/* 520 特辑 — Captain → Crystal */

:root {
  --520-rose: #e85d8a;
  --520-rose-deep: #c93d6b;
  --520-blush: #ffe4ef;
  --520-gold: #f0b87a;
  --520-ink: #4a2a38;
  --520-ink-soft: #6b4555;
  --520-glass: rgba(255, 255, 255, 0.72);
  --520-font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --520-font-sans: "Noto Sans SC", system-ui, sans-serif;
  --520-font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.page-520 {
  margin: 0;
  min-height: 100vh;
  font-family: var(--520-font-sans);
  color: var(--520-ink);
  background: #1a0a12;
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(232, 93, 138, 0.45) 0%, transparent 55%),
    radial-gradient(ellipse 80% 60% at 0% 50%, rgba(240, 184, 122, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 70% 50% at 100% 80%, rgba(201, 61, 107, 0.25) 0%, transparent 50%),
    linear-gradient(165deg, #2d1520 0%, #1a0a12 40%, #120810 100%);
  line-height: 1.75;
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: #fff;
  color: var(--520-ink);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mono {
  font-family: var(--520-font-mono);
}

.hearts-canvas,
.digits-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.digits-canvas {
  z-index: 1;
  opacity: 0.35;
}

.petals-520 {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  overflow: hidden;
}

.petal-520 {
  position: absolute;
  top: -24px;
  left: var(--x);
  width: 14px;
  height: 18px;
  margin-left: -7px;
  background: linear-gradient(155deg, rgba(255, 200, 220, 0.95), rgba(232, 93, 138, 0.5));
  border-radius: 55% 45% 60% 40% / 60% 55% 45% 40%;
  opacity: 0.7;
  animation: petal-520-fall var(--fall, 20s) linear var(--delay, 0s) infinite;
}

@keyframes petal-520-fall {
  0% {
    transform: translate3d(0, -10vh, 0) rotate(0deg);
    opacity: 0;
  }
  8% {
    opacity: 0.75;
  }
  100% {
    transform: translate3d(var(--drift, 30px), 110vh, 0) rotate(480deg);
    opacity: 0;
  }
}

.main-520 {
  position: relative;
  z-index: 10;
  max-width: 52rem;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4rem) clamp(1.25rem, 4vw, 2rem) 3rem;
  text-align: center;
}

/* Hero */
.hero-520__tag {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--520-blush);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 182, 210, 0.25);
  border-radius: 999px;
}

.hero-520__title {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: clamp(0.15rem, 2vw, 0.5rem);
  margin: 0 0 0.5rem;
  font-family: var(--520-font-display);
  font-weight: 400;
  line-height: 1;
}

.hero-520__digit {
  display: inline-block;
  font-size: clamp(4.5rem, 22vw, 9rem);
  color: transparent;
  background: linear-gradient(180deg, #fff5f8 0%, var(--520-rose) 45%, var(--520-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 40px rgba(232, 93, 138, 0.55));
  animation: digit-pulse 2.4s ease-in-out infinite;
}

.hero-520__digit:nth-child(2) {
  animation-delay: 0.25s;
}

.hero-520__digit:nth-child(3) {
  animation-delay: 0.5s;
}

@keyframes digit-pulse {
  0%,
  100% {
    transform: scale(1) translateY(0);
  }
  50% {
    transform: scale(1.04) translateY(-4px);
  }
}

.hero-520__sub {
  margin: 0 0 1.25rem;
  font-size: clamp(1.1rem, 3.5vw, 1.45rem);
  color: var(--520-blush);
  letter-spacing: 0.2em;
}

.hero-520__lead {
  margin: 0 auto;
  max-width: 28rem;
  font-size: 1.05rem;
  color: rgba(255, 228, 239, 0.92);
}

.hero-520__lead strong {
  color: #fff;
  font-weight: 600;
}

/* Couple */
.couple-520 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.75rem, 4vw, 2rem);
  margin: 2.5rem 0 1rem;
  position: relative;
}

.couple-520__glow {
  position: absolute;
  width: min(320px, 80vw);
  height: 120px;
  background: radial-gradient(ellipse, rgba(232, 93, 138, 0.35) 0%, transparent 70%);
  pointer-events: none;
}

.couple-520__face {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--520-blush);
  transition: transform 0.35s ease;
}

.couple-520__face:hover {
  transform: translateY(-4px) scale(1.03);
}

.couple-520__face img {
  width: clamp(72px, 18vw, 96px);
  height: clamp(72px, 18vw, 96px);
  border-radius: 50%;
  border: 3px solid rgba(255, 182, 210, 0.6);
  box-shadow:
    0 0 0 4px rgba(232, 93, 138, 0.2),
    0 12px 32px rgba(0, 0, 0, 0.35);
  object-fit: cover;
}

.couple-520__name {
  font-size: 0.95rem;
  font-weight: 500;
}

.couple-520__heart-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.couple-520__heart {
  color: var(--520-rose);
  text-shadow: 0 0 20px rgba(232, 93, 138, 0.8);
  line-height: 1;
}

