/* ============================================================================
   STUDYBUDDY · "Midnight Almanac"
   A nocturnal study desk: ink field, lamplight amber, parchment citations,
   instrument-mono data, literary serif prose. Dark + light, both first-class.
   ========================================================================== */

/* ---- tokens : dark (default) ---- */
:root, [data-theme="dark"] {
  --bg:        #0a0d14;
  --bg-2:      #0c111b;
  --surface:   rgba(22, 28, 42, 0.66);
  --surface-2: rgba(28, 35, 52, 0.6);
  --paper:     #1a160d;       /* citation parchment */
  --paper-ink: #ece0c4;
  --line:      rgba(233, 221, 196, 0.11);
  --line-2:    rgba(233, 221, 196, 0.18);

  --text:   #ede3d0;
  --text-2: #a9a392;
  --text-3: #6e6a5f;

  --amber:        #e8b35e;
  --amber-bright: #f7cf88;
  --amber-deep:   #c5853a;
  --amber-soft:   rgba(232, 179, 94, 0.14);

  --teal:      #79c8aa;
  --teal-soft: rgba(121, 200, 170, 0.14);
  --clay:      #e58d6c;
  --clay-soft: rgba(229, 141, 108, 0.15);

  --on-amber: #16110a;
  --shadow:   0 24px 60px -28px rgba(0,0,0,0.85), 0 2px 10px -4px rgba(0,0,0,0.6);
  --shadow-amber: 0 0 0 1px rgba(232,179,94,0.18), 0 18px 50px -26px rgba(232,179,94,0.35);
  --lamp: radial-gradient(60% 45% at 50% -8%, rgba(244, 196, 122, 0.20), rgba(244,196,122,0.06) 38%, transparent 70%);
  --grain-opacity: 0.05;
  --blur: saturate(1.1) blur(14px);
}

[data-theme="light"] {
  --bg:        #f1e9d7;
  --bg-2:      #ede4cf;
  --surface:   rgba(255, 251, 243, 0.82);
  --surface-2: rgba(250, 244, 232, 0.75);
  --paper:     #f8e9cd;
  --paper-ink: #2a2114;
  --line:      rgba(60, 44, 16, 0.13);
  --line-2:    rgba(60, 44, 16, 0.22);

  --text:   #211c12;
  --text-2: #5f5640;
  --text-3: #938974;

  --amber:        #b06a1d;
  --amber-bright: #c9842c;
  --amber-deep:   #8f5413;
  --amber-soft:   rgba(176, 106, 29, 0.12);

  --teal:      #2c7d62;
  --teal-soft: rgba(44, 125, 98, 0.13);
  --clay:      #b3522f;
  --clay-soft: rgba(179, 82, 47, 0.12);

  --on-amber: #fdf6e7;
  --shadow:   0 22px 50px -30px rgba(70, 50, 20, 0.45), 0 2px 8px -4px rgba(70,50,20,0.18);
  --shadow-amber: 0 0 0 1px rgba(176,106,29,0.22), 0 18px 44px -26px rgba(176,106,29,0.3);
  --lamp: radial-gradient(58% 42% at 50% -6%, rgba(214, 160, 86, 0.28), rgba(214,160,86,0.08) 40%, transparent 72%);
  --grain-opacity: 0.035;
  --blur: saturate(1.05) blur(12px);
}

/* ---- reset / base ---- */
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* author display rules must not override the hidden attribute */
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Newsreader", Georgia, serif;
  font-size: 17px;
  line-height: 1.55;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--amber-soft); color: var(--text); }
.display { font-family: "Instrument Serif", Georgia, serif; font-weight: 400; letter-spacing: 0.01em; }
.muted { color: var(--text-2); }
.small { font-size: 0.86rem; }
code, kbd, .mono { font-family: "IBM Plex Mono", ui-monospace, monospace; }

