/* AutoMCQ — OMR answer-sheet design system */

:root {
  --paper: #ECEFF4;
  --ink: #1E2128;
  --pencil: #6B7280;
  --pen-red: #C1440E;
  --correct-green: #2C8C5B;

  --graphite: #8B93A3;
  --line: rgba(30, 33, 40, 0.14);
  --line-strong: rgba(30, 33, 40, 0.28);

  --surface-card: rgba(255, 255, 255, 0.6);
  --surface-card-soft: rgba(255, 255, 255, 0.5);
  --bubble-fill: #FFFFFF;
  --input-bg: #FFFFFF;
  --table-head-bg: rgba(30, 33, 40, 0.05);
  --grid-line: rgba(30, 33, 40, 0.025);
  --grid-line-weak: rgba(30, 33, 40, 0.03);
  --shadow-color: rgba(30, 33, 40, 0.85);
  --shadow-ghost: rgba(30, 33, 40, 0.4);
  --shadow-soft: rgba(30, 33, 40, 0.25);
  --reward-label: rgba(236, 239, 244, 0.6);
  --reward-hint: rgba(236, 239, 244, 0.85);

  --font-mono: "Space Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* Dark palette, applied automatically from the OS unless overridden. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #15171C;
    --ink: #ECEFF4;
    --pencil: #9AA3B2;
    --pen-red: #E4703A;
    --correct-green: #3FA96F;

    --graphite: #8B93A3;
    --line: rgba(236, 239, 244, 0.14);
    --line-strong: rgba(236, 239, 244, 0.28);

    --surface-card: rgba(255, 255, 255, 0.06);
    --surface-card-soft: rgba(255, 255, 255, 0.04);
    --bubble-fill: #23262E;
    --input-bg: #23262E;
    --table-head-bg: rgba(236, 239, 244, 0.06);
    --grid-line: rgba(236, 239, 244, 0.03);
    --grid-line-weak: rgba(236, 239, 244, 0.04);
    --shadow-color: rgba(236, 239, 244, 0.5);
    --shadow-ghost: rgba(236, 239, 244, 0.35);
    --shadow-soft: rgba(236, 239, 244, 0.25);
    --reward-label: rgba(30, 33, 40, 0.6);
    --reward-hint: rgba(30, 33, 40, 0.85);
  }
}

/* Manual "dark" override beats the OS light preference. */
:root[data-theme="dark"] {
  --paper: #15171C;
  --ink: #ECEFF4;
  --pencil: #9AA3B2;
  --pen-red: #E4703A;
  --correct-green: #3FA96F;

  --graphite: #8B93A3;
  --line: rgba(236, 239, 244, 0.14);
  --line-strong: rgba(236, 239, 244, 0.28);

  --surface-card: rgba(255, 255, 255, 0.06);
  --surface-card-soft: rgba(255, 255, 255, 0.04);
  --bubble-fill: #23262E;
  --input-bg: #23262E;
  --table-head-bg: rgba(236, 239, 244, 0.06);
  --grid-line: rgba(236, 239, 244, 0.03);
  --grid-line-weak: rgba(236, 239, 244, 0.04);
  --shadow-color: rgba(236, 239, 244, 0.5);
  --shadow-ghost: rgba(236, 239, 244, 0.35);
  --shadow-soft: rgba(236, 239, 244, 0.25);
  --reward-label: rgba(30, 33, 40, 0.6);
  --reward-hint: rgba(30, 33, 40, 0.85);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, transparent 95%, var(--grid-line) 95%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 31px,
      var(--grid-line-weak) 31px,
      var(--grid-line-weak) 32px
    );}

:focus-visible {
  outline: 3px solid var(--pen-red);
  outline-offset: 2px;
}

.container { width: min(1080px, 100% - 2.5rem); margin-inline: auto; }

.mono { font-family: var(--font-mono); }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--line-strong);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.wordmark .pen { color: var(--pen-red); }

.site-nav { display: flex; align-items: center; gap: 1.25rem; }

.site-nav a.nav-link {
  color: var(--pencil);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.site-nav a.nav-link:hover { color: var(--ink); text-decoration: underline; }

.site-nav a.nav-link--active { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 639px) {
  .site-nav a.nav-link { display: none; }
}

