@charset "utf-8";

:root {
  --gold: #f2cf82;
  --gold-soft: #fff0bd;
  --ink: rgba(255, 250, 236, 0.93);
  --soft: rgba(255, 245, 218, 0.68);
  --dim: rgba(255, 245, 218, 0.42);
  --paper: rgba(255, 250, 236, 0.91);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 34% 14%, rgba(85, 130, 200, 0.22), transparent 34%),
    radial-gradient(circle at 78% 55%, rgba(242, 207, 130, 0.11), transparent 34%),
    linear-gradient(160deg, #020511 0%, #071326 52%, #102746 100%);
  font-family: "Noto Serif TC", "PingFang TC", "Microsoft JhengHei", serif;
  overflow-x: hidden;
}

#stars {
  position: fixed;
  inset: 0;
  z-index: -3;
  width: 100%;
  height: 100%;
}

.vignette {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background: radial-gradient(circle at center, transparent 0%, rgba(0, 0, 0, 0.16) 58%, rgba(0, 0, 0, 0.64) 100%);
  transition: background 1600ms ease;
}

body.near-end .vignette {
  background: radial-gradient(circle at center, rgba(242, 207, 130, 0.06) 0%, rgba(0, 0, 0, 0.12) 55%, rgba(0, 0, 0, 0.55) 100%);
}

.progress {
  position: fixed;
  inset: 0 auto auto 0;
  height: 2px;
  width: 0%;
  z-index: 30;
  background: linear-gradient(90deg, transparent, var(--gold), var(--gold-soft));
  box-shadow: 0 0 18px rgba(242, 207, 130, 0.42);
}

.music-button {
  position: fixed;
  top: max(14px, env(safe-area-inset-top));
  right: 14px;
  z-index: 22;
  border: 1px solid rgba(242, 207, 130, 0.30);
  border-radius: 999px;
  background: rgba(2, 5, 17, 0.52);
  backdrop-filter: blur(12px);
  color: var(--soft);
  padding: 9px 13px;
  font: 500 0.86rem/1 "PingFang TC", "Microsoft JhengHei", sans-serif;
  cursor: pointer;
}

.cover {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(2, 5, 17, 0.66);
  backdrop-filter: blur(10px);
  transition: opacity 900ms ease, visibility 900ms ease;
}

.cover.hide {
  opacity: 0;
  visibility: hidden;
}

.cover-inner {
  width: min(680px, 92vw);
  min-height: min(540px, 74vh);
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px solid rgba(242, 207, 130, 0.23);
  border-radius: 30px;
  background:
    radial-gradient(circle at 50% 36%, rgba(242, 207, 130, 0.065), transparent 43%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.080), rgba(255, 255, 255, 0.032));
  box-shadow: 0 30px 95px rgba(0, 0, 0, 0.42);
  padding: 38px 22px;
}

.kicker {
  color: var(--dim);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font: 600 0.72rem/1.6 "PingFang TC", "Microsoft JhengHei", sans-serif;
}

h1 {
  margin: 18px 0 22px;
  color: var(--gold);
  font-size: clamp(2.35rem, 8vw, 4.8rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: 0.05em;
  text-shadow: 0 0 36px rgba(242, 207, 130, 0.22);
}

.cover p {
  color: var(--soft);
  line-height: 2;
  letter-spacing: 0.06em;
  margin: 0 auto 28px;
  max-width: 520px;
}

button {
  border: 1px solid rgba(242, 207, 130, 0.44);
  border-radius: 999px;
  background: rgba(242, 207, 130, 0.10);
  color: var(--ink);
  padding: 13px 26px;
  letter-spacing: 0.12em;
  cursor: pointer;
  font-family: "PingFang TC", "Microsoft JhengHei", sans-serif;
  -webkit-tap-highlight-color: transparent;
}

.hint {
  margin-top: 14px;
  color: rgba(255, 245, 218, 0.42);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

main {
  width: min(720px, calc(100vw - 34px));
  margin: 0 auto;
  padding: 108px 0 90px;
}

.hero {
  min-height: 72vh;
  display: grid;
  align-content: center;
  text-align: center;
}

.hero h2 {
  margin: 14px 0;
  color: var(--gold);
  font-size: clamp(2.1rem, 8vw, 4.1rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: 0.055em;
  text-shadow: 0 0 34px rgba(242, 207, 130, 0.18);
}

.lead {
  max-width: 620px;
  margin: 0 auto;
  color: var(--soft);
  line-height: 2.05;
  letter-spacing: 0.05em;
  font-size: clamp(1.03rem, 3vw, 1.15rem);
}

.letter {
  padding: 24px 0 40px;
}

.letter p {
  margin: 0 0 1.42em;
  color: var(--paper);
  font-size: clamp(1.08rem, 3.55vw, 1.25rem);
  line-height: 1.98;
  letter-spacing: 0.045em;
  text-align: left;
}

.letter p:nth-child(1),
.letter p:nth-child(4),
.letter p:nth-child(12),
.letter p:nth-child(21),
.letter p:nth-child(24) {
  margin-top: 2.2em;
}

.letter p:nth-child(1) {
  font-size: clamp(1.2rem, 4vw, 1.42rem);
  color: rgba(255, 250, 236, 0.97);
}

.letter p:nth-child(18),
.letter p:nth-child(19),
.letter p:nth-child(24),
.letter p:nth-child(25) {
  color: rgba(255, 250, 236, 0.96);
}

.signature-section {
  min-height: 82vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 92px 0 42px;
}

.sig-line {
  width: 92px;
  height: 1px;
  margin: 0 auto 28px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  box-shadow: 0 0 22px rgba(242, 207, 130, 0.38);
}

.signature-section h2 {
  margin: 0 0 24px;
  color: var(--gold);
  font-size: clamp(2.4rem, 9vw, 5rem);
  font-weight: 500;
  text-shadow: 0 0 34px rgba(242, 207, 130, 0.20);
}

.with {
  color: var(--dim);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font: 600 0.82rem/1.6 "PingFang TC", "Microsoft JhengHei", sans-serif;
  margin-bottom: 12px;
}

.name {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--gold);
  font-size: clamp(3rem, 13vw, 6rem);
  font-style: italic;
  text-shadow: 0 0 30px rgba(242, 207, 130, 0.25);
}

.memory {
  margin: 60px auto 0;
  color: var(--soft);
  line-height: 2;
  letter-spacing: 0.08em;
  font-size: clamp(1.05rem, 3.5vw, 1.25rem);
}

.credit {
  margin-top: 24px;
  color: rgba(255, 245, 218, 0.36);
  font: 400 0.72rem/1.6 "PingFang TC", "Microsoft JhengHei", sans-serif;
  letter-spacing: 0.06em;
}

@media (max-width: 560px) {
  main {
    width: min(100vw - 34px, 720px);
    padding-top: 88px;
  }

  .cover-inner {
    border-radius: 26px;
  }

  .hero {
    min-height: 66vh;
  }

  .letter p {
    line-height: 1.86;
    margin-bottom: 1.34em;
  }
}

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

  .cover,
  .vignette {
    transition: none;
  }
}