/* ---- atmosphere ---- */
.atmos { position: fixed; inset: 0; z-index: -1; pointer-events: none; background: var(--bg); }
.lamp { position: absolute; inset: 0; background: var(--lamp); }
.vignette { position: absolute; inset: 0; background: radial-gradient(120% 90% at 50% 30%, transparent 55%, rgba(0,0,0,0.28)); }
[data-theme="light"] .vignette { background: radial-gradient(120% 90% at 50% 30%, transparent 60%, rgba(80,55,20,0.10)); }
.grain {
  position: absolute; inset: -50%;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* ---- topbar ---- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 18px;
  padding: 14px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.mark { width: 22px; height: 22px; fill: var(--amber); stroke: none; filter: drop-shadow(0 0 8px var(--amber-soft)); }
.mark circle { fill: var(--amber-bright); }
.mark.big { width: 40px; height: 40px; }
.wordmark { font-family: "Instrument Serif", serif; font-size: 1.5rem; line-height: 1; }
.nav { display: flex; gap: 4px; margin-left: 6px; flex: 1; }
.nav-link {
  font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-2); background: none; border: 0; padding: 8px 12px; border-radius: 8px; cursor: pointer;
  transition: color .18s, background .18s;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--amber); }
.nav-link.active::after { content: ""; display: block; height: 2px; margin-top: 5px; border-radius: 2px; background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.who { font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; color: var(--text-2); }
.icon-btn { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); cursor: pointer; transition: border-color .18s, transform .18s; }
.icon-btn:hover { border-color: var(--line-2); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .i-sun { display: none; }
[data-theme="light"] .theme-toggle .i-moon { display: none; }
[data-theme="light"] .theme-toggle .i-sun { display: block; }

/* ---- main / screens ---- */
#main { max-width: 920px; margin: 0 auto; padding: clamp(20px, 4vw, 44px) clamp(16px, 4vw, 40px) 80px; }
.screen-head { margin-bottom: 22px; }
.eyebrow { font-family: "IBM Plex Mono", monospace; font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber); margin: 0 0 6px; }
.screen-title { font-size: clamp(2rem, 5vw, 2.9rem); margin: 0; line-height: 1.04; }

/* ---- cards ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
}
.card-title { font-family: "Instrument Serif", serif; font-size: 1.5rem; margin: 0 0 6px; }

/* ---- buttons ---- */
.btn {
  font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; letter-spacing: 0.06em;
  padding: 11px 18px; border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s, color .2s;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
.btn.sm { padding: 7px 12px; font-size: 0.72rem; }
.btn.primary { background: linear-gradient(180deg, var(--amber-bright), var(--amber)); color: var(--on-amber); box-shadow: 0 10px 24px -12px var(--amber); }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -12px var(--amber); }
.btn.ghost { background: var(--surface-2); color: var(--text); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--line-2); transform: translateY(-1px); }
.btn.amber-ghost { background: var(--amber-soft); color: var(--amber); border-color: color-mix(in srgb, var(--amber) 40%, transparent); }
.btn.amber-ghost:hover { background: color-mix(in srgb, var(--amber) 18%, transparent); transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.985); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---- focus-visible : visible on everything ---- */
:focus { outline: none; }
:focus-visible,
.opt:focus-within {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-radius: 8px;
}
a:focus-visible, .btn:focus-visible, .nav-link:focus-visible, .icon-btn:focus-visible { outline-offset: 3px; }

/* ---- forms ---- */
.field { display: block; margin: 0 0 14px; }
.field > span { display: block; font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-2); margin-bottom: 7px; }
.field em { color: var(--text-3); font-style: normal; }
input[type=text], input[type=email], input[type=password], input[type=date], textarea {
  width: 100%; padding: 12px 14px; font-family: "Newsreader", serif; font-size: 1rem;
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--line-2); border-radius: 10px;
  transition: border-color .18s, box-shadow .18s;
}
input::placeholder, textarea::placeholder { color: var(--text-3); }
input:focus-visible, textarea:focus-visible { outline: none; border-color: var(--amber); box-shadow: 0 0 0 3px var(--amber-soft); }
textarea { min-height: 110px; resize: vertical; line-height: 1.5; }
.check { display: flex; align-items: center; gap: 10px; margin: 8px 0 14px; color: var(--text); cursor: pointer; }
.check input { width: 17px; height: 17px; accent-color: var(--amber); }
.hint { font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; color: var(--text-3); }
.hint code, code { font-size: 0.82em; background: var(--surface-2); padding: 2px 6px; border-radius: 5px; color: var(--amber); border: 1px solid var(--line); }
.error-text { color: var(--clay); font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; min-height: 1em; margin: 8px 0 0; }

