:root {
  --bg-top: #17376b;
  --bg-mid: #0d2349;
  --bg-low: #08142f;
  --card-bg: rgba(255, 255, 255, 0.1);
  --card-border: rgba(255, 255, 255, 0.24);
  --text-main: #fff8f2;
  --text-soft: rgba(255, 248, 242, 0.88);
  --accent-a: #ffd56f;
  --accent-b: #ff7f8b;
  --accent-c: #6fe2ff;
  --ink-dark: #2e1f3a;
  --ok: #a8f2b5;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  width: 100%;
  overflow-x: hidden;
}

body {
  font-family: "Trebuchet MS", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at 12% 15%, rgba(134, 188, 255, 0.24), transparent 46%),
    radial-gradient(circle at 86% 6%, rgba(88, 151, 255, 0.24), transparent 42%),
    radial-gradient(circle at 50% 100%, rgba(120, 184, 255, 0.14), transparent 56%),
    linear-gradient(160deg, var(--bg-top), var(--bg-mid) 52%, var(--bg-low));
}

.page {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding:
    clamp(12px, 2.4vh, 32px)
    clamp(12px, 2.2vw, 26px)
    clamp(16px, 3vh, 36px);
}

.card {
  width: min(860px, 100%);
  max-width: 860px;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: clamp(18px, 2.8vw, 30px);
  padding: clamp(18px, 3.8vw, 34px);
  background: var(--card-bg);
  backdrop-filter: blur(7px);
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.42);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: url("https://www.transparenttextures.com/patterns/asfalt-dark.png");
  mix-blend-mode: soft-light;
  pointer-events: none;
  z-index: -1;
}

.step {
  animation: fade-up 420ms ease;
}

.hidden {
  display: none !important;
}

.intro-title {
  margin: 0;
  font-size: clamp(1.55rem, 2.2vw + 0.9rem, 2.9rem);
  line-height: 1.2;
  text-wrap: balance;
  opacity: 0;
  transform: translateY(30px);
  animation: rise-in 850ms cubic-bezier(0.2, 0.9, 0.2, 1) forwards;
}

.countdown-text,
.status-text,
.question-text,
.feedback {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.45;
}

.countdown-text {
  margin-top: 14px;
  font-size: clamp(1rem, 1vw + 0.75rem, 1.25rem);
}

#countdownValue {
  color: var(--accent-a);
  font-weight: 800;
}

.btn,
input {
  border-radius: 14px;
  font-size: clamp(0.95rem, 0.45vw + 0.85rem, 1.1rem);
}

.btn {
  margin-top: 16px;
  border: 1px solid rgba(135, 176, 255, 0.76);
  color: #ffffff;
  font-weight: 900;
  padding: 12px 18px;
  cursor: pointer;
  background: linear-gradient(145deg, #3f7df5, #295ecf);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  box-shadow: 0 10px 24px rgba(4, 12, 32, 0.4);
  transition: transform 120ms ease, filter 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.68;
  cursor: not-allowed;
}

.load-block {
  margin: 14px auto 0;
  width: min(560px, 100%);
}

.load-track {
  position: relative;
  height: clamp(34px, 5vw, 40px);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(6, 5, 14, 0.44);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
}

.load-fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(255, 124, 159, 0.82), rgba(255, 214, 114, 0.95));
  transition: width 2.25s linear;
}

.load-runner {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: clamp(1rem, 1vw + 0.72rem, 1.36rem);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.35));
  transition: left 2.25s linear;
}

.load-track.active .load-fill {
  width: 100%;
}

.load-track.active .load-runner {
  left: calc(100% - clamp(30px, 4vw, 34px));
}

.status-text {
  text-align: center;
  font-size: clamp(1rem, 0.8vw + 0.7rem, 1.2rem);
}

.question-text {
  margin-bottom: 12px;
  font-size: clamp(1.05rem, 0.8vw + 0.75rem, 1.25rem);
}

.answer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-main);
  outline: none;
}

input::placeholder {
  color: rgba(255, 255, 255, 0.55);
}

input:focus {
  border-color: rgba(111, 226, 255, 0.8);
  box-shadow: 0 0 0 3px rgba(111, 226, 255, 0.2);
}

.feedback {
  min-height: 1.45em;
  margin-top: 10px;
  font-weight: 700;
}

.section-title {
  margin: 0 0 14px;
  text-align: center;
  font-size: clamp(1.35rem, 1.2vw + 0.95rem, 2rem);
}

