/* PrepPop — warm paper, ink, and a tangerine pop. */

:root {
  --bg: #fbf7f0;
  --surface: #ffffff;
  --surface-2: #f4eee4;
  --ink: #1b1a1f;
  --ink-2: #5d5a66;
  --ink-3: #6f6b79;
  --line: #e7dfd2;
  --pop: #ff5a36;
  --pop-hover: #ec4a27;
  --pop-soft: #ffe6de;
  --on-pop: #1b1a1f; /* dark text on orange: 5.6:1 */
  --pop-ink: #b8360f; /* orange for small text: 5.5:1 */
  --sun: #ffc53d;
  --know: #0e744d;
  --know-soft: #dcf3e8;
  --learn: #b02d5f;
  --learn-soft: #fbe2ec;
  --focus: #2f6bff;
  --shadow: 0 1px 2px rgb(40 30 10 / 0.06), 0 8px 24px -12px rgb(40 30 10 / 0.18);
  --shadow-lg: 0 2px 4px rgb(40 30 10 / 0.05), 0 24px 48px -20px rgb(40 30 10 / 0.3);
  --radius: 18px;
  --radius-sm: 12px;
  --font-display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --font-body: "DM Sans", ui-sans-serif, system-ui, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131217;
    --surface: #1d1c22;
    --surface-2: #26252d;
    --ink: #f4f1ea;
    --ink-2: #b1adbb;
    --ink-3: #9793a1;
    --line: #34323c;
    --pop: #ff6b4a;
    --pop-hover: #ff8468;
    --pop-soft: #3a211b;
    --on-pop: #1b0d09;
    --pop-ink: #ff8a6b;
    --know: #43d79f;
    --know-soft: #16342a;
    --learn: #ff7aa9;
    --learn-soft: #3a1c28;
    --focus: #7ea2ff;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4), 0 8px 24px -12px rgb(0 0 0 / 0.6);
    --shadow-lg: 0 2px 4px rgb(0 0 0 / 0.4), 0 24px 48px -20px rgb(0 0 0 / 0.8);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

/* The hidden attribute always wins over component display rules. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.1; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 800; }
h2 { font-size: 1.25rem; font-weight: 600; }
p { margin: 0; }
a { color: inherit; }
button, input, textarea { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 6px; }

.wrap { width: 100%; max-width: 980px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 12px; z-index: 10; background: var(--surface); padding: 8px 12px; border-radius: 8px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 5; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 800; font-size: 1.35rem; text-decoration: none; letter-spacing: -0.02em; }
.logo-mark { position: relative; width: 28px; height: 24px; }
.logo-mark span { position: absolute; inset: 0; border-radius: 6px; }
.logo-mark span:first-child { background: var(--pop); transform: rotate(-10deg) translate(-2px, 1px); }
.logo-mark span:last-child { background: var(--sun); transform: rotate(4deg) translate(3px, -1px); }
.site-nav { display: flex; gap: 4px; }
.site-nav a { text-decoration: none; padding: 8px 12px; border-radius: 999px; color: var(--ink-2); font-weight: 500; }
.site-nav a:hover { color: var(--ink); background: var(--surface-2); }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }

main { padding-top: 32px; padding-bottom: 96px; outline: none; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 18px; border-radius: 999px; border: 1px solid transparent;
  font-weight: 700; font-size: 0.95rem; text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background-color .15s, border-color .15s, transform .1s, color .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--pop); color: var(--on-pop); }
.btn-primary:hover:not(:disabled) { background: var(--pop-hover); }
.btn-soft { background: var(--surface-2); color: var(--ink); }
.btn-soft:hover { background: var(--line); }
.btn-ghost { background: transparent; color: var(--ink-2); border-color: var(--line); }
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-3); }
.btn-danger { background: transparent; color: var(--learn); border-color: color-mix(in srgb, var(--learn) 35%, transparent); }
.btn-danger:hover { background: var(--learn-soft); }
.btn-lg { min-height: 54px; padding: 0 26px; font-size: 1.02rem; }
.btn-know { background: var(--know-soft); color: var(--know); border-color: color-mix(in srgb, var(--know) 30%, transparent); }
.btn-know:hover { background: color-mix(in srgb, var(--know-soft) 70%, var(--know) 30%); }
.btn-learn { background: var(--learn-soft); color: var(--learn); border-color: color-mix(in srgb, var(--learn) 30%, transparent); }
.btn-learn:hover { background: color-mix(in srgb, var(--learn-soft) 70%, var(--learn) 30%); }
kbd { font-family: var(--font-body); font-size: .75rem; font-weight: 700; padding: 1px 6px; border-radius: 6px; border: 1px solid currentColor; opacity: .6; }

/* Page head */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.page-head .lede { color: var(--ink-2); margin-top: 6px; }
.head-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.back { display: inline-block; color: var(--ink-2); text-decoration: none; font-weight: 500; margin-bottom: 8px; font-size: .95rem; }
.back:hover { color: var(--ink); }