/* ============ AUTH ============ */
.auth-screen { min-height: calc(100vh - 88px); display: grid; place-items: center; }
.auth-wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(28px, 6vw, 64px); align-items: center; max-width: 880px; }
.auth-hero .mark.big { margin-bottom: 14px; }
.auth-hero .display { font-size: clamp(2.8rem, 8vw, 4.2rem); line-height: 0.98; margin: 0 0 14px; }
.lede { color: var(--text-2); font-size: 1.12rem; max-width: 34ch; }
.auth-card { width: 100%; }
.auth-actions { display: flex; gap: 10px; margin-top: 6px; }
.auth-actions .btn { flex: 1; }

/* ============ QUIZ ============ */
.quiz-screen { max-width: 720px; margin: 0 auto; }
.quiz-card { position: relative; overflow: hidden; }
.quiz-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: linear-gradient(90deg, transparent, var(--amber), transparent); opacity: .5; }
.q-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 16px; }
.tag { font-family: "IBM Plex Mono", monospace; font-size: 0.7rem; letter-spacing: 0.06em; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line-2); }
.tag.concept { background: var(--amber-soft); color: var(--amber); border-color: color-mix(in srgb, var(--amber) 35%, transparent); }
.tag.reason { color: var(--text-2); text-transform: uppercase; font-size: 0.62rem; letter-spacing: 0.12em; }
.difficulty { display: inline-flex; gap: 3px; }
.difficulty i { width: 7px; height: 7px; transform: rotate(45deg); background: var(--text-3); border-radius: 1px; opacity: .5; }
.difficulty i.on { background: var(--amber); opacity: 1; box-shadow: 0 0 6px var(--amber-soft); }

.q-text { font-family: "Newsreader", serif; font-weight: 500; font-size: clamp(1.3rem, 3.4vw, 1.7rem); line-height: 1.32; margin: 0 0 22px; }

.q-form { display: grid; gap: 10px; }
.opt {
  position: relative; display: flex; align-items: flex-start; gap: 13px;
  padding: 14px 16px; border: 1px solid var(--line-2); border-radius: 12px;
  background: var(--bg-2); cursor: pointer;
  transition: border-color .16s, background .16s, transform .12s;
}
.opt:hover { border-color: var(--amber); transform: translateX(3px); }
.opt input { position: absolute; opacity: 0; pointer-events: none; }
.opt .key { flex: none; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 7px; border: 1px solid var(--line-2); font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; color: var(--text-2); transition: all .16s; }
.opt .txt { flex: 1; }
.opt.selected { border-color: var(--amber); background: var(--amber-soft); }
.opt.selected .key { background: var(--amber); color: var(--on-amber); border-color: var(--amber); }
.opt.correct { border-color: var(--teal); background: var(--teal-soft); }
.opt.correct .key { background: var(--teal); color: var(--on-amber); border-color: var(--teal); }
.opt.incorrect { border-color: var(--clay); background: var(--clay-soft); }
.opt.incorrect .key { background: var(--clay); color: var(--on-amber); border-color: var(--clay); }
.opt.locked { pointer-events: none; }
.opt.locked:hover { transform: none; }
.opt.shake { animation: shake .42s; }

.q-foot { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 20px; flex-wrap: wrap; }
.q-actions { display: flex; gap: 10px; }
.kbd-hint { font-family: "IBM Plex Mono", monospace; font-size: 0.7rem; color: var(--text-3); margin: 0; }
kbd { font-family: "IBM Plex Mono", monospace; font-size: 0.78em; padding: 1px 6px; border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 5px; background: var(--surface-2); color: var(--text-2); }

/* result */
.result { margin-top: 8px; border-top: 1px solid var(--line); padding-top: 18px; }
.verdict { font-family: "Instrument Serif", serif; font-size: 1.7rem; margin-bottom: 4px; }
.verdict.ok { color: var(--teal); } .verdict.bad { color: var(--clay); }
.verdict.pop { animation: pop .4s; }
.feedback { color: var(--text-2); margin: 2px 0 12px; }
.reveal-answer { border: 1px solid var(--line); border-radius: 10px; padding: 4px 14px; background: var(--bg-2); }
.reveal-answer summary { cursor: pointer; font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-2); padding: 9px 0; }
.reveal-answer[open] summary { color: var(--amber); }
.reveal-answer .ref { font-family: "Newsreader", serif; margin: 4px 0 8px; }
.result-actions { display: flex; gap: 10px; margin-top: 16px; }

