:root {
  --ink: #12344c;
  --ink-soft: #3f617a;
  --blue: #0f65a9;
  --blue-deep: #083f78;
  --gold: #c99a3f;
  --paper: rgba(255, 255, 255, 0.88);
  --paper-strong: rgba(255, 255, 255, 0.96);
  --shadow: 0 1.25rem 3.5rem rgba(7, 44, 76, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #edf6fc;
  color: var(--ink);
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
}

button {
  font: inherit;
}

.motion-canvas {
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  opacity: 0.72;
  mix-blend-mode: soft-light;
}

.splash {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 1.2rem;
  background:
    radial-gradient(circle at 50% 36%, rgba(255, 255, 255, 0.84), rgba(240, 248, 255, 0.72) 34%, rgba(4, 48, 92, 0.28) 100%),
    url("./assets/page-1.png") center / cover;
  transition: opacity 0.68s ease, transform 0.68s ease, visibility 0.68s ease;
}

.splash::before {
  content: "";
  position: absolute;
  inset: -18%;
  background:
    conic-gradient(from 120deg, transparent, rgba(201, 154, 63, 0.24), transparent 26%, rgba(15, 101, 169, 0.22), transparent 52%);
  animation: slow-rotate 18s linear infinite;
}

.splash-card {
  position: relative;
  width: min(100%, 22rem);
  padding: 2.1rem 1.55rem 1.8rem;
  border-radius: 0.58rem;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-top: 0.18rem solid rgba(201, 154, 63, 0.92);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 1.8rem 5rem rgba(7, 44, 76, 0.24);
  text-align: center;
  backdrop-filter: blur(0.82rem);
  animation: card-rise 0.9s ease both;
}

.splash-kicker,
.splash-card h2 {
  margin: 0;
}

.splash-kicker {
  color: var(--blue-deep);
  font: 600 0.82rem/1.5 "PingFang SC", "Microsoft YaHei", sans-serif;
}

.splash-card h2 {
  margin-top: 0.9rem;
  color: var(--blue-deep);
  font-size: 1.92rem;
  line-height: 1.18;
}

.start-button {
  margin-top: 1.45rem;
  min-height: 2.7rem;
  padding: 0 1.35rem;
  border: 0;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-deep), var(--blue) 58%, #d1a552);
  box-shadow: 0 0.75rem 1.8rem rgba(8, 63, 120, 0.22);
  cursor: pointer;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
}

.splash.is-hidden {
  opacity: 0;
  visibility: hidden;
  transform: scale(1.04);
  pointer-events: none;
}

.has-started .page.is-active .eyebrow,
.has-started .page.is-active .tag,
.has-started .page.is-active .page-title span,
.has-started .page.is-active .panel-body p {
  animation: text-lift 0.78s cubic-bezier(0.2, 0.75, 0.25, 1) both;
}

.has-started .page.is-active .tag {
  animation-delay: 0.08s;
}

.has-started .page.is-active .page-title span:first-child {
  animation-delay: 0.16s;
}

.has-started .page.is-active .page-title span:last-child {
  animation-delay: 0.26s;
}

.has-started .page.is-active .panel-body p:nth-child(1) {
  animation-delay: 0.38s;
}

.has-started .page.is-active .panel-body p:nth-child(2) {
  animation-delay: 0.48s;
}

.has-started .page.is-active .panel-body p:nth-child(3) {
  animation-delay: 0.58s;
}

.has-started .page.is-active .panel-body p:nth-child(4) {
  animation-delay: 0.68s;
}

.invitation {
  width: 100%;
  height: 100svh;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  background: #edf6fc;
}

.page {
  position: relative;
  min-height: 100svh;
  isolation: isolate;
  display: grid;
  align-items: center;
  padding: max(1.4rem, env(safe-area-inset-top)) 1.15rem max(2.35rem, env(safe-area-inset-bottom));
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow: hidden;
}

.page-bg,
.page-shade {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate3d(0, var(--parallax-y, 0), 0) scale(1);
  transition: transform 1.4s ease, filter 1.4s ease;
}

.page-shade {
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(244, 250, 255, 0.1) 0%, rgba(244, 250, 255, 0.62) 42%, rgba(244, 250, 255, 0.9) 100%),
    radial-gradient(circle at 50% 48%, rgba(255, 255, 255, 0.68), rgba(255, 255, 255, 0.1) 42%, rgba(8, 63, 120, 0.12) 100%);
}

.page-fx {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.orb {
  position: absolute;
  display: block;
  border-radius: 999px;
  filter: blur(0.25rem);
  opacity: 0;
  transform: translate3d(0, 0, 0) scale(0.8);
}

.orb-a {
  width: 8.5rem;
  height: 8.5rem;
  right: -2rem;
  top: 11%;
  background: radial-gradient(circle, rgba(201, 154, 63, 0.24), rgba(201, 154, 63, 0));
}

