/* ---------------------------------------------------------------- tokens */
:root {
  --bg: #f6f6f4;
  --surface: #ffffff;
  --surface-2: #f2f2ef;
  --border: #e6e4df;
  --border-strong: #d5d2cb;
  --text: #1a1916;
  --text-2: #57534e;
  --muted: #8a857d;
  --primary: #3651d4;
  --primary-hover: #2c45bd;
  --primary-soft: #eef1fd;
  --on-primary: #ffffff;
  --on-solid: #ffffff;           /* icons on solid ok/bad fills */
  --ok: #15803d;
  --ok-soft: #ecfdf3;
  --ok-border: #86d9a6;
  --bad: #c2312b;
  --bad-soft: #fff1f0;
  --bad-border: #f2a8a3;
  --warn: #c27c0e;
  --ring: rgba(54, 81, 212, 0.35);
  --scrim: rgba(0, 0, 0, 0.35);
  --orig-bg: #ffffff;
  --canvas-filter: none;
  --shadow-sm: 0 1px 2px rgba(26, 25, 22, 0.06);
  --shadow: 0 1px 2px rgba(26, 25, 22, 0.05), 0 4px 16px rgba(26, 25, 22, 0.06);
  --shadow-lg: 0 10px 40px rgba(26, 25, 22, 0.14);
  --radius: 12px;
  --radius-sm: 8px;
  --font-ui: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-read: "Source Serif 4", "Iowan Old Style", "Charter", Georgia, serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;
  --topbar-h: 60px;
  --sidebar-w: 312px;
  color-scheme: light;
}

/* dark: the viewer's system setting, unless they picked light; and an explicit dark choice */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0d0f;
    --surface: #151518;
    --surface-2: #1c1c20;
    --border: #29292e;
    --border-strong: #3a3a41;
    --text: #f2f2f3;
    --text-2: #c4c4c9;
    --muted: #8d8d96;
    --primary: #8098ff;
    --primary-hover: #97aaff;
    --primary-soft: #1d2340;
    --on-primary: #0d0d0f;
    --on-solid: #0d0d0f;
    --ok: #4ade80;
    --ok-soft: #0f2419;
    --ok-border: #22633b;
    --bad: #f87171;
    --bad-soft: #2a1414;
    --bad-border: #7a2c2c;
    --warn: #fbbf24;
    --ring: rgba(128, 152, 255, 0.45);
    --scrim: rgba(0, 0, 0, 0.55);
    --orig-bg: #1a1a1d;
    --canvas-filter: invert(.92) hue-rotate(180deg);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 50px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0d0d0f;
  --surface: #151518;
  --surface-2: #1c1c20;
  --border: #29292e;
  --border-strong: #3a3a41;
  --text: #f2f2f3;
  --text-2: #c4c4c9;
  --muted: #8d8d96;
  --primary: #8098ff;
  --primary-hover: #97aaff;
  --primary-soft: #1d2340;
  --on-primary: #0d0d0f;
  --on-solid: #0d0d0f;
  --ok: #4ade80;
  --ok-soft: #0f2419;
  --ok-border: #22633b;
  --bad: #f87171;
  --bad-soft: #2a1414;
  --bad-border: #7a2c2c;
  --warn: #fbbf24;
  --ring: rgba(128, 152, 255, 0.45);
  --scrim: rgba(0, 0, 0, 0.55);
  --orig-bg: #1a1a1d;
  --canvas-filter: invert(.92) hue-rotate(180deg);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 50px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ---------------------------------------------------------------- base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font-ui);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv11", "ss01";
}
button { font: inherit; color: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
.icon { width: 18px; height: 18px; flex: none; }
.icon-sm { width: 15px; height: 15px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 38px; padding: 0 14px;
  border-radius: 10px; border: 1px solid transparent;
  font-weight: 500; font-size: 14px; cursor: pointer; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s, transform .05s;
  user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--primary); color: var(--on-primary); box-shadow: var(--shadow-sm); }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-outline { background: var(--surface); border-color: var(--border); box-shadow: var(--shadow-sm); }
.btn-outline:hover:not(:disabled) { background: var(--surface-2); border-color: var(--border-strong); }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--text); }
.btn-sm { height: 32px; padding: 0 10px; font-size: 13px; border-radius: 8px; }
.btn-lg { height: 44px; padding: 0 20px; font-size: 15px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px;
  border-radius: 10px; border: 1px solid transparent; background: transparent; color: var(--text-2);
  cursor: pointer; transition: background .15s, color .15s;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn[aria-pressed="true"] { color: var(--warn); }
kbd {
  font: 500 11px/1 var(--font-mono); padding: 3px 5px; border-radius: 5px;
  border: 1px solid var(--border); border-bottom-width: 2px; background: var(--surface); color: var(--text-2);
}

/* ---------------------------------------------------------------- badges */
.badge {
  display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 9px;
  border-radius: 999px; font-size: 12px; font-weight: 500; white-space: nowrap;
  background: var(--surface-2); color: var(--text-2); border: 1px solid var(--border);
}
.badge-skill { background: color-mix(in srgb, var(--c) 10%, var(--surface)); border-color: color-mix(in srgb, var(--c) 28%, var(--surface)); color: color-mix(in srgb, var(--c) 75%, var(--text)); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c, var(--muted)); flex: none; }
.diff { display: inline-flex; gap: 2px; align-items: center; }
.diff i { width: 4px; height: 10px; border-radius: 2px; background: var(--border-strong); }
.diff i.on { background: var(--text-2); }
.mono { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }

/* ---------------------------------------------------------------- landing / import */
.landing { min-height: 100vh; display: grid; place-items: center; padding: 48px 16px; }
.landing-card { width: min(720px, 100%); }
.landing-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; margin-bottom: 28px; }
.logo {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--primary), #7c5cff); color: #fff; box-shadow: var(--shadow-sm);
}
.logo svg { width: 18px; height: 18px; }
.landing h1 { font-size: clamp(28px, 4.4vw, 40px); line-height: 1.12; letter-spacing: -0.025em; margin: 0 0 14px; }
.landing .lead { font-size: 17px; color: var(--text-2); margin: 0 0 28px; max-width: 600px; }
.dropzone {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  padding: 40px 24px; border-radius: 16px; text-align: center; cursor: pointer;
  border: 1.5px dashed var(--border-strong); background: var(--surface); box-shadow: var(--shadow);
  transition: border-color .15s, background .15s, transform .15s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 4%, var(--surface)); }
.dropzone.drag { transform: scale(1.01); }
.dz-icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); }
.dz-icon svg { width: 24px; height: 24px; }
.dz-title { font-weight: 600; font-size: 16px; }
.dz-sub { color: var(--muted); font-size: 13.5px; }
.dropzone input { display: none; }
.steps { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.steps li { padding: 14px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); font-size: 13.5px; color: var(--text-2); }
.steps .n { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--surface-2); color: var(--text); font-weight: 600; font-size: 12px; margin-bottom: 8px; }
.steps b { color: var(--text); font-weight: 600; }
.privacy { display: flex; gap: 10px; align-items: flex-start; margin-top: 18px; color: var(--muted); font-size: 13px; }
.privacy svg { margin-top: 1px; color: var(--ok); }
.alert { display: flex; gap: 10px; padding: 12px 14px; border-radius: 10px; margin-top: 16px; font-size: 14px; border: 1px solid var(--bad-border); background: var(--bad-soft); color: var(--text); }
.alert svg { color: var(--bad); margin-top: 2px; }
.alert.note { border-color: var(--ok-border); background: var(--ok-soft); }
.alert.note svg { color: var(--ok); }
.landing-alt { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; margin-top: 14px; font-size: 13px; }
.landing-alt .btn { border: 1px solid var(--border); margin-left: -2px; cursor: pointer; }
.import-progress { margin-top: 6px; width: min(360px, 90%); }
.bar { height: 6px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--primary); border-radius: inherit; transition: width .2s; }
.landing-foot { margin-top: 36px; font-size: 12px; color: var(--muted); }