/* Header credit widget (echo of the signature element) */

.header-credits { display: none; align-items: center; gap: 0.6rem; }

.header-credits.is-visible { display: flex; }

.header-balance {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
}

/* Theme toggle (moon / sun) */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.12s ease, color 0.12s ease, transform 0.12s ease;
}

.theme-toggle:hover { border-color: var(--pen-red); color: var(--pen-red); transform: translateY(-1px); }

.theme-toggle svg { width: 1.05rem; height: 1.05rem; }

.theme-toggle .icon-sun { display: none; }

.theme-toggle .icon-moon { fill: var(--ink); }

.theme-toggle .icon-sun { stroke: var(--ink); stroke-width: 2; fill: none; stroke-linecap: round; }

.theme-toggle:hover .icon-moon { fill: var(--pen-red); }

.theme-toggle:hover .icon-sun { stroke: var(--pen-red); }

:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

:root[data-theme="dark"] .theme-toggle .icon-sun { stroke: #FFD76A; }
:root[data-theme="dark"] .theme-toggle:hover .icon-sun { stroke: #FFE9A8; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 0.92rem;
  padding: 0.8rem 1.4rem;
  border: 2px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease, color 0.12s ease;
}

.btn:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--shadow-color); }

.btn:active { transform: translate(0, 0); box-shadow: none; }

.btn-primary { background: var(--pen-red); border-color: var(--pen-red); color: #FFFFFF; }
.btn-primary:hover { box-shadow: 4px 4px 0 rgba(193, 68, 14, 0.85); }

.btn-outline { background: transparent; color: var(--ink); }

.btn-ghost { border-color: var(--line-strong); color: var(--pencil); }
.btn-ghost:hover { box-shadow: 3px 3px 0 var(--shadow-ghost); color: var(--ink); }

.btn-small { padding: 0.5rem 0.9rem; font-size: 0.8rem; }

.btn[aria-current="page"] { box-shadow: inset 0 -3px 0 currentColor; }

.btn[disabled] { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

/* ---------- Typography / stamps ---------- */

.dateline {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--pencil);
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  padding: 0.35rem 0.7rem;
  margin: 0 0 1.75rem;
}

.stamp {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.14em;
  font-size: 0.85rem;
  text-transform: uppercase;
  border: 2px solid currentColor;
  padding: 0.2rem 0.6rem;
  transform: rotate(-2deg);
}

.stamp--ok { color: var(--correct-green); }
.stamp--off { color: var(--pen-red); }

.stamp--earned {
  color: var(--correct-green);
  border-width: 3px;
  font-size: 1rem;
  padding: 0.3rem 0.8rem;
  animation: stamp-in 0.25s ease both;
}

@keyframes stamp-in {
  from { opacity: 0; transform: rotate(-4deg) scale(1.4); }
  to { opacity: 1; transform: rotate(-2deg) scale(1); }
}

/* ---------- Hero ---------- */

.hero { padding: clamp(3rem, 8vw, 6rem) 0 4rem; }

.hero-grid-wrap {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 860px) {
  .hero-grid-wrap { grid-template-columns: 1.1fr 0.9fr; }
}

.hero-title {
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.08;
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
}

.hero-title .pen { color: var(--pen-red); }

.hero-lede {
  color: var(--pencil);
  max-width: 34rem;
  margin: 0 0 1.75rem;
  font-size: 1.05rem;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.cost-strip {
  margin-top: 2.25rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
}

.cost-strip .cost-item {
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--pencil);
  border-left: 3px solid var(--pen-red);
  padding-left: 0.6rem;
}

/* OMR sheet demo (hero) */

.hero-sheet {
  border: 1px solid var(--line-strong);
  background: var(--surface-card);
  padding: 1.25rem 1.5rem;
  max-width: 100%;
  overflow-x: auto;
}

.omr-sheet { font-family: var(--font-mono); font-size: 0.8rem; min-width: 15rem; }

.omr-sheet .sheet-cols,
.omr-sheet .sheet-row {
  display: grid;
  grid-template-columns: 2.75rem repeat(4, 1fr);
  gap: 0.4rem;
  align-items: center;
}

