:root {
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --ice-100: #eef4ff;
  --ice-300: #bcccec;
  --ice-500: #8fa5cb;
  --warm-1: #ffe29a;
  --warm-2: #ff9a4d;
  --warm-3: #ff5f6d;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ice-100);
  background: #060a17;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.landing {
  overflow: hidden;
}

/* ---------- Background scene ---------- */

.sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1100px 760px at 18% -6%, rgba(64, 110, 255, 0.28), transparent 62%),
    radial-gradient(900px 620px at 88% 4%, rgba(150, 80, 255, 0.22), transparent 62%),
    radial-gradient(760px 520px at 50% 104%, rgba(0, 200, 255, 0.14), transparent 64%),
    linear-gradient(180deg, #050813 0%, #0a1230 46%, #0e1938 100%);
}

.sky::before,
.sky::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: aurora 20s ease-in-out infinite alternate;
}

.sky::before {
  width: 46vw;
  height: 46vw;
  min-width: 320px;
  min-height: 320px;
  left: -12vw;
  top: -8vw;
  background: radial-gradient(circle, rgba(70, 140, 255, 0.5), transparent 68%);
}

.sky::after {
  width: 40vw;
  height: 40vw;
  min-width: 280px;
  min-height: 280px;
  right: -10vw;
  top: 8vh;
  background: radial-gradient(circle, rgba(168, 92, 255, 0.42), transparent 68%);
  animation-delay: -9s;
}

#snow {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hills {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  pointer-events: none;
  line-height: 0;
}

.hills svg {
  display: block;
  width: 100%;
  height: min(36vh, 330px);
}

@keyframes aurora {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.42;
  }
  100% {
    transform: translate3d(5vw, 4vh, 0) scale(1.12);
    opacity: 0.62;
  }
}

/* ---------- Landing ---------- */

.page {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 28px 22px calc(28px + var(--safe-bottom));
}

.card {
  position: relative;
  width: min(560px, 100%);
  padding: clamp(30px, 5.2vw, 46px) clamp(24px, 5.2vw, 46px) clamp(24px, 4vw, 34px);
  text-align: center;
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.03) 46%, rgba(120, 160, 255, 0.07)),
    rgba(10, 16, 38, 0.5);
  box-shadow:
    0 46px 100px -34px rgba(0, 0, 0, 0.9),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  animation: card-in 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(140% 90% at 50% -18%, rgba(255, 255, 255, 0.16), transparent 56%);
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(26px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.gift-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 128px;
  height: 118px;
  margin-bottom: 6px;
  animation: float 6.5s ease-in-out infinite;
}

.gift-glow {
  position: absolute;
  width: 118px;
  height: 118px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 154, 77, 0.5), rgba(255, 95, 109, 0.16) 48%, transparent 70%);
  filter: blur(10px);
  animation: glow 4.5s ease-in-out infinite;
}

.gift {
  position: relative;
  width: 112px;
  height: 112px;
  filter: drop-shadow(0 14px 26px rgba(255, 95, 109, 0.35));
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(-1.6deg);
  }
  50% {
    transform: translateY(-9px) rotate(1.6deg);
  }
}

@keyframes glow {
  0%,
  100% {
    opacity: 0.65;
    transform: scale(0.94);
  }
  50% {
    opacity: 1;
    transform: scale(1.06);
  }
}

.eyebrow {
  margin: 8px 0 10px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--ice-500);
}

h1 {
  margin: 0;
  font-size: clamp(25px, 5.4vw, 37px);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.02em;
  color: #f4f8ff;
  text-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--warm-1) 0%, var(--warm-2) 52%, #ff8fa3 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.question {
  margin: 16px 0 0;
  font-size: clamp(14px, 3.4vw, 16px);
  color: var(--ice-300);
  letter-spacing: 0.16em;
  text-indent: 0.16em;
}

.actions {
  display: flex;
  gap: 14px;
  margin-top: clamp(22px, 4.6vw, 30px);
}

.btn {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: inherit;
  font-size: clamp(15px, 4vw, 17px);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  -webkit-tap-highlight-color: transparent;
  transition:
    transform 0.18s ease,
    box-shadow 0.24s ease,
    background-color 0.24s ease,
    border-color 0.24s ease,
    color 0.24s ease;
}

.btn:active {
  transform: translateY(1px) scale(0.985);
}

.btn:focus-visible {
  outline: 2px solid rgba(255, 226, 154, 0.9);
  outline-offset: 3px;
}

.btn-refuse {
  color: #9aa7bd;
  background: rgba(148, 163, 184, 0.09);
  border-color: rgba(148, 163, 184, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.btn-refuse:hover {
  color: #c3cede;
  background: rgba(148, 163, 184, 0.16);
  border-color: rgba(180, 195, 215, 0.4);
}