/* Library */
.deck-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.deck-tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 14px; }
.deck-tile h2 { overflow-wrap: anywhere; }
.deck-tile .meta { color: var(--ink-2); font-size: .92rem; margin-top: 4px; }
.meter { height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; display: flex; }
.meter span { display: block; height: 100%; }
.meter .m-know { background: var(--know); }
.meter .m-learn { background: var(--learn); opacity: .75; }
.legend { display: flex; gap: 14px; font-size: .85rem; color: var(--ink-2); flex-wrap: wrap; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: 1px; }
.dot.know { background: var(--know); }
.dot.learn { background: var(--learn); }
.deck-actions { display: flex; gap: 8px; margin-top: auto; flex-wrap: wrap; }
.deck-actions .btn { min-height: 40px; padding: 0 14px; }

.empty { text-align: center; padding: 56px 16px; max-width: 520px; margin: 0 auto; }
.empty-art { position: relative; width: 150px; height: 110px; margin: 0 auto 40px; }
.empty-art span { position: absolute; inset: 0; border-radius: 16px; box-shadow: var(--shadow-lg); }
.empty-art span:nth-child(1) { background: var(--sun); transform: rotate(-12deg) translate(-18px, 6px); }
.empty-art span:nth-child(2) { background: var(--pop); transform: rotate(6deg) translate(14px, -4px); }
.empty-art span:nth-child(3) { background: var(--surface); border: 1px solid var(--line); display: grid; place-items: center; font-family: var(--font-display); font-weight: 800; font-size: 1.6rem; color: var(--ink); }
.empty p { color: var(--ink-2); margin: 12px 0 26px; }
.empty .actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* Forms */
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field-label { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); }
.input { width: 100%; background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--radius-sm); padding: 11px 14px; resize: vertical; transition: border-color .15s; }
.input:hover { border-color: var(--ink-3); }
.input:focus { border-color: var(--focus); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent); }
.input::placeholder { color: var(--ink-3); }
.input-lg { font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; padding: 14px 16px; }
textarea.input { min-height: 52px; line-height: 1.45; }
.form-error { color: var(--learn); font-weight: 600; margin-top: 12px; }

.card-list { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-direction: column; gap: 12px; }
.card-row { position: relative; display: grid; grid-template-columns: 32px 1fr 1fr 40px; gap: 14px; align-items: start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card-row.invalid { border-color: var(--learn); }
.card-num { font-family: var(--font-display); font-weight: 800; color: var(--ink-3); padding-top: 32px; text-align: center; }
.icon-btn { width: 40px; height: 40px; margin-top: 26px; display: grid; place-items: center; border-radius: 50%; border: 0; background: transparent; color: var(--ink-3); cursor: pointer; font-size: 1.4rem; line-height: 1; }
.icon-btn:hover { background: var(--learn-soft); color: var(--learn); }
@media (max-width: 640px) {
  .card-row { grid-template-columns: 1fr 40px; }
  .card-num { grid-column: 1; padding-top: 0; text-align: left; }
  .card-row .field { grid-column: 1 / -1; }
  .icon-btn { grid-column: 2; grid-row: 1; margin-top: -8px; justify-self: end; }
}
.add-card { width: 100%; margin-top: 12px; min-height: 64px; border: 2px dashed var(--line); border-radius: var(--radius); background: transparent; color: var(--ink-2); font-weight: 700; cursor: pointer; transition: border-color .15s, color .15s, background-color .15s; }
.add-card:hover { border-color: var(--pop); color: var(--pop-ink); background: var(--pop-soft); }
.editor-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 24px; color: var(--ink-2); flex-wrap: wrap; }

/* Segmented control */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 20px; }
.seg { display: inline-flex; background: var(--surface-2); border-radius: 999px; padding: 4px; }
.seg button { border: 0; background: transparent; padding: 7px 14px; border-radius: 999px; font-weight: 600; font-size: .9rem; color: var(--ink-2); cursor: pointer; white-space: nowrap; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.seg button:disabled { opacity: .45; cursor: not-allowed; }
.toolbar .btn { min-height: 38px; font-size: .9rem; }

/* Progress */
.progress { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.progress-track { flex: 1; height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.progress-track span { display: block; height: 100%; background: var(--pop); border-radius: 999px; transition: width .3s ease; }
.progress-label { font-variant-numeric: tabular-nums; color: var(--ink-2); font-weight: 600; font-size: .92rem; min-width: 4.5ch; text-align: right; }

/* Flip card */
.flip-card { display: block; width: 100%; border: 0; padding: 0; background: none; cursor: pointer; perspective: 1600px; text-align: center; border-radius: 24px; }
.flip-inner { position: relative; display: block; min-height: clamp(260px, 44vh, 400px); transition: transform .55s cubic-bezier(.3,.7,.2,1); transform-style: preserve-3d; }
.flip-card.flipped .flip-inner { transform: rotateY(180deg); }
.face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; padding: 40px 28px; border-radius: 24px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-lg); backface-visibility: hidden; -webkit-backface-visibility: hidden; overflow: auto; }
.face.back { transform: rotateY(180deg); background: linear-gradient(160deg, var(--surface) 55%, var(--pop-soft)); }
.face-label { position: absolute; top: 18px; left: 22px; font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); }
.face-status { position: absolute; top: 14px; right: 16px; }
.face-text { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.4rem, 3.4vw, 2.2rem); line-height: 1.25; max-width: 34ch; overflow-wrap: anywhere; white-space: pre-wrap; }
.face.back .face-text { font-family: var(--font-body); font-weight: 500; font-size: clamp(1.1rem, 2.4vw, 1.45rem); line-height: 1.5; max-width: 44ch; }
.face-hint { position: absolute; bottom: 16px; font-size: .82rem; color: var(--ink-3); }
@media (prefers-reduced-motion: reduce) {
  .flip-inner { transition: none; }
  .progress-track span { transition: none; }
}