/* ---------------------------------------------------------------- topbar */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 30; height: var(--topbar-h);
  display: flex; align-items: center; gap: 12px; padding: 0 16px 0 20px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; white-space: nowrap; }
.set-title { display: flex; align-items: baseline; gap: 8px; min-width: 0; padding-left: 14px; margin-left: 4px; border-left: 1px solid var(--border); }
.set-name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.set-sub { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.spacer { flex: 1; }
.score { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-2); white-space: nowrap; }
.score b { color: var(--text); font-weight: 600; }
.ring {
  --p: 0; width: 30px; height: 30px; border-radius: 50%; flex: none;
  background: conic-gradient(var(--ok) calc(var(--ok-p, 0) * 1turn), var(--bad) 0 calc(var(--p) * 1turn), var(--surface-2) 0);
  display: grid; place-items: center;
}
.ring::after { content: ""; width: 22px; height: 22px; border-radius: 50%; background: var(--bg); }
.menu-wrap { position: relative; }
.menu {
  position: absolute; right: 0; top: calc(100% + 6px); min-width: 240px; padding: 6px; z-index: 50;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-lg);
}
.menu button {
  width: 100%; display: flex; align-items: center; gap: 10px; padding: 9px 10px; border: 0; border-radius: 8px;
  background: transparent; text-align: left; cursor: pointer; font-size: 14px; color: var(--text);
}
.menu button:hover { background: var(--surface-2); }
.menu button.danger { color: var(--bad); }
.menu hr { border: 0; border-top: 1px solid var(--border); margin: 6px 4px; }
.menu-note { display: flex; align-items: center; gap: 8px; padding: 8px 10px 4px; font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.menu-note svg { color: var(--ok); flex: none; }
.sync-chip { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); white-space: nowrap; }
.sync-chip.saved svg { color: var(--ok); }
.sync-chip.offline, .sync-chip.error { color: var(--bad); }
.sync-chip.saving svg { animation: sync-pulse 1.2s ease-in-out infinite; }
@keyframes sync-pulse { 50% { opacity: .35; } }
@media (max-width: 760px) { .sync-chip .label { display: none; } }

/* ---------------------------------------------------------------- layout */
.layout { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr); min-height: calc(100vh - var(--topbar-h)); }
.sidebar {
  position: sticky; top: calc(var(--topbar-h) + env(safe-area-inset-top, 0px)); height: calc(100vh - var(--topbar-h)); overflow-y: auto;
  border-right: 1px solid var(--border); padding: 18px 16px 24px; display: flex; flex-direction: column; gap: 22px;
  scrollbar-width: thin;
}
.side-label { font-size: 11.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; display: flex; justify-content: space-between; }
.skill-list { display: flex; flex-direction: column; gap: 2px; }
.skill-item {
  display: flex; align-items: center; gap: 10px; width: 100%; padding: 8px 10px; border-radius: 9px; border: 0;
  background: transparent; cursor: pointer; text-align: left; font-size: 14px; color: var(--text-2);
}
.skill-item:hover { background: var(--surface-2); color: var(--text); }
.skill-domain { font-size: 11.5px; font-weight: 600; color: var(--muted); padding: 10px 10px 4px; }
.skill-item.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm), inset 0 0 0 1px var(--border); font-weight: 500; }
.skill-item .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.skill-item .count { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  height: 30px; padding: 0 11px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface);
  font-size: 13px; cursor: pointer; color: var(--text-2); display: inline-flex; align-items: center; gap: 6px;
}
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip.active { background: var(--text); border-color: var(--text); color: var(--bg); }
.chip .count { font-size: 11.5px; opacity: .7; font-variant-numeric: tabular-nums; }
.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 6px; }
.qcell {
  position: relative; height: 36px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface);
  font-size: 12.5px; font-weight: 500; cursor: pointer; color: var(--text-2); font-variant-numeric: tabular-nums;
  transition: transform .1s, border-color .15s;
}
.qcell:hover { border-color: var(--border-strong); color: var(--text); }
.qcell::before { content: ""; position: absolute; left: 6px; right: 6px; bottom: 4px; height: 2px; border-radius: 2px; background: var(--c); opacity: .55; }
.qcell.ok { background: var(--ok-soft); border-color: var(--ok-border); color: var(--ok); }
.qcell.bad { background: var(--bad-soft); border-color: var(--bad-border); color: var(--bad); }
.qcell.current { outline: 2px solid var(--primary); outline-offset: 1px; color: var(--text); }
.qcell.flag::after { content: ""; position: absolute; top: 3px; right: 3px; width: 6px; height: 6px; border-radius: 50%; background: var(--warn); }
.stat-rows { display: flex; flex-direction: column; gap: 12px; }
.stat-row .top { display: flex; align-items: center; gap: 8px; font-size: 13px; margin-bottom: 6px; color: var(--text-2); }
.stat-row .top .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.stat-row .top .num { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 12px; }
.split-bar { display: flex; height: 6px; border-radius: 99px; overflow: hidden; background: var(--surface-2); }
.split-bar .ok { background: var(--ok); }
.split-bar .bad { background: var(--bad); }
.side-foot { margin-top: auto; font-size: 12px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; }