/* why panel : the signature */
.why-panel {
  margin-top: 18px; padding: 24px clamp(18px, 3vw, 28px);
  background:
    radial-gradient(120% 60% at 0% 0%, color-mix(in srgb, var(--amber) 10%, transparent), transparent 60%),
    var(--paper);
  color: var(--paper-ink);
  border: 1px solid color-mix(in srgb, var(--amber) 24%, var(--line));
  border-radius: 14px;
  box-shadow: var(--shadow-amber);
  animation: settle .5s ease both;
}
.why-kicker { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber-deep); }
[data-theme="dark"] .why-kicker { color: var(--amber); }
.why-title { font-family: "Instrument Serif", serif; font-size: 1.55rem; margin: 4px 0 14px; color: var(--paper-ink); }
.why-prose { font-family: "Newsreader", serif; font-size: 1.05rem; line-height: 1.6; margin: 0 0 18px; color: var(--paper-ink); }
.citations { display: grid; gap: 14px; }
.cite {
  position: relative; padding: 4px 4px 4px 22px;
  border-left: 3px solid var(--amber);
}
.cite::before { content: ""; position: absolute; left: -1px; top: 0; bottom: 0; width: 3px; background: var(--amber); box-shadow: 0 0 12px var(--amber); border-radius: 3px; transform-origin: top; animation: draw .55s ease both; }
.cite .lbl { font-family: "IBM Plex Mono", monospace; font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--amber-deep); }
[data-theme="dark"] .cite .lbl { color: var(--amber-bright); }
.cite .loc { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; color: color-mix(in srgb, var(--paper-ink) 55%, transparent); margin-top: 1px; }
.cite blockquote { font-family: "Newsreader", serif; font-style: italic; font-size: 1.08rem; line-height: 1.5; margin: 8px 0 0; color: var(--paper-ink); }
.related-head { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber-deep); margin: 18px 0 4px; }
[data-theme="dark"] .related-head { color: var(--amber); }
.related-note { font-size: 0.78rem; color: color-mix(in srgb, var(--paper-ink) 60%, transparent); margin: 0 0 10px; }
.why-status { font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; color: var(--clay); margin: 12px 0 0; }

/* session tracker */
.q-progress { display: flex; align-items: center; gap: 12px; margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); }
.ticks { display: flex; gap: 5px; flex: none; }
.ticks i { width: 16px; height: 3px; border-radius: 2px; background: var(--line-2); transition: background .3s; }
.ticks i.done { background: var(--amber); }
.ticks i.cur { background: var(--text-2); }
.progress-label { font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; color: var(--text-2); flex: 1; }
.streak { font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; color: var(--amber); }

/* enroll / empty / summary */
.enroll-card, .empty-state, .session-summary { text-align: center; }
.empty-glyph { font-size: 2.4rem; color: var(--amber); opacity: .7; }
.session-summary .eyebrow { color: var(--amber); }
.summary-stat { margin: 12px 0 4px; }
.summary-num { font-size: 3.4rem; line-height: 1; color: var(--amber); }
.summary-label { display: block; font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-2); margin-top: 4px; }
.session-summary .btn { margin-top: 16px; }

/* ============ DASHBOARD ============ */
.dash-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; }
.dash-hero { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.countdown-num { font-size: clamp(3.4rem, 11vw, 6rem); line-height: 0.9; color: var(--amber); }
.countdown-label { font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-2); }
.ring { --p: 0; width: 132px; height: 132px; border-radius: 50%; display: grid; place-items: center; align-content: center; gap: 2px; flex: none;
  background: radial-gradient(closest-side, var(--surface) 70%, transparent 71%), conic-gradient(var(--amber) calc(var(--p) * 1%), var(--line-2) 0); }
.ring b { font-family: "Instrument Serif", serif; font-size: 1.8rem; line-height: 1; color: var(--text); }
.ring span { font-family: "IBM Plex Mono", monospace; font-size: 0.54rem; line-height: 1; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-2); }
.revise-next .nxt-name { font-family: "Instrument Serif", serif; font-size: 1.5rem; margin: 6px 0 14px; }
.stat-row { display: flex; gap: 26px; margin-top: 4px; }
.stat .n { font-family: "Instrument Serif", serif; font-size: 1.8rem; color: var(--text); }
.stat .l { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-2); }
.bar { height: 7px; border-radius: 4px; background: var(--bg-2); overflow: hidden; border: 1px solid var(--line); }
.bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--amber-deep), var(--amber-bright)); border-radius: 4px; }