.chip { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: .78rem; font-weight: 700; }
.chip.know { background: var(--know-soft); color: var(--know); }
.chip.learn { background: var(--learn-soft); color: var(--learn); }
.chip.new { background: var(--surface-2); color: var(--ink-2); }

.mark-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
.mark-row .btn { min-height: 56px; font-size: 1rem; }
.kbd-hint { text-align: center; color: var(--ink-3); font-size: .85rem; margin-top: 14px; }
@media (hover: none) { .kbd-hint, .mark-row kbd, .option .opt-key { display: none; } }

/* Result screens */
.result { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 40px 28px; text-align: center; box-shadow: var(--shadow-lg); }
.result .big { font-family: var(--font-display); font-weight: 800; font-size: clamp(3rem, 9vw, 4.5rem); line-height: 1; letter-spacing: -0.03em; }
.result .sub { color: var(--ink-2); margin-top: 10px; }
.result .tallies { display: flex; gap: 12px; justify-content: center; margin: 24px 0 8px; flex-wrap: wrap; }
.tally { min-width: 140px; padding: 14px 18px; border-radius: var(--radius-sm); }
.tally strong { display: block; font-family: var(--font-display); font-size: 1.8rem; }
.tally.know { background: var(--know-soft); color: var(--know); }
.tally.learn { background: var(--learn-soft); color: var(--learn); }
.result .actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }

.missed { margin-top: 28px; text-align: left; }
.missed h2 { margin-bottom: 12px; }
.missed ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.missed li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 16px; }
.missed .m-prompt { font-weight: 700; overflow-wrap: anywhere; }
.missed .m-answer { color: var(--know); margin-top: 4px; overflow-wrap: anywhere; }
.missed .m-picked { color: var(--learn); margin-top: 2px; font-size: .92rem; text-decoration: line-through; overflow-wrap: anywhere; }

/* Test */
.choice-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 12px 0 24px; }
.choice { position: relative; display: block; cursor: pointer; }
.choice input { position: absolute; opacity: 0; }
.choice span { display: block; height: 100%; padding: 18px; border-radius: var(--radius); border: 1.5px solid var(--line); background: var(--surface); transition: border-color .15s, box-shadow .15s; }
.choice strong { display: block; font-family: var(--font-display); font-size: 1.1rem; margin-bottom: 4px; }
.choice small { color: var(--ink-2); font-size: .9rem; }
.choice input:checked + span { border-color: var(--pop); box-shadow: 0 0 0 3px color-mix(in srgb, var(--pop) 22%, transparent); }
.choice input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.setup-label { font-weight: 700; margin-top: 8px; }

.notice { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--surface-2); color: var(--ink-2); font-size: .95rem; margin-bottom: 20px; }
.notice.ai { background: var(--pop-soft); color: var(--ink); }
.notice.warn { background: var(--learn-soft); color: var(--ink); }
.notice a { font-weight: 700; }
.spark { color: var(--pop-ink); font-weight: 800; }

.q-card { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 44px 28px 36px; text-align: center; box-shadow: var(--shadow-lg); position: relative; }
.q-prompt { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.3rem, 3.2vw, 2rem); line-height: 1.3; overflow-wrap: anywhere; white-space: pre-wrap; }
.q-card.def .q-prompt { font-family: var(--font-body); font-weight: 500; font-size: clamp(1.1rem, 2.4vw, 1.4rem); line-height: 1.5; }
.q-instruction { color: var(--ink-2); font-weight: 600; margin: 22px 0 12px; }
.options { display: grid; gap: 10px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .options { grid-template-columns: 1fr 1fr; } }
.option { display: flex; align-items: flex-start; gap: 14px; width: 100%; text-align: left; padding: 16px 18px; min-height: 64px; border-radius: var(--radius); border: 1.5px solid var(--line); background: var(--surface); cursor: pointer; font-size: 1rem; line-height: 1.45; transition: border-color .15s, background-color .15s, transform .1s; }
.option:hover:not(:disabled) { border-color: var(--pop); }
.option:active:not(:disabled) { transform: translateY(1px); }
.option .opt-key { flex: none; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; background: var(--surface-2); font-weight: 700; font-size: .85rem; color: var(--ink-2); }
.option .opt-text { overflow-wrap: anywhere; padding-top: 1px; }
.option:disabled { cursor: default; }
.option.dim { opacity: .5; }
.option.is-correct { border-color: var(--know); background: var(--know-soft); opacity: 1; }
.option.is-correct .opt-key { background: var(--know); color: var(--surface); }
.option.is-wrong { border-color: var(--learn); background: var(--learn-soft); opacity: 1; }
.option.is-wrong .opt-key { background: var(--learn); color: var(--surface); }
.q-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; min-height: 54px; flex-wrap: wrap; }
.feedback { font-weight: 700; }
.feedback.good { color: var(--know); }
.feedback.bad { color: var(--learn); }
.source-tag { color: var(--ink-3); font-size: .85rem; margin-top: 18px; }