/* ---------------------------------------------------------------- question */
.main { padding: 28px 32px 120px; }
.qwrap { max-width: 760px; margin: 0 auto; }
.qhead { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.qnum { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.qnum span { color: var(--muted); font-weight: 400; }
.qhead .spacer { flex: 1; }
.qtools { display: flex; gap: 4px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); }
.passage { padding: 28px 32px; font: 19px/1.7 var(--font-read); color: var(--text); }
.passage p { margin: 0 0 1em; }
.passage p:last-child { margin-bottom: 0; }
.passage p.intro { font-size: 16px; color: var(--text-2); font-style: italic; }
.verse { margin: 0 0 1em; padding: 2px 0 2px 20px; border-left: 3px solid var(--border); }
.verse:last-child { margin-bottom: 0; }
.verse p { margin: 0 0 .2em; }
.verse p.stanza { margin-top: .9em; }
.passage u { text-decoration-thickness: 1.5px; text-underline-offset: 4px; text-decoration-color: color-mix(in srgb, var(--primary) 70%, var(--text)); background: color-mix(in srgb, var(--primary) 7%, transparent); }
.passage sub, .passage sup, .rat sub, .rat sup, .choice sub, .choice sup { font-size: .7em; line-height: 0; }
.text-label {
  display: inline-flex; font: 600 12px/1 var(--font-ui); letter-spacing: .06em; text-transform: uppercase;
  color: var(--primary); background: var(--primary-soft); padding: 6px 9px; border-radius: 6px; margin: 4px 0 10px;
}
.text-label:not(:first-child) { margin-top: 18px; }
.blank { display: inline-block; width: 3.2em; height: 1em; vertical-align: -0.15em; border-bottom: 2px solid currentColor; margin: 0 .15em; opacity: .75; }
.prompt { font: 600 17px/1.5 var(--font-ui); margin: 26px 2px 14px; letter-spacing: -0.005em; }
.orig { padding: 14px; background: var(--orig-bg); border-radius: 16px; border: 1px solid var(--border); }
.orig canvas { display: block; }
.orig canvas { filter: var(--canvas-filter); }
.orig-note { font-size: 12.5px; color: var(--muted); margin: 8px 2px 0; display: flex; gap: 6px; align-items: center; }

.choices { display: flex; flex-direction: column; gap: 10px; }
.choice-row { display: flex; gap: 8px; align-items: stretch; }
.choice {
  flex: 1; display: flex; align-items: flex-start; gap: 14px; text-align: left; cursor: pointer;
  padding: 14px 16px; border-radius: 14px; border: 1.5px solid var(--border); background: var(--surface);
  font: 17px/1.55 var(--font-read); color: var(--text); box-shadow: var(--shadow-sm);
  transition: border-color .15s, background .15s, box-shadow .15s, transform .08s, opacity .2s;
}
.choice:hover:not(:disabled) { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.choice:active:not(:disabled) { transform: scale(.995); }
.choice:disabled { cursor: default; }
.choice .letter {
  flex: none; width: 30px; height: 30px; margin-top: -1px; border-radius: 50%; display: grid; place-items: center;
  font: 600 14px/1 var(--font-ui); border: 1.5px solid var(--border-strong); color: var(--text-2); background: var(--surface);
  transition: all .15s;
}
.choice .ctext { flex: 1; padding-top: 1px; }
.choice .cicon { flex: none; width: 24px; height: 24px; margin-top: 2px; display: grid; place-items: center; border-radius: 50%; }
.choice.struck .ctext { text-decoration: line-through; text-decoration-thickness: 1.5px; color: var(--muted); }
.choice.struck .letter { opacity: .5; }
.choice.correct { border-color: var(--ok); background: var(--ok-soft); }
.choice.correct .letter { background: var(--ok); border-color: var(--ok); color: var(--surface); }
.choice.correct .cicon { color: var(--ok); }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.choice.wrong .letter { background: var(--bad); border-color: var(--bad); color: var(--surface); }
.choice.wrong .cicon { color: var(--bad); }
.choice.dim { opacity: .55; box-shadow: none; }
.choice.pop { animation: pop .35s ease; }
@keyframes pop { 0% { transform: scale(1); } 40% { transform: scale(1.012); } 100% { transform: scale(1); } }
.choice.shake { animation: shake .35s ease; }
@keyframes shake { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }
.strike {
  flex: none; width: 40px; border-radius: 12px; border: 1px solid transparent; background: transparent; color: var(--muted);
  cursor: pointer; display: grid; place-items: center; transition: background .15s, color .15s;
}
.strike:hover { background: var(--surface-2); color: var(--text); }
.strike.on { color: var(--bad); }
.strike svg { width: 20px; height: 20px; }
.compact-choices { flex-direction: row; flex-wrap: wrap; margin-top: 14px; }
.compact-choices .choice-row { flex: 0 0 auto; }
.compact-choices .choice { flex: 0 0 auto; padding: 10px 12px; gap: 8px; align-items: center; }
.compact-choices .ctext { display: none; }
.compact-choices .cicon:empty { display: none; }

.feedback {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px; margin-top: 16px; border-radius: 14px;
  border: 1px solid; animation: fadein .25s ease;
}
.feedback.ok { background: var(--ok-soft); border-color: var(--ok-border); }
.feedback.bad { background: var(--bad-soft); border-color: var(--bad-border); }
.feedback .fic { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; flex: none; color: var(--on-solid); }
.feedback.ok .fic { background: var(--ok); }
.feedback.bad .fic { background: var(--bad); }
.feedback .ftext { flex: 1; font-size: 14.5px; color: var(--text-2); }
.feedback .ftext strong { display: block; font-size: 15.5px; color: var(--text); }
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.explain { margin-top: 16px; overflow: hidden; }
.explain-head {
  width: 100%; display: flex; align-items: center; gap: 10px; padding: 16px 20px; border: 0; background: transparent;
  cursor: pointer; font-weight: 600; font-size: 15px; text-align: left;
}
.explain-head .chev { margin-left: auto; transition: transform .2s; color: var(--muted); }
.explain.open .explain-head .chev { transform: rotate(180deg); }
.explain-head .hint { font-weight: 400; color: var(--muted); font-size: 13px; }
.explain-body { padding: 0 20px 20px; display: flex; flex-direction: column; gap: 12px; }
.rat { display: flex; gap: 12px; font: 16px/1.65 var(--font-read); color: var(--text-2); }
.rat p { margin: 0; }
.rat.best { color: var(--text); }
.rat .rat-badges { display: flex; flex-direction: column; gap: 4px; padding-top: 2px; }
.rat-badge {
  width: 24px; height: 24px; border-radius: 7px; display: grid; place-items: center; flex: none;
  font: 600 12px/1 var(--font-ui); background: var(--surface-2); color: var(--text-2); border: 1px solid var(--border);
}
.rat.best .rat-badge { background: var(--ok); color: var(--surface); border-color: var(--ok); }
.rat.plain { padding-left: 36px; }
.locked { padding: 0 20px 18px; color: var(--muted); font-size: 14px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.qnav { display: flex; align-items: center; gap: 10px; margin-top: 24px; }
.qnav .spacer { flex: 1; }
.hints { margin-top: 18px; display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--muted); justify-content: center; }
.hints span { display: inline-flex; gap: 6px; align-items: center; }
.empty { text-align: center; padding: 80px 20px; color: var(--muted); }
.empty h3 { color: var(--text); margin: 0 0 6px; }