.omr-sheet .sheet-cols {
  padding-bottom: 0.5rem;
  color: var(--pencil);
  text-align: center;
  letter-spacing: 0.08em;
}

.omr-sheet .sheet-row {
  padding: 0.4rem 0;
  border-top: 1px dotted var(--line-strong);
}

.omr-sheet .sheet-row .q { color: var(--pencil); }

.hero-bubble {
  display: block;
  margin: 0 auto;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

.hero-bubble .bubble { width: 26px; height: 26px; display: block; }

.hero-bubble .bubble-outline {
  fill: var(--bubble-fill);
  stroke: var(--ink);
  stroke-width: 1.2;
  transition: stroke 0.12s ease;
}

.hero-bubble:hover .bubble-outline { stroke: var(--pen-red); }

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(0.6em);
  animation: reveal 0.6s ease var(--d, 0s) forwards;
}

@keyframes reveal {
  to { opacity: 1; transform: none; }
}

/* ---------- Sections ---------- */

.section { padding: 3.5rem 0; border-top: 1px solid var(--line); }
section[id] { scroll-margin-top: 4.5rem; }

.section-head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 2rem; }

.section-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pen-red);
  font-size: 1rem;
}

.section-title {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  margin: 0;
}

/* Steps */

.steps { display: grid; gap: 1.5rem; grid-template-columns: 1fr; }

@media (min-width: 760px) {
  .steps { grid-template-columns: repeat(4, 1fr); }
}

.step {
  border: 1px solid var(--line-strong);
  background: var(--surface-card-soft);
  padding: 1.25rem;
}

.step-num { font-family: var(--font-mono); font-weight: 700; color: var(--pen-red); font-size: 1.1rem; }

.step-title { font-family: var(--font-mono); font-weight: 700; margin: 0.4rem 0 0.35rem; font-size: 0.95rem; }

.step p { margin: 0; font-size: 0.95rem; color: var(--pencil); }

/* Cost table (scoring grid) */

.cost-grid { border-collapse: collapse; width: 100%; font-family: var(--font-mono); font-size: 0.95rem; }

.cost-grid th,
.cost-grid td { border: 1px solid var(--line-strong); padding: 0.85rem 1rem; text-align: left; }

.cost-grid th {
  background: var(--table-head-bg);
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--pencil);
}

.cost-grid .num { font-weight: 700; }
.cost-grid td .cr { color: var(--pencil); font-size: 0.85rem; }

/* FAQ */

.faq details { border-bottom: 1px solid var(--line-strong); }
.faq details:first-child { border-top: 1px solid var(--line-strong); }

.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0.25rem;
  font-weight: 600;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary .q-num { font-family: var(--font-mono); font-weight: 700; color: var(--pen-red); }

.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  margin-left: auto;
  color: var(--pencil);
}

.faq details[open] summary::after { content: "\2013"; }

.faq .a { padding: 0 0 1.25rem 2.1rem; color: var(--pencil); max-width: 44rem; margin: 0; }

/* ---------- Claim page ---------- */

.claim-title {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  margin: 0 0 0.25rem;
}

.claim-title .pen { color: var(--pen-red); }

.claim-status { margin: 0 0 1.75rem; }

.panel {
  border: 1px solid var(--line-strong);
  background: var(--surface-card);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.panel-title {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  text-transform: uppercase;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.panel-title .tick { color: var(--pen-red); }

/* Device */

.device-id { font-family: var(--font-mono); font-size: 0.95rem; word-break: break-all; margin: 0; }

.device-meta { font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.04em; color: var(--pencil); margin: 0; }

.manual-link { margin-top: 1.25rem; border-top: 1px dashed var(--line-strong); padding-top: 1rem; }

.manual-link summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--pencil);
  letter-spacing: 0.06em;
}

.manual-link summary:hover { color: var(--ink); }

.manual-link form { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.75rem; }

.manual-link input {
  flex: 1 1 18rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--input-bg);
  color: var(--ink);
}

/* Balance — the signature element */

.balance-panel { text-align: center; }

.balance-panel .bubble-grid { margin-inline: auto; }

.balance-readout {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 2.8rem);
  letter-spacing: 0.04em;
  margin: 1.5rem 0 0.25rem;
}