.orb-b {
  width: 12rem;
  height: 12rem;
  left: -5rem;
  bottom: 10%;
  background: radial-gradient(circle, rgba(15, 101, 169, 0.22), rgba(15, 101, 169, 0));
}

.light-streak {
  position: absolute;
  left: -40%;
  top: 0;
  width: 36%;
  height: 100%;
  background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  opacity: 0;
  transform: skewX(-16deg);
}

.wave {
  position: absolute;
  display: block;
  width: 82%;
  height: 9rem;
  border: 1px solid rgba(201, 154, 63, 0.24);
  border-left: 0;
  border-right: 0;
  border-radius: 50%;
  opacity: 0;
}

.wave-a {
  right: -18%;
  top: 15%;
  --wave-rotate: -18deg;
  transform: rotate(-18deg);
}

.wave-b {
  left: -30%;
  bottom: 13%;
  --wave-rotate: 16deg;
  border-color: rgba(15, 101, 169, 0.2);
  transform: rotate(16deg);
}

.copy-panel {
  width: min(100%, 24.5rem);
  margin: 0 auto;
  padding: 1.65rem 1.45rem 1.55rem;
  background:
    linear-gradient(180deg, var(--paper-strong), var(--paper)),
    linear-gradient(135deg, rgba(201, 154, 63, 0.32), rgba(15, 101, 169, 0.22));
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-top: 0.18rem solid rgba(201, 154, 63, 0.9);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(0.7rem);
  opacity: 0;
  transform: translateY(1.15rem);
  transition: opacity 0.72s ease, transform 0.72s ease;
}

.copy-panel::before,
.copy-panel::after {
  content: "";
  display: block;
  width: 3.2rem;
  height: 1px;
  margin: 0 auto 0.82rem;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.copy-panel::after {
  width: 5.8rem;
  margin: 1rem auto 0;
  opacity: 0.72;
}

.eyebrow,
.tag,
.page-title,
.panel-body p {
  margin: 0;
}

.eyebrow {
  color: var(--blue-deep);
  font-size: 0.76rem;
  line-height: 1.45;
  letter-spacing: 0;
  text-align: center;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
}

.tag {
  width: fit-content;
  margin: 0.88rem auto 0;
  padding: 0.24rem 0.72rem;
  border: 1px solid rgba(201, 154, 63, 0.58);
  color: var(--gold);
  background: rgba(255, 252, 244, 0.76);
  border-radius: 999px;
  font-size: 0.74rem;
  line-height: 1.25;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
}

.page-title {
  margin-top: 0.9rem;
  color: var(--blue-deep);
  font-size: 2.02rem;
  line-height: 1.08;
  text-align: center;
  font-weight: 700;
}

.page-title span {
  display: block;
}

.panel-body {
  margin-top: 1.2rem;
}

.panel-body p + p {
  margin-top: 0.84rem;
}

.salutation,
.copy,
.contact,
.date {
  white-space: pre-wrap;
}

.salutation {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.8;
}

.copy {
  color: var(--ink);
  font-size: 0.96rem;
  line-height: 1.82;
  text-align: justify;
}

.contact {
  color: var(--blue-deep);
  font-size: 0.95rem;
  line-height: 1.65;
  font-weight: 600;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.date {
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.65;
  text-align: right;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.page[data-page-id="cover"] {
  align-items: end;
}

.page[data-page-id="cover"] .copy-panel {
  margin-bottom: 6.8svh;
}

.page[data-page-id="cover"] .page-title {
  font-size: 2.16rem;
}

.page[data-page-id="project"] {
  align-items: start;
  padding-top: max(3rem, env(safe-area-inset-top));
}

.page[data-page-id="project"] .copy-panel {
  margin-top: 4.2svh;
}

.page[data-page-id="project"] .page-title,
.page[data-page-id="details"] .page-title {
  font-size: 1.86rem;
}

.page[data-page-id="details"] {
  align-items: start;
  padding-top: max(3.2rem, env(safe-area-inset-top));
}

.page[data-page-id="details"] .copy-panel {
  margin-top: 5.8svh;
}

.page.is-active .page-bg img {
  transform: translate3d(0, var(--parallax-y, 0), 0) scale(1.052);
  filter: saturate(1.04);
}

.page.is-active .copy-panel {
  opacity: 1;
  transform: translateY(var(--panel-drift, 0));
}

.page.is-active .orb-a {
  animation: float-orb-a 6s ease-in-out infinite;
  opacity: 1;
}

.page.is-active .orb-b {
  animation: float-orb-b 7.4s ease-in-out infinite;
  opacity: 1;
}

.page.is-active .light-streak {
  animation: light-sweep 4.8s ease-in-out infinite;
}

.page.is-active .wave-a {
  animation: wave-flow 7s ease-in-out infinite;
  opacity: 1;
}

.page.is-active .wave-b {
  animation: wave-flow 8.2s ease-in-out 0.8s infinite reverse;
  opacity: 1;
}

.page-dots {
  position: fixed;
  top: 50%;
  right: max(0.55rem, env(safe-area-inset-right));
  z-index: 10;
  display: grid;
  gap: 0.5rem;
  transform: translateY(-50%);
}