/* ============ PROGRESS ============ */
.progress-totals { font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; color: var(--text-2); margin: 0 0 16px; }
.atlas { display: grid; gap: 8px; }
.atlas-row { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow: hidden; }
.atlas-row summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: 1fr auto; gap: 12px 16px; align-items: center; padding: 14px 18px; }
.atlas-row summary::-webkit-details-marker { display: none; }
.atlas-name { font-family: "Newsreader", serif; font-size: 1.05rem; }
.atlas-meta { display: flex; align-items: center; gap: 10px; }
.atlas-week { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; color: var(--text-3); }
.conf { display: flex; align-items: center; gap: 10px; min-width: 130px; }
.conf .bar { flex: 1; }
.conf .pct { font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; color: var(--text-2); width: 38px; text-align: right; }
.atlas-row[open] { border-color: var(--line-2); }
.atlas-detail { padding: 0 18px 16px; color: var(--text-2); font-size: 0.92rem; border-top: 1px solid var(--line); margin-top: -1px; }
.atlas-detail dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 12px 0 0; }
.atlas-detail dt { font-family: "IBM Plex Mono", monospace; font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.stale { color: var(--clay); }

/* ============ LEADERBOARD ============ */
.lb { display: grid; gap: 6px; }
.lb-row { display: grid; grid-template-columns: 44px 1fr auto; gap: 16px; align-items: center; padding: 13px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.lb-rank { font-family: "Instrument Serif", serif; font-size: 1.4rem; color: var(--text-2); text-align: center; }
.lb-row:nth-child(1) .lb-rank { color: var(--amber); }
.lb-name { font-family: "Newsreader", serif; font-size: 1.06rem; }
.lb-you { font-family: "IBM Plex Mono", monospace; font-size: 0.6rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); border: 1px solid color-mix(in srgb, var(--amber) 40%, transparent); padding: 1px 6px; border-radius: 999px; margin-left: 8px; }
.lb-nums { display: flex; gap: 18px; font-family: "IBM Plex Mono", monospace; font-size: 0.82rem; }
.lb-nums b { color: var(--text); } .lb-nums span { color: var(--text-3); }
.lb-row.me { border-color: color-mix(in srgb, var(--amber) 45%, transparent); background: var(--amber-soft); box-shadow: var(--shadow-amber); }

/* ============ SETTINGS ============ */
.settings-card { margin-bottom: 14px; }
.seg { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 11px; background: var(--bg-2); }
.seg-btn { font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; padding: 8px 16px; border: 0; border-radius: 8px; background: none; color: var(--text-2); cursor: pointer; transition: all .16s; }
.seg-btn:hover { color: var(--text); }
.seg-btn.active { background: var(--amber); color: var(--on-amber); }

/* ---- toasts ---- */
.toasts { position: fixed; z-index: 90; bottom: 22px; left: 50%; transform: translateX(-50%); display: grid; gap: 8px; width: min(92vw, 440px); pointer-events: none; }
.toast { pointer-events: auto; display: flex; align-items: flex-start; gap: 10px; padding: 12px 15px; border-radius: 11px; background: var(--surface); border: 1px solid var(--line-2); box-shadow: var(--shadow); backdrop-filter: var(--blur); font-size: 0.92rem; animation: toast-in .3s ease both; }
.toast.err { border-color: color-mix(in srgb, var(--clay) 55%, transparent); }
.toast .dot { width: 8px; height: 8px; border-radius: 50%; margin-top: 7px; flex: none; background: var(--clay); }
.toast.ok .dot { background: var(--teal); }