/* ---------------------------------------------------------------- tabs */
.tabs { display: flex; gap: 2px; padding: 3px; margin-left: 12px; border-radius: 11px; background: var(--surface-2); border: 1px solid var(--border); }
.tab {
  display: inline-flex; align-items: center; gap: 7px; height: 30px; padding: 0 12px; border: 0; border-radius: 8px;
  background: transparent; color: var(--text-2); font-size: 13.5px; font-weight: 500; cursor: pointer; white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }
.tab-badge {
  min-width: 20px; height: 18px; padding: 0 6px; border-radius: 99px; display: inline-grid; place-items: center;
  background: var(--primary); color: var(--on-primary); font-size: 11px; font-weight: 600; font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------- vocabulary */
.vseg { display: none; gap: 2px; padding: 3px; margin: 0 auto 16px; max-width: 680px; border-radius: 11px; background: var(--surface-2); border: 1px solid var(--border); }
.vseg button { flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 7px; height: 34px; border: 0; border-radius: 8px; background: transparent; color: var(--text-2); font-size: 14px; font-weight: 500; cursor: pointer; }
.vseg button.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }
.vwrap { max-width: 680px; margin: 0 auto; }
.vwrap.wide { max-width: 860px; }
.vtoday { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.vtoday > div { padding: 12px; border-radius: 12px; background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.vtoday b { display: block; font-size: 24px; line-height: 1.1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.vtoday span { font-size: 12.5px; color: var(--muted); }
.vstart { width: 100%; margin-top: 10px; }
.ex-later { display: flex; gap: 8px; align-items: flex-start; margin: 16px 0 0; font-size: 13px; color: var(--muted); }
.ex-later .icon { margin-top: 2px; flex: none; }
.stack-bar { display: flex; height: 8px; border-radius: 99px; overflow: hidden; background: var(--surface-2); }
.stack-bar .m, .legend i.m { background: var(--ok); }
.stack-bar .k, .legend i.k { background: color-mix(in srgb, var(--ok) 45%, var(--surface-2)); }
.stack-bar .l, .legend i.l { background: var(--primary); }
.legend { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; margin-top: 10px; font-size: 12.5px; color: var(--text-2); }
.legend span { display: flex; align-items: center; gap: 6px; }
.legend i { width: 8px; height: 8px; border-radius: 2px; background: var(--border-strong); }

.sess-top { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; font-size: 13px; color: var(--muted); }
.sess-top .bar { flex: 1; }
.sess-top b { color: var(--text); font-variant-numeric: tabular-nums; }
.flash { padding: 26px 30px 28px; text-align: left; }
.flash-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.flash-meta .spacer { flex: 1; }
.flash-term { font: 600 clamp(32px, 6vw, 44px)/1.15 var(--font-read); letter-spacing: -0.01em; margin-bottom: 14px; overflow-wrap: anywhere; }
.flash-hint { color: var(--muted); margin: 0 0 22px; }
.flash-def { font: 19px/1.55 var(--font-read); color: var(--text); }
.flash-def.muted, .muted { color: var(--muted); }
.def-src { font-size: 12px; color: var(--muted); margin-top: 4px; }
.examples { display: flex; flex-direction: column; gap: 10px; margin: 18px 0; }
.ex { margin: 0; padding: 12px 14px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); }
.ex blockquote { margin: 0; font: 16px/1.6 var(--font-read); color: var(--text-2); }
.ex mark { background: color-mix(in srgb, var(--warn) 22%, transparent); color: var(--text); padding: 0 2px; border-radius: 3px; font-weight: 600; }
.ex figcaption { margin-top: 6px; font-size: 12px; color: var(--muted); }
.linkish { border: 0; padding: 0; background: none; color: var(--primary); cursor: pointer; font-size: inherit; }
.linkish:hover { text-decoration: underline; }
.field { display: flex; flex-direction: column; gap: 6px; margin-top: 14px; font-size: 12.5px; color: var(--muted); }
.field small { font-size: 12px; }
.field input {
  height: 40px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface);
  color: var(--text); font: 15px var(--font-ui); outline: none; transition: border-color .15s, box-shadow .15s;
}
.field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 14px; }
.grade {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 12px 8px; border-radius: 14px;
  border: 1.5px solid var(--border); background: var(--surface); cursor: pointer; box-shadow: var(--shadow-sm); font-weight: 600; font-size: 14.5px;
  transition: transform .08s, border-color .15s, background .15s;
}
.grade small { font-weight: 400; font-size: 12px; color: var(--muted); }
.grade kbd { position: absolute; top: 6px; right: 6px; opacity: .6; }
.grade:active { transform: translateY(1px); }
.grade.g1:hover { border-color: var(--bad); background: var(--bad-soft); }
.grade.g2:hover { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, var(--surface)); }
.grade.g3:hover { border-color: var(--ok); background: var(--ok-soft); }
.grade.g4:hover { border-color: var(--primary); background: var(--primary-soft); }
.grade.g1 span { color: var(--bad); }
.grade.g2 span { color: var(--warn); }
.grade.g3 span { color: var(--ok); }
.grade.g4 span { color: var(--primary); }
.flash-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 16px; }
.flash-foot .hints { margin: 0; }
/* a phone or tablet has no keyboard: key hints would only take space */
@media (hover: none) and (pointer: coarse) {
  kbd, .hints { display: none; }
}
.done-card { padding: 40px 28px; text-align: center; }
.done-card h2 { margin: 14px 0 8px; font-size: 22px; letter-spacing: -0.01em; }
.done-card p { color: var(--text-2); margin: 0 auto 22px; max-width: 420px; }
.done-icon { width: 56px; height: 56px; margin: 0 auto; border-radius: 50%; display: grid; place-items: center; background: var(--ok); color: var(--on-solid); }
.done-icon .icon { width: 28px; height: 28px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; justify-content: inherit; }
.done-card .row { justify-content: center; }

.spill { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: 99px; font-size: 11.5px; font-weight: 500; border: 1px solid var(--border); color: var(--text-2); background: var(--surface-2); }
.spill.s-new { color: var(--primary); background: var(--primary-soft); border-color: transparent; }
.spill.s-learning { color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, var(--surface)); border-color: transparent; }
.spill.s-mastered, .spill.s-known { color: var(--ok); background: var(--ok-soft); border-color: transparent; }
.sdot { width: 8px; height: 8px; border-radius: 50%; flex: none; background: var(--border-strong); }
.sdot.s-new { background: var(--primary); }
.sdot.s-learning { background: var(--warn); }
.sdot.s-mastered { background: var(--ok); }
.sdot.s-known { background: color-mix(in srgb, var(--ok) 45%, var(--surface-2)); }

