55; }
.vocab-terms .term-list { grid-template-columns: 1fr 1fr; }

.section-dark { background: #10292b; color: white; }
.light-heading .eyebrow { color: var(--lime); }
.light-heading h2 { color: white; }
.light-heading > p:not(.eyebrow) { color: #b3c5be; }
.flashcard-layout { display: grid; grid-template-columns: 1.4fr .6fr; align-items: center; gap: 55px; }
.flashcard-wrap { max-width: 680px; }
.card-topline { display: flex; justify-content: space-between; margin: 0 5px 11px; color: #a8bcb4; font: 9px "DM Mono", monospace; letter-spacing: .12em; text-transform: uppercase; }
.flashcard { width: 100%; min-height: 300px; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 37px; border: 1px solid rgba(255,255,255,.2); border-radius: 18px; text-align: center; color: var(--ink); background: var(--lime); cursor: pointer; transition: background .2s ease, transform .2s ease; }
.flashcard:hover { transform: translateY(-2px); }
.flashcard.is-answer { background: #d2eee1; }
.card-label { margin-bottom: 17px; color: #46726a; font: 10px "DM Mono", monospace; letter-spacing: .15em; }
.card-text { max-width: 540px; font: 700 clamp(20px, 3vw, 30px)/1.35 Manrope, sans-serif; letter-spacing: -.03em; }
.card-hint { margin-top: 23px; color: #5c756b; font-size: 10px; }
.card-progress { height: 3px; margin: 17px 4px; overflow: hidden; background: rgba(255,255,255,.14); border-radius: 3px; }
.card-progress span { display: block; width: 3%; height: 100%; background: var(--coral); transition: width .25s ease; }
.card-controls { display: flex; justify-content: space-between; gap: 9px; }
.flashcard-aside { max-width: 230px; }
.aside-mark { display: grid; place-items: center; width: 40px; height: 40px; margin-bottom: 17px; color: var(--teal-dark); background: var(--coral); border-radius: 50%; font-size: 21px; }
.flashcard-aside h3 { margin-bottom: 9px; font-size: 22px; }
.flashcard-aside p { color: #b3c5be; font-size: 11px; line-height: 1.8; }
.mini-stat { display: flex; align-items: center; gap: 9px; margin-top: 20px; }
.mini-stat b { color: var(--lime); font: 700 25px Manrope, sans-serif; }
.mini-stat span { color: #b3c5be; font-size: 10px; }

.quiz-banner { display: flex; align-items: center; gap: 15px; margin-bottom: 18px; padding: 18px; border-radius: 12px; background: #e8f2e9; }
.quiz-icon { display: grid; place-items: center; flex: 0 0 44px; height: 44px; color: var(--teal-dark); background: var(--lime); border-radius: 14px; font: 800 16px Manrope, sans-serif; }
.quiz-banner b { font: 700 12px Manrope, sans-serif; }
.quiz-banner p { margin: 3px 0 0; color: var(--muted); font-size: 10px; }
.quiz-questions { display: grid; gap: 10px; }
.question-card { padding: 20px 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); }
.mc-card { min-width: 0; margin: 0; }
.mc-card legend { padding: 0; }
.question-head { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; color: var(--muted); font: 9px "DM Mono", monospace; letter-spacing: .08em; text-transform: uppercase; }
.question-head .q-number { display: grid; place-items: center; width: 25px; height: 25px; color: white; background: var(--teal); border-radius: 50%; font-size: 9px; }
.question-card h3 { margin: 0 0 13px; font: 600 14px/1.5 Manrope, sans-serif; letter-spacing: -.015em; }
.options { display: grid; gap: 7px; }
.option { display: flex; align-items: flex-start; gap: 10px; padding: 9px 11px; border: 1px solid #e4e9e4; border-radius: 8px; color: #3f5350; background: #fff; cursor: pointer; font-size: 11px; transition: border .15s ease, background .15s ease; }
.option:hover { border-color: #99bfb0; background: #f6faf6; }
.option input { margin-top: 3px; accent-color: var(--teal); }
.option.correct { border-color: #60a27e; background: #e9f6ec; }
.option.incorrect { border-color: #dc8a77; background: #fff0eb; }
.mc-feedback { display: none; margin: 10px 0 0; padding: 9px 11px; border-left: 3px solid var(--teal); color: #47605a; background: #edf5ee; font-size: 10px; }
.mc-feedback.visible { display: block; }
.written-prompt { color: var(--muted); font-size: 11px; }
.written-prompt textarea { width: 100%; min-height: 115px; margin: 10px 0; padding: 12px; border: 1px solid #d9e1db; border-radius: 8px; color: var(--ink); resize: vertical; }
.rubric-box { margin-top: 10px; padding: 12px; border-radius: 8px; background: #f1f4ec; }
.rubric-box summary { color: var(--teal); cursor: pointer; font-size: 10px; font-weight: 700; }
.rubric-box p { margin: 8px 0 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.self-score { display: flex; align-items: center; gap: 9px; margin-top: 11px; color: var(--ink); font-size: 10px; font-weight: 700; }
.self-score select { padding: 6px 8px; border: 1px solid #d9e1db; border-radius: 6px; background: white; }
.quiz-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 21px; }
.quiz-result { margin-top: 18px; padding: 18px; border: 1px solid #b6d3c4; border-radius: 12px; color: #16483f; background: #e8f4eb; font: 700 14px Manrope, sans-serif; }
.quiz-result small { display: block; margin-top: 5px; color: #60736b; font: 10px "DM Sans", sans-serif; }

