/* ==========================================================================
   SAT Vocabulary Trainer — styles
   Two themes, both keyed off the same identity: the burgundy accent
   carried over from the source SATashkent PDF (the color used for every
   headword there was #8C1D2C on white). Dark is the default; Light
   restores something close to the original paper-and-ink palette. The
   toggle just swaps a data-theme attribute on <html> — every component
   below reads color from variables, never a hardcoded hex, so both
   themes stay in sync automatically. Green/amber/blue are additions not
   present in the source document — needed functionally to distinguish
   correct/incorrect feedback and mastery levels.
   ========================================================================== */

:root {
  /* Deep near-black with a cool undertone blended into the original
     warm charcoal — moodier and closer to a premium dashboard than flat
     brown-black, while keeping the same bookish burgundy identity. */
  --bg: #120F16;
  --bg-raised: #1C1720;
  --bg-sunk: #0B090D;
  --ink: #F3EDE4;
  --ink-soft: #CFC5B8;
  --muted: #96897A;
  --hairline: #2E2733;
  --hairline-strong: #453A4A;

  --accent: #E0616F;
  --accent-dark: #C4485A;
  --accent-darker: #A23A47;
  --accent-tint: rgba(224,97,111,0.14);
  --accent-tint-strong: rgba(224,97,111,0.26);
  --accent-glow: rgba(224,97,111,0.30);

  --success: #4FB679;
  --success-dark: #2F8F58;
  --success-tint: rgba(79,182,121,0.14);
  --amber: #E0A458;
  --amber-tint: rgba(224,164,88,0.14);
  --familiar: #6FA8D8;
  --familiar-tint: rgba(111,168,216,0.14);

  --topbar-bg: rgba(18,15,22,0.82);
  --overlay-bg: rgba(0,0,0,0.6);

  --glass-bg: rgba(255,255,255,0.035);
  --glass-border: rgba(255,255,255,0.09);
  --glass-blur: blur(16px);

  --serif: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-card: 0 1px 2px rgba(0,0,0,0.25), 0 8px 24px rgba(0,0,0,0.35);
  --shadow-pop: 0 16px 48px rgba(0,0,0,0.55);
  --shadow-glow: 0 0 0 1px var(--glass-border), 0 20px 60px -12px rgba(224,97,111,0.25);

  color-scheme: dark;
}

:root[data-theme="light"] {
  /* Restores the original palette sampled straight from the source
     PDF: white page, near-black ink, the burgundy at its true (darker,
     unbrightened) strength since it now sits on a light surface again. */
  --bg: #FFFFFF;
  --bg-raised: #FFFFFF;
  --bg-sunk: #FAF8F6;
  --ink: #1A1A1A;
  --ink-soft: #45403D;
  --muted: #6B6560;
  --hairline: #E4E1DC;
  --hairline-strong: #D2CCC5;

  --accent: #8C1D2C;
  --accent-dark: #6B1521;
  --accent-darker: #4E0F18;
  --accent-tint: #FBEEEE;
  --accent-tint-strong: #F3D9DA;
  --accent-glow: rgba(140,29,44,0.16);

  --success: #2E6B47;
  --success-dark: #235736;
  --success-tint: #EAF3EC;
  --amber: #96631A;
  --amber-tint: #FBF1E1;
  --familiar: #2A5A82;
  --familiar-tint: #EAF0F6;

  --topbar-bg: rgba(255,255,255,0.92);
  --overlay-bg: rgba(26,20,18,0.42);

  --glass-bg: rgba(26,20,18,0.03);
  --glass-border: rgba(26,20,18,0.08);
  --glass-blur: blur(16px);

  --shadow-card: 0 1px 2px rgba(26,20,18,0.04), 0 6px 20px rgba(26,20,18,0.05);
  --shadow-pop: 0 12px 40px rgba(26,20,18,0.14);
  --shadow-glow: 0 0 0 1px var(--glass-border), 0 20px 50px -16px rgba(140,29,44,0.16);

  color-scheme: light;
}

* { box-sizing: border-box; }

.hidden { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

.ambient-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.glow-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.55;
}
:root[data-theme="light"] .glow-blob { opacity: 0.35; }
.glow-blob--1 { width: 620px; height: 620px; top: -220px; right: -160px; }
.glow-blob--2 { width: 520px; height: 520px; bottom: -240px; left: -180px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; margin: 0; color: var(--ink); }

a { color: var(--accent); }

button { font-family: inherit; }

::selection { background: var(--accent-tint-strong); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

kbd {
  font-family: var(--sans);
  font-size: 0.72em;
  background: var(--bg-sunk);
  border: 1px solid var(--hairline-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05em 0.4em;
  color: var(--muted);
}

/* ---------- Topbar / nav ---------- */

.credit-bar {
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 7px 12px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-sunk);
}
.credit-bar strong { color: var(--ink-soft); font-weight: 700; }

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  background: var(--topbar-bg);
  backdrop-filter: saturate(140%) blur(6px);
  z-index: 40;
}

.topbar-actions { display: flex; align-items: center; gap: 8px; }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  background: transparent;
  padding: 4px;
  margin: -4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: background 0.15s ease;
}
.brand:hover { background: var(--bg-sunk); }