/* ---- skeletons ---- */
.skeleton-card .sk { border-radius: 8px; background: linear-gradient(90deg, var(--surface-2) 25%, color-mix(in srgb, var(--text) 8%, var(--surface-2)) 37%, var(--surface-2) 63%); background-size: 400% 100%; animation: shimmer 1.4s infinite; }
.sk-tag { width: 130px; height: 22px; margin-bottom: 18px; }
.sk-line { height: 18px; margin-bottom: 10px; } .sk-line.lg { height: 26px; width: 85%; }
.sk-opt { height: 50px; margin-top: 10px; border-radius: 12px; }

/* ---- page-load reveal ---- */
.reveal > * { animation: rise .6s cubic-bezier(.2,.7,.2,1) both; }
.reveal > *:nth-child(1) { animation-delay: .05s; }
.reveal > *:nth-child(2) { animation-delay: .14s; }
.screen:not([hidden]) > .screen-head { animation: rise .55s cubic-bezier(.2,.7,.2,1) both; }
.screen:not([hidden]) > .screen-head + * { animation: rise .6s cubic-bezier(.2,.7,.2,1) both .08s; }
.quiz-card:not([hidden]) { animation: rise .5s cubic-bezier(.2,.7,.2,1) both; }

/* ---- keyframes ---- */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes settle { from { opacity: 0; transform: translateY(10px) scale(.99); } to { opacity: 1; transform: none; } }
@keyframes draw { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes pop { 0% { transform: scale(.9); } 55% { transform: scale(1.06); } 100% { transform: scale(1); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 20% { transform: translateX(-6px); } 40% { transform: translateX(6px); } 60% { transform: translateX(-4px); } 80% { transform: translateX(4px); } }
@keyframes shimmer { to { background-position: -200% 0; } }
@keyframes toast-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---- responsive ---- */
@media (max-width: 760px) {
  .auth-wrap { grid-template-columns: 1fr; text-align: left; }
  .nav { order: 3; flex-basis: 100%; margin-left: 0; justify-content: space-between; gap: 0; }
  .dash-grid, .dash-hero { grid-template-columns: 1fr; }
  .dash-hero { gap: 16px; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .topbar { flex-wrap: wrap; gap: 10px; }
  .topbar-right { margin-left: auto; }
  .who { display: none; }
  .nav-link { padding: 8px 6px; letter-spacing: 0.08em; font-size: 0.68rem; }
  .q-foot { flex-direction: column; align-items: stretch; }
  .kbd-hint { display: none; }
  .lb-row { grid-template-columns: 34px 1fr; }
  .lb-nums { grid-column: 2; }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .opt:hover, .btn:hover { transform: none; }
}

/* ---- public demo entry ---- */
.demo-note { color: var(--text-3); font-size: 0.92rem; max-width: 40ch; margin-top: 10px; }
.demo-box { display: grid; gap: 10px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.demo-box .btn { width: 100%; }
.linkish { background: none; border: 0; padding: 0; color: var(--amber); text-decoration: underline; cursor: pointer; font: inherit; }

/* ---- landing: what it is ---- */
.why-mini { margin: 22px 0 0; padding: 16px 18px; max-width: 40ch; background: var(--paper); color: var(--paper-ink); border: 1px solid color-mix(in srgb, var(--amber) 24%, var(--line)); border-radius: 12px; box-shadow: var(--shadow-amber); }
.why-mini .wm-q { font-family: "Newsreader", serif; font-size: 0.95rem; margin: 6px 0 12px; opacity: .85; }
.why-mini .cite blockquote { font-size: 0.98rem; margin-top: 6px; }
.btn.big { padding: 14px 18px; font-size: 0.9rem; }
.guest-sub { margin: 0; text-align: center; }
.auth-card .demo-box { margin-top: 0; padding-top: 0; border-top: 0; margin-bottom: 4px; }
.or-line { display: flex; align-items: center; gap: 12px; margin: 6px 0 14px; color: var(--text-3); font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: .1em; text-transform: uppercase; }
.or-line::before, .or-line::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.demo-sample { color: var(--text-3); font-size: 0.84rem; margin: 10px 0 0; }

/* first paint: signed-in visitors skip the login shell until app.js picks the screen */
.has-token #screen-auth { display: none; }