.loading { text-align: center; padding: 72px 16px; }
.loader { display: inline-flex; gap: 8px; margin-bottom: 22px; }
.loader span { width: 18px; height: 24px; border-radius: 5px; background: var(--pop); animation: pop 1s ease-in-out infinite; }
.loader span:nth-child(2) { background: var(--sun); animation-delay: .15s; }
.loader span:nth-child(3) { background: var(--know); animation-delay: .3s; }
@keyframes pop { 0%, 100% { transform: translateY(0) rotate(0); } 40% { transform: translateY(-12px) rotate(-8deg); } }
@media (prefers-reduced-motion: reduce) { .loader span { animation: none; } }
.loading p { color: var(--ink-2); }

/* Settings */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin-bottom: 16px; display: flex; flex-direction: column; gap: 14px; max-width: 680px; }
.panel p { color: var(--ink-2); }
.hint { font-size: .88rem; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); background: var(--ink); color: var(--bg); padding: 12px 18px; border-radius: 999px; font-weight: 600; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; max-width: calc(100% - 32px); text-align: center; z-index: 20; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.card-tools { text-align: center; margin-top: 18px; }
.text-btn { border: 0; background: none; padding: 6px 8px; border-radius: 8px; font-weight: 600; font-size: .9rem; color: var(--ink-3); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.text-btn.danger:hover { color: var(--learn); }

/* Paste-a-list import */
.import-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.import-bar .hint { color: var(--ink-2); }
.import-panel { max-width: none; margin: 16px 0 0; }
.import-options { gap: 16px; }
.inline-field { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-weight: 600; font-size: .92rem; color: var(--ink-2); }
.select { width: auto; padding: 8px 12px; resize: none; }
.check { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: .92rem; color: var(--ink-2); cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--pop); }
.import-preview { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.import-preview li { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 12px; padding: 8px 12px; border-radius: 10px; background: var(--surface-2); font-size: .92rem; overflow-wrap: anywhere; }
.import-preview li span { color: var(--ink-2); }
.import-preview li.more { display: block; background: none; color: var(--ink-3); padding: 2px 12px; }

/* Subjects */
:root {
  --subj-biology: #2b8a3e; --subj-clinical: #0b7285; --subj-spanish: #e03131; --subj-history: #b35c00;
  --subj-english: #1971c2; --subj-geometry: #6741d9; --subj-other: #868e96;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --subj-biology: #51cf66; --subj-clinical: #3bc9db; --subj-spanish: #ff6b6b; --subj-history: #ffa94d;
    --subj-english: #4dabf7; --subj-geometry: #9775fa; --subj-other: #adb5bd;
  }
}
[data-subject="biology"] { --subj: var(--subj-biology); }
[data-subject="clinical"] { --subj: var(--subj-clinical); }
[data-subject="spanish"] { --subj: var(--subj-spanish); }
[data-subject="history"] { --subj: var(--subj-history); }
[data-subject="english"] { --subj: var(--subj-english); }
[data-subject="geometry"] { --subj: var(--subj-geometry); }
[data-subject="other"] { --subj: var(--subj-other); }
.subject-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--subj, var(--ink-3)); flex: none; }

.subject-group { margin-bottom: 32px; }
.group-head { display: flex; align-items: center; gap: 10px; font-size: 1.1rem; margin-bottom: 14px; }
.group-count { font-family: var(--font-body); font-weight: 500; font-size: .88rem; color: var(--ink-3); }
.deck-tile { border-top: 4px solid var(--subj, var(--line)); }
.deck-tile h3 { font-size: 1.2rem; overflow-wrap: anywhere; }
.tile-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.tile-tools { display: flex; gap: 2px; margin: -6px -8px 0 0; flex: none; }
.tile-tools .text-btn { text-decoration: none; color: var(--ink-2); }
.tile-tools .text-btn:hover { color: var(--ink); background: var(--surface-2); }
.tile-tools .text-btn.danger:hover { color: var(--learn); background: var(--learn-soft); }
.deck-actions .btn { flex: 1; }

.subject-picker { border: 0; padding: 0; margin: 20px 0 0; }
.subject-picker legend { margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-radio { position: relative; cursor: pointer; }
.chip-radio input { position: absolute; opacity: 0; }
.chip-radio > span { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 14px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--surface); font-weight: 600; font-size: .92rem; color: var(--ink-2); transition: border-color .15s, background-color .15s; }
.chip-radio:hover > span { border-color: var(--ink-3); }
.chip-radio input:checked + span { border-color: var(--subj); color: var(--ink); background: color-mix(in srgb, var(--subj) 12%, var(--surface)); }
.chip-radio input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }

/* Today panel */
.today { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow); margin-bottom: 32px; display: grid; gap: 12px; background-image: linear-gradient(135deg, var(--pop-soft), transparent 55%); }
.today-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.today h2 { font-size: 1.35rem; }
.today-line { font-size: 1.05rem; }
.today-line strong { font-family: var(--font-display); font-size: 1.2rem; }
.streak { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px 4px 8px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); font-size: .9rem; }
.streak .flame { width: 18px; height: 18px; color: var(--ink-3); }
.streak.on { background: var(--sun); color: #3a2a00; }
.streak.on .flame { color: var(--pop); }
.goal { display: flex; align-items: center; gap: 12px; }
.goal-track { flex: 1; height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.goal-track span { display: block; height: 100%; background: var(--know); border-radius: 999px; }
.goal-label { font-size: .88rem; color: var(--ink-2); font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.today-action .btn { width: 100%; }
@media (min-width: 720px) { .today-action .btn { width: auto; } }
.meta .due { color: var(--pop-ink); font-weight: 700; }

