:root {
  --navy-950: #07111f;
  --navy-900: #0b1729;
  --navy-800: #10243b;
  --navy-700: #183654;
  --felt-700: #0f5d45;
  --felt-500: #19a06f;
  --cream: #fff2d2;
  --cream-soft: #f4dfb0;
  --amber: #f5a623;
  --amber-dark: #9a5f00;
  --red: #e86d5c;
  --green: #49d18c;
  --text: #f9f1dc;
  --muted: #b8c2cc;
  --line: rgba(255, 242, 210, 0.16);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(25, 160, 111, 0.18), transparent 35%),
    radial-gradient(circle at bottom right, rgba(245, 166, 35, 0.12), transparent 30%),
    var(--navy-950);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

button,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  padding: 28px clamp(18px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  background: rgba(7, 17, 31, 0.82);
  backdrop-filter: blur(18px);
  top: 0;
  z-index: 10;
}

.kicker,
.eyebrow {
  margin: 0 0 8px;
  color: var(--felt-500);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.7rem);
  line-height: 0.95;
}

h2 {
  margin: 0;
}

.top-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.segmented {
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  display: inline-flex;
}

.segmented button,
.chip {
  border: 0;
  color: var(--cream);
  background: transparent;
  border-radius: 999px;
  padding: 9px 14px;
  font-weight: 700;
}

.segmented button.active,
.chip.active {
  background: var(--felt-500);
  color: var(--navy-950);
}

.select-label {
  color: var(--muted);
  font-size: 0.84rem;
  display: grid;
  gap: 4px;
}

select {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cream);
  background: var(--navy-800);
  padding: 9px 14px;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(330px, 0.75fr);
  gap: 24px;
  padding: clamp(18px, 4vw, 52px);
  max-width: 1500px;
  margin: 0 auto;
}

.filter-select {
  width: 100%;
  max-width: 360px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cream);
  background: var(--navy-800);
  padding: 12px 16px;
  font-weight: 700;
}

.review-scope {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(25, 160, 111, 0.08);
  padding: 14px;
  margin-bottom: 14px;
}

.review-scope strong {
  color: var(--amber);
}

.review-scope p {
  margin: 6px 0 0;
  color: var(--muted);
}

.review-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 12px 0;
}

.review-summary-grid div {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.review-summary-grid strong {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  color: var(--cream);
}

.review-summary-grid span {
  color: var(--muted);
  font-size: 0.78rem;
}
.practice-panel,
.sidebar,
.filter-card,
.score-strip,
.quiz-banner {
  border: 1px solid var(--line);
  background: rgba(11, 23, 41, 0.84);
  box-shadow: var(--shadow);
}

.practice-panel,
.sidebar {
  border-radius: var(--radius-xl);
  padding: clamp(16px, 3vw, 28px);
}

.filter-card {
  border-radius: var(--radius-lg);
  padding: 18px;
  display: grid;
  gap: 18px;
}

.filter-card p {
  margin: 6px 0 0;
  color: var(--muted);
}

.filter-group {
  display: grid;
  gap: 10px;
}

.filter-group > span {
  color: var(--cream-soft);
  font-weight: 700;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.quiz-banner {
  margin-top: 16px;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--cream);
}

.quiz-banner strong {
  color: var(--amber);
}

.score-strip {
  margin-top: 18px;
  border-radius: var(--radius-lg);
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.score-strip div {
  border-radius: var(--radius-md);
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.score-strip strong {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  color: var(--cream);
}

.score-strip span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.78rem;
}

.timer-wrap {
  margin: 16px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
}

.timer-track {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.timer-track span {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--felt-500), var(--amber));
  transition: width 0.1s linear;
}

.timer-wrap p {
  min-width: 82px;
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  text-align: right;
}

.deck-notice {
  min-height: 22px;
  margin: 8px 0;
  color: var(--amber);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.deck-notice.show {
  opacity: 1;
}

.flashcard {
  height: clamp(430px, 56vh, 560px);
  min-height: 430px;
  perspective: 1600px;
  outline: none;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.2, 0.75, 0.2, 1);
}

.flashcard.is-flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid rgba(255, 242, 210, 0.22);
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
  overflow-x: hidden;
}

.card-front {
  background:
    linear-gradient(135deg, rgba(15, 93, 69, 0.28), transparent 44%),
    linear-gradient(160deg, #112944, #07111f);
}

.card-back {
  background:
    radial-gradient(circle at 15% 20%, rgba(245, 166, 35, 0.24), transparent 34%),
    linear-gradient(160deg, #133b31, #07111f);
  transform: rotateY(180deg);
}

.card-face::before {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px dashed rgba(255, 242, 210, 0.17);
  border-radius: calc(var(--radius-xl) - 12px);
  pointer-events: none;
}

.card-face > * {
  position: relative;
  z-index: 1;
}

.card-back h2 {
  font-size: clamp(1.4rem, 2.65vw, 2.55rem);
  line-height: 1.16;
}