.list-head { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; }
.search {
  flex: 1; display: flex; align-items: center; gap: 8px; height: 40px; padding: 0 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted); box-shadow: var(--shadow-sm);
}
.search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.search input { flex: 1; min-width: 0; border: 0; outline: none; background: transparent; color: var(--text); font: 15px var(--font-ui); }
.addform { padding: 6px 18px 18px; margin-bottom: 14px; }
.addform .row { margin-top: 14px; }
.wcount { font-size: 12.5px; color: var(--muted); margin: 0 2px 8px; }
.wlist { border: 1px solid var(--border); border-radius: 14px; background: var(--surface); overflow: hidden; box-shadow: var(--shadow-sm); }
.wrow + .wrow { border-top: 1px solid var(--border); }
.wrow-main {
  width: 100%; display: grid; grid-template-columns: 8px minmax(110px, 200px) 1fr auto; align-items: center; gap: 12px;
  padding: 11px 14px; border: 0; background: transparent; text-align: left; cursor: pointer;
}
.wrow-main:hover { background: var(--surface-2); }
.wrow.open .wrow-main { background: var(--surface-2); }
.wterm { font: 600 16px/1.3 var(--font-read); overflow-wrap: anywhere; }
.wdef { font-size: 13.5px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.wnote { color: var(--muted); }
.wwhen { font-size: 12px; color: var(--muted); white-space: nowrap; }
.mine-tag { font: 500 10.5px var(--font-ui); color: var(--primary); background: var(--primary-soft); padding: 1px 6px; border-radius: 99px; vertical-align: 2px; }
.wrow-body { padding: 2px 16px 16px 34px; }
.wrow-body .row { margin-top: 14px; }
.danger-text { color: var(--bad); }
.empty.small { padding: 28px 16px; }

.qwords { margin-top: 16px; padding: 16px 20px 18px; }
.qwords-head { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; margin-bottom: 10px; }
.qwords-head .hint { font-weight: 400; color: var(--muted); font-size: 13px; }
.qwords-head .btn { margin-left: auto; }
.qwords-list { display: flex; flex-direction: column; gap: 8px; }
.qword { display: grid; grid-template-columns: 8px auto 1fr; gap: 10px; align-items: baseline; font-size: 14px; color: var(--text-2); }
.qword .sdot { align-self: center; }
.qword b { font: 600 15.5px var(--font-read); color: var(--text); }

.selpop {
  position: absolute; z-index: 70; display: inline-flex; align-items: center; height: 34px; padding: 0;
  border-radius: 10px; border: 0; background: var(--text); color: var(--bg); font-size: 13.5px; cursor: pointer;
  box-shadow: var(--shadow-lg); animation: fadein .15s ease;
}
.selpop b { font-weight: 600; max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.selpop.exists { background: var(--surface); color: var(--text-2); border: 1px solid var(--border); cursor: default; }

/* ---------------------------------------------------------------- hard words while reading */
.hw { text-decoration: underline dotted color-mix(in srgb, var(--primary) 70%, transparent); text-decoration-thickness: 1.5px; text-underline-offset: 4px; cursor: help; border-radius: 3px; }
.hw:hover, .hw:focus-visible { background: color-mix(in srgb, var(--primary) 10%, transparent); outline: none; }
.side-hint { margin: 8px 0 0; font-size: 12px; color: var(--muted); }
.wordpop {
  position: absolute; z-index: 75; padding: 12px 14px; border-radius: 14px; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); box-shadow: var(--shadow-lg); animation: fadein .15s ease;
}
.wp-head { display: flex; align-items: center; gap: 8px; }
.wp-head b { font: 600 20px var(--font-read); flex: 1; }
.wp-head .icon-btn { width: 28px; height: 28px; }
.wp-def { margin-top: 4px; font-size: 14.5px; line-height: 1.5; color: var(--text-2); }
.wp-actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.pos { font: italic 500 13px var(--font-ui); color: var(--muted); letter-spacing: .01em; }
.flash-def .pos { font-size: 14px; margin-right: 2px; }
.flash-sample { margin: 10px 0 0; font: italic 16px/1.55 var(--font-read); color: var(--text-2); }

/* ---------------------------------------------------------------- words before a question */
.qcell.closed { border-style: dashed; color: var(--muted); background: transparent; }   /* not .locked: that one is the explanation placeholder */
.qcell.closed::before { opacity: .3; }
.prep { padding: 24px 26px 22px; }
.prep-loading { display: flex; gap: 10px; align-items: center; color: var(--muted); }
.prep-head { display: flex; gap: 14px; align-items: flex-start; }
.prep-icon { flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); }
.prep-head h2 { margin: 2px 0 6px; font-size: 20px; letter-spacing: -0.01em; }
.prep-head p { margin: 0; color: var(--text-2); line-height: 1.55; }
.prep-head p .muted { display: block; margin-top: 4px; font-size: 13.5px; }
.prep-list { list-style: none; margin: 20px 0 0; padding: 0; display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
.prep-word { padding: 12px 16px; }
.prep-word + .prep-word { border-top: 1px solid var(--border); }
.pw-top { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.pw-top b { font: 600 19px var(--font-read); }
.pw-def { margin-top: 2px; font: 16px/1.5 var(--font-read); color: var(--text); }
.pw-ex { margin: 4px 0 0; font: italic 15px/1.5 var(--font-read); color: var(--muted); }
.prep-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.prep-actions.small { justify-content: space-between; font-size: 13px; }
.prep-actions .btn-lg kbd { margin-left: 4px; opacity: .7; }
.quiz-term { font: 600 clamp(30px, 5.5vw, 40px)/1.15 var(--font-read); letter-spacing: -0.01em; overflow-wrap: anywhere; }
.quiz-term .pos { font-size: 15px; }
.quiz-ask { margin: 6px 0 16px; color: var(--muted); }
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-opt {
  display: flex; align-items: flex-start; gap: 12px; text-align: left; cursor: pointer; padding: 12px 14px; border-radius: 12px;
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text); font: 16px/1.5 var(--font-read);
  box-shadow: var(--shadow-sm); transition: border-color .15s, background .15s, box-shadow .15s, opacity .2s;
}
.quiz-opt kbd { flex: none; margin-top: 2px; }
.quiz-opt:hover:not(:disabled) { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.quiz-opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.quiz-opt.dim { opacity: .5; box-shadow: none; }
.quiz-miss { margin-top: 14px; display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.quiz-miss p { margin: 0; }
@media (max-width: 600px) { .prep { padding: 18px 16px; } .prep-head .prep-icon { display: none; } }

