:root { color-scheme: light; --ink: #26362f; --muted: #526359; --paper: #fffdf8; --line: #d8dfd6; --accent: #236449; --soft: #edf4ec; --warm: #fff2db; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; min-height: 100vh; min-width: 280px; color: var(--ink); background: radial-gradient(ellipse at top left, #e4efe1, transparent 65%), linear-gradient(150deg, #f9f6ec, #f4f3ed); font-family: "Avenir Next", "Trebuchet MS", sans-serif; line-height: 1.5; }
button, select { font: inherit; }
button, a, select { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .65; }
a { color: var(--accent); text-underline-offset: 4px; }
:focus-visible { outline: 3px solid #a75318; outline-offset: 5px; }
.shell { max-width: 980px; margin: auto; padding: 24px; }
.header { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-bottom: 28px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-size: 13px; }
.brand img { flex-shrink: 0; }
.brand strong { display: block; color: var(--ink); font-size: 25px; letter-spacing: -.6px; }
.header-tools { display: flex; gap: 20px; align-items: center; font-size: 14px; }
select { max-width: 145px; padding: 10px; background: var(--paper); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; }
.panel { padding: clamp(20px, 4vw, 44px); border: 1px solid var(--line); border-radius: 24px; background: var(--paper); box-shadow: 0 15px 50px #26483009; }
h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.2; letter-spacing: -1px; margin: 10px 0 18px; }
h2 { font-size: 20px; margin: 0 0 12px; }
p { margin: 0 0 16px; }
.eyebrow { text-transform: uppercase; font-size: 12px; letter-spacing: 1.6px; font-weight: 700; color: var(--accent); }
.intro { max-width: 640px; color: var(--muted); font-size: 17px; }
.guide { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 28px 0; }
.guide article { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--soft); }
.guide article:nth-child(2) { background: #edf2f8; }
.guide article:nth-child(3) { background: var(--warm); }
.guide p { color: var(--muted); font-size: 14px; }
.guide article > span { font-size: 13px; font-weight: 650; }
kbd { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border: 1px solid #a8b6ac; border-bottom-width: 3px; border-radius: 7px; background: #ffffffc7; font: inherit; font-size: 16px; color: var(--ink); }
fieldset { padding: 0; margin: 24px 0; border: 0; }
legend { font-weight: 650; margin-bottom: 10px; }
.length-options { display: flex; gap: 10px; }
.length-options button { width: 64px; min-height: 46px; border: 1px solid var(--line); border-radius: 10px; background: white; color: var(--ink); }
.length-options [aria-pressed="true"] { background: var(--accent); color: white; border-color: var(--accent); }
.primary, .secondary { display: block; width: fit-content; max-width: 100%; min-height: 48px; padding: 12px 26px; border-radius: 12px; border: 1px solid var(--accent); font-weight: 700; }
.primary { color: white; background: var(--accent); }
.primary:hover:not(:disabled) { background: #174d37; }
.secondary { color: var(--accent); background: white; margin-bottom: 14px; }
#loadStatus { color: var(--muted); font-size: 14px; }
.session-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: 14px; }
.session-top p { margin: 0; }
.text-button { background: none; border: 0; padding: 12px 0; color: var(--muted); text-decoration: underline; flex-shrink: 0; }
progress { display: block; width: 100%; height: 9px; accent-color: var(--accent); margin: 12px 0 32px; border: 0; border-radius: 8px; overflow: hidden; background: var(--soft); }
progress::-webkit-progress-bar { background: var(--soft); }
progress::-webkit-progress-value { background: var(--accent); }
.practice { text-align: center; }
.word { font-size: clamp(38px, 8vw, 76px); margin: 26px 0 36px; overflow-wrap: anywhere; }
.choices { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; max-width: 660px; margin: auto; }
.choices button { min-height: 94px; display: flex; justify-content: center; align-items: center; gap: 10px; padding: 14px 8px; color: var(--ink); background: white; border: 2px solid var(--line); border-radius: 16px; font-size: 20px; font-weight: 700; }
.choices button:hover:not(:disabled) { border-color: var(--accent); background: var(--soft); }
.choices button.right { border-color: var(--accent); background: var(--soft); opacity: 1; }
.choices button.wrong { border-color: #b64736; background: #fff0e9; opacity: 1; }
