:root {
  color-scheme: dark;
  --bg: radial-gradient(circle at 30% 20%, #0a2a3f, #02050a 70%);
  --panel: rgba(18, 28, 48, 0.72);
  --panel-top: rgba(34, 71, 120, 0.72);
  --panel-bottom: rgba(9, 18, 35, 0.92);
  --line: rgba(0, 234, 255, 0.22);
  --text: #e6f2ff;
  --muted: #9fb3c8;
  --gold: #d9e4ef;
  --orange: #00eaff;
  --red: #ff4d6d;
  --blue: #007fff;
  --cyan: #00eaff;
  --green: #00ffa6;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  --glow: 0 0 18px rgba(0, 234, 255, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  color: inherit;
  cursor: pointer;
}

.app-shell {
  min-height: 100dvh;
  padding: calc(env(safe-area-inset-top) + 18px) 14px calc(env(safe-area-inset-bottom) + 18px);
  background:
    radial-gradient(circle at 82% 12%, rgba(14, 165, 233, 0.14), transparent 30%),
    linear-gradient(180deg, #02050a 0%, #05070d 48%, #02050a 100%);
}

.screen {
  width: min(760px, 100%);
  min-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 36px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 66px;
  display: grid;
  grid-template-columns: 56px 1fr 56px;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.title {
  margin: 0;
  text-align: center;
  font-size: clamp(1.24rem, 5vw, 1.9rem);
  font-weight: 800;
  line-height: 1.1;
}

.icon-button {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 127, 255, 0.35), rgba(2, 5, 10, 0.85));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  color: var(--silver);
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.icon-button:hover,
.icon-button:active {
  transform: scale(1.06);
  box-shadow: var(--glow);
  color: var(--cyan);
}

.icon-button svg {
  width: 30px;
  height: 30px;
  stroke: currentColor;
  stroke-width: 2.4;
  fill: none;
}

.icon-button.gold {
  color: var(--cyan);
  border-color: rgba(0, 234, 255, 0.35);
}


.hero-stat {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px;
  align-items: start;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.stat-card span {
  font-size: 0.72rem;
  letter-spacing: 0.5px;
  opacity: 0.8;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 15px rgba(0, 234, 255, 0.2); }
  50% { box-shadow: 0 0 28px rgba(0, 234, 255, 0.4); }
  100% { box-shadow: 0 0 15px rgba(0, 234, 255, 0.2); }
}

@keyframes ringBreath {
  0% { filter: drop-shadow(0 0 4px rgba(0, 234, 255, 0.2)); }
  50% { filter: drop-shadow(0 0 13px rgba(0, 234, 255, 0.42)); }
  100% { filter: drop-shadow(0 0 4px rgba(0, 234, 255, 0.2)); }
}

.stat-ring {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto 6px;
  background: conic-gradient(var(--cyan) 0deg, rgba(255,255,255,0.08) 0deg);
  box-shadow: 0 0 18px rgba(0, 234, 255, 0.22), inset 0 0 18px rgba(255, 255, 255, 0.04);
  animation: pulseGlow 3s infinite ease-in-out, ringBreath 4.2s infinite ease-in-out;
  transition: background 1.2s ease;
}

.stat-ring.readiness-ready {
  background: conic-gradient(var(--green) var(--value), rgba(255,255,255,0.08) 0);
}

.stat-ring.readiness-close {
  background: conic-gradient(var(--cyan) var(--value), rgba(255,255,255,0.08) 0);
}

.stat-ring.readiness-build {
  background: conic-gradient(#ffb84d var(--value), rgba(255,255,255,0.08) 0);
}

.stat-ring:active {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(0, 234, 255, 0.4);
}

.stat-ring-inner {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(2, 5, 10, 0.88);
  border: 1px solid rgba(255,255,255,0.12);
}

.stat-ring strong {
  font-size: 1.05rem;
  font-weight: 700;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  padding-bottom: 20px;
}