.card-topline {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.card-topline.compact {
  margin-bottom: 14px;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  padding: 7px 12px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--cream);
}

.badge-green {
  background: rgba(25, 160, 111, 0.24);
  border-color: rgba(25, 160, 111, 0.42);
}

.card-face h2 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(1.55rem, 3.2vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.card-hint,
.answer-meta,
.empty-card p,
.muted {
  color: var(--muted);
}

.card-hint {
  margin: clamp(16px, 2vw, 24px) 0 0;
  color: var(--muted);
}

.answer-layout {
  display: grid;
  grid-template-columns: minmax(100px, 0.24fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(18px, 4vw, 38px);
  width: 100%;
}

.buzzer-chip {
  width: clamp(104px, 14vw, 156px);
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  align-content: center;
  background:
    radial-gradient(circle, #ffd57b 0 34%, var(--amber) 35% 58%, var(--amber-dark) 59% 61%, var(--amber) 62%);
  color: #201300;
  box-shadow:
    inset 0 0 0 8px rgba(255, 255, 255, 0.2),
    0 24px 50px rgba(0, 0, 0, 0.32);
  font-family: "IBM Plex Mono", monospace;
  flex-shrink: 0;
}

.buzzer-chip span {
  font-size: clamp(2.1rem, 4.8vw, 4.25rem);
  line-height: 0.9;
  font-weight: 700;
}

.buzzer-chip small {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
}

.card-controls,
.utility-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.primary-btn,
.success-btn,
.danger-btn,
.ghost-btn,
.mini-btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 800;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.primary-btn:hover,
.success-btn:hover,
.danger-btn:hover,
.ghost-btn:hover,
.mini-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.primary-btn {
  background: var(--amber);
  color: #211400;
}

.primary-btn.alt {
  background: var(--cream);
}

.success-btn {
  background: var(--green);
  color: #04150e;
}

.danger-btn {
  background: var(--red);
  color: #240704;
}

.ghost-btn,
.mini-btn {
  border: 1px solid var(--line);
  color: var(--cream);
  background: rgba(255, 255, 255, 0.06);
}

.mini-btn {
  padding: 8px 12px;
  font-size: 0.85rem;
}

.mini-btn.danger {
  border-color: rgba(232, 109, 92, 0.55);
  color: #ffd0ca;
}

.keyboard-help {
  color: var(--muted);
  font-size: 0.88rem;
}

kbd {
  font-family: "IBM Plex Mono", monospace;
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  border-radius: 7px;
  padding: 1px 6px;
  color: var(--cream);
  background: rgba(255, 255, 255, 0.05);
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 120px;
  max-height: calc(100vh - 150px);
  overflow: auto;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 22px;
}

.tabs button {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cream);
  background: rgba(255, 255, 255, 0.05);
  padding: 10px;
  font-weight: 800;
}

.tabs button.active {
  background: var(--felt-500);
  color: var(--navy-950);
}

.tab-panel h2 {
  margin-bottom: 14px;
}

.side-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.045);
  padding: 14px;
  margin-bottom: 12px;
}

.side-card p {
  margin: 10px 0;
  line-height: 1.45;
}

.side-card-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 0.8rem;
}

.result {
  border-radius: 999px;
  padding: 3px 8px;
  font-weight: 800;
}

.result.correct {
  background: rgba(73, 209, 140, 0.16);
  color: var(--green);
}

.result.missed {
  background: rgba(232, 109, 92, 0.16);
  color: #ff9a8f;
}

.result.skipped {
  background: rgba(245, 166, 35, 0.16);
  color: var(--amber);
}

details {
  color: var(--cream-soft);
}

summary {
  cursor: pointer;
  color: var(--felt-500);
  font-weight: 800;
}

.missed-actions {
  margin-bottom: 12px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.stat-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px;
  background: rgba(255, 255, 255, 0.045);
}

.stat-box strong {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.5rem;
  color: var(--amber);
}

.stat-box span {
  color: var(--muted);
}

.stats-list {
  display: grid;
  gap: 12px;
  margin-bottom: 24px;
}

.stat-row-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--cream-soft);
}

.bar {
  height: 8px;
  border-radius: 999px;
  margin-top: 6px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--felt-500), var(--amber));
}

.empty-card {
  position: relative;
  z-index: 1;
}

@media (max-width: 1050px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-controls {
    justify-content: flex-start;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 650px) {
  .score-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .flashcard {
    height: min(68vh, 580px);
    min-height: 430px;
  }

  .card-face {
    padding: 24px;
  }

  .card-face h2 {
    font-size: clamp(1.35rem, 7vw, 2rem);
  }

  .card-back h2 {
    font-size: clamp(1.25rem, 6vw, 1.8rem);
  }

  .answer-layout {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .buzzer-chip {
    width: 112px;
  }

  .card-controls > button,
  .utility-controls > button {
    flex: 1 1 100%;
  }
  .review-summary-grid {
  grid-template-columns: 1fr;
}
}