.wheel-shell {
  position: relative;
  width: min(440px, 84vw);
  margin: 0 auto;
}

.pointer {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 14px solid transparent;
  border-right: 14px solid transparent;
  border-top: 0;
  border-bottom: 30px solid #fff0a9;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.45));
  z-index: 3;
}

.wheel {
  --label-distance: clamp(102px, 24vw, 176px);
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 8px solid rgba(255, 255, 255, 0.84);
  background:
    conic-gradient(
      from -90deg,
      #ff8d9c 0deg 72deg,
      #ffa66e 72deg 144deg,
      #ffd56f 144deg 216deg,
      #9fd887 216deg 288deg,
      #7cc7ff 288deg 360deg
    );
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.35);
  transform: rotate(0deg);
}

.wheel-label {
  position: absolute;
  left: 50%;
  top: 50%;
  width: clamp(82px, 22vw, 138px);
  text-align: center;
  pointer-events: none;
  transform: translate(-50%, -50%) rotate(calc(-90deg + (var(--index) * 72deg) + 36deg)) translateY(calc(-1 * var(--label-distance)));
  transform-origin: center center;
}

.wheel-label span {
  display: inline-block;
  padding: 5px 8px;
  border-radius: 999px;
  font-size: clamp(0.72rem, 0.78vw + 0.56rem, 0.98rem);
  font-weight: 800;
  white-space: nowrap;
  color: #fff8f2;
  background: rgba(0, 0, 0, 0.28);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.55);
  transform: rotate(calc(90deg - (var(--index) * 72deg) - 36deg));
}

.wheel-label.i0 { --index: 0; }
.wheel-label.i1 { --index: 1; }
.wheel-label.i2 { --index: 2; }
.wheel-label.i3 { --index: 3; }
.wheel-label.i4 { --index: 4; }

.wheel-center {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 21%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: #ffffff;
  border: 4px solid rgba(0, 0, 0, 0.14);
  z-index: 2;
}

#spinButton {
  display: block;
  margin: 18px auto 0;
}

#wheelMessage {
  text-align: center;
}

.coupon-card {
  position: relative;
  width: min(580px, 100%);
  margin: 4px auto 12px;
  padding: clamp(18px, 3vw, 24px);
  border-radius: 24px;
  border: 2px dashed rgba(40, 73, 129, 0.26);
  background:
    radial-gradient(circle at 90% 14%, rgba(198, 222, 255, 0.58), transparent 34%),
    linear-gradient(145deg, #ffffff, #f4f9ff 52%, #ecf3ff);
  box-shadow: 0 20px 44px rgba(7, 20, 44, 0.24);
  overflow: hidden;
}

.coupon-card::before,
.coupon-card::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 26px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--bg-mid);
  transform: translateY(-50%);
}

.coupon-card::before {
  left: -13px;
}

.coupon-card::after {
  right: -13px;
}

.coupon-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.coupon-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: clamp(0.74rem, 0.6vw + 0.62rem, 0.9rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  color: #ffffff;
  background: linear-gradient(125deg, #ff8d9c, #ffb26f);
  box-shadow: 0 6px 16px rgba(88, 38, 38, 0.25);
}

.coupon-stars {
  color: #385f9f;
  font-weight: 900;
  letter-spacing: 0.2em;
}

.coupon-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
}

.coupon-title {
  margin: 10px 0 6px;
  color: var(--ink-dark);
  font-size: clamp(1.35rem, 1vw + 1rem, 1.9rem);
}

.coupon-card p {
  margin: 0;
  color: var(--ink-dark);
  line-height: 1.5;
  font-size: clamp(1rem, 0.6vw + 0.84rem, 1.16rem);
}

.coupon-card p + p {
  margin-top: 7px;
}

.coupon-icons {
  margin-top: 10px;
  color: #28446d;
  font-size: 1.1rem;
}

.coupon-code {
  margin-top: 12px;
  display: inline-block;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px dashed rgba(46, 31, 58, 0.35);
  color: var(--ink-dark);
  font-weight: 800;
  letter-spacing: 0.03em;
  background: rgba(255, 255, 255, 0.96);
}

.coupon-qr-wrap {
  text-align: center;
}

.coupon-qr {
  position: relative;
  width: clamp(98px, 11vw, 124px);
  aspect-ratio: 1;
  border: 7px solid #ffffff;
  outline: 2px solid #2a4778;
  background:
    repeating-conic-gradient(#0f1f3f 0 25%, #ffffff 0 50%) 50% / 16px 16px;
  box-shadow: 0 8px 22px rgba(8, 19, 42, 0.26);
}

