:root {
  --color-bg: #07111f;
  --color-bg-deep: #030914;
  --color-surface: #0d1b2a;
  --color-surface-elevated: #13253a;
  --color-surface-glass: rgba(23, 43, 66, .72);
  --color-border: #263b52;
  --color-border-strong: #3a526d;
  --color-text: #f5f8fc;
  --color-text-muted: #a9bacd;
  --color-text-subtle: #8298b0;
  --color-accent: #ff6a3d;
  --color-accent-hover: #ff835e;
  --color-on-accent: #111721;
  --color-info: #59d9ff;
  --color-success: #48e59b;
  --color-warning: #ffd166;
  --color-danger: #ff6b7a;
  --color-focus: #8de8ff;
  --color-overlay: rgba(2, 7, 17, .82);
  --font-display: Manrope, Inter, system-ui, sans-serif;
  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, monospace;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --radius-sm: .5rem;
  --radius-md: .875rem;
  --radius-lg: 1.375rem;
  --radius-xl: 2rem;
  --radius-pill: 999px;
  --shadow-card: 0 1.125rem 3.75rem rgba(1, 8, 18, .35);
  --shadow-pop: 0 1.75rem 5.625rem rgba(0, 0, 0, .5);
  --shadow-accent: 0 0 0 1px rgba(255, 106, 61, .2), 0 1rem 3rem rgba(255, 106, 61, .16);
  --motion-fast: 140ms;
  --motion-base: 260ms;
  --motion-scene: 520ms;
  --motion-slow: 900ms;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { background: var(--color-bg-deep); scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% -10%, rgba(30, 73, 108, .3), transparent 44rem),
    linear-gradient(155deg, var(--color-bg) 0%, var(--color-bg-deep) 78%);
  color: var(--color-text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }
button { color: inherit; }
a { color: inherit; }

:focus-visible {
  outline: .1875rem solid var(--color-focus);
  outline-offset: .1875rem;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-200%);
}
.skip-link:focus { transform: translateY(0); }

.ambient { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.ambient__grid {
  position: absolute;
  inset: -20%;
  opacity: .17;
  background-image:
    linear-gradient(rgba(89, 217, 255, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(89, 217, 255, .12) 1px, transparent 1px);
  background-size: 5rem 5rem;
  mask-image: radial-gradient(circle at 50% 28%, black, transparent 68%);
  transform: perspective(50rem) rotateX(58deg) translateY(9rem) scale(1.25);
  animation: grid-drift 24s ease-in-out infinite alternate;
}
.ambient__orb { position: absolute; width: 32rem; height: 32rem; border-radius: 50%; filter: blur(7rem); opacity: .1; }
.ambient__orb--orange { top: 4%; right: -15rem; background: var(--color-accent); animation: orb-a 22s ease-in-out infinite alternate; }
.ambient__orb--cyan { bottom: -14rem; left: -12rem; background: var(--color-info); animation: orb-b 27s ease-in-out infinite alternate; }
.signal-axis { position: absolute; top: 5rem; left: 0; width: 35%; height: 1px; background: linear-gradient(90deg, transparent, var(--color-info), transparent); opacity: .4; animation: signal-scan 9s ease-in-out infinite; }

@keyframes grid-drift { to { transform: perspective(50rem) rotateX(58deg) translate(1.4rem, 8rem) scale(1.28); } }
@keyframes orb-a { to { transform: translate(-5rem, 8rem); } }
@keyframes orb-b { to { transform: translate(7rem, -4rem); } }
@keyframes signal-scan { 0%, 100% { transform: translateX(-100%); opacity: 0; } 45%, 55% { opacity: .5; } 60% { transform: translateX(390%); opacity: 0; } }

.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 4.5rem;
  padding: 0 clamp(1rem, 4vw, 3.5rem);
  border-bottom: 1px solid rgba(58, 82, 109, .5);
  background: rgba(3, 9, 20, .76);
  backdrop-filter: blur(1.2rem);
}
.brand { display: inline-flex; align-items: center; gap: var(--space-3); width: fit-content; padding: 0; border: 0; background: transparent; text-align: left; cursor: pointer; }
.brand__mark { display: grid; grid-template-columns: repeat(3, .3rem); align-items: end; gap: .2rem; width: 1.3rem; height: 1.8rem; transform: skewX(-12deg); }
.brand__mark i { display: block; background: var(--color-accent); border-radius: .15rem; }
.brand__mark i:nth-child(1) { height: 48%; }
.brand__mark i:nth-child(2) { height: 100%; background: var(--color-text); }
.brand__mark i:nth-child(3) { height: 72%; background: var(--color-info); }
.brand strong, .brand small { display: block; font-family: var(--font-display); }
.brand strong { font-size: .98rem; letter-spacing: .16em; }
.brand small { margin-top: .12rem; color: var(--color-text-subtle); font-size: .55rem; letter-spacing: .24em; }
.header-status { display: flex; align-items: center; justify-content: center; gap: var(--space-3); min-width: 12rem; }
.header-mode { color: var(--color-text-muted); font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.mini-progress { width: clamp(5rem, 10vw, 9rem); height: .25rem; overflow: hidden; border-radius: var(--radius-pill); background: var(--color-border); }
.mini-progress i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--color-info), var(--color-accent)); transition: width var(--motion-base) var(--ease-out); }
.header-actions { display: flex; justify-content: flex-end; gap: var(--space-2); }
.icon-button { display: inline-flex; align-items: center; gap: var(--space-2); min-height: 2.5rem; padding: 0 var(--space-3); border: 1px solid transparent; border-radius: var(--radius-pill); background: transparent; color: var(--color-text-muted); cursor: pointer; transition: background var(--motion-fast), color var(--motion-fast), border var(--motion-fast); }
.icon-button:hover { border-color: var(--color-border); background: var(--color-surface); color: var(--color-text); }
.icon-button[aria-pressed="true"] { border-color: var(--color-info); color: var(--color-info); }
.icon-button__label { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }

#app-main { width: min(100%, 90rem); min-height: calc(100vh - 4.5rem); margin: 0 auto; padding: clamp(2rem, 6vw, 5.5rem) clamp(1rem, 5vw, 4.5rem) 7rem; }
.scene { animation: scene-in var(--motion-scene) var(--ease-out) both; }
@keyframes scene-in { from { opacity: 0; transform: translateY(1.5rem); } }

.eyebrow { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); color: var(--color-info); font-size: .72rem; font-weight: 850; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 1.8rem; height: 1px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--font-display); }
h1 { max-width: 60rem; margin-bottom: var(--space-5); font-size: clamp(2.5rem, 7vw, 6.5rem); line-height: .94; letter-spacing: -.055em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.6rem); line-height: 1.05; letter-spacing: -.03em; }
h3 { margin-bottom: var(--space-2); font-size: 1.2rem; }
.lead { max-width: 46rem; color: var(--color-text-muted); font-size: clamp(1rem, 1.8vw, 1.25rem); line-height: 1.65; }
.accent-text { color: var(--color-accent); }
.muted { color: var(--color-text-muted); }
.subtle { color: var(--color-text-subtle); }
.mono { font-family: var(--font-mono); }

.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(18rem, .75fr); gap: clamp(2rem, 7vw, 7rem); align-items: end; padding-top: clamp(1rem, 5vh, 4rem); }
.hero__copy { position: relative; }
.hero__copy::after { content: ""; position: absolute; top: -2rem; left: -2rem; width: 8rem; height: .12rem; background: linear-gradient(90deg, var(--color-accent), transparent); }
.hero__meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin-top: var(--space-8); }
.metric { padding: var(--space-4); border-top: 1px solid var(--color-border); }
.metric strong { display: block; margin-bottom: var(--space-1); font-family: var(--font-mono); font-size: 1.35rem; }
.metric span { color: var(--color-text-subtle); font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; }
.last-result { display: inline-flex; align-items: baseline; gap: var(--space-3); margin: var(--space-5) 0 0; padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-pill); background: rgba(13,27,42,.6); }
.last-result span, .last-result small { color: var(--color-text-subtle); font-size: .65rem; letter-spacing: .1em; }
.last-result strong { color: var(--color-success); font-family: var(--font-mono); }
.mode-grid { display: grid; gap: var(--space-4); }
.mode-card { position: relative; overflow: hidden; display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-5); align-items: center; width: 100%; min-height: 9.5rem; padding: var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: linear-gradient(135deg, rgba(19,37,58,.92), rgba(9,20,34,.88)); box-shadow: var(--shadow-card); text-align: left; cursor: pointer; transition: transform var(--motion-base) var(--ease-out), border var(--motion-fast), box-shadow var(--motion-base); }
.mode-card::before { content: ""; position: absolute; inset: auto -20% -80% 20%; height: 120%; background: radial-gradient(circle, rgba(89,217,255,.18), transparent 62%); transition: transform var(--motion-scene) var(--ease-out); }
.mode-card--exam::before { background: radial-gradient(circle, rgba(255,106,61,.2), transparent 62%); }
.mode-card--mistakes::before { background: radial-gradient(circle, rgba(255,209,102,.18), transparent 62%); }
.mode-card--catalog::before { background: radial-gradient(circle, rgba(141,232,255,.16), transparent 62%); }
.mode-card:hover { transform: translateY(-.35rem); border-color: var(--color-border-strong); box-shadow: var(--shadow-accent); }
.mode-card:hover::before { transform: translateY(-18%); }
.mode-card__number { align-self: start; color: var(--color-text-subtle); font-family: var(--font-mono); font-size: .72rem; }
.mode-card__copy { position: relative; z-index: 1; }
.mode-card__copy strong { display: block; margin-bottom: var(--space-2); font-family: var(--font-display); font-size: 1.55rem; }
.mode-card__copy span { color: var(--color-text-muted); line-height: 1.5; }
.arrow { position: relative; z-index: 1; display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border-radius: 50%; background: var(--color-info); color: var(--color-on-accent); font-size: 1.4rem; transition: transform var(--motion-base) var(--ease-out); }
.mode-card--exam .arrow { background: var(--color-accent); }
.mode-card--mistakes .arrow { background: var(--color-warning); }
.mode-card--catalog .arrow { background: var(--color-text); }
.mode-card:hover .arrow { transform: translateX(.25rem); }
.mode-card:disabled { opacity: .5; cursor: default; box-shadow: none; }
.mode-card:disabled:hover { transform: none; border-color: var(--color-border); }
.mode-card:disabled .arrow { background: var(--color-border-strong); color: var(--color-text-muted); }
.disclaimer { margin-top: var(--space-6); padding: var(--space-4); border-left: .2rem solid var(--color-warning); background: rgba(255,209,102,.06); color: var(--color-text-muted); font-size: .8rem; line-height: 1.55; }

