:root {
  --bg-0: #111217;
  --bg-1: #171a24;
  --bg-2: #212534;
  --ink: #f5f1e8;
  --muted: #a5adbc;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --gold: #ffd166;
  --coral: #ff6b35;
  --teal: #21c6b8;
  --sky: #4dc8ff;
  --rose: #ff4365;
  --lime: #b8f06f;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --display: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  --body: "Avenir Next Condensed", "Trebuchet MS", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--body);
  color: var(--ink);
  background-color: #141720;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 36px 36px;
  letter-spacing: 0;
}

body::before {
  display: none; /* This completely disables the laggy GPU mask */
}
button,
input,
select {
  font: inherit;
}

label {
  display: grid;
  gap: 6px;
}

select,
input[type="range"] {
  width: 100%;
}

select {
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  padding: 10px 12px;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  padding: 16px;
}

.chrome {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  gap: 16px;
  min-height: calc(100vh - 32px);
}

/* 1. Only blur the outer containers */
.rail,
.stage,
.overlay-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.03));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px); /* Adds Safari/Mac support */
  box-shadow: var(--shadow);
}

/* 2. Remove the heavy blur from the inner panels */
.panel {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.08); /* Flat transparency, NO GPU blur */
  box-shadow: var(--shadow);
}
}

.rail {
  border-radius: var(--radius-lg);
  padding: 18px;
}

.left-rail,
.right-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stage {
  border-radius: 24px;
  padding: 18px;
  overflow: hidden;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--coral), var(--gold));
  color: #111217;
  font-family: var(--display);
  font-size: 1.45rem;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.18);
}

.brand-title {
  display: grid;
  gap: 3px;
}

.eyebrow {
  color: var(--gold);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.title {
  font-family: var(--display);
  font-size: clamp(2.4rem, 4vw, 4.1rem);
  line-height: 0.9;
  margin: 0;
  text-transform: uppercase;
}

.subtitle,
.muted {
  color: var(--muted);
}

.small {
  font-size: 0.9rem;
}

.top-stack {
  display: grid;
  gap: 14px;
}

.logo-row,
.top-metrics,
.settings-stack,
.mode-stack,
.stat-stack,
.teacher-controls,
.summary-grid,
.arena-grid,
.option-grid,
.quick-actions,
.session-actions,
.source-grid,
.logic-bank,
.progress-stack,
.meta-row {
  display: grid;
  gap: 12px;
}

.logo-row {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.nav-button,
.btn,
.toggle,
.choice-card,
.arena-tile,
.source-card,
.step-card,
.choice-pill,
.bin-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink);
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.nav-button,
.btn,
.toggle,
.bin-button {
  min-height: 46px;
  border-radius: 12px;
  padding: 12px 14px;
}

.nav-button,
.btn {
  font-weight: 700;
}

.nav-button:hover,
.btn:hover,
.toggle:hover,
.choice-card:hover,
.arena-tile:hover,
.source-card:hover,
.step-card:hover,
.bin-button:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 209, 102, 0.5);
}

.nav-button.active,
.btn.primary,
.choice-card.selected,
.source-card.selected,
.step-card.selected,
.bin-button.active {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.26), rgba(255, 209, 102, 0.22));
  border-color: rgba(255, 209, 102, 0.72);
  box-shadow: 0 0 0 1px rgba(255, 209, 102, 0.22), 0 10px 24px rgba(0, 0, 0, 0.16);
}

.btn.primary {
  color: #111217;
  background: linear-gradient(135deg, var(--gold), #fff2bf);
}

.btn.secondary {
  background: linear-gradient(135deg, rgba(33, 198, 184, 0.18), rgba(77, 200, 255, 0.16));
}

.btn.ghost {
  background: rgba(255, 255, 255, 0.01);
}

.btn:disabled,
.choice-card.disabled,
.source-card.disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.metric-card,
.panel,
.coach-box,
.teacher-box,
.summary-card,
.feedback-banner,
.arena-callout,
.boss-banner,
.empty-state {
  border-radius: var(--radius-md);
  padding: 14px;
}