.brand-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  border-radius: 8px;
  display: block;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-title { font-family: var(--serif); font-weight: 700; font-size: 17px; color: var(--ink); }
.brand-sub { font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }

.tabs {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.2s ease;
}

.tab-icon { width: 15px; height: 15px; flex-shrink: 0; opacity: 0.85; }

.tab:hover { background: var(--bg-sunk); color: var(--ink); }

.tab.active {
  background: var(--accent-dark);
  color: #fff;
  box-shadow: 0 4px 16px -4px var(--accent-glow);
}

.icon-btn {
  border: 1px solid var(--hairline-strong);
  background: var(--bg-raised);
  color: var(--ink-soft);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Layout ---------- */

#app-root {
  flex: 1;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 24px 72px;
}

.view.hidden { display: none; }

@keyframes view-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.view.view--enter { animation: view-enter 0.32s cubic-bezier(0.22, 1, 0.36, 1); }

.view-head { margin-bottom: 22px; }
.view-head h1 { font-size: 28px; margin-bottom: 6px; }
.view-lede { color: var(--muted); font-size: 15px; margin: 0; }

/* ---------- Home ---------- */

@keyframes home-fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes home-logo-in {
  from { opacity: 0; transform: translateY(-8px) scale(0.85); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes home-logo-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-tint); }
  50% { box-shadow: 0 0 0 10px transparent; }
}

.home-hero {
  position: relative;
  text-align: center;
  padding: 30px 16px 20px;
  overflow: hidden;
}

.home-orbits {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.orbit-ring {
  position: absolute;
  border: 1px solid var(--accent-tint-strong);
  border-radius: 50%;
  opacity: 0.5;
}
.orbit-ring--1 { width: 620px; height: 300px; top: -40px; left: 50%; transform: translateX(-50%) rotate(-6deg); }
.orbit-ring--2 { width: 420px; height: 420px; top: 30px; left: 50%; transform: translateX(-50%); }

.home-logo {
  display: block;
  width: 60px;
  height: 60px;
  border-radius: 15px;
  margin: 0 auto 12px;
  opacity: 0;
  position: relative;
  z-index: 1;
}

.home-badge, .home-title, .home-tagline, .home-cta, .home-stat-box {
  opacity: 0;
  position: relative;
  z-index: 1;
}

/* Re-triggerable entrance: app.js toggles this class off/on each time
   the Home view is shown, so returning to the homepage replays it
   rather than it only ever firing once on first page load. */
.home-hero.is-visible .home-logo {
  animation: home-logo-in 0.5s cubic-bezier(0.22, 1, 0.36, 1) 0.05s both,
             home-logo-glow 3.2s ease-in-out 0.6s infinite;
}
.home-hero.is-visible .home-badge { animation: home-fade-up 0.5s ease 0.1s both; }
.home-hero.is-visible .home-title { animation: home-fade-up 0.5s ease 0.16s both; }
.home-hero.is-visible .home-tagline { animation: home-fade-up 0.5s ease 0.24s both; }
.home-hero.is-visible .home-cta { animation: home-fade-up 0.5s ease 0.32s both; }
.home-hero.is-visible .home-stat-box { animation: home-fade-up 0.5s ease 0.4s both; }

.home-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--muted);
  background: var(--accent-tint);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 12px;
}
.home-badge svg { width: 12px; height: 12px; color: var(--accent); flex-shrink: 0; }
.home-badge strong { color: var(--ink-soft); font-weight: 700; }

.home-title {
  font-size: clamp(42px, 5.4vw, 76px);
  line-height: 1.0;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.home-title-accent { color: var(--accent); position: relative; display: inline-block; }
.home-title-accent::after {
  content: '';
  position: absolute;
  left: 2%;
  right: 2%;
  bottom: -0.08em;
  height: 0.09em;
  background: var(--accent);
  opacity: 0.35;
  border-radius: 999px;
  transform: rotate(-0.6deg);
}
.home-title-dot { color: var(--accent); }

.home-tagline {
  max-width: 620px;
  margin: 0 auto 22px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.55;
}

.home-cta {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.home-stat-box {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--hairline-strong);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.home-stat {
  padding: 16px 26px;
  border-right: 1px solid var(--hairline);
  transition: transform 0.2s ease;
}
.home-stat:last-child { border-right: none; }
.home-stat span {
  display: block;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  transition: transform 0.2s ease;
}
.home-stat:hover span { transform: scale(1.08); }
.home-stat label { font-size: 11.5px; color: var(--muted); white-space: nowrap; }
@media (max-width: 480px) {
  .home-stat-box { flex-direction: column; }
  .home-stat { border-right: none; border-bottom: 1px solid var(--hairline); }
  .home-stat:last-child { border-bottom: none; }
}

/* ---------- Why SAT Verbatim ---------- */

.why-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1100px;
  margin: 8px auto 44px;
}
@media (max-width: 780px) {
  .why-section { grid-template-columns: 1fr; gap: 32px; text-align: center; }
}