.balance-readout .unit { color: var(--pencil); font-size: 0.85rem; letter-spacing: 0.14em; }

#earnedStamp { margin-top: 0.5rem; }

/* ---------- Scorecard / profile page ---------- */

.score-head {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.score-head-main { flex: 1 1 auto; min-width: 0; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.username-form {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.username-input {
  flex: 0 1 14rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line-strong);
  background: var(--surface-card-soft);
  color: var(--ink);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.username-input:focus { outline: 2px solid var(--pen-red); outline-offset: 1px; }

.username-note { font-size: 0.75rem; color: var(--correct-green); white-space: nowrap; }

.level-badge {
  flex: none;
  width: 5rem;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  background: var(--bubble-fill);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 1.05rem;
  box-shadow: 5px 5px 0 var(--shadow-soft);
  animation: badge-pop 0.4s ease both;
}

@keyframes badge-pop {
  from { transform: scale(0.6) rotate(-8deg); opacity: 0; }
  to { transform: scale(1) rotate(0); opacity: 1; }
}

.score-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: 0.75rem;
  border-top: 1px dashed var(--line-strong);
  padding-top: 1rem;
}

.score-stat {
  border: 1px solid var(--line-strong);
  background: var(--surface-card-soft);
  padding: 0.7rem;
  text-align: center;
}

.score-stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--pencil);
}

.score-stat-value {
  display: block;
  margin-top: 0.25rem;
  font-weight: 700;
  font-size: 1.35rem;
}

.profile-xp-line {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  color: var(--pencil);
}

.xp-next { color: var(--pen-red); font-family: var(--font-mono); font-size: 0.8rem; }

.xp-bar {
  height: 0.65rem;
  border: 1px solid var(--line-strong);
  background: var(--table-head-bg);
  overflow: hidden;
}

.xp-fill {
  display: block;
  height: 100%;
  background: var(--pen-red);
  transition: width 0.5s ease;
}

.streak-line {
  margin: 0.45rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--pencil);
}

.grace-hint { color: var(--correct-green); }

.ach-count { color: var(--pen-red); font-size: 0.8rem; }

/* Attendance record: a row of day-bubbles that fill in with the streak */

.attendance-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.5rem 0;
}

.attend-day { display: inline-flex; }

.attend-day .attend-bubble { width: 34px; height: 34px; display: block; }

.attend-outline {
  fill: var(--bubble-fill);
  stroke: var(--ink);
  stroke-width: 1.2;
}

.attend-fill {
  stroke: var(--pencil);
  stroke-width: 1.6;
  stroke-dasharray: 47;
  stroke-dashoffset: 47;
  fill-opacity: 0;
  transition: stroke-dashoffset 0.3s ease-out, fill-opacity 0.3s ease-out 0.26s;
}

.attend-day--hit .attend-fill {
  stroke-dashoffset: 0;
  fill-opacity: 1;
}

.attend-day--hit .attend-outline { stroke: var(--correct-green); }

.checkin-state { margin: 0.75rem 0 0; font-size: 0.95rem; color: var(--pencil); }

/* Daily quests (claim page) */

.quest-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }

.quest-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  border: 1px solid var(--line);
  padding: 0.6rem 0.75rem;
}

.quest-main { flex: 1 1 auto; min-width: 0; display: grid; gap: 0.4rem; }

.quest-title { font-size: 0.92rem; }

.quest-bar {
  height: 0.45rem;
  border: 1px solid var(--line-strong);
  background: var(--table-head-bg);
  overflow: hidden;
}

.quest-fill { display: block; height: 100%; background: var(--correct-green); transition: width 0.4s ease; }

.quest-side { flex: none; }

.quest-count { font-size: 0.8rem; color: var(--pencil); }

.quest-done {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--correct-green);
  border: 1px solid var(--correct-green);
  padding: 0.15rem 0.4rem;
}

.quest-claim { white-space: nowrap; }

/* Achievements — cards that reveal their clue on hover */

.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr)); gap: 0.6rem; }

.ach {
  border: 1px solid var(--line-strong);
  padding: 0.7rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  opacity: 0.55;
  filter: grayscale(1);
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
}

.ach:hover { transform: translateY(-2px); }

.ach--unlocked { opacity: 1; filter: none; border-color: var(--ink); box-shadow: 3px 3px 0 var(--shadow-soft); }