.deck-context { display: inline-flex; align-items: center; gap: 8px; text-transform: none; letter-spacing: 0; font-size: .85rem; color: var(--ink-2); max-width: 70vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Swipe feedback on the flip card */
.swipe-hint { display: none; text-align: center; color: var(--ink-3); font-size: .85rem; margin-top: 14px; }
@media (hover: none) { .swipe-hint { display: block; } }
.flip-card { touch-action: pan-y; transition: transform .2s ease; }
.flip-card.swipe-right .face { box-shadow: 0 0 0 3px var(--know), var(--shadow-lg); }
.flip-card.swipe-left .face { box-shadow: 0 0 0 3px var(--learn), var(--shadow-lg); }
@media (prefers-reduced-motion: reduce) { .flip-card { transition: none; } }

/* Write mode */
.write-form { margin-top: 20px; display: flex; flex-direction: column; gap: 14px; }
.write-input { font-size: 1.15rem; padding: 14px 16px; }
input.write-input { min-height: 54px; }
.write-input[readonly] { background: var(--surface-2); }
.accent-keys { display: flex; flex-wrap: wrap; gap: 6px; }
.accent-key { min-width: 44px; min-height: 44px; border-radius: 10px; border: 1.5px solid var(--line); background: var(--surface); font-size: 1.1rem; font-weight: 600; cursor: pointer; }
.accent-key:hover { border-color: var(--pop); }
.write-actions { gap: 10px; }
.write-feedback { border-radius: var(--radius-sm); padding: 14px 16px; border: 1.5px solid; }
.write-feedback.good { border-color: var(--know); background: var(--know-soft); }
.write-feedback.bad { border-color: var(--learn); background: var(--learn-soft); }
.write-feedback .expected { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; margin-top: 4px; overflow-wrap: anywhere; }
.write-feedback .typed { color: var(--ink-2); text-decoration: line-through; margin-top: 4px; overflow-wrap: anywhere; }
.deck-actions .btn { padding: 0 10px; }
@media (hover: none) { kbd { display: none; } }

/* Mode tabs on deck screens */
.deck-head { margin-bottom: 14px; }
.mode-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 22px; overflow-x: auto; scrollbar-width: none; }
.mode-tabs a { position: relative; padding: 10px 14px 12px; text-decoration: none; font-weight: 700; color: var(--ink-2); white-space: nowrap; border-radius: 10px 10px 0 0; }
.mode-tabs a:hover { color: var(--ink); background: var(--surface-2); }
.mode-tabs a[aria-current="page"] { color: var(--ink); }
.mode-tabs a[aria-current="page"]::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 3px; border-radius: 3px; background: var(--subj, var(--pop)); }

/* Settings: backup */
.file-btn { position: relative; overflow: hidden; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; font-size: 0; }
.file-btn:focus-within { outline: 3px solid var(--focus); outline-offset: 2px; }
.restore-box { border: 1.5px solid var(--pop); border-radius: var(--radius-sm); padding: 16px; display: grid; gap: 10px; background: var(--pop-soft); }
.restore-box h3 { font-size: 1.1rem; }
.restore-box p { color: var(--ink); }
.panel .seg { flex-wrap: wrap; align-self: flex-start; }
.restore-hint { margin-top: 22px !important; font-size: .92rem; }
.restore-hint a { font-weight: 700; }
.backup-nudge { align-items: center; justify-content: space-between; flex-wrap: wrap; }
.backup-nudge .btn { min-height: 38px; }

/* Installed app: keep content clear of the notch and home indicator */
.site-header { padding-top: env(safe-area-inset-top); }
main { padding-bottom: calc(96px + env(safe-area-inset-bottom)); }
.toast { bottom: calc(24px + env(safe-area-inset-bottom)); }
.steps { margin: 0; padding-left: 22px; color: var(--ink-2); display: grid; gap: 4px; }
.steps strong { color: var(--ink); }

/* Due badge on the Review nav item */
.nav-badge { display: inline-grid; place-items: center; min-width: 20px; height: 20px; padding: 0 6px; margin-left: 6px; border-radius: 999px; background: var(--pop); color: var(--on-pop); font-size: .72rem; font-weight: 800; vertical-align: 1px; }

/* Phone tab bar */
.tab-bar { display: none; }
@media (max-width: 719px) {
  .site-nav { display: none; }
  .tab-bar {
    display: grid; grid-template-columns: repeat(5, 1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 6;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
    background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(10px);
    border-top: 1px solid var(--line);
  }
  .tab-bar a { position: relative; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 0; min-height: 52px; text-decoration: none; color: var(--ink-3); font-size: .72rem; font-weight: 700; border-radius: 12px; }
  .tab-bar svg { width: 24px; height: 24px; }
  .tab-bar a[aria-current="page"] { color: var(--pop-ink); }
  .tab-bar .nav-badge { position: absolute; top: 2px; left: calc(50% + 6px); margin: 0; min-width: 18px; height: 18px; font-size: .66rem; }
  main { padding-bottom: calc(110px + env(safe-area-inset-bottom)); }
  .toast { bottom: calc(88px + env(safe-area-inset-bottom)); }
  body.typing .tab-bar { display: none; }
}