.topic-card {
  min-height: 138px;
  padding: 14px 9px 12px;
  border-radius: 24px;
  background: linear-gradient(180deg, var(--panel-top), var(--panel-bottom));
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  color: var(--silver);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 10px;
  -webkit-tap-highlight-color: transparent;
  transition: all 0.25s ease;
  background: rgba(255, 255, 255, 0.05);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
border: 1px solid rgba(0, 234, 255, 0.18);
}

.topic-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--glow);
}

.topic-card:hover .topic-icon {
  box-shadow: 0 0 35px rgba(0, 200, 255, 0.6);
}

.topic-card:active {
  transform: scale(0.97);
}

.topic-icon {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  position: relative;
  display: block;
  border: 2px solid var(--cyan);
  background: radial-gradient(circle, rgba(0, 127, 255, 0.4), rgba(2, 5, 10, 0.9));
  box-shadow: 0 0 25px rgba(0, 127, 255, 0.35), 0 10px 30px rgba(0, 0, 0, 0.5);
}

.topic-icon svg {
  width: 30px;
  height: 30px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
}

.topic-card span {
  display: block;
  max-width: 100%;
  font-size: clamp(0.77rem, 3.1vw, 1.03rem);
  line-height: 1.08;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.feature-card {
  background: linear-gradient(180deg, #566a83, #172b43);
}

.study-dashboard {
  display: grid;
  gap: 12px;
  margin: 4px 0 18px;
}

.readiness-card,
.weak-panel,
.search-panel {
  border-radius: 24px;
  border: 1px solid rgba(0, 234, 255, 0.16);
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.2), rgba(2, 5, 10, 0.76)),
    rgba(255, 255, 255, 0.04);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.26);
}

.readiness-card {
  min-height: 92px;
  display: grid;
  grid-template-columns: 1fr 76px;
  gap: 12px;
  align-items: center;
  padding: 14px;
}

.readiness-card span,
.readiness-card small {
  display: block;
  color: var(--muted);
  font-weight: 700;
}

.readiness-card span {
  font-size: 0.78rem;
  text-transform: uppercase;
}

.readiness-card strong {
  display: block;
  margin: 3px 0;
  color: var(--text);
  font-size: clamp(1.18rem, 5vw, 1.55rem);
  line-height: 1.05;
}

.readiness-card small {
  font-size: 0.86rem;
  line-height: 1.24;
}

.mini-action {
  min-height: 52px;
  border-radius: 18px;
  background: linear-gradient(180deg, #37efff, #087fc3);
  color: #03111b;
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(0, 234, 255, 0.18);
}

.weak-panel {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.weak-row {
  min-height: 48px;
  display: grid;
  grid-template-columns: 1fr 58px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid rgba(0, 234, 255, 0.13);
  background: rgba(255, 255, 255, 0.045);
  color: var(--text);
  text-align: left;
}

.weak-row span {
  font-weight: 800;
}

.weak-row strong {
  color: var(--cyan);
  text-align: right;
}

.empty-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.28;
}

.bookmark-panel {
  display: grid;
  gap: 10px;
  margin: 2px 0 18px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 2px;
}

.section-heading h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.02rem, 4.2vw, 1.24rem);
  line-height: 1.1;
}

.section-heading span {
  min-width: 34px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid rgba(0, 234, 255, 0.2);
  background: rgba(0, 234, 255, 0.1);
  color: var(--cyan);
  font-size: 0.88rem;
  font-weight: 900;
}

.bookmark-list {
  display: grid;
  gap: 9px;
}

.bookmark-row {
  min-height: 72px;
  padding: 11px 12px;
  display: grid;
  grid-template-columns: 42px 1fr 22px;
  align-items: center;
  gap: 11px;
  border-radius: 20px;
  border: 1px solid rgba(0, 234, 255, 0.16);
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.2), rgba(2, 5, 10, 0.76)),
    rgba(255, 255, 255, 0.04);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.24);
  color: var(--text);
  text-align: left;
}

.bookmark-star {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(0, 234, 255, 0.24);
  background: rgba(0, 234, 255, 0.1);
  color: var(--cyan);
}

.bookmark-star svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
}

.bookmark-row strong,
.bookmark-row small {
  display: block;
}

.bookmark-row strong {
  color: var(--text);
  font-size: clamp(0.96rem, 3.8vw, 1.12rem);
  line-height: 1.12;
}