.section-head { display: flex; justify-content: space-between; gap: var(--space-8); align-items: end; margin-bottom: var(--space-10); }
.section-head h1 { margin-bottom: 0; font-size: clamp(2.5rem, 6vw, 5rem); }
.section-head__aside { max-width: 26rem; color: var(--color-text-muted); line-height: 1.6; }
.recommendation { display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-4); align-items: center; width: 100%; margin-bottom: var(--space-6); padding: var(--space-5) var(--space-6); border: 1px solid rgba(255,209,102,.35); border-radius: var(--radius-lg); background: linear-gradient(110deg, rgba(255,209,102,.1), rgba(13,27,42,.68)); color: var(--color-text); text-align: left; cursor: pointer; transition: transform var(--motion-base) var(--ease-out), border var(--motion-fast); }
.recommendation:hover { transform: translateY(-.2rem); border-color: var(--color-warning); }
.recommendation__pulse { width: .75rem; height: .75rem; border-radius: 50%; background: var(--color-warning); box-shadow: 0 0 0 .45rem rgba(255,209,102,.08); animation: recommendation-pulse 2.8s ease-in-out infinite; }
@keyframes recommendation-pulse { 50% { box-shadow: 0 0 0 .8rem rgba(255,209,102,0); } }
.recommendation small, .recommendation strong { display: block; }
.recommendation small { margin-bottom: var(--space-1); color: var(--color-warning); font-size: .65rem; font-weight: 800; letter-spacing: .14em; }
.recommendation strong { font-family: var(--font-display); font-size: 1.1rem; }
.chapter-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); counter-reset: chapter; }
.chapter-card { position: relative; overflow: hidden; display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-5); align-items: center; min-height: 9rem; padding: var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: rgba(13,27,42,.76); text-align: left; cursor: pointer; animation: card-in var(--motion-scene) var(--ease-out) both; animation-delay: calc(var(--index) * 45ms); transition: transform var(--motion-base) var(--ease-out), background var(--motion-fast), border var(--motion-fast); }
@keyframes card-in { from { opacity: 0; transform: translateY(1.2rem); } }
.chapter-card:hover { transform: translateY(-.25rem); border-color: var(--color-info); background: var(--color-surface-elevated); }
.chapter-card__code { display: grid; place-items: center; width: 3.25rem; height: 3.25rem; border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); color: var(--color-info); font-family: var(--font-mono); font-weight: 800; }
.chapter-card__copy strong { display: block; margin-bottom: var(--space-2); font-family: var(--font-display); font-size: 1.14rem; }
.chapter-card__copy span { color: var(--color-text-subtle); font-size: .82rem; }
.chapter-card__progress { position: relative; display: grid; place-items: center; width: 3rem; height: 3rem; border-radius: 50%; background: conic-gradient(var(--color-success) var(--progress), var(--color-border) 0); }
.chapter-card__progress::after { content: ""; width: 2.2rem; height: 2.2rem; border-radius: 50%; background: var(--color-surface); }
.chapter-card__progress span { position: absolute; z-index: 1; font-family: var(--font-mono); font-size: .63rem; }