/* Test setup and question types */
.setup { display: grid; gap: 18px; margin-bottom: 22px; }
.setup-row { display: grid; gap: 8px; }
.setup-row .setup-label { margin: 0; font-weight: 700; }
.chip-check { position: relative; cursor: pointer; }
.chip-check input { position: absolute; opacity: 0; }
.chip-check span { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 14px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--surface); font-weight: 600; font-size: .92rem; color: var(--ink-2); }
.chip-check span::before { content: ""; width: 16px; height: 16px; border-radius: 5px; border: 2px solid var(--ink-3); flex: none; }
.chip-check input:checked + span { border-color: var(--pop); color: var(--ink); background: var(--pop-soft); }
.chip-check input:checked + span::before { background: var(--pop) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 8.5l3 3 6-7' fill='none' stroke='white' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/12px no-repeat; border-color: var(--pop); }
.chip-check input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.q-type { position: absolute; top: 14px; right: 18px; font-size: .75rem; font-weight: 700; color: var(--ink-3); }
.tf-statement { font-size: 1.15rem; font-weight: 600; padding: 16px 18px; border-radius: var(--radius-sm); background: var(--surface-2); margin-bottom: 12px; overflow-wrap: anywhere; }
.options.tf { grid-template-columns: 1fr 1fr; }
.q-foot .row { gap: 10px; }

/* Read aloud */
.card-stage { position: relative; }
.speak-btn { position: absolute; right: 14px; bottom: 12px; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; z-index: 2; box-shadow: var(--shadow); }
.speak-btn:hover { color: var(--pop-ink); border-color: var(--pop); }
.speak-btn svg, .hear svg { width: 22px; height: 22px; }
.hear { display: inline-flex; align-items: center; gap: 6px; margin-top: 6px; padding-left: 0; text-decoration: none; color: var(--ink-2); }
.hear:hover { color: var(--pop-ink); }

/* Starter decks */
.starter-preview { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: .9rem; color: var(--ink-2); }
.starter-preview li { overflow-wrap: anywhere; }
.starter-preview strong { color: var(--ink); margin-right: 4px; }
.starter-tile .meta { line-height: 1.4; }

/* Progress */
.panel.wide { max-width: none; }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 16px; }
@media (min-width: 720px) { .stat-grid { grid-template-columns: repeat(4, 1fr); } }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; display: grid; gap: 2px; }
.stat strong { font-family: var(--font-display); font-size: 2rem; line-height: 1; }
.stat span { color: var(--ink-2); font-size: .9rem; }
.cal-wrap { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; }
.cal-days { display: grid; grid-template-rows: repeat(7, 1fr); gap: 4px; font-size: .68rem; color: var(--ink-3); }
.cal-days span { height: 16px; line-height: 16px; }
.cal { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 16px); grid-auto-columns: 16px; gap: 4px; }
.cal-cell { display: inline-block; width: 16px; height: 16px; border-radius: 4px; background: var(--surface-2); }
.cal-cell.l-1 { background: transparent; }
.cal-cell.l1 { background: color-mix(in srgb, var(--know) 30%, var(--surface-2)); }
.cal-cell.l2 { background: color-mix(in srgb, var(--know) 55%, var(--surface-2)); }
.cal-cell.l3 { background: color-mix(in srgb, var(--know) 80%, var(--surface-2)); }
.cal-cell.l4 { background: var(--know); }
.cal-legend { display: flex; align-items: center; gap: 4px; font-size: .8rem; color: var(--ink-3); }
.cal-legend .cal-cell { width: 12px; height: 12px; }
.upcoming { list-style: none; margin: 0; padding: 0; display: flex; gap: 20px; flex-wrap: wrap; color: var(--ink-2); }
.upcoming strong { font-family: var(--font-display); font-size: 1.4rem; color: var(--ink); margin-right: 4px; }
.mastery { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.mastery-head { display: flex; justify-content: space-between; gap: 12px; font-weight: 600; margin-bottom: 6px; font-size: .95rem; }
.mastery-head span:first-child { display: inline-flex; align-items: center; gap: 8px; }
.mastery-head span:last-child { color: var(--ink-2); font-weight: 500; }
.weak { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.weak li { border: 1px solid var(--line); border-left: 4px solid var(--subj, var(--line)); border-radius: var(--radius-sm); padding: 12px 14px; }
.weak-def { color: var(--ink-2); margin-top: 2px; overflow-wrap: anywhere; }
.weak-meta { display: flex; align-items: center; gap: 6px; font-size: .82rem; color: var(--ink-3); margin-top: 6px; }

/* Card row tools (reorder, delete) */
.card-row { grid-template-columns: 32px 1fr 1fr auto; }
.row-tools { display: flex; gap: 2px; margin-top: 26px; }
.row-tools .icon-btn { margin-top: 0; }
.icon-btn.move { font-size: 1.1rem; }
.icon-btn.move:hover { background: var(--surface-2); color: var(--ink); }
@media (max-width: 640px) {
  .card-row { grid-template-columns: 1fr auto; }
  .row-tools { grid-column: 2; grid-row: 1; margin-top: -8px; }
}
.order-check { margin-top: 14px; align-items: flex-start; }
.order-check input { margin-top: 2px; flex: none; }