.bookmark-row small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.list {
  display: grid;
  gap: 12px;
}

.lesson-row {
  width: 100%;
  min-height: 88px;
  padding: 12px 14px;
  border-radius: 18px;
  background: linear-gradient(180deg, var(--panel-top), var(--panel-bottom));
  display: grid;
  grid-template-columns: 56px 1fr 28px;
  align-items: center;
  gap: 12px;
  text-align: left;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.lesson-row .mini-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #dff7ff;
  color: #165e83;
  font-weight: 900;
}

.lesson-row strong {
  font-size: clamp(1rem, 4.6vw, 1.34rem);
  line-height: 1.18;
}

.chevron {
  color: rgba(255, 255, 255, 0.35);
  font-size: 2rem;
}

.progress-strip {
  display: flex;
  justify-content: center;
  gap: 9px;
  margin: 8px 0 16px;
}

.progress-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
}

.progress-dot.active {
  background: var(--red);
}

.reader,
.quiz-card {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.flash-screen {
  display: flex;
  flex-direction: column;
}

.flash-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 2px 6px 18px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.flash-card {
  flex: 1;
  width: 100%;
  min-height: 430px;
  padding: 28px 24px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background:
    linear-gradient(180deg, rgba(73, 91, 116, 0.96), rgba(19, 32, 50, 0.98)),
    radial-gradient(circle at 82% 18%, rgba(68, 215, 255, 0.18), transparent 34%);
  box-shadow: var(--shadow);
  color: var(--text);
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
  touch-action: pan-y;
}

.flash-card.flipped {
  background:
    linear-gradient(180deg, rgba(43, 72, 83, 0.98), rgba(14, 44, 50, 0.98)),
    radial-gradient(circle at 18% 20%, rgba(57, 217, 138, 0.18), transparent 34%);
}

.flash-label {
  align-self: flex-start;
  margin-bottom: 18px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

.flash-card strong {
  display: block;
  color: #fff;
  font-size: clamp(2rem, 9vw, 4.8rem);
  line-height: 1.05;
  font-weight: 900;
  overflow-wrap: anywhere;
}

.flash-card.flipped strong {
  font-size: clamp(1.35rem, 5.8vw, 2.35rem);
  line-height: 1.18;
}

.flash-card.example-card strong,
.flash-card.example-card.flipped strong {
  font-size: clamp(1.2rem, 5vw, 1.9rem);
  line-height: 1.2;
}

.flash-card small {
  display: block;
  margin-top: 24px;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 700;
}

.reader-card {
  flex: 1;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 18px 4px 90px;
  touch-action: pan-y;
}

.reader-card h2 {
  margin: 4px 0 26px;
  color: var(--orange);
  font-size: clamp(1.7rem, 8vw, 2.6rem);
  line-height: 1.02;
}

.reader-card h3 {
  margin: 28px 0 10px;
  color: #ff7f73;
  font-size: 1.22rem;
}

.reader-card p,
.reader-card li {
  color: #f5f6fb;
  font-size: clamp(1.04rem, 4.5vw, 1.32rem);
  line-height: 1.34;
}

.reader-card ul {
  padding-left: 1.4rem;
}

.memory-box {
  margin: 18px 0;
  padding: 14px 15px;
  border-left: 4px solid var(--gold);
  background: rgba(255, 255, 255, 0.07);
  color: #fff3b0;
  font-size: clamp(1rem, 4.1vw, 1.22rem);
  line-height: 1.32;
}

.code-strip {
  margin: 18px 0;
  padding: 12px;
  background: #262626;
  color: #f8f8f2;
  overflow-x: auto;
  white-space: nowrap;
  font-family: "SFMono-Regular", Consolas, monospace;
}

.bottom-nav {
  position: sticky;
  bottom: calc(env(safe-area-inset-bottom) + 8px);
  display: grid;
  grid-template-columns: 56px minmax(104px, 1fr) minmax(126px, 1.18fr) 56px;
  gap: 10px;
  align-items: center;
  margin-top: auto;
  padding-top: 12px;
  background: linear-gradient(180deg, transparent, rgba(2, 5, 10, 0.92) 38%, #02050a 100%);
}