.dot {
  width: 0.46rem;
  height: 0.46rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(8, 63, 120, 0.25);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.75);
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease;
}

.dot.is-active {
  background: var(--gold);
  transform: scale(1.36);
}

.music-toggle {
  position: fixed;
  right: max(0.78rem, env(safe-area-inset-right));
  top: max(0.72rem, env(safe-area-inset-top));
  z-index: 12;
  display: grid;
  place-items: center;
  width: 2.65rem;
  height: 2.65rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: 999px;
  color: var(--blue-deep);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0.75rem 1.8rem rgba(7, 44, 76, 0.14);
  cursor: pointer;
  backdrop-filter: blur(0.55rem);
}

.music-note {
  font-size: 1.18rem;
  line-height: 1;
}

.music-toggle.is-playing {
  color: #fff;
  background: linear-gradient(135deg, var(--blue-deep), var(--gold));
}

.music-toggle.is-playing .music-note {
  animation: music-pulse 1.05s ease-in-out infinite;
}

.next-cue {
  position: fixed;
  left: 50%;
  bottom: max(1.05rem, env(safe-area-inset-bottom));
  z-index: 11;
  width: 2.55rem;
  height: 2.55rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 0.8rem 2.1rem rgba(7, 44, 76, 0.16);
  transform: translateX(-50%);
  cursor: pointer;
  backdrop-filter: blur(0.55rem);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

.next-cue span {
  position: absolute;
  left: 50%;
  top: 45%;
  width: 0.72rem;
  height: 0.72rem;
  border-right: 2px solid var(--blue-deep);
  border-bottom: 2px solid var(--blue-deep);
  transform: translate(-50%, -50%) rotate(45deg);
  animation: cue 1.45s ease-in-out infinite;
}

.next-cue.is-hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(0.8rem);
}

@keyframes cue {
  0%,
  100% {
    opacity: 0.35;
    margin-top: -0.16rem;
  }
  50% {
    opacity: 1;
    margin-top: 0.2rem;
  }
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(1.4rem) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes slow-rotate {
  to {
    transform: rotate(360deg);
  }
}

@keyframes text-lift {
  from {
    opacity: 0;
    transform: translateY(0.86rem);
    filter: blur(0.12rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes float-orb-a {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(0.94);
  }
  50% {
    transform: translate3d(-1.1rem, 1.4rem, 0) scale(1.08);
  }
}

@keyframes float-orb-b {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(1.4rem, -1rem, 0) scale(0.9);
  }
}

@keyframes light-sweep {
  0% {
    left: -42%;
    opacity: 0;
  }
  18%,
  44% {
    opacity: 0.55;
  }
  72%,
  100% {
    left: 106%;
    opacity: 0;
  }
}

@keyframes wave-flow {
  0%,
  100% {
    opacity: 0.1;
    transform: translateY(0) rotate(var(--wave-rotate, -18deg)) scaleX(0.96);
  }
  50% {
    opacity: 0.48;
    transform: translateY(0.9rem) rotate(var(--wave-rotate, -18deg)) scaleX(1.06);
  }
}

@keyframes music-pulse {
  0%,
  100% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.16) rotate(8deg);
  }
}

@media (max-height: 740px) {
  .copy-panel {
    padding: 1.15rem 1.12rem 1.1rem;
  }

  .page-title {
    font-size: 1.72rem;
  }

  .page[data-page-id="cover"] .page-title {
    font-size: 1.86rem;
  }

  .page[data-page-id="project"] .page-title,
  .page[data-page-id="details"] .page-title {
    font-size: 1.58rem;
  }

  .panel-body {
    margin-top: 0.82rem;
  }

  .copy {
    font-size: 0.86rem;
    line-height: 1.66;
  }
}

@media (min-width: 720px) {
  body {
    display: grid;
    place-items: center;
    background:
      linear-gradient(135deg, #e9f3fb, #fff8e9 55%, #e7f4fb);
  }

  .invitation {
    width: min(100vw, 30rem);
    height: min(100svh, 53.35rem);
    border-radius: 0.75rem;
    box-shadow: 0 2rem 5rem rgba(7, 44, 76, 0.18);
  }

  .page-dots {
    right: calc(50% - min(50vw, 15rem) + 0.75rem);
  }

  .next-cue {
    bottom: calc(50% - min(50svh, 26.675rem) + 1.15rem);
  }

  .music-toggle {
    right: calc(50% - min(50vw, 15rem) + 0.72rem);
    top: calc(50% - min(50svh, 26.675rem) + 0.72rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .invitation {
    scroll-behavior: auto;
  }

  .page-bg img,
  .copy-panel,
  .splash,
  .splash::before,
  .splash-card,
  .orb,
  .light-streak,
  .wave,
  .dot,
  .next-cue,
  .next-cue span,
  .music-toggle .music-note {
    animation: none;
    transition: none;
  }
}