.metric-card,
.panel,
.coach-box,
.teacher-box,
.summary-card,
.feedback-banner,
.arena-callout,
.boss-banner,
.empty-state {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
}

.metric-card strong,
.panel strong,
.summary-card strong {
  display: block;
}

.pill-row,
.tag-row,
.medal-row,
.title-row,
.arena-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill,
.choice-pill,
.stat-pill,
.arena-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  border-radius: 999px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
  font-weight: 700;
}

.choice-pill {
  justify-content: space-between;
  width: 100%;
  text-align: left;
}

.stat-pill strong {
  color: var(--gold);
}

.big {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--gold);
}

.progress-bar,
.timer-bar,
.health-bar {
  position: relative;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.08);
}

.progress-fill,
.timer-fill,
.health-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--gold));
}

.timer-fill {
  background: linear-gradient(90deg, var(--teal), var(--sky), var(--gold));
}

.timer-fill.pressure {
  background: linear-gradient(90deg, var(--gold), var(--coral), var(--rose));
}

.health-fill {
  background: linear-gradient(90deg, var(--coral), var(--gold));
}

.main-header {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(290px, 0.9fr);
  gap: 16px;
  align-items: start;
}

.hero-banner {
  min-height: 280px;
  border-radius: 20px;
  padding: 20px;
  background:
    radial-gradient(circle at top right, rgba(255, 209, 102, 0.2), transparent 34%),
    linear-gradient(135deg, rgba(255, 107, 53, 0.16), rgba(33, 198, 184, 0.15)),
    rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 209, 102, 0.24);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-banner p {
  max-width: 32rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.hero-stat {
  border-radius: 12px;
  padding: 12px;
  background: rgba(0, 0, 0, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-stat .value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--gold);
}

.arena-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.arena-tile {
  border-radius: 16px;
  padding: 16px;
  display: grid;
  gap: 12px;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.arena-tile::after {
  content: "";
  position: absolute;
  inset: auto -35px -35px auto;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.16), transparent 70%);
}

.arena-tile.locked {
  opacity: 0.56;
}

.arena-tile.current {
  border-color: rgba(255, 209, 102, 0.72);
}

.arena-tile h3,
.mode-card h3,
.round-title,
.summary-title,
.boss-title {
  margin: 0;
  font-family: var(--display);
  text-transform: uppercase;
  line-height: 0.95;
}

.mode-card {
  border-radius: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  display: grid;
  gap: 12px;
}

.round-shell {
  display: grid;
  gap: 16px;
}

.round-topline {
  display: grid;
  grid-template-columns: 1.1fr minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.round-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  font-weight: 800;
}

.round-title {
  font-size: clamp(2rem, 3vw, 3rem);
}

.round-description {
  color: #d5d9e1;
  max-width: 44rem;
}

.score-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.score-box {
  min-width: 120px;
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.12);
}

.score-box strong {
  font-size: 1.4rem;
  color: var(--gold);
}

.battlefield {
  display: grid;
  gap: 16px;
}

.prompt-panel {
  display: grid;
  gap: 12px;
  min-height: 360px;
}

.prompt-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.prompt-label {
  font-weight: 900;
  text-transform: uppercase;
  color: var(--gold);
  letter-spacing: 0.05em;
}

.prompt-text,
.passage-block,
.argument-block,
.revision-block {
  border-radius: 16px;
  padding: 16px;
  background: rgba(0, 0, 0, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 1.12rem;
  line-height: 1.45;
}

.prompt-question {
  font-size: 1.35rem;
  font-weight: 800;
}

.option-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.choice-card,
.source-card,
.step-card {
  border-radius: 16px;
  padding: 16px;
  text-align: left;
  min-height: 120px;
  display: grid;
  gap: 8px;
}

.choice-card strong,
.source-card strong,
.step-card strong {
  font-size: 0.84rem;
  text-transform: uppercase;
  color: var(--gold);
}

.choice-card .hotkey,
.source-card .hotkey,
.step-card .hotkey,
.bin-button .hotkey {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--line);
  font-size: 0.86rem;
  font-weight: 900;
}