.why-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 10px;
}
.why-label svg { width: 12px; height: 12px; }

.why-text h2 { font-size: clamp(28px, 3.2vw, 40px); line-height: 1.15; margin-bottom: 16px; }
.why-accent { color: var(--accent); position: relative; display: inline-block; }
.why-accent::after {
  content: '';
  position: absolute;
  left: 1%;
  right: 1%;
  bottom: -0.06em;
  height: 0.07em;
  background: var(--accent);
  opacity: 0.35;
  border-radius: 999px;
}
.why-text p { color: var(--muted); font-size: 16px; line-height: 1.7; margin: 0; max-width: 460px; }
@media (max-width: 780px) { .why-text p { margin: 0 auto; } }

.why-visual { position: relative; display: flex; justify-content: center; }

.mini-dashboard {
  width: 100%;
  background: #17141B;
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow-pop);
  color: #F3EDE4;
  text-align: left;
}
.mini-dash-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.mini-dash-title { font-weight: 700; font-size: 15px; margin-bottom: 3px; }
.mini-dash-sub { font-size: 11.5px; color: rgba(255,255,255,0.55); }
.mini-dash-ring { position: relative; width: 44px; height: 44px; flex-shrink: 0; text-align: center; }
.mini-dash-ring svg { width: 44px; height: 44px; }
.mini-dash-ring circle#mini-dash-ring-fill { transition: stroke-dashoffset 0.8s cubic-bezier(0.22, 1, 0.36, 1); }
.mini-dash-ring span {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -55%);
  font-size: 13px;
  font-weight: 700;
}
.mini-dash-ring label {
  position: absolute;
  bottom: -14px; left: 50%;
  transform: translateX(-50%);
  font-size: 8px;
  color: rgba(255,255,255,0.5);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.mini-dash-goal { border-top: 1px solid rgba(255,255,255,0.1); border-bottom: 1px solid rgba(255,255,255,0.1); padding: 14px 0; margin-bottom: 16px; }
.mini-dash-goal-row { display: flex; justify-content: space-between; font-size: 12px; margin-bottom: 8px; }
.mini-dash-goal-row span:first-child { color: rgba(255,255,255,0.65); }
.mini-dash-goal-row span:last-child { font-weight: 700; }
.mini-dash-goal-bar { height: 6px; border-radius: 999px; background: rgba(255,255,255,0.12); overflow: hidden; }
.mini-dash-goal-bar > div { height: 100%; background: #6FA8D8; border-radius: 999px; transition: width 0.6s ease; }
.mini-dash-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; text-align: center; }
.mini-dash-stats span { display: block; font-weight: 700; font-size: 16px; }
.mini-dash-stats label { font-size: 9.5px; color: rgba(255,255,255,0.55); line-height: 1.3; }

.sticky-note {
  position: absolute;
  left: -10px;
  bottom: -14px;
  background: #FBF0C9;
  color: #4a3f1a;
  font-family: var(--serif);
  font-style: italic;
  font-size: 12.5px;
  line-height: 1.35;
  padding: 10px 14px;
  border-radius: 4px;
  box-shadow: var(--shadow-card);
  transform: rotate(-4deg);
}

.home-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  max-width: 1100px;
  margin: 8px auto 44px;
}
@media (max-width: 720px) {
  .home-features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 460px) {
  .home-features { grid-template-columns: 1fr; }
}

.home-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  opacity: 0;
}
.home-features.is-visible .home-feature:nth-child(1) { animation: home-fade-up 0.5s ease 0.44s both; }
.home-features.is-visible .home-feature:nth-child(2) { animation: home-fade-up 0.5s ease 0.5s both; }
.home-features.is-visible .home-feature:nth-child(3) { animation: home-fade-up 0.5s ease 0.56s both; }
.home-features.is-visible .home-feature:nth-child(4) { animation: home-fade-up 0.5s ease 0.62s both; }

.home-feature-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--accent-tint);
  color: var(--accent);
}
.home-feature-icon svg { width: 18px; height: 18px; }
.home-feature h3 { font-size: 16px; margin-bottom: 4px; }
.home-feature p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.45; }

/* ---------- Bottom CTA banner ---------- */

.home-cta-banner {
  position: relative;
  max-width: 1100px;
  margin: 0 auto 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--accent-darker), var(--accent-dark));
  padding: 40px 36px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: center;
  overflow: hidden;
}
@media (max-width: 680px) {
  .home-cta-banner { grid-template-columns: 1fr; text-align: center; padding: 32px 24px; }
}

.cta-quote-card {
  background: rgba(0,0,0,0.18);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  max-width: 220px;
}
.cta-quote-mark { font-family: var(--serif); font-size: 34px; color: rgba(255,255,255,0.5); line-height: 1; display: block; margin-bottom: 6px; }
.cta-quote-card p { color: #fff; font-family: var(--serif); font-weight: 700; font-size: 17px; line-height: 1.35; margin: 0; }
.cta-quote-card em { color: rgba(255,255,255,0.85); font-style: italic; }