.qr-finder {
  position: absolute;
  width: 28%;
  aspect-ratio: 1;
  border: 4px solid #0f1f3f;
  background: #ffffff;
}

.qr-finder::after {
  content: "";
  position: absolute;
  inset: 25%;
  background: #0f1f3f;
}

.qr-finder.tl {
  left: 5%;
  top: 5%;
}

.qr-finder.tr {
  right: 5%;
  top: 5%;
}

.qr-finder.bl {
  left: 5%;
  bottom: 5%;
}

.coupon-qr-text {
  margin-top: 6px;
  font-size: 0.8rem;
  color: #2c4f82;
  font-weight: 700;
}

#claimButton {
  display: block;
  margin: 0 auto;
}

#letterStep {
  overflow: visible;
}

.envelope-scene {
  --paper-open-y: -84%;
  --paper-open-z: 34px;
  --paper-open-tilt: 3deg;
  position: relative;
  width: min(560px, 100%);
  margin: 0 auto;
  height: clamp(250px, 45vw, 330px);
  perspective: 1500px;
  transform-style: preserve-3d;
  overflow: visible;
  z-index: 1;
  animation: pop-in 460ms cubic-bezier(0.22, 1, 0.36, 1);
}

.envelope-paper {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 74%;
  padding: clamp(14px, 2vw, 22px);
  border-radius: 14px 14px 0 0;
  border: 1px solid rgba(235, 217, 218, 0.86);
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.94),
    rgba(246, 242, 255, 0.84)
  );
  -webkit-backdrop-filter: blur(6px) saturate(1.25);
  backdrop-filter: blur(6px) saturate(1.25);
  transform: translateY(0%) translateZ(0);
  transition: transform 920ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 920ms ease;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.24);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.envelope-paper p {
  margin: 0;
  width: 100%;
  max-height: 100%;
  overflow-y: auto;
  padding-right: 4px;
  line-height: 1.45;
  font-size: clamp(0.88rem, 0.45vw + 0.74rem, 1.02rem);
  font-weight: 700;
  color: #b14e6f;
  text-wrap: balance;
}

.envelope-paper p::-webkit-scrollbar {
  width: 6px;
}

.envelope-paper p::-webkit-scrollbar-thumb {
  background: rgba(177, 78, 111, 0.45);
  border-radius: 999px;
}

.envelope-body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 74%;
  border-radius: 0 0 20px 20px;
  background: linear-gradient(160deg, #f7efff, #e0d6f9 52%, #d4caf0);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.22);
  z-index: 3;
}

.envelope-fold {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 74%;
  background: linear-gradient(165deg, #f1e9ff, #ddd0f8);
  clip-path: polygon(0 100%, 50% 40%, 100% 100%);
  z-index: 4;
}

.envelope-flap {
  position: absolute;
  left: 0;
  right: 0;
  top: 26%;
  height: 40%;
  clip-path: polygon(0 0, 50% 100%, 100% 0);
  background: linear-gradient(165deg, #fbf3ff, #e9dbff);
  transform-origin: top;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  backface-visibility: hidden;
  z-index: 5;
}

.envelope-seal {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: clamp(46px, 8vw, 58px);
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  background: #fff4f7;
  border: 3px solid #ffc6d6;
  box-shadow: 0 4px 14px rgba(73, 23, 47, 0.25);
  z-index: 6;
  transition: transform 550ms ease, opacity 450ms ease;
}

.letter-open-btn {
  display: block;
  margin: 18px auto 0;
  position: relative;
  z-index: 2;
}

#letterStep.opened .envelope-flap {
  transform: rotateX(180deg);
  z-index: 2;
}

#letterStep.opened .envelope-paper {
  transform: translateY(var(--paper-open-y)) translateZ(var(--paper-open-z)) rotateX(var(--paper-open-tilt));
  box-shadow: 0 40px 60px rgba(0, 0, 0, 0.5);
  z-index: 10;
}

#letterStep.opened .envelope-body {
  box-shadow:
    inset 0 20px 24px rgba(77, 58, 119, 0.34),
    0 16px 32px rgba(0, 0, 0, 0.22);
}

#letterStep.opened .envelope-seal {
  transform: translate(-50%, 150%) rotate(20deg);
  opacity: 0;
  transition: all 0.5s ease-in;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pop-in {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 720px) {
  .page {
    place-items: start center;
  }

