/*!
 * Udaan, © 2026 Shoolini University. All rights reserved.
 * Designed & built in-house by Divya Mohan · AI Product Developer · Shoolini Online.
 * Portfolio https://dmj.one/work/ · Proprietary & confidential, see /COPYRIGHT.
 * SPDX-License-Identifier: LicenseRef-Shoolini-Proprietary
 */
/* ============================================================================
 * UdaanSprint, the 7-second drill deck.
 *
 * Identity: a reels-style vertical deck that feels like a launch console at
 * night. Deep indigo space, a hairline cyan/amber thrust gauge climbing the
 * left rail, monospace code on glass, one card per screen with CSS scroll-snap
 * so the browser does the reels paging (no JS animation loop). Tactile, premium,
 * and unmistakably Udaan (the rocket motif), never a generic quiz.
 *
 * Perf: transforms + opacity + scroll-snap only. NO animated blur, NO filter
 * animation, NO rAF loop. Honors prefers-reduced-motion (and a forced
 * .sprint-reduced class). Self-contained: scoped under .sprint-root, reuses the
 * app's CSS custom properties (--ink, --accent, …) so it tracks light/dark.
 * ========================================================================== */

.sprint-root {
  /* a self-contained dark stage even in the app's light theme: Sprint is a
     focused, full-immersion mode, like a cinema dimming the room. */
  --sp-space:    #0B0C1A;
  --sp-space-2:  #14162B;
  --sp-glass:    rgba(255, 255, 255, 0.04);
  --sp-glass-2:  rgba(255, 255, 255, 0.07);
  --sp-line:     rgba(255, 255, 255, 0.10);
  --sp-ink:      #ECECF5;
  --sp-ink-soft: #A6A7C0;
  --sp-cyan:     #5EE6D0;
  --sp-amber:    var(--accent, #F59E0B);
  --sp-pink:     var(--accent-warm, #FB7185);
  --sp-ok:       #4ADE80;
  --sp-no:       #FB7185;
  --sp-mono: 'SFMono-Regular', ui-monospace, 'Cascadia Code', 'Consolas', 'Liberation Mono', monospace;

  position: relative;
  display: block;
  width: 100%;
  min-height: 70vh;
  border-radius: 22px;
  overflow: hidden;
  background:
    radial-gradient(120% 80% at 50% -10%, #1d2247 0%, transparent 60%),
    radial-gradient(80% 60% at 90% 110%, #1a1430 0%, transparent 55%),
    linear-gradient(180deg, var(--sp-space-2), var(--sp-space));
  color: var(--sp-ink);
  -webkit-font-smoothing: antialiased;
  box-shadow: inset 0 0 0 1px var(--sp-line), 0 30px 80px -40px rgba(0, 0, 0, 0.7);
  isolation: isolate;
}
/* a faint star/grain field via a single static radial-dot pattern (cheap). */
.sprint-root::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.35), transparent),
    radial-gradient(1px 1px at 70% 60%, rgba(255,255,255,.25), transparent),
    radial-gradient(1px 1px at 40% 80%, rgba(255,255,255,.20), transparent),
    radial-gradient(1px 1px at 85% 20%, rgba(255,255,255,.30), transparent),
    radial-gradient(1px 1px at 55% 15%, rgba(255,255,255,.18), transparent);
  opacity: .7;
}

/* ---- the deck: a scroll-snap column, the browser pages the reels ---------- */
.sprint-deck {
  position: relative; z-index: 1;
  height: 78vh; max-height: 760px;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  outline: none;
}
.sprint-deck::-webkit-scrollbar { width: 0; height: 0; }

/* ---- the left-rail fuel gauge: correct reps build thrust ------------------ */
.sprint-gauge {
  position: absolute; z-index: 3; left: 14px; top: 18%; bottom: 18%;
  width: 5px; border-radius: 999px;
  background: var(--sp-glass-2);
  box-shadow: inset 0 0 0 1px var(--sp-line);
  overflow: hidden;
}
.sprint-gauge-fill {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 0%;
  background: linear-gradient(180deg, var(--sp-cyan), var(--sp-amber));
  box-shadow: 0 0 14px 1px rgba(94, 230, 208, 0.55);
  transition: height .5s cubic-bezier(.22,.61,.36,1);
}
.sprint-counter {
  position: absolute; z-index: 3; right: 16px; top: 16px;
  font: 700 12px/1 var(--sp-mono);
  letter-spacing: .08em;
  color: var(--sp-ink-soft);
  padding: 6px 9px; border-radius: 999px;
  background: var(--sp-glass); box-shadow: inset 0 0 0 1px var(--sp-line);
}

/* ---- a card: exactly one screen, snapping into place --------------------- */
.sprint-card {
  scroll-snap-align: start; scroll-snap-stop: always;
  min-height: 78vh; max-height: 760px;
  display: grid; place-items: center;
  padding: 40px 26px 40px 40px;
  outline: none;
}
.sprint-card-in {
  width: 100%; max-width: 560px;
  display: flex; flex-direction: column; gap: 16px;
  opacity: 0; transform: translateY(18px);
  animation: sp-card-in .5s cubic-bezier(.22,.61,.36,1) forwards;
}
@keyframes sp-card-in { to { opacity: 1; transform: none; } }