.ach-head { display: flex; align-items: center; gap: 0.5rem; }

.ach-badge {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border: 2px solid var(--line-strong);
  color: var(--pencil);
  font-family: var(--font-mono);
  font-weight: 700;
}

.ach--unlocked .ach-badge {
  border-color: var(--correct-green);
  color: var(--correct-green);
}

.ach-name { flex: 1 1 auto; font-size: 0.82rem; line-height: 1.3; }

.ach-reward { font-size: 0.72rem; color: var(--correct-green); white-space: nowrap; }

.ach-desc {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--pencil);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.25s ease, opacity 0.25s ease, margin 0.25s ease;
}

.ach:hover .ach-desc,
.ach:focus-within .ach-desc { max-height: 6rem; opacity: 1; margin-top: 0.15rem; }

/* Leaderboard */

.lb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.lb-item {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  border-bottom: 1px dotted var(--line-strong);
  padding: 0.35rem 0;
}

.lb-item--top .lb-rank { color: var(--pen-red); }

.lb-item--mine { background: var(--surface-card-soft); outline: 1px dashed var(--line-strong); }

.lb-rank { width: 1.5rem; color: var(--pencil); }

.lb-device { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.lb-streak { color: var(--pencil); font-size: 0.78rem; }

/* Celebration confetti */

.confetti {
  position: fixed;
  top: -1rem;
  width: 8px;
  height: 8px;
  z-index: 200;
  pointer-events: none;
  animation: confetti-fall 3.8s ease-in forwards;
}

@keyframes confetti-fall {
  to {
    transform: translate(var(--confetti-x, 0), 105vh) rotate(var(--confetti-r, 360deg));
    opacity: 0;
  }
}

/* ---------- No-ads banner ---------- */

.no-ads-banner {
  margin-top: 1.25rem;
  border: 1px dashed var(--line-strong);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.no-ads-banner[hidden] { display: none; }

.no-ads-text { margin: 0; color: var(--pencil); }

/* ---------- Daily check-in ---------- */

.checkin-state { margin: 0.75rem 0 0; font-size: 0.95rem; color: var(--pencil); }

/* ---------- Refer a friend ---------- */

.refer-steps {
  margin: 1rem 0 1.25rem;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.35rem;
  color: var(--pencil);
}

.refer-link-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.refer-link-row input {
  flex: 1 1 20rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--input-bg);
  color: var(--ink);
}

.refer-progress { margin: 0.75rem 0 0; font-size: 0.95rem; }

.refer-feedback { margin: 0.75rem 0 0; font-size: 0.95rem; color: var(--correct-green); }

.refer-feedback--warn { color: var(--pen-red); }

/* ---------- Bubble grid ---------- */

.bubble-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  width: fit-content;
}

.bubble-grid--mini { grid-template-columns: repeat(8, 1fr); gap: 0.3rem; }

.bubble { width: 30px; height: 30px; display: block; }

.bubble-grid--mini .bubble { width: 16px; height: 16px; }

.bubble .bubble-outline {
  fill: var(--bubble-fill);
  stroke: var(--ink);
  stroke-width: 1.2;
}

.bubble .bubble-fill {
  stroke: var(--pencil);
  stroke-width: 1.6;
  stroke-dasharray: 47;
  stroke-dashoffset: 47;
  fill-opacity: 0;
  transition: stroke-dashoffset 0.3s ease-out, fill-opacity 0.3s ease-out 0.26s;
}

.bubble.filled .bubble-fill {
  stroke-dashoffset: 0;
  fill-opacity: 1;
}

/* ---------- Ledger table ---------- */

.ledger {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.ledger th,
.ledger td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--line); text-align: left; }

.ledger th {
  color: var(--pencil);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.ledger td:first-child { color: var(--pencil); }
.ledger .delta-pos { color: var(--correct-green); font-weight: 700; }
.ledger .delta-neg { color: var(--pen-red); font-weight: 700; }

.empty { color: var(--pencil); font-size: 0.95rem; margin: 0; }

/* ---------- Modal (sandbox rewarded ad) ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(30, 33, 40, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