.cta-banner-text h2 { color: #fff; font-size: clamp(24px, 2.6vw, 32px); margin-bottom: 8px; }
.cta-banner-text p { color: rgba(255,255,255,0.75); font-size: 16px; margin: 0 0 20px; }

.btn-cta-white {
  background: #fff;
  color: var(--accent-darker);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: 14.5px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-cta-white:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.25); }


@keyframes chip-float {
  0% { transform: translateY(0); opacity: 0; }
  8% { opacity: 0.5; }
  92% { opacity: 0.5; }
  100% { transform: translateY(-340px); opacity: 0; }
}

.home-chips {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.home-chip {
  position: absolute;
  bottom: -20px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--muted);
  opacity: 0;
  white-space: nowrap;
  animation-name: chip-float;
  animation-timing-function: ease-in;
  animation-iteration-count: infinite;
}

.home-hero > *:not(.home-chips) { position: relative; z-index: 1; }

/* ---------- Streak badge ---------- */

@keyframes flame-flicker {
  0%, 100% { transform: scale(1) rotate(-2deg); }
  50% { transform: scale(1.12) rotate(2deg); }
}

.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--amber);
  background: var(--amber-tint);
  border-radius: 999px;
  padding: 5px 14px 5px 10px;
  margin-bottom: 18px;
}
.streak-flame { display: inline-block; animation: flame-flicker 1.6s ease-in-out infinite; }

/* ---------- Word of the Day + welcome-back cards ---------- */

.home-secondary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  max-width: 680px;
  margin: 0 auto 8px;
  padding: 0 16px;
}
@media (max-width: 620px) { .home-secondary { grid-template-columns: 1fr; } }
.home-secondary:has(.welcome-card.hidden) { grid-template-columns: 1fr; max-width: 420px; }

.welcome-card {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  text-align: left;
  display: flex;
  flex-direction: column;
}

.wotd-card {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  text-align: left;
  overflow: hidden;
}

.wotd-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  border: none;
  background: transparent;
  color: var(--ink);
  padding: 16px 20px;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: background 0.15s ease;
}
.wotd-toggle:hover { background: var(--bg-sunk); }
.wotd-toggle-icon { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; }
.wotd-toggle-icon svg { width: 100%; height: 100%; }
.wotd-toggle-label {
  flex: 1;
  font-size: 12.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.wotd-chevron { width: 16px; height: 16px; color: var(--muted); flex-shrink: 0; transition: transform 0.25s ease; }
.wotd-chevron svg { width: 100%; height: 100%; }
.wotd-toggle[aria-expanded="true"] .wotd-chevron { transform: rotate(180deg); }

.wotd-collapse {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.wotd-collapse.is-open { grid-template-rows: 1fr; }
.wotd-collapse-inner { overflow: hidden; }

.wotd-word {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  color: var(--accent);
  margin: 0 20px 4px;
}
.wotd-def {
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.45;
  margin: 0 20px 8px;
}
.wotd-tier {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--familiar);
  background: var(--familiar-tint);
  padding: 2px 8px;
  border-radius: 999px;
  margin: 0 20px 18px;
}

.welcome-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 8px;
}
.welcome-text { font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; margin: 0 0 12px; flex: 1; }
.btn-sm { padding: 7px 14px; font-size: 13px; align-self: flex-start; }

/* ---------- Confetti ---------- */

@keyframes confetti-fall {
  0% { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
}

.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 300;
  overflow: hidden;
}
.confetti-piece {
  position: absolute;
  top: -20px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  animation-name: confetti-fall;
  animation-timing-function: cubic-bezier(0.4, 0, 0.6, 1);
  animation-fill-mode: forwards;
}

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

.site-footer {
  border-top: 1px solid var(--hairline);
  margin-top: 24px;
  padding: 28px 20px 32px;
}

.footer-inner {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.footer-mark {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  flex-shrink: 0;
}

.footer-copyright {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.footer-contact {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.footer-contact:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Study (browse) ---------- */

.study-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.study-controls input,
.study-controls select {
  font-family: var(--sans);
  font-size: 14.5px;
  padding: 10px 12px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  color: var(--ink);
}
.study-controls input::placeholder { color: var(--muted); }

.study-controls input[type="search"] { flex: 1; min-width: 180px; }

.study-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.study-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-raised);
  transition: background 0.12s ease;
}
.study-item:last-child { border-bottom: none; }
.study-item:hover { background: var(--bg-sunk); }

.study-item .sw-word {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--accent);
  min-width: 150px;
  flex-shrink: 0;
  font-size: 16.5px;
}

.study-item .sw-def {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.45;
  flex: 1;
}

.sw-badge {
  flex-shrink: 0;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.sw-badge.new { background: var(--bg-sunk); color: var(--muted); }
.sw-badge.learning { background: var(--amber-tint); color: var(--amber); }
.sw-badge.review { background: var(--accent-tint); color: var(--accent); }
.sw-badge.familiar { background: var(--familiar-tint); color: var(--familiar); }
.sw-badge.mastered { background: var(--success-tint); color: var(--success); }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}
.empty-state.hidden { display: none; }

/* ---------- Quiz launcher ---------- */

.launcher {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
  padding: 16px 20px 20px;
}