.btn-accept {
  color: #3a1503;
  background: linear-gradient(118deg, #ffe29a 0%, #ffab52 42%, #ff7b4d 72%, #ff5f6d 100%);
  border-color: rgba(255, 226, 154, 0.55);
  box-shadow:
    0 14px 34px -8px rgba(255, 122, 77, 0.62),
    0 0 34px rgba(255, 154, 77, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.btn-accept:hover {
  transform: translateY(-2px);
  box-shadow:
    0 20px 44px -10px rgba(255, 122, 77, 0.78),
    0 0 46px rgba(255, 154, 77, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.btn-accept::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 22%, rgba(255, 255, 255, 0.6) 48%, transparent 74%);
  transform: translateX(-140%);
  animation: shine 3.8s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shine {
  0%,
  58% {
    transform: translateX(-140%);
  }
  82%,
  100% {
    transform: translateX(140%);
  }
}

.footnote {
  margin: 22px 0 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  color: rgba(143, 165, 203, 0.72);
}

/* ---------- Play page ---------- */

.play-page {
  overflow: hidden;
  height: 100vh;
  height: 100svh;
}

.play-wrap {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  padding: calc(16px + var(--safe-top)) clamp(16px, 4vw, 32px) calc(18px + var(--safe-bottom));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 4px 2px;
  font-size: 13px;
}

.back {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  color: var(--ice-300);
  text-decoration: none;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition:
    color 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease;
}

.back:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.26);
}

.brand {
  font-weight: 600;
  letter-spacing: 0.24em;
  text-indent: 0.24em;
  color: rgba(238, 244, 255, 0.86);
}

.topbar-spacer {
  width: 86px;
}

.stage {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: clamp(10px, 2vh, 22px) 0;
}

.video-frame {
  position: relative;
  width: -webkit-fit-content;
  width: fit-content;
  max-width: min(92vw, 460px);
  border-radius: 26px;
  overflow: hidden;
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow:
    0 44px 96px -30px rgba(0, 0, 0, 0.9),
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 0 90px rgba(90, 140, 255, 0.2);
  animation: video-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.video-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.video-frame video {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(100vh - 220px);
  max-height: calc(100svh - 220px);
  aspect-ratio: 576 / 700;
  background: #000;
  object-fit: contain;
}

@keyframes video-in {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.sound-hint {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255, 226, 154, 0.4);
  background: linear-gradient(120deg, rgba(255, 226, 154, 0.16), rgba(255, 122, 77, 0.16));
  color: #ffe6b3;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition:
    opacity 0.3s ease,
    transform 0.3s ease,
    visibility 0.3s ease,
    background-color 0.2s ease;
}

.sound-hint.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  animation: hint-pulse 2.4s ease-in-out infinite;
}

.sound-hint:hover {
  background: rgba(255, 200, 120, 0.24);
}

.sound-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ffcf6b;
  box-shadow: 0 0 0 0 rgba(255, 207, 107, 0.7);
  animation: dot 1.8s ease-out infinite;
}

@keyframes dot {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 207, 107, 0.65);
  }
  70% {
    box-shadow: 0 0 0 9px rgba(255, 207, 107, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 207, 107, 0);
  }
}

@keyframes hint-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(255, 200, 120, 0.28);
  }
  50% {
    box-shadow: 0 0 22px 2px rgba(255, 200, 120, 0.28);
  }
}

.play-foot {
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-indent: 0.16em;
  color: rgba(143, 165, 203, 0.66);
}

/* ---------- Small screens ---------- */

@media (max-width: 420px) {
  .page {
    padding: 18px 14px calc(20px + var(--safe-bottom));
  }

  .card {
    border-radius: 26px;
  }

  .actions {
    gap: 10px;
  }

  .btn {
    padding: 15px 8px;
    letter-spacing: 0.03em;
  }

  .gift-wrap {
    width: 112px;
    height: 104px;
  }

  .gift {
    width: 98px;
    height: 98px;
  }

  .topbar-spacer {
    width: 70px;
  }

  .brand {
    font-size: 12px;
  }

  .back {
    padding: 7px 11px;
    font-size: 12px;
  }
}

/* 矮屏：压缩落地页间距 */
@media (max-height: 620px) {
  .page {
    padding: 12px 16px;
  }

  .card {
    padding: 20px 26px 18px;
    border-radius: 24px;
  }

  .gift-wrap {
    width: 86px;
    height: 78px;
    margin-bottom: 0;
  }

  .gift {
    width: 76px;
    height: 76px;
  }

  .eyebrow {
    margin: 4px 0 6px;
  }

  h1 {
    font-size: clamp(20px, 4.4vw, 28px);
    line-height: 1.3;
  }

  .question {
    margin-top: 10px;
  }

  .actions {
    margin-top: 16px;
  }

  .btn {
    padding: 12px 10px;
  }

  .footnote {
    display: none;
  }
}

/* 极矮横屏：视频与声音提示并排，优先保证完整可见 */
@media (max-height: 560px) and (orientation: landscape) {
  .video-frame {
    width: auto;
    max-width: none;
    height: min(68svh, 420px);
    aspect-ratio: 576 / 700;
  }

  .video-frame video {
    height: 100%;
    width: auto;
    max-width: none;
    max-height: none;
  }

  .stage {
    flex-direction: row;
    gap: 22px;
    padding: 8px 0;
  }

  .play-foot {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}