/* Steps */
.steps-intro { color: var(--ink-2); margin-bottom: 16px; }
.steps-heading { font-size: 1rem; margin: 18px 0 10px; }
.steps-board { background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); padding: 4px 16px 16px; }
.steps-empty { color: var(--ink-3); padding: 8px 0; }
.steps-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.steps-list.placed { counter-reset: step calc(var(--start, 1) - 1); }
.steps-list.placed li { display: flex; align-items: center; gap: 10px; }
.steps-list.placed li::before { counter-increment: step; content: counter(step); font-family: var(--font-display); font-weight: 800; color: var(--ink-3); min-width: 1.6em; text-align: right; }
.step { flex: 1; width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 10px; text-align: left; padding: 12px 14px; min-height: 52px; border-radius: var(--radius-sm); border: 1.5px solid var(--line); background: var(--surface); cursor: pointer; font-size: .98rem; line-height: 1.4; }
.step:hover:not(:disabled) { border-color: var(--pop); }
.pool .step { background: var(--surface-2); }
.step.is-right { border-color: var(--know); background: var(--know-soft); }
.step.is-wrong { border-color: var(--learn); background: var(--learn-soft); }
.step:disabled { cursor: default; }
.step-mark { font-weight: 800; }
.step.is-right .step-mark { color: var(--know); }
.step.is-wrong .step-mark { color: var(--learn); }
.step-text { overflow-wrap: anywhere; }
.steps-result { margin-top: 20px; }
.correct-order { margin: 0; padding-left: 28px; display: grid; gap: 10px; }
.correct-order li::marker { font-family: var(--font-display); font-weight: 800; color: var(--ink-3); }

/* Cards from notes */
.loader.small { margin: 8px 0 4px; }
.loader.small span { width: 12px; height: 16px; }
.notes-found { font-weight: 600; color: var(--ink) !important; }
.suggestions { list-style: none; margin: 0 0 4px; padding: 0; display: grid; gap: 8px; max-height: 420px; overflow-y: auto; }
.suggestion { display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); cursor: pointer; }
.suggestion input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--pop); flex: none; }
.suggestion > span { display: grid; gap: 2px; overflow-wrap: anywhere; }
.suggestion > span span { color: var(--ink-2); font-size: .92rem; }
.import-bar .btn .spark { margin-right: 2px; }

/* Sync */
.sync-status { font-weight: 600; }
.sync-status.good { color: var(--know) !important; }
.sync-status.bad { color: var(--learn) !important; }
.sync-connect summary { cursor: pointer; font-weight: 600; color: var(--ink-2); padding: 4px 0; }
.sync-connect form { margin-top: 10px; }
.sync-key-input { flex: 1; min-width: 220px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.sync-key-box { border: 1.5px solid var(--pop); background: var(--pop-soft); border-radius: var(--radius-sm); padding: 14px 16px; display: grid; gap: 8px; }
.sync-key { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.15rem; font-weight: 700; letter-spacing: .04em; color: var(--ink) !important; overflow-wrap: anywhere; user-select: all; }

/* Compact toolbar icons (flashcards) */
.tool-icons { display: flex; gap: 6px; margin-left: auto; }
.tool-btn { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.tool-btn svg { width: 20px; height: 20px; }
.tool-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.tool-btn[aria-pressed="true"] { color: var(--pop-ink); border-color: var(--pop); background: var(--pop-soft); }
.danger-zone { margin-top: 28px; text-align: center; }
.head-actions .btn { min-width: 44px; }

/* Test dates */
.exam-field { margin-top: 18px; display: grid; gap: 6px; }
.exam-input { max-width: 220px; }
.exam-badge { display: inline-flex; align-self: flex-start; margin-top: 6px; padding: 2px 10px; border-radius: 999px; background: var(--sun); color: #3a2a00; font-size: .8rem; font-weight: 700; }
.exam-banner { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 12px 14px; border-radius: var(--radius-sm); background: var(--surface); border: 1.5px solid var(--sun); }
.exam-banner p { flex: 1; min-width: 180px; }
.exam-banner .btn { min-height: 40px; }

/* Hints */
.hint-slot { grid-column: 2 / 4; }
@media (max-width: 640px) { .hint-slot { grid-column: 1 / -1; } }
.add-hint { padding-left: 0; text-decoration: none; color: var(--ink-3); font-size: .85rem; }
.add-hint:hover { color: var(--ink); }
.hint-field textarea { min-height: 40px; }
.hint-box { text-align: center; margin-top: 12px; }
.hint-box .text-btn { text-decoration: none; color: var(--ink-2); }
.hint-text { margin: 6px auto 0; max-width: 44ch; padding: 10px 14px; border-radius: var(--radius-sm); background: var(--sun); color: #3a2a00; font-weight: 600; overflow-wrap: anywhere; }

/* Help and first-run tip */
.help-section h2 { font-size: 1.15rem; }
.help-list { margin: 0; padding-left: 20px; display: grid; gap: 8px; color: var(--ink-2); }
.help-list strong { color: var(--ink); }
.help-section p { color: var(--ink-2); }
.help-section p strong, .help-section .steps strong { color: var(--ink); }
.intro-tip { border: 1.5px solid var(--sun); background: var(--surface); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px; display: grid; gap: 12px; }
.intro-tip h2 { font-size: 1.15rem; }