.launcher-stats {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin: 24px 0 28px;
}

.stat-pill {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  padding: 16px 22px;
  min-width: 140px;
}
.stat-pill span {
  display: block;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
}
.stat-pill label { font-size: 12.5px; color: var(--muted); }

.direction-toggle {
  display: inline-flex;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  padding: 3px;
  margin-bottom: 24px;
  background: var(--bg-sunk);
  gap: 2px;
}

.direction-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.direction-btn:hover { color: var(--ink); }
.direction-btn.active { background: var(--accent-dark); color: #fff; }

@media (max-width: 480px) {
  .direction-toggle { flex-wrap: wrap; justify-content: center; border-radius: var(--radius-md); }
  .direction-btn { padding: 7px 12px; font-size: 12px; }
}

.launcher-section {
  max-width: 480px;
  margin: 0 auto 24px;
  text-align: center;
}
.launcher-section-label {
  display: block;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 10px;
}
.launcher-section .direction-toggle { margin-bottom: 10px; }

.direction-explain {
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.5;
  margin: 0;
  padding: 0 8px;
}

.length-picker {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  padding: 3px;
  background: var(--bg-sunk);
  gap: 2px;
  flex-wrap: wrap;
  justify-content: center;
}
.length-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.length-btn:hover { color: var(--ink); }
.length-btn.active { background: var(--accent-dark); color: #fff; }

.length-custom { display: inline-flex; }
.length-custom input {
  width: 74px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 999px;
  text-align: center;
}
.length-custom input:focus,
.length-custom input.active {
  background: var(--accent-dark);
  color: #fff;
}
.length-custom input::placeholder { color: var(--muted); }

.launcher-hint {
  max-width: 420px;
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
}

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

.btn {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  padding: 11px 20px;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--accent-dark); color: #fff; }
.btn-primary:hover { background: var(--accent-darker); }

.btn-lg { padding: 13px 28px; font-size: 15.5px; }

.btn-ghost { background: transparent; color: var(--ink-soft); border-color: var(--hairline-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-danger { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-danger:hover { background: var(--accent-dark); color: #fff; }

.btn kbd { background: rgba(255,255,255,0.18); color: inherit; border-color: rgba(255,255,255,0.35); }
.btn-ghost kbd { background: var(--bg-sunk); color: var(--muted); border-color: var(--hairline-strong); }

/* ---------- Active session ---------- */

#session-active, #session-summary, #session-empty {
  max-width: 920px;
  margin: 0 auto;
}

.session-progress { margin-bottom: 26px; }

.session-progress-bar {
  height: 6px;
  background: var(--bg-sunk);
  border-radius: 999px;
  overflow: hidden;
}
.session-progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s ease;
}
.session-progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}
.session-progress-label {
  font-size: 12.5px;
  color: var(--muted);
}
.session-streak {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--amber);
  background: var(--amber-tint);
  padding: 3px 10px;
  border-radius: 999px;
}

.question-timer {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--ink-soft);
  background: var(--bg-sunk);
  border: 1px solid var(--hairline-strong);
  padding: 3px 11px 3px 8px;
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
}
.question-timer svg { width: 13px; height: 13px; flex-shrink: 0; color: var(--muted); }

.review-timing {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.review-timing-stat {
  border: 1px solid var(--hairline);
  background: var(--bg-raised);
  border-radius: var(--radius-md);
  padding: 12px 8px;
  text-align: center;
}
.review-timing-stat span {
  display: block;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.review-timing-stat label { font-size: 10.5px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; }
@media (max-width: 480px) { .review-timing { grid-template-columns: repeat(2, 1fr); } }

.review-time {
  flex-shrink: 0;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg-sunk);
  padding: 2px 8px;
  border-radius: 999px;
  align-self: flex-start;
  font-variant-numeric: tabular-nums;
}

.qcard {
  text-align: center;
  padding: 12px 8px 8px;
}

@keyframes qcard-enter {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.qcard.qcard--enter { animation: qcard-enter 0.28s ease; }

.qcard-eyebrow {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 10px;
}

.qcard-word {
  font-size: clamp(36px, 8vw, 52px);
  color: var(--ink);
  margin-bottom: 30px;
  letter-spacing: -0.01em;
}

.qcard-word.qcard-word--definition {
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 500;
  font-style: italic;
  line-height: 1.4;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: 0;
}

.options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  text-align: left;
}

@media (max-width: 620px) {
  .options { grid-template-columns: 1fr; }
}

.qcard-tip {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  max-width: 700px;
  margin: 24px auto 0;
  padding: 14px 18px;
  background: var(--accent-tint);
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.5;
  text-align: left;
}
.qcard-tip svg { width: 17px; height: 17px; flex-shrink: 0; color: var(--accent); margin-top: 1px; }
.qcard-tip strong { color: var(--accent); }