/* ---------------------------------------------------------------- daily routine */
.tab-badge.warn { background: var(--warn); color: var(--on-solid); }
.tab-done { display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--ok-soft); color: var(--ok); }
.tab-done .icon { width: 12px; height: 12px; }
.streak-chip {
  display: inline-flex; align-items: center; gap: 5px; height: 32px; padding: 0 10px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted); font-size: 13.5px; font-variant-numeric: tabular-nums;
}
.streak-chip b { font-weight: 700; }
.streak-chip.on { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); background: color-mix(in srgb, var(--warn) 8%, var(--surface)); }
.streak-chip.on.closed .icon { fill: color-mix(in srgb, var(--warn) 35%, transparent); }
.chip-warn:not(.active) { border-color: color-mix(in srgb, var(--warn) 45%, var(--border)); color: var(--warn); }
.chip .icon-sm { width: 13px; height: 13px; }
.qcell.rq { box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--warn) 55%, transparent); }
.qcell.rq::before { background: var(--warn); opacity: .9; }
.qcell.fixed { background: var(--ok-soft); border-color: var(--ok-border); color: var(--ok); }
.review-banner {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px; margin-bottom: 16px; border-radius: 12px; font-size: 14px;
  background: color-mix(in srgb, var(--warn) 9%, var(--surface)); border: 1px solid color-mix(in srgb, var(--warn) 35%, var(--border)); color: var(--text-2);
}
.review-banner .icon { color: var(--warn); }
.fnote { display: flex; align-items: center; gap: 6px; margin-top: 6px; font-size: 13px; color: var(--text-2); }
.fnote .icon { color: var(--warn); }
.fnote.time .icon { color: var(--muted); }
.fnote.time.fast .icon { color: var(--ok); }
.fnote.time.over .icon { color: var(--bad); }
.qtimer {
  display: inline-flex; align-items: center; gap: 5px; height: 24px; padding: 0 9px; border-radius: 999px;
  font: 600 12.5px var(--font-ui); font-variant-numeric: tabular-nums; color: var(--text-2);
  background: var(--surface); border: 1px solid var(--border);
}
.qtimer .icon { color: var(--ok); }
.qtimer.over .icon, .qtimer.over b { color: var(--warn); }
.qtimer.paused { opacity: .55; }
.qtimer.paused .icon { color: var(--muted); }
.upcoming { display: flex; flex-direction: column; gap: 8px; }
.up-row { display: grid; grid-template-columns: 92px 1fr; gap: 8px; align-items: start; font-size: 12.5px; }
.up-when { color: var(--muted); padding-top: 3px; }
.up-nums { display: flex; flex-wrap: wrap; gap: 4px; }
.up-num { min-width: 28px; height: 24px; padding: 0 6px; border-radius: 6px; display: inline-grid; place-items: center; font-size: 12px; font-variant-numeric: tabular-nums;
  background: var(--surface); border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--border)); color: var(--text-2); }
.review-banner b { color: var(--text); }
.review-banner.ok, .review-banner.fixed { background: var(--ok-soft); border-color: var(--ok-border); }
.review-banner.ok .icon, .review-banner.fixed .icon { color: var(--ok); }
.review-banner.bad { background: var(--bad-soft); border-color: var(--bad-border); }
.review-banner.bad .icon { color: var(--bad); }

.today { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.today-hero { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 22px; padding: 22px 24px; }
.today-hero h2 { margin: 0 0 4px; font-size: 22px; letter-spacing: -0.015em; text-wrap: balance; }
.today-hero p { margin: 0; color: var(--text-2); }
.streak-badge {
  width: 92px; height: 92px; border-radius: 22px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); text-align: center;
}
.streak-badge .icon { width: 22px; height: 22px; }
.streak-badge b { font-size: 28px; line-height: 1.1; letter-spacing: -0.02em; color: var(--text); font-variant-numeric: tabular-nums; }
.streak-badge span { font-size: 11px; }
.streak-badge.on { background: color-mix(in srgb, var(--warn) 12%, var(--surface)); border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); color: var(--warn); }
.streak-badge.on .icon { fill: color-mix(in srgb, var(--warn) 30%, transparent); }
.day-ring {
  --p: 0; width: 74px; height: 74px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--ok) calc(var(--p) * 1turn), var(--surface-2) 0);
}
.day-ring span { width: 58px; height: 58px; border-radius: 50%; background: var(--surface); display: grid; place-items: center; font-size: 13px; color: var(--muted); }
.day-ring b { font-size: 20px; color: var(--text); }
.today-hero.is-closed { border-color: var(--ok-border); }
.task-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.task { padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.task-icon { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); }
.task.done .task-icon { background: var(--ok-soft); color: var(--ok); }
.task-body { flex: 1; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.task-title { font-weight: 600; font-size: 15px; }
.task-sub { font-size: 13px; color: var(--text-2); }
.task .bar { margin-top: 4px; }
.task.done .bar > span { background: var(--ok); }
.task .btn { align-self: flex-start; }
.today-block { padding: 18px 20px; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.block-head h3 { margin: 0; font-size: 16px; }
.block-head span { font-size: 13px; color: var(--muted); }
.block-head b { color: var(--text); font-variant-numeric: tabular-nums; }
.hm-wrap { --hm: 13px; overflow-x: auto; padding: 2px; }
.hm-months, .hm-grid { display: grid; column-gap: 3px; justify-content: start; }
.hm-months { font-size: 11px; color: var(--muted); margin-bottom: 4px; height: 14px; white-space: nowrap; }
.hm-grid { grid-template-rows: repeat(7, var(--hm)); row-gap: 3px; }
.hm { display: block; width: var(--hm); height: var(--hm); border-radius: 3px; background: var(--surface-2); border: 1px solid var(--border); }
.hm.l1 { background: color-mix(in srgb, var(--ok) 22%, var(--surface-2)); border-color: transparent; }
.hm.l2 { background: color-mix(in srgb, var(--ok) 45%, var(--surface-2)); border-color: transparent; }
.hm.l3 { background: color-mix(in srgb, var(--ok) 70%, var(--surface-2)); border-color: transparent; }
.hm.l4 { background: var(--ok); border-color: transparent; }
.hm.closed { box-shadow: inset 0 0 0 1.5px var(--warn); }
.hm.today { outline: 1.5px solid var(--text-2); outline-offset: 1px; }
.hm.future { opacity: .35; }
.hm-legend { display: flex; align-items: center; gap: 4px; margin-top: 10px; font-size: 11.5px; color: var(--muted); flex-wrap: wrap; }
.hm-legend .hm { width: 11px; height: 11px; }
.hm-legend span + .hm.closed { margin-left: 12px; }
.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; }
.ach { display: flex; gap: 12px; align-items: center; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); opacity: .62; }
.ach.on { opacity: 1; background: var(--surface); border-color: color-mix(in srgb, var(--warn) 40%, var(--border)); }
.ach-icon { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; flex: none; background: var(--surface); color: var(--muted); border: 1px solid var(--border); }
.ach.on .ach-icon { background: color-mix(in srgb, var(--warn) 14%, var(--surface)); color: var(--warn); border-color: transparent; }
.ach-text { min-width: 0; display: flex; flex-direction: column; }
.ach-text b { font-size: 14px; }
.ach-text span { font-size: 12px; color: var(--muted); }
.setting { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 10px 0; }
.setting + .setting { border-top: 1px solid var(--border); }
.setting > span:first-child { font-size: 14px; }
.setting .muted { font-size: 13px; max-width: 420px; }
.time-input { height: 32px; padding: 0 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: 14px var(--font-ui); }
.ov { display: flex; flex-direction: column; gap: 2px; }
.ov-row { display: grid; grid-template-columns: 1fr auto; column-gap: 8px; align-items: baseline; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: 13.5px; color: var(--text-2); }
.ov-row:last-child { border-bottom: 0; }
.ov-row b { color: var(--text); font-variant-numeric: tabular-nums; }
.ov-row small { grid-column: 1 / -1; font-size: 11.5px; color: var(--muted); }
.celebrate { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 16px; background: var(--scrim); backdrop-filter: blur(3px); animation: fadein .2s ease; }
.celebrate canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.celebrate-card { position: relative; width: min(380px, 100%); padding: 30px 26px 24px; text-align: center; border-radius: 20px; background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-lg); }
.celebrate-card h2 { margin: 14px 0 4px; font-size: 24px; letter-spacing: -0.02em; }
.celebrate-card p { margin: 0 0 18px; color: var(--text-2); }
.celebrate-streak { font-size: 15px; }
.celebrate-streak b { font-size: 34px; color: var(--warn); margin-right: 4px; }
.celebrate-flame { width: 64px; height: 64px; margin: 0 auto; border-radius: 50%; display: grid; place-items: center; color: var(--warn); background: color-mix(in srgb, var(--warn) 14%, var(--surface)); animation: pop .5s ease; }
.celebrate-flame .icon { width: 32px; height: 32px; fill: color-mix(in srgb, var(--warn) 35%, transparent); }
@media (max-width: 960px) {
  .task-list { grid-template-columns: minmax(0, 1fr); }
  .task { flex-direction: row; align-items: center; }
  .task .btn { align-self: center; }
}
@media (max-width: 600px) {
  .today-hero { grid-template-columns: auto 1fr; gap: 14px; padding: 16px; }
  .today-hero .day-ring { display: none; }
  .streak-badge { width: 72px; height: 72px; border-radius: 18px; }
  .streak-badge b { font-size: 22px; }
  .task .task-icon { display: none; }
  .streak-chip { padding: 0 8px; }
}