.podcast-card { display: grid; grid-template-columns: 170px 1fr; gap: 25px; align-items: center; padding: 24px; border: 1px solid #d9e0d8; border-radius: 15px; background: var(--white); }
.podcast-art { position: relative; height: 140px; display: grid; place-items: center; overflow: hidden; border-radius: 11px; color: var(--lime); background: var(--teal-dark); font: 800 27px Manrope, sans-serif; }
.podcast-art::before, .podcast-art::after { position: absolute; content: ""; width: 126px; height: 126px; border: 1px solid rgba(184,226,211,.3); border-radius: 50%; }
.podcast-art::after { width: 86px; height: 86px; }
.podcast-art span { position: relative; z-index: 1; }
.podcast-art i { position: absolute; top: 49px; width: 3px; border-radius: 5px; background: var(--coral); }
.podcast-art i:nth-of-type(1) { left: 54px; height: 25px; }
.podcast-art i:nth-of-type(2) { left: 61px; height: 42px; top: 41px; }
.podcast-art i:nth-of-type(3) { left: 68px; height: 19px; }
.podcast-content p { color: var(--muted); font-size: 11px; }
.upload-label { display: inline-block; margin-bottom: 5px; font: 700 17px Manrope, sans-serif; }
.podcast-content input[type=file] { display: block; max-width: 100%; margin: 13px 0; color: var(--muted); font-size: 10px; }
.podcast-content audio { width: min(520px, 100%); margin: 6px 0; }
.audio-status { margin: 6px 0 0; font: 10px "DM Mono", monospace; }
.text-button { margin-top: 10px; padding: 0; border: 0; color: var(--teal); background: none; cursor: pointer; font-size: 10px; font-weight: 700; }
.text-button:hover { text-decoration: underline; }
.source-list { padding-top: 0; padding-bottom: 42px; }
.source-list p:last-child { max-width: 850px; color: var(--muted); font-size: 10px; line-height: 1.8; }
.site-footer { padding: 21px 0; color: #aabbb4; background: var(--teal-dark); font: 10px "DM Mono", monospace; }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; }
.site-footer a { color: var(--lime); text-decoration: none; }

@media (max-width: 940px) {
  .site-header { height: auto; min-height: 72px; flex-wrap: wrap; padding: 13px 24px; }
  .top-nav { width: 100%; overflow-x: auto; padding-bottom: 4px; }
  .hero { padding-inline: 32px; grid-template-columns: 1fr 1fr; }
  .hero-visual { transform: scale(.88); transform-origin: center; }
  .lesson-grid { grid-template-columns: repeat(2, 1fr); }
  .flashcard-layout { gap: 30px; }
  .flashcard-aside { max-width: none; }
}
@media (max-width: 650px) {
  .content-wrap { width: min(100% - 32px, 520px); }
  .site-header { padding-inline: 16px; }
  .top-nav { gap: 17px; }
  .top-nav a { font-size: 11px; }
  .hero { min-height: auto; display: block; padding: 58px 24px 22px; }
  .hero-visual { min-height: 300px; margin-top: 8px; transform: scale(.85); transform-origin: top center; }
  .hero-glass { left: 8%; top: 29px; }
  .orbit-one { top: 4px; }
  .orbit-two { top: 10px; }
  .hero-meta { gap: 11px; margin-top: 29px; font-size: 8px; }
  .quick-map { padding-top: 57px; }
  .section-block { padding-top: 61px; padding-bottom: 61px; }
  .section-heading h2 { font-size: 33px; }
  .spectrum { padding: 23px 14px 18px; }
  .spectrum-items { gap: 5px; }
  .spectrum-items b { font-size: 12px; }
  .spectrum-items small { font-size: 8px; }
  .lesson-grid, .two-up, .reading-columns, .vocab-panels, .flashcard-layout { grid-template-columns: 1fr; }
  .lesson-card { min-height: 0; }
  .deep-panel, .reward-panel { grid-template-columns: 1fr; gap: 18px; padding: 23px; }
  .examples-panel, .market-panel { grid-template-columns: 1fr; gap: 16px; padding: 21px; }
  .example-grid { grid-template-columns: 1fr 1fr; }
  .avatar-types { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr 1fr; }
  .reading-columns { gap: 25px; }
  .takeaway-grid { grid-template-columns: 1fr 1fr; }
  .timeline-grid { grid-template-columns: 1fr 1fr; }
  .cram-grid { grid-template-columns: 1fr; }
  .term-list, .vocab-terms .term-list { grid-template-columns: 1fr 1fr; gap: 0 12px; }
  .flashcard { min-height: 270px; padding: 25px; }
  .flashcard-aside { display: none; }
  .card-controls { gap: 5px; }
  .button-quiet { padding: 8px 10px; font-size: 10px; }
  .question-card { padding: 17px 15px; }
  .podcast-card { grid-template-columns: 1fr; }
  .podcast-art { height: 110px; }
  .footer-inner { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}