.couple-520__heart--1 {
  font-size: 1.5rem;
  animation: heart-beat 1.2s ease-in-out infinite;
}

.couple-520__heart--2 {
  font-size: 2.25rem;
  animation: heart-beat 1.2s ease-in-out 0.15s infinite;
}

.couple-520__heart--3 {
  font-size: 1.25rem;
  animation: heart-beat 1.2s ease-in-out 0.3s infinite;
}

@keyframes heart-beat {
  0%,
  100% {
    transform: scale(1);
  }
  25% {
    transform: scale(1.15);
  }
  40% {
    transform: scale(1);
  }
  60% {
    transform: scale(1.1);
  }
}

.together-520 {
  margin: 0.5rem 0 0.25rem;
  font-size: clamp(0.85rem, 2.5vw, 1rem);
  color: var(--520-gold);
}

.together-520__since {
  margin: 0 0 2.5rem;
  font-size: 0.9rem;
  color: rgba(255, 228, 239, 0.65);
}

/* Decode */
.decode-520,
.letters-520 {
  text-align: left;
  margin-bottom: 2.5rem;
}

.decode-520__title,
.letters-520__title {
  font-family: var(--520-font-display);
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  font-weight: 400;
  color: #fff5f8;
  text-align: center;
  margin: 0 0 1.25rem;
}

.decode-520__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.decode-520__list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.15rem;
  background: var(--520-glass);
  backdrop-filter: blur(12px);
  border-radius: 14px;
  border: 1px solid rgba(255, 182, 210, 0.2);
  color: var(--520-ink-soft);
  font-size: 0.98rem;
}

.decode-520__num {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--520-rose), var(--520-rose-deep));
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(232, 93, 138, 0.35);
}

/* Letters */
.letters-520__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.letter-card {
  position: relative;
  padding: 1.25rem 1.15rem 1.15rem;
  background: var(--520-glass);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  border: 1px solid rgba(255, 182, 210, 0.22);
  color: var(--520-ink);
  font-size: 0.95rem;
  text-align: left;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.letter-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(232, 93, 138, 0.2);
}

.letter-card--wide {
  grid-column: 1 / -1;
}

.letter-card__icon {
  display: block;
  font-size: 1.35rem;
  color: var(--520-rose);
  margin-bottom: 0.5rem;
}

.letter-card__math {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--520-rose-deep);
}

.letter-card p {
  margin: 0;
}

/* Promise / letter */
.promise-520 {
  margin: 2rem 0;
}

.promise-520__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--520-font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--520-rose) 0%, var(--520-rose-deep) 100%);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow:
    0 8px 28px rgba(232, 93, 138, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.promise-520__btn:hover {
  transform: scale(1.04);
  box-shadow: 0 12px 36px rgba(232, 93, 138, 0.55);
}

.promise-520__btn-heart {
  animation: heart-beat 1.2s ease-in-out infinite;
}

.promise-520__letter {
  margin: 1.5rem auto 0;
  max-width: 26rem;
  padding: 1.5rem 1.35rem;
  text-align: left;
  background: rgba(255, 245, 248, 0.95);
  border-radius: 12px;
  border: 2px dashed rgba(232, 93, 138, 0.4);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  animation: letter-reveal 0.6s ease-out;
}

.promise-520__letter[hidden] {
  display: none;
}

@keyframes letter-reveal {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.promise-520__dear {
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--520-rose-deep);
}

.promise-520__letter p {
  margin: 0 0 0.75rem;
  color: var(--520-ink-soft);
  font-size: 0.98rem;
}

.promise-520__sign {
  margin: 0.5rem 0 0 !important;
  text-align: right;
  font-style: italic;
  color: var(--520-rose-deep) !important;
}

.hint-520 {
  margin: 1.5rem 0;
  font-size: 0.85rem;
  color: rgba(255, 228, 239, 0.5);
}

.nav-520 {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.nav-520__link {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: var(--520-blush);
  text-decoration: none;
  border: 1px solid rgba(255, 182, 210, 0.3);
  border-radius: 999px;
  transition: background 0.25s ease, color 0.25s ease;
}

.nav-520__link:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.footer-520 {
  position: relative;
  z-index: 10;
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255, 228, 239, 0.45);
}

/* Click hearts */
.click-heart {
  position: fixed;
  pointer-events: none;
  z-index: 50;
  font-size: var(--sz, 1.5rem);
  color: var(--520-rose);
  text-shadow: 0 0 12px rgba(232, 93, 138, 0.9);
  animation: click-heart-rise 1.2s ease-out forwards;
}

@keyframes click-heart-rise {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(0.5);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, calc(-50% - 80px)) scale(1.2) rotate(15deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-520__digit,
  .couple-520__heart,
  .petal-520,
  .promise-520__btn-heart {
    animation: none;
  }

  .hearts-canvas,
  .digits-canvas {
    display: none;
  }
}