.modal-backdrop.is-open { display: flex; }

.modal {
  background: var(--paper);
  border: 2px solid var(--ink);
  width: min(560px, 100%);
  box-shadow: 8px 8px 0 var(--shadow-soft);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line-strong);
  padding: 0.9rem 1.25rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 0.85rem;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--ink);
}

.modal-close:hover { color: var(--pen-red); }

.reward-frame {
  margin: 1.25rem;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  color: var(--paper);
  padding: 2rem 1.5rem;
  text-align: center;
  font-family: var(--font-mono);
}

.reward-frame .reward-label {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--reward-label);
  text-transform: uppercase;
}

.reward-frame .reward-video {
  display: block;
  width: 100%;
  max-height: 40vh;
  object-fit: contain;
  background: #000;
  border: 1px solid var(--line-strong);
  margin-bottom: 1rem;
}

.reward-frame .reward-image {
  display: block;
  width: 100%;
  max-height: 40vh;
  object-fit: contain;
  border: 1px solid var(--line-strong);
  margin-bottom: 1rem;
}

.reward-ring {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0.75rem auto;
}

.reward-ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.reward-ring-track {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 6;
}

.reward-ring-fg {
  fill: none;
  stroke: var(--pen-red);
  stroke-width: 6;
  stroke-linecap: round;
}

.reward-frame .reward-timer {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(2rem, 10vw, 3rem);
  font-weight: 700;
  margin: 0;
}

.reward-frame .reward-hint { font-size: 0.8rem; letter-spacing: 0.08em; color: var(--reward-hint); margin: 0; }

.reward-note {
  font-size: 0.85rem;
  color: var(--pencil);
  padding: 0 1.25rem 1rem;
  text-align: center;
  margin: 0;
}

.notice-body {
  padding-top: 1.25rem;
  padding-bottom: 1.5rem;
  max-width: 40ch;
  margin: 0 auto;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  padding: 0 1.25rem 1.25rem;
  justify-content: flex-end;
}

/* ---------- Browser chooser ---------- */

.modal--chooser { width: min(560px, 100%); }

.store-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  padding: 1.25rem;
}

@media (max-width: 420px) {
  .store-grid { grid-template-columns: 1fr; }
}

.store-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 1.5rem 1rem 1.25rem;
  background: transparent;
  border: 2px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  color: var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
}

.store-card:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--shadow-color); }

.store-card:active { transform: translate(0, 0); box-shadow: none; }

.store-logo {
  width: 2.75rem;
  height: 2.75rem;
  object-fit: contain;
  margin-bottom: 0.35rem;
}

.store-name {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 0.95rem;
}

.store-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--pencil);
}

.store-note {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--pencil);
}

/* ---------- Referral guide modal ---------- */

.referral-guide { padding: 1.25rem; }

.referral-guide > p:first-child {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--pencil);
}

.referral-guide .refer-steps { margin: 0 0 1.25rem; }

.referral-guide .refer-steps li { font-size: 0.95rem; }

.referral-guide .store-grid { padding: 0; }

.referral-note {
  margin: 1.25rem 0 0;
  font-size: 0.85rem;
  color: var(--pencil);
}

/* ---------- Privacy ---------- */

.privacy-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  margin: 0 0 0.25rem;
}

.privacy-title .pen { color: var(--pen-red); }

.prose { max-width: 44rem; }
.prose h2 { font-family: var(--font-mono); font-size: 1.1rem; margin: 2.25rem 0 0.5rem; letter-spacing: 0.04em; }
.prose h2 .num { color: var(--pen-red); margin-right: 0.6rem; }
.prose p { color: var(--pencil); margin: 0.5rem 0; }
.prose ul { color: var(--pencil); padding-left: 1.25rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line-strong);
  padding: 2.5rem 0 3rem;
  margin-top: 3rem;
}

.site-footer .foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
}

.site-footer nav a {
  color: var(--pencil);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  margin-right: 1.25rem;
}

.site-footer nav a:hover { color: var(--ink); text-decoration: underline; }

.foot-note { font-family: var(--font-mono); font-size: 0.72rem; color: var(--pencil); letter-spacing: 0.05em; margin: 0.5rem 0 0; }

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .bubble .bubble-fill { transition: none !important; }
  .confetti { display: none !important; }
}