.pill-button {
  min-height: 56px;
  padding: 0 14px;
  border-radius: 999px;
  background: linear-gradient(180deg, #18b8ef, #0698dc);
  color: white;
  font-weight: 800;
  font-size: 0.98rem;
  line-height: 1.05;
  white-space: nowrap;
  box-shadow: 0 10px 24px rgba(0, 157, 225, 0.24);
}

.pill-button.secondary {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--line);
  box-shadow: none;
}

.pill-button.correct {
  background: linear-gradient(180deg, #52e39b, #1fae67);
}

.pill-button.wrong {
  background: linear-gradient(180deg, #ff7474, #d83939);
}

.quiz-progress {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 2px 20px;
  scrollbar-width: none;
}

.quiz-progress span {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 2px solid rgba(255, 255, 255, 0.48);
  color: var(--muted);
  font-weight: 800;
}

.quiz-progress span.active {
  color: var(--orange);
  border-color: var(--orange);
}

.quiz-progress span.correct {
  color: var(--green);
  border-color: var(--green);
}

.quiz-progress span.wrong {
  color: var(--red);
  border-color: var(--red);
}

.question {
  margin: 0 0 24px;
  font-size: clamp(1.18rem, 5.4vw, 1.62rem);
  line-height: 1.28;
  font-weight: 650;
}

.question mark {
  color: var(--orange);
}

.answer-list {
  display: grid;
  gap: 18px;
}

.answer {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 12px;
  align-items: center;
  background: transparent;
  text-align: left;
  min-height: 66px;
}

.answer .ring {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 5px solid var(--gold);
  display: grid;
  place-items: center;
  color: transparent;
}

.answer .ring svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 3;
  fill: none;
}

.answer strong {
  margin-right: 8px;
  color: white;
}

.answer span {
  font-size: clamp(1rem, 4.6vw, 1.32rem);
  line-height: 1.22;
}

.answer.selected .ring {
  color: #071421;
  background: var(--gold);
}

.answer.correct .ring {
  border-color: var(--green);
  background: var(--green);
  color: #071421;
}

.answer.wrong .ring {
  border-color: var(--red);
  background: var(--red);
  color: #071421;
}

.feedback {
  margin: 22px 0;
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.08);
  color: #f8f8f8;
  line-height: 1.35;
}

.score-card {
  margin-top: 26px;
  padding: 22px 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, var(--panel-top), var(--panel-bottom));
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.score-card .score {
  margin: 8px 0;
  color: var(--gold);
  font-size: clamp(3rem, 18vw, 6rem);
  line-height: 0.95;
  font-weight: 900;
}

.score-card p {
  color: var(--muted);
  line-height: 1.38;
}

.topic-screen .list {
  gap: 14px;
}

.topic-screen .lesson-row {
  min-height: 92px;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.28), rgba(9, 18, 35, 0.92)),
    rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(0, 234, 255, 0.18);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.topic-screen .lesson-row .mini-icon {
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 234, 255, 0.26), rgba(2, 5, 10, 0.92));
  border: 1px solid rgba(0, 234, 255, 0.35);
  color: var(--cyan);
  box-shadow: 0 0 22px rgba(0, 127, 255, 0.2);
}

.topic-screen .lesson-row strong {
  color: var(--text);
}

.reader-card {
  margin-top: 4px;
  padding: 22px 18px 104px;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.18), rgba(2, 5, 10, 0.76)),
    rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(0, 234, 255, 0.16);
  box-shadow: var(--shadow);
}

.reader-card h2 {
  color: var(--cyan);
  text-shadow: 0 0 22px rgba(0, 234, 255, 0.24);
}

.lesson-sections {
  display: grid;
  gap: 14px;
  margin: 20px 0;
}

.lesson-section {
  padding: 15px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(0, 234, 255, 0.08), rgba(255, 255, 255, 0.035)),
    rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 234, 255, 0.14);
}

.lesson-section h3 {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: clamp(1.02rem, 4.2vw, 1.18rem);
  line-height: 1.15;
}