.stage-wrap { max-width: 62rem; margin: 0 auto; }
.stage-top { display: grid; grid-template-columns: 1fr auto; gap: var(--space-8); align-items: start; margin-bottom: var(--space-8); }
.stage-meta { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; color: var(--color-text-subtle); font-size: .75rem; font-weight: 750; text-transform: uppercase; letter-spacing: .1em; }
.stage-meta__chapter { color: var(--color-info); }
.progress-line { width: 100%; height: .35rem; margin-top: var(--space-4); overflow: hidden; border-radius: var(--radius-pill); background: var(--color-border); }
.progress-line i { display: block; width: var(--progress); height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--color-info), var(--color-accent)); transition: width var(--motion-scene) var(--ease-out); }
.timer { display: grid; grid-template-columns: 2.8rem auto; gap: var(--space-3); align-items: center; min-width: 8.5rem; }
.timer-ring { --remaining: 100%; display: grid; place-items: center; width: 2.8rem; height: 2.8rem; border-radius: 50%; background: conic-gradient(var(--timer-color, var(--color-info)) var(--remaining), var(--color-border) 0); }
.timer-ring::after { content: ""; width: 2.1rem; height: 2.1rem; border-radius: 50%; background: var(--color-bg-deep); }
.timer time { font-family: var(--font-mono); font-size: 1.25rem; font-weight: 750; }
.timer small { display: block; color: var(--color-text-subtle); font-size: .62rem; letter-spacing: .1em; }
.question-card { position: relative; padding: clamp(1.3rem, 4vw, 3rem); border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: linear-gradient(145deg, rgba(19,37,58,.94), rgba(7,17,31,.96)); box-shadow: var(--shadow-card); }
.question-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: .22rem; border-radius: var(--radius-xl) 0 0 var(--radius-xl); background: linear-gradient(var(--color-info), var(--color-accent)); }
.question-card h1 { max-width: 50rem; margin: 0 0 var(--space-8); font-size: clamp(1.55rem, 3.2vw, 2.5rem); line-height: 1.2; letter-spacing: -.025em; }
.question-kind { display: inline-flex; margin-bottom: var(--space-4); padding: .38rem .65rem; border: 1px solid var(--color-border); border-radius: var(--radius-pill); color: var(--color-text-muted); font-size: .65rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.answers { display: grid; gap: var(--space-3); margin: 0; padding: 0; border: 0; }
.answer { position: relative; display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-4); align-items: center; min-height: 4rem; padding: var(--space-4) var(--space-5); overflow: hidden; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(3,9,20,.46); cursor: pointer; transition: transform var(--motion-fast), border var(--motion-fast), background var(--motion-fast); }
.answer:hover { transform: translateX(.22rem); border-color: var(--color-border-strong); background: rgba(19,37,58,.8); }
.answer input { position: absolute; opacity: 0; pointer-events: none; }
.answer__marker { display: grid; place-items: center; width: 1.35rem; height: 1.35rem; border: 2px solid var(--color-border-strong); border-radius: 50%; transition: border var(--motion-fast), background var(--motion-fast), box-shadow var(--motion-fast); }
.answer--multi .answer__marker { border-radius: .3rem; }
.answer input:checked + .answer__marker { border-color: var(--color-info); background: var(--color-info); box-shadow: inset 0 0 0 .25rem var(--color-surface); }
.answer--multi input:checked + .answer__marker { box-shadow: inset 0 0 0 .2rem var(--color-surface); }
.answer:has(input:focus-visible) { outline: .1875rem solid var(--color-focus); outline-offset: .1875rem; }
.answer.is-correct { border-color: var(--color-success); background: rgba(72,229,155,.09); }
.answer.is-wrong { border-color: var(--color-danger); background: rgba(255,107,122,.09); animation: answer-no var(--motion-base) var(--ease-out); }
@keyframes answer-no { 35% { transform: translateX(-.25rem); } 70% { transform: translateX(.2rem); } }
.answer__result { color: var(--color-success); font-weight: 800; }
.answer.is-wrong .answer__result { color: var(--color-danger); }
.validation { margin-top: var(--space-4); padding: var(--space-3) var(--space-4); border-left: .2rem solid var(--color-danger); background: rgba(255,107,122,.08); color: var(--color-danger); font-weight: 700; animation: panel-in var(--motion-base) var(--ease-out); }
.feedback { position: relative; margin-top: var(--space-5); padding: var(--space-5); border: 1px solid var(--feedback-color, var(--color-info)); border-radius: var(--radius-md); background: color-mix(in srgb, var(--feedback-color, var(--color-info)) 8%, transparent); animation: panel-in var(--motion-scene) var(--ease-out); }
@keyframes panel-in { from { opacity: 0; transform: translateY(-.6rem); } }
.feedback--correct { --feedback-color: var(--color-success); }
.feedback--wrong { --feedback-color: var(--color-danger); }
.feedback__title { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); font-family: var(--font-display); font-size: 1.15rem; font-weight: 800; }
.feedback p { margin-bottom: var(--space-3); color: var(--color-text-muted); line-height: 1.6; }
.feedback__source { color: var(--color-text-subtle); font-size: .75rem; }
.stage-actions { display: flex; justify-content: space-between; gap: var(--space-4); align-items: center; margin-top: var(--space-6); }

.button { display: inline-flex; justify-content: center; align-items: center; gap: var(--space-3); min-height: 3.25rem; padding: 0 var(--space-6); border: 1px solid transparent; border-radius: var(--radius-pill); background: var(--color-accent); color: var(--color-on-accent); font-weight: 850; cursor: pointer; transition: transform var(--motion-fast), background var(--motion-fast), border var(--motion-fast); }
.button:hover { transform: translateY(-.12rem); background: var(--color-accent-hover); }
.button:active { transform: translateY(.06rem); }
.button:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.button--secondary { background: var(--color-info); }
.button--ghost { border-color: var(--color-border); background: transparent; color: var(--color-text); }
.button--ghost:hover { background: var(--color-surface-elevated); }
.button--danger { background: var(--color-danger); color: var(--color-bg-deep); }
.button--wide { width: 100%; }

.gate { display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, .8fr); gap: clamp(2rem, 7vw, 6rem); align-items: center; max-width: 70rem; margin: 0 auto; }
.gate h1 { font-size: clamp(3rem, 7vw, 6rem); }
.rule-list { display: grid; gap: var(--space-3); margin: var(--space-8) 0; padding: 0; list-style: none; }
.rule-list li { display: grid; grid-template-columns: 2.5rem 1fr; gap: var(--space-4); align-items: center; padding: var(--space-4) 0; border-bottom: 1px solid var(--color-border); }
.rule-list strong { font-family: var(--font-mono); color: var(--color-info); }
.gate-panel { padding: var(--space-8); border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: rgba(13,27,42,.84); box-shadow: var(--shadow-pop); }
.gate-panel__ring { display: grid; place-items: center; width: 9rem; height: 9rem; margin: 0 auto var(--space-6); border-radius: 50%; background: conic-gradient(var(--color-accent) 80%, var(--color-border) 0); }
.gate-panel__ring::after { content: "80%"; display: grid; place-items: center; width: 7rem; height: 7rem; border-radius: 50%; background: var(--color-surface); font-family: var(--font-mono); font-size: 1.8rem; font-weight: 800; }
.gate-panel p { color: var(--color-text-muted); line-height: 1.6; text-align: center; }