.keyboard-hint { color: var(--muted); font-size: 13px; margin-top: 18px; }
.feedback { min-height: 130px; margin: 24px auto 0; max-width: 610px; }
.feedback strong { font-size: 21px; display: block; margin-bottom: 8px; }
.feedback p { margin: 6px 0; }
.feedback[data-result="correct"] strong { color: var(--accent); }
.feedback[data-result="wrong"] strong { color: #983d2e; }
#example { font-weight: 650; }
.interlude { min-height: 420px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; animation: appear .4s ease-out; }
.metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 32px 0; }
.metrics div { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--soft); }
dt { color: var(--muted); font-size: 14px; } dd { font-size: 30px; font-weight: 700; margin: 8px 0 0; }
#summary .primary { margin: 0 auto; } #summary { text-align: center; }
footer { color: var(--muted); text-align: center; font-size: 12px; padding: 24px 12px 8px; }
footer p { margin-bottom: 5px; } #version { margin-left: 16px; }
.sr-only, .skip-link:not(:focus) { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@keyframes appear { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 620px) {
  .shell { padding: 16px; } .header { flex-wrap: wrap; gap: 14px; margin-bottom: 20px; } .header-tools { width: 100%; justify-content: space-between; }
  .guide { grid-template-columns: 1fr; gap: 10px; } .guide article { padding: 16px; } .guide p { margin-bottom: 8px; }
  .choices { gap: 8px; } .choices button { flex-direction: column; font-size: 16px; min-height: 100px; }
  .metrics { grid-template-columns: 1fr; gap: 10px; } .metrics div { display: flex; align-items: center; justify-content: space-between; gap: 12px; } dd { margin: 0; }
  .session-top { align-items: flex-start; } .session-top p { padding-top: 12px; } .word { margin: 22px 0 28px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; } }

.history-card { margin: 28px 0; padding: 24px; border: 1px solid #cbd9c9; border-radius: 20px; background: linear-gradient(145deg, #fffefa, #fdfdf7); box-shadow: 0 5px 18px #26483006; }
.history-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.history-heading h2 { font-size: clamp(22px, 3vw, 29px); color: var(--accent); letter-spacing: -.6px; margin-bottom: 4px; }
.history-heading p { color: var(--muted); font-size: 14px; margin: 0; }
.history-count { flex-shrink: 0; border-radius: 24px; background: #e6eee2; padding: 6px 12px; font-size: 12px; color: var(--accent); font-weight: 650; }
.history-plot { width: 100%; margin-top: 10px; }
.history-plot svg { display: block; width: 100%; height: 240px; overflow: visible; }
.history-axis { font-size: 12px; fill: var(--muted); }
.history-grid { stroke: #ccd9cc; stroke-width: 1; stroke-dasharray: 3 3; }
.history-stem { stroke: #a2bea0; stroke-width: 1; }
.history-wave { stroke: var(--accent); stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.history-dot { stroke: var(--accent); stroke-width: 2; fill: var(--paper); }
.history-dot.latest { fill: var(--accent); }
.history-latest-pill { fill: #ecf2e7; stroke: #c0d2bc; }
.history-latest-label { fill: var(--accent); font-size: 12px; font-weight: 700; }
.history-direction { display: flex; justify-content: space-between; gap: 12px; padding: 0 20px 0 48px; margin-top: -20px; font-size: 12px; color: var(--muted); }
.history-empty { margin: 22px 0; padding: 26px 14px; border-radius: 12px; background: var(--soft); color: var(--muted); text-align: center; }
.history-note { font-size: 12px; color: var(--muted); margin: 18px 0 0; }
.history-note.warning, .history-save-warning { color: #983d2e; }
.history-details { margin-top: 10px; font-size: 13px; }
.history-details summary { cursor: pointer; color: var(--accent); width: fit-content; min-height: 36px; padding: 8px 0; }
.history-details table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.history-details th, .history-details td { padding: 8px 4px; border-bottom: 1px solid var(--line); text-align: left; }
.history-details td:last-child, .history-details th:last-child { text-align: right; }
@media (max-width: 620px) {
  .history-card { padding: 14px 10px; margin: 24px -6px; }
  .history-heading { flex-wrap: wrap; gap: 10px; padding: 0 4px; }
  .history-heading h2 { font-size: 23px; }
  .history-count { font-size: 11px; }
  .history-note, .history-details { margin-left: 4px; margin-right: 4px; }
}