.sprint-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.sprint-prompt {
  font: 700 clamp(20px, 3.4vw, 30px)/1.1 'Space Grotesk', var(--font, sans-serif);
  letter-spacing: -0.01em;
  background: linear-gradient(100deg, var(--sp-cyan), #c9d3ff 60%, var(--sp-ink));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sprint-stage {
  flex-shrink: 0;
  font: 700 11px/1 var(--sp-mono); letter-spacing: .06em; text-transform: uppercase;
  padding: 6px 10px; border-radius: 999px;
  background: var(--sp-glass-2); color: var(--sp-ink-soft);
  box-shadow: inset 0 0 0 1px var(--sp-line);
}
.sprint-st-A { color: #9DE5C4; }
.sprint-st-B { color: var(--sp-amber); }
.sprint-st-C { color: var(--sp-pink); }

.sprint-task {
  margin: 0; color: var(--sp-ink-soft);
  font-size: clamp(14px, 1.8vw, 16px); line-height: 1.5;
}

/* the example input + the code, on dark glass */
.sprint-given {
  display: flex; align-items: center; gap: 10px;
  font: 600 13px/1 var(--sp-mono);
}
.sprint-lbl {
  font: 700 10px/1 var(--sp-mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--sp-ink-soft);
}
.sprint-given-code {
  padding: 7px 10px; border-radius: 8px;
  background: var(--sp-glass-2); color: var(--sp-cyan);
  box-shadow: inset 0 0 0 1px var(--sp-line);
  white-space: pre-wrap; word-break: break-word;
}
.sprint-code {
  margin: 0; padding: 16px 18px; border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(94,230,208,.05), transparent 40%),
    rgba(0, 0, 0, 0.32);
  box-shadow: inset 0 0 0 1px var(--sp-line), 0 10px 30px -18px rgba(0,0,0,.8);
  overflow-x: auto;
}
.sprint-code code {
  font: 500 clamp(13px, 1.9vw, 15.5px)/1.6 var(--sp-mono);
  color: #DCE3FF; white-space: pre;
}
/* the blank in a fill-blank card stands out without us touching the text node */
.sprint-k-fillblank .sprint-code code { color: #DCE3FF; }

/* ---- the choices: tactile mission buttons -------------------------------- */
.sprint-choices { display: grid; gap: 10px; margin-top: 4px; }
.sprint-choice {
  appearance: none; -webkit-appearance: none;
  text-align: left; cursor: pointer;
  font: 600 clamp(14px, 2vw, 16px)/1.3 var(--sp-mono);
  color: var(--sp-ink);
  padding: 14px 16px; border-radius: 13px;
  border: 1px solid var(--sp-line);
  background: linear-gradient(180deg, var(--sp-glass-2), var(--sp-glass));
  box-shadow: 0 1px 0 rgba(255,255,255,.04), 0 8px 22px -16px rgba(0,0,0,.9);
  transition: transform .14s cubic-bezier(.22,.61,.36,1), box-shadow .14s, border-color .14s, background .14s;
  word-break: break-word;
}
.sprint-choice:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: rgba(94,230,208,.5);
  box-shadow: 0 0 0 1px rgba(94,230,208,.25), 0 12px 26px -16px rgba(0,0,0,.9);
}
.sprint-choice:active:not(:disabled) { transform: translateY(0) scale(.99); }
.sprint-choice:focus-visible {
  outline: 2px solid var(--sp-cyan); outline-offset: 2px;
}
.sprint-choice:disabled { cursor: default; }
.sprint-choice.is-answer {
  border-color: var(--sp-ok);
  background: linear-gradient(180deg, rgba(74,222,128,.18), rgba(74,222,128,.06));
  color: #DDFBE7;
  box-shadow: 0 0 0 1px rgba(74,222,128,.4), 0 0 26px -6px rgba(74,222,128,.5);
}
.sprint-choice.is-wrong {
  border-color: var(--sp-no);
  background: linear-gradient(180deg, rgba(251,113,133,.16), rgba(251,113,133,.05));
  color: #FFE2E8;
  animation: sp-shake .32s ease;
}
@keyframes sp-shake {
  0%,100% { transform: translateX(0); }
  25% { transform: translateX(-5px); } 75% { transform: translateX(5px); }
}

/* ---- the verdict + next ---- */
.sprint-verdict {
  display: none; flex-direction: column; gap: 2px;
  padding: 12px 14px; border-radius: 12px;
  font-size: 14px;
}
.sprint-verdict[aria-hidden="false"] { display: flex; animation: sp-card-in .3s ease forwards; }
.sprint-verdict.ok { background: rgba(74,222,128,.10); box-shadow: inset 0 0 0 1px rgba(74,222,128,.3); }
.sprint-verdict.no { background: rgba(251,113,133,.10); box-shadow: inset 0 0 0 1px rgba(251,113,133,.3); }
.sprint-verdict-head { font: 700 13px/1 var(--sp-mono); letter-spacing: .04em; }
.sprint-verdict.ok .sprint-verdict-head { color: var(--sp-ok); }
.sprint-verdict.no .sprint-verdict-head { color: var(--sp-no); }
.sprint-verdict-body { color: var(--sp-ink-soft); font-size: 13.5px; }