/* ---------------------------------------------------------------- assistant */
.ai-q.has-thread { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); color: var(--primary); }
.ai-fab {
  position: fixed; right: 20px; bottom: calc(20px + env(safe-area-inset-bottom, 0px)); z-index: 40;
  display: inline-flex; align-items: center; gap: 8px; height: 46px; padding: 0 18px 0 14px; border: 0; border-radius: 999px;
  background: var(--text); color: var(--bg); font-weight: 600; font-size: 14px; cursor: pointer; box-shadow: var(--shadow-lg);
  transition: transform .15s;
}
.ai-fab:hover { transform: translateY(-1px); }
.ai-panel {
  position: fixed; z-index: 45; top: calc(var(--topbar-h) + env(safe-area-inset-top, 0px)); right: 0; bottom: 0;
  width: min(420px, 100vw); display: flex; flex-direction: column;
  background: var(--surface); border-left: 1px solid var(--border); box-shadow: var(--shadow-lg);
  animation: slidein .2s ease;
}
@keyframes slidein { from { transform: translateX(16px); opacity: 0; } to { transform: none; opacity: 1; } }
body.ai-open .main { padding-right: 452px; }
/* three tabs need the room: the set name hides on narrower desktops */
@media (max-width: 1320px) { .set-title { display: none; } }
/* on laptop widths the question list steps aside while the assistant is open */
@media (max-width: 1360px) and (min-width: 961px) {
  body.ai-open .layout { grid-template-columns: minmax(0, 1fr); }
  body.ai-open .sidebar { display: none; }
}
.ai-head { display: flex; align-items: center; gap: 4px; padding: 10px 10px 10px 16px; border-bottom: 1px solid var(--border); }
.ai-title { flex: 1; min-width: 0; display: flex; align-items: center; gap: 10px; }
.ai-title > div { min-width: 0; display: flex; flex-direction: column; line-height: 1.25; }
.ai-title b { font-size: 15px; }
.ai-title span#ai-ctx { font-size: 12.5px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ai-mark { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary); flex: none; }
.ai-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 14px; scrollbar-width: thin; }
.ai-intro { color: var(--text-2); font-size: 14px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.ai-intro p { margin: 0; }
.ai-intro p + p { margin-top: 8px; }
.msg { display: flex; gap: 10px; align-items: flex-start; }
.msg.user { justify-content: flex-end; }
.msg .bubble { min-width: 0; max-width: 88%; font-size: 14.5px; line-height: 1.55; overflow-wrap: anywhere; }
.msg.user .bubble { background: var(--primary); color: var(--on-primary); padding: 9px 13px; border-radius: 14px 14px 4px 14px; }
.msg.ai .bubble { color: var(--text); padding-top: 3px; }
.msg .avatar { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; flex: none; background: var(--primary-soft); color: var(--primary); }
.md p { margin: 0 0 .6em; }
.md p:last-child { margin-bottom: 0; }
.md ul, .md ol { margin: .2em 0 .7em; padding-left: 1.3em; }
.md li { margin: .2em 0; }
.md code { font-family: var(--font-mono); font-size: .9em; background: var(--surface-2); padding: 1px 4px; border-radius: 4px; }
.md .md-h { font-weight: 600; }
.md u { text-underline-offset: 3px; }
.msg-error { margin-top: 6px; font-size: 13px; color: var(--bad); }
.thinking { display: inline-flex; align-items: center; gap: 4px; color: var(--muted); font-size: 13.5px; }
.thinking i { width: 5px; height: 5px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite ease-in-out; }
.thinking i:nth-child(2) { animation-delay: .15s; }
.thinking i:nth-child(3) { animation-delay: .3s; margin-right: 4px; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }
.ai-chips { display: flex; gap: 6px; flex-wrap: wrap; padding: 0 16px 10px; }
.ai-chips .chip { height: 28px; font-size: 12.5px; }
.ai-form { display: flex; gap: 8px; align-items: flex-end; margin: 0 12px; padding: 8px 8px 8px 12px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow-sm); }
.ai-form:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }
.ai-form textarea { flex: 1; min-width: 0; resize: none; border: 0; outline: none; background: transparent; color: var(--text); font: 14.5px/1.45 var(--font-ui); max-height: 160px; padding: 5px 0; }
.ai-send { width: 34px; height: 34px; border-radius: 10px; border: 0; background: var(--primary); color: var(--on-primary); display: grid; place-items: center; cursor: pointer; flex: none; }
.ai-form.busy .ai-send { background: var(--text); color: var(--bg); }
.ai-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 14px calc(10px + env(safe-area-inset-bottom, 0px)); font-size: 11.5px; color: var(--muted); }
.ai-tier { display: flex; gap: 2px; padding: 2px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--border); }
.ai-tier button { border: 0; background: transparent; color: var(--text-2); font-size: 12px; padding: 3px 9px; border-radius: 6px; cursor: pointer; }
.ai-tier button.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }
.ai-panel.history .ai-form, .ai-panel.history .ai-foot .ai-tier { visibility: hidden; }
.ai-hist { display: flex; flex-direction: column; gap: 6px; }
.hist-row { display: flex; align-items: center; gap: 4px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.hist-open { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border: 0; background: transparent; text-align: left; cursor: pointer; }
.hist-open:hover { background: var(--surface-2); border-radius: 12px; }
.hist-open b { font-size: 14px; }
.hist-open span { font-size: 13px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hist-open small { font-size: 11.5px; color: var(--muted); }
.selpop button { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; border: 0; background: transparent; color: inherit; font: inherit; cursor: pointer; border-radius: 10px; }
.selpop button + button, .selpop .selpop-note + button { border-left: 1px solid color-mix(in srgb, var(--bg) 25%, transparent); border-radius: 0 10px 10px 0; }
.selpop-note { display: inline-flex; align-items: center; gap: 6px; padding: 0 12px; opacity: .75; }
@media (max-width: 960px) {
  body.ai-open .main { padding-right: 16px; }
  .ai-panel { top: 0; width: 100vw; border-left: 0; padding-top: env(safe-area-inset-top, 0px); }
  .ai-fab { bottom: calc(76px + env(safe-area-inset-bottom, 0px)); right: 14px; height: 44px; padding: 0 14px; }
}
@media (max-width: 600px) {
  .ai-fab span { display: none; }
  .ai-fab { width: 46px; justify-content: center; padding: 0; }
}