.result-grid { display: grid; grid-template-columns: minmax(18rem, .65fr) minmax(0, 1.35fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.result-hero { position: sticky; top: 7rem; text-align: center; }
.result-ring { --score: 0%; display: grid; place-items: center; width: min(17rem, 70vw); aspect-ratio: 1; margin: 0 auto var(--space-6); border-radius: 50%; background: conic-gradient(var(--ring-color, var(--color-success)) var(--score), var(--color-border) 0); box-shadow: 0 0 5rem color-mix(in srgb, var(--ring-color, var(--color-success)) 18%, transparent); animation: result-pop var(--motion-slow) var(--ease-out) both; }
.result-ring::after { content: ""; position: absolute; width: min(13.5rem, 56vw); aspect-ratio: 1; border-radius: 50%; background: var(--color-bg-deep); }
.result-ring__value { position: relative; z-index: 1; font-family: var(--font-mono); font-size: clamp(2.5rem, 7vw, 4rem); font-weight: 850; }
@keyframes result-pop { from { opacity: 0; transform: scale(.8) rotate(-20deg); } }
.result-hero h1 { margin-bottom: var(--space-3); font-size: clamp(2.2rem, 5vw, 4rem); }
.result-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin: var(--space-8) 0; }
.result-summary .metric { border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.result-panel { padding: clamp(1.2rem, 4vw, 2.5rem); border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: rgba(13,27,42,.75); }
.result-panel h2 { margin-bottom: var(--space-6); }
.chapter-bars { display: grid; gap: var(--space-5); }
.chapter-bar__label { display: flex; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-2); color: var(--color-text-muted); font-size: .82rem; }
.chapter-bar__track { height: .5rem; border-radius: var(--radius-pill); background: var(--color-border); overflow: hidden; }
.chapter-bar__track i { display: block; width: var(--bar); height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--color-info), var(--color-success)); animation: bar-grow var(--motion-slow) var(--ease-out) both; }
@keyframes bar-grow { from { width: 0; } }
.result-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

.review-list { display: grid; gap: var(--space-3); max-width: 62rem; margin: 0 auto; }
.review-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(13,27,42,.72); overflow: hidden; }
.review-item summary { display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-4); align-items: center; min-height: 4.5rem; padding: var(--space-4) var(--space-5); cursor: pointer; list-style: none; }
.review-item summary::-webkit-details-marker { display: none; }
.review-state { display: grid; place-items: center; width: 1.8rem; height: 1.8rem; border-radius: 50%; background: var(--color-success); color: var(--color-bg-deep); font-weight: 900; }
.review-state--wrong { background: var(--color-danger); }
.review-state--empty { background: var(--color-warning); }
.review-item summary strong { font-size: .92rem; line-height: 1.45; }
.review-item summary span:last-child { color: var(--color-text-subtle); }
.review-body { padding: 0 var(--space-5) var(--space-5) 4.8rem; animation: panel-in var(--motion-base) var(--ease-out); }
.review-body p { color: var(--color-text-muted); line-height: 1.6; }
.review-answer { padding: var(--space-3); border-left: .2rem solid var(--color-info); background: rgba(89,217,255,.06); }

.certificate { max-width: 55rem; margin: 0 auto; }
.certificate-card { position: relative; overflow: hidden; padding: clamp(2rem, 7vw, 5rem); border: 1px solid var(--color-border-strong); border-radius: var(--radius-xl); background: linear-gradient(145deg, var(--color-surface-elevated), var(--color-bg-deep)); box-shadow: var(--shadow-pop); }
.certificate-card::before, .certificate-card::after { content: ""; position: absolute; width: 12rem; height: .18rem; background: linear-gradient(90deg, var(--color-accent), var(--color-info)); transform: rotate(-45deg); }
.certificate-card::before { top: 2rem; right: -4rem; }
.certificate-card::after { bottom: 2rem; left: -4rem; }
.certificate-form { display: grid; gap: var(--space-5); margin-top: var(--space-8); }
.field { display: grid; gap: var(--space-2); }
.field label { color: var(--color-text-muted); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.field input { min-height: 3.5rem; padding: 0 var(--space-4); border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: rgba(3,9,20,.62); color: var(--color-text); }
.certificate-output { text-align: center; }
.certificate-output__score { margin: var(--space-8) 0; font-family: var(--font-mono); font-size: 4rem; font-weight: 850; color: var(--color-success); }
.certificate-output__name { margin: var(--space-8) 0 var(--space-2); font-size: clamp(2rem, 5vw, 3.5rem); }
.certificate-output__org { color: var(--color-text-muted); font-size: 1.2rem; }
.certificate-output__legal { margin-top: var(--space-10); padding-top: var(--space-4); border-top: 1px solid var(--color-border); color: var(--color-warning); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }

.catalog { max-width: 78rem; margin: 0 auto; }
.catalog-metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-3); margin-bottom: var(--space-8); }
.catalog-metrics .metric { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(13,27,42,.58); }
.catalog-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.catalog-panel { position: relative; min-height: 18rem; padding: var(--space-8); overflow: hidden; border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: linear-gradient(145deg, rgba(19,37,58,.88), rgba(7,17,31,.88)); box-shadow: var(--shadow-card); }
.catalog-panel::after { content: ""; position: absolute; right: -5rem; bottom: -7rem; width: 15rem; height: 15rem; border: 1px solid rgba(89,217,255,.12); border-radius: 50%; box-shadow: 0 0 0 2rem rgba(89,217,255,.025), 0 0 0 4rem rgba(89,217,255,.018); }
.catalog-panel h2 { margin-top: var(--space-5); }
.catalog-panel p { max-width: 34rem; color: var(--color-text-muted); line-height: 1.6; }
.catalog-step { display: inline-flex; align-items: center; justify-content: center; width: 2.4rem; height: 2.4rem; border: 1px solid var(--color-info); border-radius: 50%; color: var(--color-info); font-family: var(--font-mono); font-size: .72rem; }
.catalog-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }
.file-drop { position: relative; z-index: 1; display: grid; place-items: center; min-height: 8.5rem; margin-top: var(--space-6); border: 1px dashed var(--color-border-strong); border-radius: var(--radius-lg); background: rgba(3,9,20,.36); cursor: pointer; transition: border var(--motion-fast), background var(--motion-fast), transform var(--motion-base); }
.file-drop:hover { transform: translateY(-.2rem); border-color: var(--color-info); background: rgba(89,217,255,.05); }
.file-drop > span { color: var(--color-info); font-size: 1.8rem; }
.file-drop strong, .file-drop small { display: block; text-align: center; }
.file-drop small { color: var(--color-text-subtle); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.import-preview { margin-top: var(--space-6); padding: clamp(1.2rem, 4vw, 2.5rem); border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: rgba(13,27,42,.78); box-shadow: var(--shadow-card); animation: panel-in var(--motion-scene) var(--ease-out); }
.import-preview__head { display: flex; justify-content: space-between; align-items: start; gap: var(--space-6); }
.import-preview__head h2 { margin-bottom: var(--space-5); }
.import-badges { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-2); }
.badge { padding: .45rem .7rem; border: 1px solid var(--color-border); border-radius: var(--radius-pill); font-family: var(--font-mono); font-size: .68rem; }
.badge--success { border-color: rgba(72,229,155,.4); color: var(--color-success); }
.badge--danger { border-color: rgba(255,107,122,.4); color: var(--color-danger); }
.badge--warning { border-color: rgba(255,209,102,.4); color: var(--color-warning); }
.import-messages { margin-bottom: var(--space-4); padding: var(--space-4); border-left: .2rem solid var(--color-info); background: rgba(89,217,255,.05); }
.import-messages strong { display: block; margin-bottom: var(--space-2); }
.import-messages p { margin: var(--space-1) 0; color: var(--color-text-muted); font-size: .82rem; line-height: 1.45; }
.import-messages--error { border-color: var(--color-danger); background: rgba(255,107,122,.06); }
.import-messages--error strong { color: var(--color-danger); }
.import-messages--ok { border-color: var(--color-success); background: rgba(72,229,155,.06); }
.import-messages--ok strong { color: var(--color-success); }
.import-messages--warning { border-color: var(--color-warning); background: rgba(255,209,102,.05); }
.table-scroll { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.catalog-table { width: 100%; border-collapse: collapse; min-width: 48rem; }
.catalog-table th, .catalog-table td { padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
.catalog-table th { color: var(--color-text-subtle); background: rgba(3,9,20,.55); font-size: .65rem; letter-spacing: .1em; text-transform: uppercase; }
.catalog-table td { color: var(--color-text-muted); font-size: .78rem; line-height: 1.45; }
.catalog-table td:nth-child(4) { min-width: 19rem; color: var(--color-text); }
.catalog-table tr:last-child td { border-bottom: 0; }
.import-apply { display: flex; justify-content: flex-end; align-items: center; gap: var(--space-3); margin-top: var(--space-5); }
.import-apply label { color: var(--color-text-subtle); font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.import-apply select { min-height: 3rem; padding: 0 var(--space-4); border: 1px solid var(--color-border-strong); border-radius: var(--radius-pill); background: var(--color-bg-deep); color: var(--color-text); }

.toast-region { position: fixed; right: var(--space-5); bottom: var(--space-5); z-index: 60; display: grid; gap: var(--space-2); }
.toast { max-width: 22rem; padding: var(--space-4) var(--space-5); border: 1px solid var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface-elevated); box-shadow: var(--shadow-pop); animation: toast-in var(--motion-base) var(--ease-out) both; }
@keyframes toast-in { from { opacity: 0; transform: translateX(2rem); } }
.confirm-dialog { max-width: 31rem; padding: 0; border: 1px solid var(--color-border-strong); border-radius: var(--radius-xl); background: var(--color-surface); color: var(--color-text); box-shadow: var(--shadow-pop); }
.confirm-dialog::backdrop { background: var(--color-overlay); backdrop-filter: blur(.4rem); }
.confirm-dialog form { padding: var(--space-8); }
.confirm-dialog p { color: var(--color-text-muted); line-height: 1.6; }
.dialog-actions { display: flex; justify-content: flex-end; gap: var(--space-3); margin-top: var(--space-6); }

body.exam-active .ambient__grid,
body.exam-active .ambient__orb,
body.exam-active .signal-axis { animation-play-state: paused; }