  .card {
    padding: 16px;
    border-radius: 18px;
  }

  .answer-row {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .load-track {
    height: 34px;
  }

  .wheel-shell {
    width: min(390px, 92vw);
  }

  .wheel {
    --label-distance: clamp(84px, 26vw, 140px);
  }

  .envelope-scene {
    --paper-open-y: -74%;
    --paper-open-z: 26px;
    --paper-open-tilt: 2deg;
  }
}

@media (max-width: 480px) {
  .page {
    padding:
      max(10px, env(safe-area-inset-top))
      max(10px, env(safe-area-inset-right))
      max(14px, env(safe-area-inset-bottom))
      max(10px, env(safe-area-inset-left));
  }

  .card {
    padding: 14px;
  }

  .intro-title {
    font-size: 1.52rem;
  }

  .countdown-text {
    font-size: 1rem;
  }

  .status-text,
  .question-text {
    font-size: 1rem;
  }

  .wheel-shell {
    width: 92vw;
  }

  .wheel {
    --label-distance: clamp(72px, 28vw, 106px);
  }

  .wheel-label {
    width: clamp(70px, 25vw, 92px);
  }

  .wheel-label span {
    font-size: 0.69rem;
    padding: 4px 6px;
  }

  .coupon-title {
    font-size: 1.28rem;
  }

  .coupon-card p {
    font-size: 0.95rem;
  }

  .coupon-grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: left;
  }

  .coupon-qr-wrap {
    width: auto;
    margin-top: 4px;
  }

  .envelope-scene {
    height: clamp(210px, 60vw, 260px);
    --paper-open-y: -66%;
    --paper-open-z: 20px;
    --paper-open-tilt: 1deg;
  }

  .envelope-paper {
    padding: 10px 10px 12px;
  }

  .envelope-paper p {
    font-size: 0.82rem;
    line-height: 1.34;
  }

  #letterStep.opened .envelope-paper {
    width: 95%;
    left: 2.5%;
    right: auto;
  }
}

@media (max-width: 390px) {
  .envelope-paper p {
    font-size: 0.78rem;
    line-height: 1.3;
  }
}

@media (max-height: 820px) and (max-width: 900px) {
  .page {
    place-items: start center;
    padding-top: 12px;
  }

  .card {
    padding: clamp(14px, 2.2vh, 22px);
  }

  .wheel-shell {
    width: min(380px, 78vh);
  }

  .envelope-scene {
    height: clamp(210px, 34vh, 280px);
  }
}

@media (max-height: 520px) and (max-width: 900px) and (orientation: landscape) {
  .page {
    padding: 8px 10px 12px;
  }

  .card {
    padding: 12px;
    border-radius: 14px;
  }

  .intro-title {
    font-size: 1.28rem;
  }

  .countdown-text {
    margin-top: 8px;
    font-size: 0.92rem;
  }

  .btn {
    margin-top: 10px;
    padding: 9px 12px;
    font-size: 0.92rem;
  }

  .wheel-shell {
    width: min(300px, 56vh);
  }

  .wheel-label {
    width: clamp(64px, 13vh, 96px);
  }

  .wheel-label span {
    font-size: 0.64rem;
    padding: 3px 5px;
  }

  .coupon-card {
    padding: 12px;
  }

  .coupon-title {
    font-size: 1.12rem;
    margin-top: 8px;
  }

  .coupon-card p {
    font-size: 0.9rem;
  }

  .coupon-qr {
    width: 86px;
  }

  .envelope-scene {
    height: 170px;
    --paper-open-y: -56%;
    --paper-open-z: 14px;
    --paper-open-tilt: 0deg;
  }

  .envelope-paper p {
    font-size: 0.86rem;
    line-height: 1.4;
  }
}

@media (max-width: 600px) {
  .page {
    place-items: center;
  }
}

.quiz-meta {
  margin: 6px 0 12px;
  color: rgba(255, 248, 242, 0.78);
  font-weight: 800;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.quiz-option {
  width: 100%;
  text-align: left;
  border-radius: 14px;
  padding: 12px 14px;
  font-weight: 900;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(0, 0, 0, 0.18);
  color: var(--text-main);
  transition: transform 120ms ease, filter 120ms ease, border-color 120ms ease;
}

.quiz-option:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.quiz-option.selected {
  border-color: rgba(111, 226, 255, 0.9);
  box-shadow: 0 0 0 3px rgba(111, 226, 255, 0.18);
}

.quiz-option:disabled {
  opacity: 0.78;
  cursor: not-allowed;
}