.quiz-footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
}
.qfb-streak {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-soft);
  font-weight: 600;
  white-space: nowrap;
}
.qfb-streak strong { color: var(--amber); font-size: 14px; }
.qfb-message { flex: 1; min-width: 220px; text-align: center; color: var(--muted); margin: 0; }
.qfb-message strong { color: var(--accent); }
.qfb-progress {
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  padding: 6px 14px;
  color: var(--muted);
  white-space: nowrap;
}
.qfb-progress strong { color: var(--ink); }
@media (max-width: 620px) {
  .quiz-footer-bar { justify-content: center; text-align: center; }
  .qfb-message { order: 3; width: 100%; }
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 14px 16px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.45;
  color: var(--ink-soft);
  text-align: left;
  transition: border-color 0.12s ease, background 0.12s ease, transform 0.08s ease, box-shadow 0.12s ease;
}

.option:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-tint);
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}
.option:active:not(:disabled) { transform: translateY(1px); }

.option-letter {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--hairline-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12.5px;
  color: var(--muted);
}

.option.is-correct {
  border-color: var(--success);
  background: var(--success-tint);
  color: var(--ink);
}
.option.is-correct .option-letter { border-color: var(--success); background: var(--success-dark); color: #fff; }

.option.is-incorrect {
  border-color: var(--accent);
  background: var(--accent-tint);
  color: var(--ink);
}
.option.is-incorrect .option-letter { border-color: var(--accent); background: var(--accent-dark); color: #fff; }

.option:disabled { cursor: default; }
.option:disabled:not(.is-correct):not(.is-incorrect) { opacity: 0.55; }

/* ---------- Feedback panel ---------- */

.feedback-panel { margin-top: 26px; }
.feedback-panel.hidden { display: none; }

.feedback-banner {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 20px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}
.feedback-banner.correct { background: var(--success-tint); color: var(--success); }
.feedback-banner.incorrect { background: var(--accent-tint); color: var(--accent); }

.feedback-detail { margin-bottom: 20px; }

.fd-block {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 12px;
}

.fd-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}

.fd-word { font-family: var(--serif); font-weight: 700; color: var(--ink); }

.fd-options { display: flex; flex-direction: column; gap: 10px; }

.fd-option-row {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.45;
}
.fd-option-row .letter {
  font-weight: 700;
  color: var(--muted);
  flex-shrink: 0;
}
.fd-option-row.correct .letter,
.fd-option-row.correct .word { color: var(--success); }
.fd-option-row.chosen-wrong .letter,
.fd-option-row.chosen-wrong .word { color: var(--accent); }
.fd-option-row .word { font-weight: 700; color: var(--ink); }

/* ---------- Session summary ---------- */

.session-summary { text-align: center; padding: 40px 12px; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 26px 0;
}
@media (max-width: 560px) { .summary-grid { grid-template-columns: 1fr; } }

.summary-stat {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  padding: 18px 10px;
}
.summary-stat span { display: block; font-family: var(--serif); font-size: 28px; font-weight: 700; color: var(--accent); }
.summary-stat label { font-size: 12px; color: var(--muted); }

.summary-note { color: var(--muted); font-size: 14px; margin-bottom: 24px; }

.session-review {
  text-align: left;
  margin-bottom: 28px;
}

.summary-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ---------- Progress dashboard ---------- */

.progress-top-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
  align-items: stretch;
}
@media (max-width: 680px) { .progress-top-grid { grid-template-columns: 1fr; } }

.progress-headline { display: flex; flex-direction: column; justify-content: center; }
.progress-eyebrow { font-size: 14px; color: var(--muted); margin: 0 0 6px; }
.progress-headline-title {
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.25;
  margin: 0;
}
.progress-headline-title em { color: var(--accent); font-style: italic; }

.overall-progress-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  background: linear-gradient(155deg, var(--accent-dark), var(--accent-darker));
  color: #fff;
  box-shadow: var(--shadow-pop);
}
.opc-sparkle {
  position: absolute;
  top: 16px;
  right: 18px;
  width: 20px;
  height: 20px;
  color: rgba(255,255,255,0.55);
}
.opc-sparkle svg { width: 100%; height: 100%; }
.opc-label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  margin-bottom: 16px;
}
.opc-label svg { width: 14px; height: 14px; color: #fff; }

.opc-body { display: flex; align-items: center; gap: 22px; }

.opc-ring { position: relative; width: 96px; height: 96px; flex-shrink: 0; }
.opc-ring svg { width: 100%; height: 100%; }
#opc-ring-fill { transition: stroke-dashoffset 0.9s cubic-bezier(0.22, 1, 0.36, 1); }
.opc-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
}

.opc-figures { display: flex; flex-direction: column; gap: 12px; }
.opc-figures strong { display: block; font-family: var(--serif); font-size: 19px; font-weight: 700; }
.opc-figures span { font-size: 12px; color: rgba(255,255,255,0.75); }

.opc-footer {
  margin: 16px 0 0;
  font-size: 12px;
  color: rgba(255,255,255,0.8);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}
@media (max-width: 640px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }

.stat-card {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  padding: 16px 12px;
  text-align: center;
  transition: border-color 0.15s ease, transform 0.1s ease, box-shadow 0.2s ease;
}
.stat-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.stat-card span { display: block; font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--ink); }
.stat-card label { font-size: 11.5px; color: var(--muted); }
.stat-card--mastered { border-color: var(--success); }
.stat-card--mastered span { color: var(--success); }