@media (max-width: 56rem) {
  .hero, .gate, .result-grid { grid-template-columns: 1fr; }
  .hero { align-items: start; }
  .mode-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mode-card { grid-template-columns: 1fr; align-content: space-between; min-height: 13rem; }
  .arrow { justify-self: end; }
  .result-hero { position: static; }
  .chapter-grid { grid-template-columns: 1fr; }
  .catalog-grid { grid-template-columns: 1fr; }
  .catalog-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 42rem) {
  .app-header { grid-template-columns: 1fr auto; min-height: 3.75rem; padding-inline: var(--space-4); }
  .header-status { position: fixed; top: 3.75rem; left: 0; width: 100%; min-height: 2rem; padding: 0 var(--space-4); background: rgba(3,9,20,.88); }
  .icon-button__label { display: none; }
  #app-main { min-height: calc(100vh - 3.75rem); padding-top: 4rem; }
  .hero__meta, .result-summary { grid-template-columns: 1fr; }
  .mode-grid { grid-template-columns: 1fr; }
  .mode-card { min-height: 9rem; grid-template-columns: auto 1fr auto; }
  .section-head { display: block; }
  .section-head__aside { margin-top: var(--space-4); }
  .chapter-card { grid-template-columns: auto 1fr; }
  .chapter-card__progress { display: none; }
  .question-card { border-radius: var(--radius-lg); }
  .stage-top { grid-template-columns: 1fr; gap: var(--space-4); }
  .timer { grid-row: 1; }
  .stage-actions { position: sticky; bottom: 0; z-index: 10; margin: var(--space-6) calc(var(--space-4) * -1) calc(var(--space-16) * -1); padding: var(--space-4); border-top: 1px solid var(--color-border); background: rgba(3,9,20,.94); backdrop-filter: blur(1rem); }
  .stage-actions .button { flex: 1; }
  .review-body { padding-left: var(--space-5); }
  .dialog-actions { flex-direction: column; }
  .catalog-metrics { grid-template-columns: 1fr; }
  .import-preview__head, .import-apply { align-items: stretch; flex-direction: column; }
  .import-badges { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
}

body.reduce-motion *, body.reduce-motion *::before, body.reduce-motion *::after { animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }

@media print {
  body { background: white; color: #111; }
  .app-header, .ambient, .certificate > .section-head, .certificate-form, .result-actions, .toast-region { display: none !important; }
  #app-main { width: 100%; padding: 0; }
  .certificate-card { min-height: 95vh; display: grid; place-items: center; border: .12rem solid #111; border-radius: 0; background: white; color: #111; box-shadow: none; }
  .certificate-output__org, .certificate-output__legal { color: #333; }
}

/* Version 4: Lernsystem-Editor */
.mode-card--studio{--card-accent:#a78bfa}.studio,.studio-editor{max-width:1440px}.studio-toolbar,.editor-head{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;margin:1.5rem 0 2rem}.studio-toolbar>div{display:grid;gap:.3rem}.studio-toolbar span{color:var(--color-text-muted);font-size:.85rem}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.course-card{position:relative;display:flex;flex-direction:column;min-height:320px;padding:1.4rem;border:1px solid var(--color-border);border-radius:var(--radius-lg);background:linear-gradient(145deg,rgba(17,30,49,.96),rgba(8,18,32,.94));overflow:hidden}.course-card:before{content:"";position:absolute;inset:0 auto 0 0;width:4px;background:var(--course-accent)}.course-card.is-active{box-shadow:0 0 0 1px var(--course-accent),0 24px 60px rgba(0,0,0,.28)}.course-card__top,.course-card__actions,.course-card__stats{display:flex;align-items:center;gap:.65rem}.course-card__top{justify-content:space-between}.course-card h2{font-size:1.35rem;margin:1.2rem 0 .55rem}.course-card p{color:var(--color-text-muted);line-height:1.55}.course-card__stats{margin:auto 0 1rem;flex-wrap:wrap}.course-card__stats span{padding:.45rem .6rem;border:1px solid var(--color-border);border-radius:999px;font-size:.75rem;color:var(--color-text-muted)}.course-card__stats strong{color:var(--color-text)}.course-card__actions{border-top:1px solid var(--color-border);padding-top:1rem}.status-pill{display:inline-flex;align-items:center;width:max-content;padding:.3rem .55rem;border-radius:999px;font-size:.68rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;background:rgba(148,163,184,.14);color:#cbd5e1}.status-pill--published{background:rgba(52,211,153,.14);color:#6ee7b7}.status-pill--testing{background:rgba(34,211,238,.14);color:#67e8f9}.status-pill--archived{opacity:.6}.course-warning,.course-ready{font-size:.78rem!important;margin:.1rem 0 .9rem!important}.course-warning{color:#fbbf24!important}.course-ready{color:#6ee7b7!important}.button--small{min-height:38px;padding:.55rem .8rem;font-size:.78rem}.editor-head{align-items:flex-end}.editor-head h1{margin:.45rem 0 0}.editor-head__actions{display:flex;gap:.7rem}.back-link{border:0;background:transparent;color:var(--color-info);padding:0;margin-bottom:.8rem;cursor:pointer}.editor-layout{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:1.25rem;align-items:start}.editor-main{display:grid;gap:1.25rem}.editor-sidebar{display:grid;gap:1.25rem;position:sticky;top:100px}.editor-panel{padding:1.35rem;border:1px solid var(--color-border);border-radius:var(--radius-lg);background:rgba(9,20,35,.92)}.panel-title{display:flex;align-items:center;gap:.9rem;margin-bottom:1.2rem}.panel-title h2,.panel-title p{margin:0}.panel-title p{color:var(--color-text-muted);font-size:.82rem;margin-top:.2rem}.panel-title--split{justify-content:space-between}.panel-title--split>.panel-title{margin:0}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.field{display:grid;gap:.42rem}.field--wide{grid-column:1/-1}.field>span{font-size:.73rem;font-weight:750;letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-muted)}.field input,.field textarea,.field select,.inline-form input{width:100%;border:1px solid var(--color-border);border-radius:10px;background:#081323;color:var(--color-text);padding:.8rem .9rem;font:inherit}.field textarea{resize:vertical}.field input:focus,.field textarea:focus,.field select:focus,.inline-form input:focus{outline:2px solid var(--color-info);outline-offset:1px}.field small{color:var(--color-text-muted)}.form-actions{display:flex;justify-content:flex-end;gap:.7rem;margin-top:.3rem}.toggle-field{display:flex;gap:.65rem;align-items:center;margin:.8rem 0;color:var(--color-text-muted);font-size:.88rem}.editor-sidebar h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin:1.35rem 0 .75rem}.chapter-editor-list,.question-editor-list{display:grid;gap:.55rem}.chapter-editor-row{display:grid;grid-template-columns:48px 1fr auto 40px;align-items:center;gap:.8rem;padding:.75rem;border:1px solid var(--color-border);border-radius:12px}.chapter-editor-row div{display:grid}.chapter-editor-row small{color:var(--color-text-muted);margin-top:.25rem}.chapter-code{display:grid;place-items:center;aspect-ratio:1;border-radius:9px;background:rgba(34,211,238,.1);font-weight:800;color:var(--color-info)}.inline-form{display:grid;grid-template-columns:100px 1fr 1.4fr auto;gap:.6rem;margin-top:1rem}.question-editor-row{display:grid;grid-template-columns:68px minmax(0,1fr) auto 20px;align-items:center;gap:.8rem;width:100%;padding:.85rem;border:1px solid var(--color-border);border-radius:12px;background:rgba(5,15,27,.65);color:var(--color-text);text-align:left;cursor:pointer}.question-editor-row:hover{border-color:var(--color-info);transform:translateX(3px)}.question-editor-row>span:nth-child(2){display:grid;gap:.25rem}.question-editor-row small{color:var(--color-text-muted)}.readiness-panel{padding:1rem 1.2rem;margin-bottom:1.2rem;border:1px solid rgba(251,191,36,.35);border-radius:12px;background:rgba(251,191,36,.07);color:#fde68a}.readiness-panel ul{margin:.5rem 0 0;padding-left:1.2rem}.danger-zone{display:grid;gap:.65rem}.empty-state{text-align:center;padding:2.5rem;color:var(--color-text-muted)}.question-form{max-width:980px;margin:auto}.question-form .form-actions{margin-top:1.2rem}
@media(max-width:1100px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.editor-layout{grid-template-columns:1fr}.editor-sidebar{position:static;grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){.course-grid{grid-template-columns:1fr}.studio-toolbar,.editor-head{align-items:stretch;flex-direction:column}.editor-head__actions{display:grid}.form-grid{grid-template-columns:1fr}.field--wide{grid-column:auto}.editor-sidebar{grid-template-columns:1fr}.inline-form{grid-template-columns:1fr}.chapter-editor-row{grid-template-columns:42px 1fr 36px}.chapter-editor-row>span:nth-child(3){display:none}.question-editor-row{grid-template-columns:55px minmax(0,1fr) 20px}.question-editor-row .status-pill{display:none}}

