:root {
  color-scheme: light;
  --bg: #f8f7f4;
  --paper: #fffefa;
  --ink: #242133;
  --muted: #5b586b;
  --purple: #5940cc;
  --deep: #4930bb;
  --line: #e7e2ec;
  font: 16px/1.55 system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--deep); text-underline-offset: .2em; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--purple); outline-offset: 4px; }
h1, h2 { font-family: Georgia, serif; line-height: 1.12; letter-spacing: -.025em; }
h1 { font-size: clamp(2.35rem, 6vw, 4rem); margin: .3em 0; max-width: 13em; }
h2 { font-size: clamp(1.65rem, 4vw, 2.4rem); margin: 0 0 .35em; }
h3 { font-size: 1.07rem; margin: 0; }
p { margin: 0 0 1rem; }
.wrap { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
.site-header, .site-footer { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; padding: 18px 0; }
.site-header { justify-content: space-between; }
.site-header nav { display: flex; flex-wrap: wrap; align-items: center; gap: clamp(10px, 3vw, 26px); font-size: .9rem; }
.site-header nav a { font-weight: 650; text-decoration: none; }
.site-header nav a[aria-current] { text-decoration: underline; }
.brand { display: inline-flex; align-items: center; color: var(--ink); font: bold 1.9rem Georgia, serif; letter-spacing: -.04em; text-decoration: none; }
.brand span { color: var(--purple); }
.brand .brand-icon { display: grid; place-items: center; margin-right: 8px; width: 33px; height: 33px; border-radius: 10px; color: white; background: var(--purple); font: 1.2rem system-ui, sans-serif; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: white; padding: 6px 10px; z-index: 1; }
.hero { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 10px; padding: clamp(22px, 5vw, 52px); border: 1px solid #e2d7fa; border-radius: 24px; background: #ece5fe; }
.eyebrow { color: var(--deep); font-size: .72rem; font-weight: 750; letter-spacing: .13em; margin-bottom: 8px; }
.intro, .section > p { max-width: 66ch; color: var(--muted); }
.intro { font-size: 1.06rem; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.button { display: inline-block; padding: .72em 1.05em; border-radius: 9px; color: white; background: var(--purple); font-size: .94rem; font-weight: 700; text-decoration: none; }
.button:hover { background: var(--deep); }
.button.small { padding: .55em .75em; }
.secondary { font-size: .94rem; font-weight: 650; }
.details { margin: 12px 0 0; color: var(--muted); font-size: .85rem; }
.wave { width: clamp(140px, 28vw, 320px); height: auto; }
.section { margin-block: clamp(24px, 5vw, 48px); }
.chapter-list, .practice-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 12px; }
.chapter-list { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.chapter-list li, .practice-list li, .note { border: 1px solid var(--line); border-radius: 15px; background: var(--paper); padding: 17px 19px; }
.chapter-list li { display: flex; gap: 11px; }
.chapter-list p, .practice-list li > p { color: var(--muted); margin: 3px 0; }
.chapter-list .example { color: var(--deep); margin-top: 9px; }
.number { color: var(--deep); background: #eee9ff; padding: 4px 8px; border-radius: 7px; align-self: start; font-size: .8rem; font-weight: 750; }
.practice-list li > p { margin: 5px 0 12px; }
details { background: #f2edff; border-radius: 9px; padding: 9px 12px; }
summary { color: var(--deep); cursor: pointer; font-weight: 650; }
details p { margin: 4px 0; }
details .phrase { margin-top: 10px; color: var(--ink); font: 1.28rem Georgia, serif; }
.note { padding: clamp(16px, 4vw, 28px); }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .86rem; margin-bottom: 12px; }
.site-footer span { margin-right: auto; }
@media (max-width: 620px) {
  .wrap { width: calc(100% - 28px); }
  .hero { grid-template-columns: 1fr; }
  .wave { display: none; }
}
[hidden] { display: none !important; }
button, input, select { font: inherit; }
button:focus-visible, input:focus-visible, select:focus-visible, h2:focus-visible { outline: 2px solid var(--purple); outline-offset: 4px; }
button { cursor: pointer; }
button:disabled { cursor: default; opacity: .5; }
button.button { border: 1px solid var(--purple); }
button.outline { border: 1px solid #d6c9f2; color: var(--deep); background: var(--paper); font-weight: 650; border-radius: 9px; padding: .62em .9em; font-size: .94rem; }
button.outline:hover:not(:disabled) { background: #f2edff; }
.language-list { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); list-style: none; margin: 20px 0 0; padding: 0; }
.language-list a { position: relative; display: grid; gap: 3px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); text-decoration: none; }
.language-list a:hover { border-color: #ae9bea; background: #f5f0ff; }
.language-list strong { color: var(--ink); font-size: 1.18rem; }
.language-list span { font-size: .87rem; }
.card-arrow { position: absolute; top: 14px; right: 13px; }
.chapter-list h3 a { color: var(--ink); }
.studio-head { display: flex; align-items: end; justify-content: space-between; flex-wrap: wrap; gap: 14px; margin: 24px 0; }
.studio-head h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: 0; }
label { display: grid; gap: 5px; font-size: .88rem; font-weight: 700; }
select, input { min-width: 0; min-height: 44px; border: 1px solid #c9bedb; background: var(--paper); color: var(--ink); border-radius: 9px; padding: 8px 12px; }
.studio-layout { display: grid; grid-template-columns: minmax(195px, 1fr) minmax(0, 2.65fr); align-items: start; gap: 18px; }
.studio-sidebar, .studio-card { border: 1px solid var(--line); background: var(--paper); border-radius: 18px; padding: clamp(16px, 3vw, 28px); }
.studio-sidebar { padding: 15px; }
.studio-sidebar ol { padding: 0; margin: 0; list-style: none; display: grid; gap: 4px; }
.chapter-button { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: start; text-align: left; width: 100%; border: 1px solid transparent; background: transparent; color: var(--ink); padding: 9px 7px; border-radius: 9px; font-size: .86rem; }
.chapter-button:hover, .chapter-button[aria-current] { background: #f2edff; border-color: #e2d7fa; }
.chapter-button span { color: var(--deep); font-weight: 700; }
.progress-summary { margin-top: 14px; border-top: 1px solid var(--line); padding-top: 12px; }
progress { width: 100%; accent-color: var(--purple); }
#progress-text, .lesson-kind { color: var(--muted); font-size: .9rem; margin: 2px 0 0; }
.exercise { background: #f4efff; border: 1px solid #e2d7fa; border-radius: 14px; margin-top: 16px; padding: clamp(14px, 3vw, 24px); }
.sample { font: clamp(1.4rem, 4vw, 2.15rem)/1.22 Georgia, serif; margin: 0 0 6px; }
.meaning { color: var(--deep); }
.attempt { margin-top: 16px; }
#answer-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 8px; margin-top: 14px; }
#answer-form label { grid-column: 1 / -1; }
.feedback { white-space: pre-line; overflow-wrap: anywhere; color: var(--deep); margin: 12px 0; }
.feedback:empty { margin-bottom: 0; }
#tip-copy { padding-top: 6px; }
.lesson-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between; margin-top: 16px; }
.studio-foot { margin-bottom: 24px; }
@media (max-width: 680px) {
  .studio-layout { grid-template-columns: minmax(0, 1fr); }
  .studio-card { grid-row: 1; }
  .studio-sidebar ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}