.lesson-section ul {
  margin: 0;
  padding-left: 1.15rem;
}

.lesson-section li + li {
  margin-top: 9px;
}

.memory-box {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(0, 234, 255, 0.13), rgba(0, 127, 255, 0.05));
  color: #dffbff;
}

.progress-dot {
  background: rgba(159, 179, 200, 0.55);
}

.progress-dot.active {
  background: var(--cyan);
  box-shadow: var(--glow);
}

.bottom-nav {
  border-top: 1px solid rgba(0, 234, 255, 0.12);
  background: linear-gradient(180deg, transparent, rgba(2, 5, 10, 0.86) 34%, rgba(2, 5, 10, 0.98) 100%);
}

.pill-button {
  background: linear-gradient(180deg, #37efff, #087fc3);
  color: #03111b;
  box-shadow: 0 12px 28px rgba(0, 234, 255, 0.18);
}

.pill-button.secondary {
  background: rgba(255, 255, 255, 0.065);
  border: 1px solid rgba(0, 234, 255, 0.18);
  color: var(--text);
}

.quiz-card {
  gap: 10px;
}

.quiz-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 18px 14px 20px;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.2), rgba(2, 5, 10, 0.78)),
    rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(0, 234, 255, 0.16);
  box-shadow: var(--shadow);
}

.quiz-status {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.quiz-meter {
  height: 7px;
  margin-bottom: 24px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

.quiz-meter span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  box-shadow: var(--glow);
}

.quiz-panel .question {
  margin: 0 0 20px;
  color: var(--text);
  font-size: clamp(1.12rem, 5vw, 1.5rem);
  font-weight: 800;
}

.quiz-panel .answer-list {
  gap: 12px;
}

.quiz-panel .answer {
  min-height: 74px;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding: 13px 14px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(0, 234, 255, 0.12);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.quiz-panel .answer-letter {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(0, 234, 255, 0.12);
  border: 1px solid rgba(0, 234, 255, 0.24);
  color: var(--cyan);
  font-size: 0.98rem;
  font-weight: 900;
}

.quiz-panel .answer-text {
  color: var(--text);
  font-size: clamp(0.98rem, 4.2vw, 1.2rem);
  line-height: 1.2;
}

.quiz-panel .answer.selected {
  border-color: rgba(0, 234, 255, 0.5);
  background: rgba(0, 234, 255, 0.12);
  box-shadow: var(--glow);
}

.quiz-panel .answer.selected .answer-letter {
  background: var(--cyan);
  color: #02101a;
}

.quiz-panel .answer.correct {
  border-color: rgba(0, 255, 166, 0.52);
  background: rgba(0, 255, 166, 0.12);
}

.quiz-panel .answer.correct .answer-letter {
  background: var(--green);
  border-color: var(--green);
  color: #02120c;
}

.quiz-panel .answer.wrong {
  border-color: rgba(255, 77, 109, 0.62);
  background: rgba(255, 77, 109, 0.12);
}

.quiz-panel .answer.wrong .answer-letter {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.quiz-panel .feedback {
  margin: 16px 0 0;
  border: 1px solid rgba(0, 234, 255, 0.14);
  background: rgba(255, 255, 255, 0.065);
  color: #dffbff;
}

.choice-breakdown {
  display: grid;
  gap: 9px;
  margin-top: 12px;
  padding: 13px;
  border-radius: 18px;
  border: 1px solid rgba(0, 234, 255, 0.14);
  background: rgba(0, 0, 0, 0.18);
}

.choice-breakdown > strong {
  color: var(--cyan);
  font-size: 0.95rem;
}

.choice-breakdown p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.28;
}

.choice-breakdown p.right {
  color: #dffbff;
}

.choice-breakdown span {
  color: var(--cyan);
  font-weight: 900;
}

.quiz-actions {
  position: sticky;
  bottom: calc(env(safe-area-inset-bottom) + 8px);
  display: grid;
  grid-template-columns: 0.82fr 1.1fr 0.95fr 0.82fr;
  gap: 8px;
  align-items: center;
  padding-top: 12px;
  background: linear-gradient(180deg, transparent, rgba(2, 5, 10, 0.88) 38%, rgba(2, 5, 10, 0.98));
}