.stat-card--icon {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  padding: 14px 14px;
}
.stat-card-text { min-width: 0; }
.stat-card-text span { font-size: 19px; }
.stat-card-text small { display: block; font-size: 10.5px; color: var(--muted); font-weight: 600; }

.stat-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stat-icon svg { width: 17px; height: 17px; }
.stat-icon--accent { background: var(--accent-tint); color: var(--accent); }
.stat-icon--success { background: var(--success-tint); color: var(--success); }
.stat-icon--familiar { background: var(--familiar-tint); color: var(--familiar); }
.stat-icon--amber { background: var(--amber-tint); color: var(--amber); }

.mastery-note {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.5;
  margin: 0 0 28px;
}

/* ---------- Profile header ---------- */

.profile-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.profile-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-dark);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 20px;
  flex-shrink: 0;
}

.profile-identity h1 { font-size: 22px; margin-bottom: 4px; }

.profile-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.profile-rank {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 3px 10px;
  border-radius: 999px;
}

.profile-since { font-size: 12.5px; color: var(--muted); }

/* ---------- Dashboard grid (tier bars + achievements) ---------- */

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
@media (max-width: 680px) { .dashboard-grid { grid-template-columns: 1fr; } }

.dashboard-panel {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-glow);
}
.dashboard-panel h2 { font-size: 15px; margin-bottom: 14px; }
.dashboard-panel--wide { margin-bottom: 16px; }

.chart-panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 4px;
}
.chart-panel-head h2 { margin-bottom: 0; }
.chart-legend { font-size: 11.5px; color: var(--muted); }

.performance-chart { margin-top: 8px; }
.chart-empty { font-size: 13px; color: var(--muted); margin: 12px 0 4px; }

.chart-svg { width: 100%; height: auto; display: block; overflow: visible; }

@keyframes chart-line-draw {
  from { stroke-dashoffset: 2000; }
  to { stroke-dashoffset: 0; }
}
.chart-line {
  stroke-dasharray: 2000;
  animation: chart-line-draw 1.1s cubic-bezier(0.22, 1, 0.36, 1) both;
}
@keyframes chart-area-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
.chart-area { animation: chart-area-fade 1.1s ease 0.3s both; }

.chart-dot {
  fill: var(--bg-raised);
  stroke: var(--accent);
  stroke-width: 2;
  transition: r 0.15s ease;
}
.chart-dot:hover { r: 6; }

.chart-x-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--muted);
  margin-top: 6px;
  padding: 0 2px;
}

.tier-bars { display: flex; flex-direction: column; gap: 12px; }

.tier-table-head {
  display: grid;
  grid-template-columns: 70px 90px 1fr 60px;
  gap: 10px;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  padding-bottom: 8px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--hairline);
}
.tier-table-acc { text-align: right; }

.tier-row {
  display: grid;
  grid-template-columns: 70px 90px 1fr 60px;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
}
.tier-label { font-size: 13px; font-weight: 600; color: var(--ink-soft); }
.tier-count { font-size: 12.5px; color: var(--muted); }
.tier-track { height: 7px; border-radius: 999px; background: var(--bg-sunk); overflow: hidden; }
.tier-fill { display: block; height: 100%; border-radius: 999px; }
.tier-fill--medium { background: var(--amber); }
.tier-fill--hard { background: var(--accent); }
.tier-fill--expert { background: var(--familiar); }
.tier-acc { text-align: right; font-size: 12.5px; color: var(--muted); font-weight: 600; }

.dashboard-panel-lede { font-size: 12px; color: var(--muted); margin: -6px 0 12px; }

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
@media (max-width: 420px) { .achievements-grid { grid-template-columns: 1fr; } }

.achievement {
  display: flex;
  align-items: flex-start;
  text-align: left;
  gap: 10px;
  padding: 10px 8px;
  border-radius: var(--radius-md);
}
.achievement-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  background: var(--bg-sunk);
}
.achievement.is-unlocked .achievement-icon { background: var(--amber-tint); }
.achievement.is-locked { opacity: 0.6; }
.achievement-text { min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.achievement-name { display: block; font-size: 12.5px; font-weight: 700; color: var(--ink); }
.achievement-desc { display: block; font-size: 11px; color: var(--muted); line-height: 1.35; }

/* ---------- Session log ---------- */

.session-log { display: flex; flex-direction: column; gap: 2px; }
.session-log-empty { font-size: 13px; color: var(--muted); margin: 4px 0; }

.session-log-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--hairline);
  font-size: 13px;
}
.session-log-row:last-child { border-bottom: none; }
.sl-mode {
  font-weight: 700;
  color: var(--accent);
  width: 56px;
  flex-shrink: 0;
}
.sl-detail { flex: 1; color: var(--ink-soft); }
.sl-date { color: var(--muted); font-size: 12px; flex-shrink: 0; }

/* ---------- Session review (end-of-session detail) ---------- */

.session-review { text-align: left; margin: 28px 0; }

.review-section { margin-bottom: 20px; }
.review-section h3 {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.review-count {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg-sunk);
  padding: 1px 8px;
  border-radius: 999px;
}