.studio-toolbar__actions{display:flex!important;flex-direction:row;gap:.65rem}.course-import{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin:-.7rem 0 1.5rem;padding:1rem 1.2rem;border:1px solid rgba(52,211,153,.35);border-radius:12px;background:rgba(52,211,153,.07)}.course-import>div{display:flex;align-items:center;gap:.7rem}.course-import span{display:block;margin-top:.25rem;color:var(--color-text-muted);font-size:.8rem}.course-import--error{border-color:rgba(255,107,122,.4);background:rgba(255,107,122,.07)}.version-list{display:grid;gap:.55rem}.version-list>div{display:flex;align-items:center;justify-content:space-between;gap:.6rem;padding:.65rem;border:1px solid var(--color-border);border-radius:10px}.version-list span{display:grid;gap:.15rem}.version-list small{color:var(--color-text-muted)}
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.hotspot-stage,.hotspot-editor-stage{position:relative;display:block;width:100%;padding:0;overflow:hidden;border:2px solid var(--color-border);border-radius:14px;background:#030914;cursor:crosshair}.hotspot-stage img,.hotspot-editor-stage img{display:block;width:100%;height:auto;max-height:34rem;object-fit:contain}.hotspot-marker{position:absolute;width:22px;height:22px;border:3px solid white;border-radius:50%;background:var(--color-accent);box-shadow:0 0 0 5px rgba(255,106,42,.25);transform:translate(-50%,-50%)}.hotspot-solution{position:absolute;border:3px solid var(--color-success);border-radius:50%;background:rgba(52,211,153,.15);transform:translate(-50%,-50%)}.hotspot-editor-fields{padding:1rem;border:1px solid var(--color-border);border-radius:12px;background:rgba(34,211,238,.04)}.hotspot-editor-fields>label{display:grid;gap:.4rem}.hotspot-editor-fields select,.hotspot-values input{width:100%;padding:.75rem;border:1px solid var(--color-border-strong);border-radius:9px;background:var(--color-bg-deep);color:var(--color-text)}.hotspot-values{display:grid;grid-template-columns:repeat(3,1fr);gap:.7rem}.hotspot-values label{display:grid;gap:.35rem}.hotspot-values span{color:var(--color-text-muted);font-size:.72rem}.hotspot-editor-stage{--hotspot-x:50%;--hotspot-y:50%;--hotspot-radius:10%}.hotspot-editor-stage>span{position:absolute;left:var(--hotspot-x);top:var(--hotspot-y);width:calc(var(--hotspot-radius) * 2);aspect-ratio:1;border:3px solid var(--color-accent);border-radius:50%;background:rgba(255,106,42,.18);transform:translate(-50%,-50%)}
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@media(max-width:860px){.media-editor-layout{grid-template-columns:1fr}.crop-controls{position:static}}