.quiz-actions button {
  min-height: 54px;
  border-radius: 18px;
  font-weight: 900;
}

.quiz-nav-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(0, 234, 255, 0.14);
  color: var(--text);
}

.quiz-nav-button svg {
  width: 21px;
  height: 21px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
}

.quiz-primary {
  background: linear-gradient(180deg, #37efff, #087fc3);
  color: #03111b;
  box-shadow: 0 12px 28px rgba(0, 234, 255, 0.18);
}

.quiz-primary.correct {
  background: linear-gradient(180deg, #43ffc0, #13a66e);
}

.quiz-primary.wrong {
  background: linear-gradient(180deg, #ff748a, #d22c4c);
  color: #fff;
}

.quiz-ghost {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(0, 234, 255, 0.18);
  color: var(--text);
}

.score-card {
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.22), rgba(2, 5, 10, 0.82)),
    rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 234, 255, 0.18);
  box-shadow: var(--shadow);
}

.score-card .score {
  color: var(--cyan);
  text-shadow: var(--glow);
}

.score-card .pill-button {
  width: 100%;
  margin-top: 10px;
}

.flash-meta {
  margin: 2px 6px 14px;
  color: var(--muted);
}

.flash-tools {
  display: grid;
  grid-template-columns: 0.76fr 0.72fr 1.25fr;
  gap: 10px;
  margin: 0 0 14px;
}

.flash-tool {
  min-height: 44px;
  padding: 8px 11px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.065);
  border: 1px solid rgba(0, 234, 255, 0.18);
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 900;
  line-height: 1.05;
  text-align: center;
  overflow-wrap: anywhere;
}

.flash-tool:first-child {
  background: linear-gradient(180deg, rgba(55, 239, 255, 0.18), rgba(8, 127, 195, 0.12));
  color: var(--cyan);
}

.flash-tool.saved {
  border-color: rgba(0, 255, 166, 0.32);
  background: rgba(0, 255, 166, 0.11);
  color: var(--green);
}

.flash-card {
  background:
    linear-gradient(180deg, rgba(34, 71, 120, 0.22), rgba(2, 5, 10, 0.82)),
    rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 234, 255, 0.18);
  box-shadow: var(--shadow);
}

.flash-card.flipped {
  background:
    linear-gradient(180deg, rgba(0, 127, 255, 0.18), rgba(2, 5, 10, 0.84)),
    rgba(255, 255, 255, 0.04);
}

.flash-label {
  border-color: rgba(0, 234, 255, 0.22);
  background: rgba(0, 234, 255, 0.12);
  color: var(--cyan);
}

.flash-subject-row {
  grid-template-columns: 56px 1fr 54px;
}

.flash-subject-row .mini-icon svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
}

.subject-count {
  width: 42px;
  height: 34px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(0, 234, 255, 0.1);
  border: 1px solid rgba(0, 234, 255, 0.2);
  color: var(--cyan);
  font-weight: 900;
}

.search-panel {
  display: grid;
  gap: 14px;
  padding: 14px;
}

.search-input {
  width: 100%;
  min-height: 54px;
  padding: 0 15px;
  border-radius: 18px;
  border: 1px solid rgba(0, 234, 255, 0.22);
  background: rgba(2, 5, 10, 0.62);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  outline: none;
}

.search-input:focus {
  box-shadow: var(--glow);
}

.search-results {
  display: grid;
  gap: 10px;
}

.search-row {
  min-height: 74px;
  display: grid;
  gap: 3px;
  padding: 12px 13px;
  border-radius: 18px;
  border: 1px solid rgba(0, 234, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  text-align: left;
}

.search-row span {
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
}

.search-row strong {
  font-size: clamp(1rem, 4vw, 1.18rem);
  line-height: 1.12;
}

.search-row small {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

@media (max-width: 370px) {
  .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bottom-nav {
    grid-template-columns: 52px 1fr 52px;
  }

  .bottom-nav .pill-button.secondary {
    display: none;
  }
}

@media (min-width: 700px) {
  .topic-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}