/* Search */
.search-bar { margin-bottom: 16px; }
.search-input { padding-left: 40px; background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='11' cy='11' r='7' fill='none' stroke='%238b8794' stroke-width='2'/%3E%3Cpath d='m20 20-3.5-3.5' stroke='%238b8794' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") 12px center/18px no-repeat; }
.search-count { color: var(--ink-2); margin-bottom: 10px; }
.search-hits { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 8px; }
.search-hits a { display: grid; gap: 2px; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--line); border-left: 4px solid var(--subj, var(--line)); background: var(--surface); text-decoration: none; overflow-wrap: anywhere; }
.search-hits a:hover { border-color: var(--ink-3); }
.search-hits span { color: var(--ink-2); }
.search-hits small { display: flex; align-items: center; gap: 6px; color: var(--ink-3); font-size: .82rem; margin-top: 4px; }

/* Pictures on cards */
.hint-slot { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: flex-start; }
.hint-slot .hint-field { flex: 1 1 100%; }
.add-pic { cursor: pointer; }
.add-pic:focus-within { outline: 3px solid var(--focus); outline-offset: 2px; }
.pic-preview { flex: 1 1 100%; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 6px; }
.pic-preview .card-img, .pic-preview .card-img-slot { width: 96px; height: 72px; object-fit: cover; border-radius: 10px; border: 1px solid var(--line); background: var(--surface-2); display: block; }
.pic-tools { display: flex; gap: 8px 14px; align-items: center; flex-wrap: wrap; }
.card-img { display: block; max-width: 100%; max-height: 200px; border-radius: 12px; object-fit: contain; margin: 0 auto; }
.card-img-slot { display: block; min-height: 40px; }
.image-missing { display: inline-block; font-size: .82rem; color: var(--ink-3); padding: 6px 10px; border: 1px dashed var(--line); border-radius: 8px; }
.face .card-img { max-height: min(200px, 26vh); }
.q-card .card-img { max-height: 220px; margin-bottom: 14px; }

/* Match */
.match-bar { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.match-help { color: var(--ink-2); }
.match-time { font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; font-variant-numeric: tabular-nums; }
.match-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (min-width: 720px) { .match-grid { grid-template-columns: repeat(4, 1fr); } }
.match-tile { min-height: 96px; padding: 12px; border-radius: var(--radius-sm); border: 1.5px solid var(--line); background: var(--surface); font-size: .95rem; line-height: 1.35; cursor: pointer; overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 6; -webkit-box-orient: vertical; overflow: hidden; transition: border-color .15s, background-color .15s, transform .1s; }
.match-tile.term { font-weight: 700; }
.match-tile.definition { color: var(--ink-2); }
.match-tile:hover { border-color: var(--ink-3); }
.match-tile.selected { border-color: var(--pop); background: var(--pop-soft); color: var(--ink); }
.match-tile.wrong { border-color: var(--learn); background: var(--learn-soft); animation: shake .3s; }
.match-tile.gone { visibility: hidden; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
@media (prefers-reduced-motion: reduce) { .match-tile.wrong { animation: none; } }

/* Accessibility: keep focused elements clear of the sticky header and tab bar,
   and show pressed/selected states with more than color. */
html { scroll-padding: 80px 0 110px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
h1[tabindex="-1"]:focus { outline: none; }
.seg button[aria-pressed="true"] { box-shadow: inset 0 0 0 2px var(--ink), var(--shadow); font-weight: 800; }
.tab-bar a[aria-current="page"]::before { content: ""; position: absolute; top: 0; left: 30%; right: 30%; height: 3px; border-radius: 0 0 3px 3px; background: var(--pop-ink); }
.site-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--ink); }
.chip-radio input:checked + span { box-shadow: inset 0 0 0 1.5px var(--subj); font-weight: 800; }
.chip-radio input:checked + span::after { content: "✓"; margin-left: 2px; }
.back { display: inline-flex; align-items: center; min-height: 44px; margin-bottom: 0; }
.text-btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.big { font-size: clamp(3rem, 9vw, 4.5rem); }
.option .opt-mark { margin-left: auto; font-weight: 800; padding-left: 8px; }
.option.is-correct .opt-mark { color: var(--know); }
.option.is-wrong .opt-mark { color: var(--learn); }
.q-card:focus { outline: 3px solid var(--focus); outline-offset: 2px; }
@media (max-width: 719px) { .match-tile { min-height: 64px; padding: 8px 10px; font-size: .86rem; -webkit-line-clamp: 5; } .match-grid { gap: 8px; } }
.undo-row { text-align: center; margin-top: 4px; }
.undo-row .text-btn { color: var(--ink-2); text-decoration: none; }
.pic-alt { flex: 1 1 100%; }

/* Explain this card */
.explain { text-align: center; margin-top: 4px; }
.explain-btn { text-decoration: none; color: var(--ink-2); }
.explain-box { text-align: left; margin: 8px auto 0; max-width: 60ch; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--surface); border: 1.5px solid var(--line); display: grid; gap: 8px; }
.explain-box p { color: var(--ink); }
.explain-issue { background: var(--learn-soft); border-radius: 8px; padding: 8px 10px; }
.write-feedback .explain { text-align: left; }