.sort-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
}

.bins {
  display: grid;
  gap: 10px;
}

.bin-button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
}

.logic-assembly {
  display: grid;
  gap: 14px;
}

.logic-slots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.logic-slot {
  min-height: 100px;
  border-radius: 14px;
  padding: 12px;
  border: 1px dashed rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.03);
}

.logic-slot strong {
  display: block;
  margin-bottom: 8px;
  color: var(--gold);
  text-transform: uppercase;
  font-size: 0.8rem;
}

.logic-bank {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.source-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.source-card.selected {
  background: linear-gradient(135deg, rgba(33, 198, 184, 0.26), rgba(77, 200, 255, 0.18));
}

.feedback-banner {
  display: grid;
  gap: 6px;
}

.feedback-banner.strong {
  border-color: rgba(184, 240, 111, 0.45);
  background: rgba(184, 240, 111, 0.12);
}

.feedback-banner.weak {
  border-color: rgba(255, 209, 102, 0.42);
  background: rgba(255, 209, 102, 0.12);
}

.feedback-banner.flawed {
  border-color: rgba(255, 67, 101, 0.42);
  background: rgba(255, 67, 101, 0.11);
}

.coach-box {
  display: grid;
  gap: 10px;
}

.coach-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.coach-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(33, 198, 184, 0.22), rgba(255, 209, 102, 0.18));
  display: grid;
  place-items: center;
  font-weight: 900;
}

.boss-banner {
  border-color: rgba(255, 107, 53, 0.45);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.18), rgba(255, 67, 101, 0.12));
}

.summary-screen {
  display: grid;
  gap: 18px;
}

.summary-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.summary-card .big {
  font-size: 2rem;
  font-weight: 900;
  color: var(--gold);
}

.medal {
  min-width: 96px;
  min-height: 96px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: var(--display);
  font-size: 1.3rem;
  letter-spacing: 0.03em;
  border: 3px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.04);
}

.medal.bronze {
  color: #f0b38b;
  border-color: rgba(240, 179, 139, 0.58);
}

.medal.silver {
  color: #e7edf8;
  border-color: rgba(231, 237, 248, 0.58);
}

.medal.gold {
  color: #ffe59a;
  border-color: rgba(255, 229, 154, 0.74);
}

.medal.perfect {
  color: #b8f06f;
  border-color: rgba(184, 240, 111, 0.82);
}

.toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  min-width: 260px;
  max-width: 320px;
  border-radius: 14px;
  padding: 14px;
  border: 1px solid var(--line-strong);
  background: rgba(17, 18, 23, 0.92);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.28);
  z-index: 50;
}

.flash-strong,
.flash-weak,
.flash-flawed {
  animation: flash 420ms ease;
}

@keyframes flash {
  0% {
    transform: scale(0.99);
    filter: brightness(1.04);
  }
  50% {
    transform: scale(1.01);
    filter: brightness(1.14);
  }
  100% {
    transform: scale(1);
    filter: brightness(1);
  }
}

.pulse {
  animation: pulse 380ms ease;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  45% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.hidden {
  display: none !important;
}

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

.noscript {
  min-height: calc(100vh - 32px);
  display: grid;
  place-items: center;
  text-align: center;
  font-size: 1.2rem;
}

body.presentation-mode .left-rail,
body.presentation-mode .right-rail {
  display: none;
}

body.presentation-mode .chrome {
  grid-template-columns: minmax(0, 1fr);
}

body.reduced-motion *,
body.reduced-motion *::before,
body.reduced-motion *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

@media (max-width: 1200px) {
  .chrome {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .right-rail {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
  }
}

@media (max-width: 900px) {
  .chrome {
    grid-template-columns: 1fr;
  }

  .left-rail,
  .right-rail {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .round-topline,
  .sort-board {
    grid-template-columns: 1fr;
  }

  .arena-grid,
  .summary-grid,
  .logic-slots,
  .option-grid,
  .source-grid,
  .logic-bank,
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 10px;
  }

  .left-rail,
  .right-rail {
    grid-template-columns: 1fr;
  }

  .stage {
    padding: 14px;
    border-radius: 18px;
  }

  .title {
    font-size: 2.55rem;
  }

  .round-title {
    font-size: 2rem;
  }
}