.sprint-next { display: none; }
.sprint-next[aria-hidden="false"] { display: block; }
.sprint-next-btn {
  appearance: none; -webkit-appearance: none; cursor: pointer; width: 100%;
  font: 700 15px/1 'Space Grotesk', var(--font, sans-serif);
  color: #0B0C1A;
  padding: 14px 16px; border: 0; border-radius: 13px;
  background: linear-gradient(100deg, var(--sp-cyan), #9af0e2);
  box-shadow: 0 10px 28px -12px rgba(94,230,208,.7);
  transition: transform .14s, box-shadow .14s, filter .14s;
}
.sprint-next-btn:hover { transform: translateY(-2px); filter: brightness(1.05); }
.sprint-next-btn:active { transform: translateY(0); }
.sprint-next-btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.sprint-next-btn span { display: inline-block; margin-left: 4px; animation: sp-bob 1.4s ease-in-out infinite; }
@keyframes sp-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-3px); } }

/* ---- finale card ---- */
.sprint-finale .sprint-fin-in { text-align: center; align-items: center; gap: 12px; }
.sprint-fin-rocket { font-size: 56px; animation: sp-rise 2.4s ease-in-out infinite; }
@keyframes sp-rise { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.sprint-fin-h {
  margin: 0; font: 800 clamp(26px,5vw,40px)/1 'Space Grotesk', var(--font, sans-serif);
  letter-spacing: -.02em;
  background: linear-gradient(100deg, var(--sp-cyan), var(--sp-amber));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sprint-fin-score { margin: 0; color: var(--sp-ink-soft); font-size: 15px; }
.sprint-restart {
  margin-top: 8px; cursor: pointer;
  font: 700 14px/1 'Space Grotesk', var(--font, sans-serif); color: var(--sp-ink);
  padding: 12px 22px; border-radius: 13px;
  border: 1px solid var(--sp-line);
  background: linear-gradient(180deg, var(--sp-glass-2), var(--sp-glass));
  transition: transform .14s, border-color .14s;
}
.sprint-restart:hover { transform: translateY(-2px); border-color: rgba(94,230,208,.5); }
.sprint-restart:focus-visible { outline: 2px solid var(--sp-cyan); outline-offset: 2px; }

/* ---- loading / message shells ---- */
.sprint-shell { position: relative; z-index: 1; display: grid; place-items: center; min-height: 70vh; padding: 30px; }
.sprint-load { text-align: center; color: var(--sp-ink-soft); }
.sprint-load p { margin: 16px 0 0; font: 600 14px/1 var(--sp-mono); letter-spacing: .04em; }
.sprint-thrust {
  display: block; width: 44px; height: 44px; margin: 0 auto; border-radius: 50%;
  border: 3px solid var(--sp-line); border-top-color: var(--sp-cyan);
  animation: sp-spin .9s linear infinite;
}
@keyframes sp-spin { to { transform: rotate(360deg); } }
.sprint-msg { text-align: center; max-width: 360px; }
.sprint-msg h2 { margin: 0 0 8px; font: 700 22px/1.1 'Space Grotesk', var(--font, sans-serif); color: var(--sp-ink); }
.sprint-msg p { margin: 0 0 18px; color: var(--sp-ink-soft); font-size: 14.5px; }
.sprint-retry {
  cursor: pointer; font: 700 14px/1 'Space Grotesk', var(--font, sans-serif); color: #0B0C1A;
  padding: 12px 22px; border: 0; border-radius: 13px;
  background: linear-gradient(100deg, var(--sp-cyan), #9af0e2);
}
.sprint-retry:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

/* the screen-reader-only live region */
.sprint-sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---- reduced motion: keep every cue, drop the movement ------------------- */
@media (prefers-reduced-motion: reduce) {
  .sprint-deck { scroll-behavior: auto; }
  .sprint-card-in, .sprint-verdict[aria-hidden="false"] { animation: none; opacity: 1; transform: none; }
  .sprint-choice.is-wrong { animation: none; }
  .sprint-fin-rocket, .sprint-next-btn span, .sprint-thrust { animation: none; }
  .sprint-gauge-fill { transition: none; }
  .sprint-choice, .sprint-next-btn, .sprint-restart { transition: none; }
}
.sprint-reduced .sprint-card-in,
.sprint-reduced .sprint-verdict[aria-hidden="false"] { animation: none; opacity: 1; transform: none; }
.sprint-reduced .sprint-fin-rocket,
.sprint-reduced .sprint-next-btn span,
.sprint-reduced .sprint-thrust { animation: none; }
.sprint-reduced .sprint-gauge-fill { transition: none; }

/* small screens: full-bleed feel */
@media (max-width: 560px) {
  .sprint-root { border-radius: 16px; }
  .sprint-card { padding: 32px 18px 32px 34px; }
  .sprint-gauge { left: 10px; }
}