.review-list { display: flex; flex-direction: column; gap: 8px; }

.review-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  text-align: left;
  font-size: 13.5px;
}
.review-row--missed { border-color: var(--accent); background: var(--accent-tint); }
.review-row--correct { border-color: var(--success); background: var(--success-tint); }
.review-icon {
  flex-shrink: 0;
  font-weight: 700;
  width: 18px;
  text-align: center;
}
.review-row--missed .review-icon { color: var(--accent); }
.review-row--correct .review-icon { color: var(--success); }
.review-row-text { flex: 1; line-height: 1.45; }
.review-word { font-family: var(--serif); font-weight: 700; color: var(--ink); }
.review-chosen { color: var(--muted); font-size: 12.5px; margin-top: 3px; }

.mastery-breakdown h2 { font-size: 17px; margin-bottom: 14px; }

.mastery-breakdown-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
}
@media (max-width: 780px) {
  .mastery-breakdown-row { grid-template-columns: 1fr; justify-items: center; }
}

.donut-wrap { position: relative; width: 140px; height: 140px; flex-shrink: 0; }
.donut-ring {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-sunk);
  transition: background 0.6s ease;
}
.donut-center {
  position: absolute;
  inset: 22px;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.donut-center strong { font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--ink); }
.donut-center span { font-size: 10.5px; color: var(--muted); }

.breakdown-bars { display: flex; flex-direction: column; gap: 10px; min-width: 220px; }
.breakdown-row { display: flex; align-items: center; gap: 10px; }
.b-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.breakdown-row .b-label { width: 88px; flex-shrink: 0; font-size: 12.5px; color: var(--ink-soft); font-weight: 600; }
.breakdown-row .b-track { flex: 1; height: 7px; border-radius: 999px; background: var(--bg-sunk); overflow: hidden; }
.breakdown-row .b-fill { height: 100%; border-radius: 999px; }
.breakdown-row .b-count { width: 78px; text-align: right; font-size: 12px; color: var(--muted); flex-shrink: 0; }
.breakdown-row .b-count em { font-style: normal; color: var(--muted); }

.mastery-motivate {
  width: 160px;
  flex-shrink: 0;
  text-align: center;
  padding: 16px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-sunk);
}
.mastery-motivate svg { width: 56px; height: 44px; color: var(--accent); margin-bottom: 8px; }
.mastery-motivate p { margin: 0; font-size: 12px; color: var(--ink-soft); line-height: 1.4; }
.mastery-motivate strong { color: var(--accent); }

.recent-sessions-row { display: flex; align-items: center; gap: 20px; }
.recent-sessions-row .session-log { flex: 1; }
.recent-sessions-art { flex-shrink: 0; color: var(--hairline-strong); width: 90px; height: 70px; display: none; }
.recent-sessions-art svg { width: 100%; height: 100%; }
@media (min-width: 560px) { .recent-sessions-art { display: block; } }

/* ---------- Modal ---------- */

.modal {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal.hidden { display: none; }

.modal-card {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 26px 26px 20px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-pop);
}
.modal-card h2 { font-size: 20px; margin-bottom: 14px; }
.modal-card p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.5; }

.settings-row { margin-bottom: 18px; }
.settings-row label { display: block; font-weight: 700; font-size: 13.5px; margin-bottom: 6px; }
.settings-row input[type="number"] {
  width: 100px;
  padding: 8px 10px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunk);
  color: var(--ink);
  font-size: 14px;
}
.settings-help { color: var(--muted); font-size: 13px; margin: 4px 0 0; }

.name-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunk);
  color: var(--ink);
  font-size: 15px;
  font-family: inherit;
  box-sizing: border-box;
}
.name-input:focus { border-color: var(--accent); }
#name-form .modal-actions { margin-top: 16px; }

.level-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}
.level-check {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-soft);
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  padding: 5px 12px 5px 8px;
  cursor: pointer;
}
.level-check input { accent-color: var(--accent); cursor: pointer; }
.settings-danger { border-top: 1px solid var(--hairline); padding-top: 16px; }
.settings-danger .btn { margin-top: 10px; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--bg);
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  box-shadow: var(--shadow-pop);
  z-index: 200;
}
.toast.hidden { display: none; }

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

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }

  /* The homepage entrance animation is also what sets these elements
     to their final opacity: 1 — disabling the animation above without
     this would leave the entire homepage invisible for anyone with
     this preference set, rather than just skipping the animation. */
  .home-logo, .home-title, .home-tagline, .home-stats, .home-cta, .home-feature {
    opacity: 1!important;
  }
}

/* ---------- Small screens ---------- */

@media (max-width: 480px) {
  .topbar { padding: 12px 14px; gap: 12px; }
  .brand-sub { display: none; }
  .tabs { gap: 2px; }
  .tab { padding: 8px; font-size: 13px; }
  .tab span { display: none; }
  .tab-icon { width: 17px; height: 17px; }
  #app-root { padding: 22px 14px 60px; }
  .qcard-word { margin-bottom: 22px; }
}