/* ---------------------------------------------------------------- toast & dialog */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 80;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: 14px; box-shadow: var(--shadow-lg);
  animation: fadein .2s ease;
}
dialog { border: 1px solid var(--border); border-radius: 16px; padding: 22px; background: var(--surface); color: var(--text); box-shadow: var(--shadow-lg); width: min(420px, calc(100vw - 32px)); }
dialog::backdrop { background: var(--scrim); backdrop-filter: blur(2px); }
dialog h3 { margin: 0 0 8px; font-size: 17px; }
dialog p { margin: 0 0 18px; color: var(--text-2); font-size: 14.5px; }
dialog .row { display: flex; justify-content: flex-end; gap: 8px; }
.btn-danger { background: var(--bad); color: var(--on-solid); }

/* ---------------------------------------------------------------- responsive */
.only-mobile { display: none; }
.backdrop { display: none; }
@media (max-width: 960px) {
  :root { --sidebar-w: 300px; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; height: 100vh; width: min(var(--sidebar-w), 86vw); z-index: 60;
    background: var(--bg); transform: translateX(-102%); transition: transform .25s ease; box-shadow: var(--shadow-lg);
  }
  body.sidebar-open .sidebar { transform: none; }
  body.sidebar-open .backdrop { display: block; position: fixed; inset: 0; z-index: 55; background: var(--scrim); }
  .only-mobile { display: inline-grid; }
  .set-sub { display: none; }
  .main { padding: 18px 16px 110px; }
  .passage { padding: 20px 18px; font-size: 17.5px; }
  .choice { font-size: 16px; padding: 12px 12px; gap: 12px; }
  .qnav {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 25; margin: 0; padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
    background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
  }
  .hints { display: none; }
  .set-title { display: none; }
  .vseg { display: flex; }
  .tabs { margin-left: 4px; }
  .flash { padding: 20px 18px 22px; }
  .wrow-main { grid-template-columns: 8px 1fr auto; }
  .wrow-main .wdef { grid-column: 2 / 4; white-space: normal; }
  .wrow-body { padding-left: 16px; }
}
@media (max-width: 600px) {
  .topbar { padding: 0 10px; gap: 6px; }
  .brand span { display: none; }
  .set-title { padding-left: 10px; margin-left: 0; }
  .score .label { display: none; }
  .strike { width: 34px; }
  .qnav .btn-label { display: none; }
  .tab { padding: 0 9px; }
  .tab span:not(.tab-badge) { display: none; }
  .grades { grid-template-columns: repeat(2, 1fr); }
  .brand { display: none; }
  .score { display: none; }   /* the streak chip and the Today view carry progress on phones */
  .list-head { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------------------------------------------------------------- vocabulary size test */
.side-btn { margin-top: 10px; width: 100%; justify-content: center; }
.side-btn.active { border-color: var(--primary); color: var(--primary); }
.vt, .vt-result { padding: 24px 26px 22px; }
.vt p { margin: 0 0 8px; color: var(--text-2); line-height: 1.55; }
.vt-last { margin-top: 16px !important; font-size: 14px; }
.vt-item { padding: 40px 26px 26px; text-align: center; }
.vt-word { font: 600 clamp(34px, 7vw, 48px)/1.15 var(--font-read); letter-spacing: -0.01em; overflow-wrap: anywhere; }
.vt-item > .muted { margin: 8px 0 26px; }
.vt-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 460px; margin: 0 auto; }
.vt-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 56px; border-radius: 14px; cursor: pointer;
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text); font: 600 16px var(--font-ui);
  box-shadow: var(--shadow-sm); transition: border-color .15s, background .15s, transform .08s;
}
.vt-btn:active { transform: translateY(1px); }
.vt-btn.yes:hover { border-color: var(--ok); background: var(--ok-soft); }
.vt-btn.no:hover { border-color: var(--bad); background: var(--bad-soft); }
.vt-btn kbd { opacity: .6; }
.vt-undo { margin-top: 18px; display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.vt-big { font: 700 clamp(40px, 8vw, 56px)/1.05 var(--font-ui); letter-spacing: -0.02em; }
.vt-big span { font-size: .45em; font-weight: 600; color: var(--muted); letter-spacing: 0; }
.vt-result > p { line-height: 1.55; color: var(--text-2); }
.vt-result > p.muted { color: var(--muted); font-size: 14px; }
.vt-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 18px 0; }
.vt-stats > div { padding: 12px 14px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); display: flex; flex-direction: column; gap: 2px; }
.vt-stats b { font-size: 22px; font-variant-numeric: tabular-nums; }
.vt-stats span { font-size: 13px; color: var(--muted); }
.vt-bands { display: flex; flex-direction: column; gap: 6px; margin: 6px 0 16px; }
.vt-band { display: grid; grid-template-columns: 96px 1fr 44px; gap: 10px; align-items: center; font-size: 13px; color: var(--text-2); font-variant-numeric: tabular-nums; }
.vt-bar { height: 10px; border-radius: 6px; background: var(--surface-2); overflow: hidden; border: 1px solid var(--border); }
.vt-bar span { display: block; height: 100%; background: var(--primary); border-radius: 6px; }
.vt-pct { text-align: right; }
.vt-warn { display: flex; gap: 8px; align-items: flex-start; padding: 10px 12px; border-radius: 10px; background: var(--bad-soft); color: var(--bad) !important; }
@media (max-width: 600px) { .vt, .vt-result, .vt-item { padding-left: 16px; padding-right: 16px; } .vt-stats { grid-template-columns: 1fr; } .vt-band { grid-template-columns: 80px 1fr 40px; } }
/* narrow phones with three-digit badges: keep the top bar inside the screen */
@media (max-width: 420px) {
  .topbar { gap: 4px; padding: 0 8px; }
  .tab { padding: 0 7px; gap: 5px; }
  .tab-badge { padding: 0 4px; }
  .streak-chip { padding: 0 6px; }
  .topbar .icon-btn { width: 32px; }
}