:root {
  --bg: #f5f8fc;
  --bg-deep: #e8f0f8;
  --ink: #2c3340;
  --muted: #7a8494;
  --blue: #8bb4d9;
  --blue-deep: #5b84ad;
  --blue-soft: #d6e7f5;
  --yellow: #ffe6a8;
  --yellow-ink: #b8873a;
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 14px 36px rgba(60, 90, 120, 0.1);
  --radius: 22px;
  --font-display: "ZCOOL KuaiLe", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 520px at 8% -8%, rgba(139, 180, 217, 0.28), transparent 55%),
    radial-gradient(780px 480px at 100% 0%, rgba(139, 180, 217, 0.22), transparent 50%),
    radial-gradient(600px 400px at 50% 100%, rgba(255, 230, 168, 0.2), transparent 55%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
video {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

button,
input {
  font: inherit;
}

strong {
  font-weight: 700;
  color: var(--blue-deep);
}

.soft {
  color: var(--muted);
  font-size: 0.92em;
}

[hidden] {
  display: none !important;
}

/* —— Gate —— */
.gate {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  padding-bottom: calc(24px + var(--safe-bottom));
  background:
    radial-gradient(700px 380px at 50% 18%, rgba(139, 180, 217, 0.25), transparent 60%),
    var(--bg);
  overflow: hidden;
}

.gate__deco {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.55;
  pointer-events: none;
}

.gate__deco--1 {
  width: 120px;
  height: 120px;
  top: 12%;
  left: 8%;
  background: rgba(139, 180, 217, 0.45);
  animation: bob 5s ease-in-out infinite;
}

.gate__deco--2 {
  width: 90px;
  height: 90px;
  right: 10%;
  bottom: 18%;
  background: rgba(255, 230, 168, 0.55);
  animation: bob 6s ease-in-out infinite reverse;
}

@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.gate__card {
  position: relative;
  width: min(100%, 360px);
  text-align: center;
  padding: 40px 28px 28px;
  border-radius: 32px;
  background: var(--card);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  border: 2px solid rgba(255, 255, 255, 0.9);
}

.gate__stamp {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%) rotate(-6deg);
  margin: 0;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue-deep);
  font-family: var(--font-display);
  font-size: 0.85rem;
  box-shadow: 0 6px 16px rgba(91, 132, 173, 0.18);
}

.gate__eyebrow {
  margin: 10px 0 8px;
  color: var(--blue-deep);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.gate__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 13vw, 3.6rem);
  font-weight: 400;
  line-height: 1.05;
  color: var(--ink);
}

.gate__hint {
  margin: 12px 0 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.gate__form {
  display: grid;
  gap: 12px;
}

.gate__input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid rgba(139, 180, 217, 0.45);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--ink);
  text-align: center;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.gate__input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(139, 180, 217, 0.2);
}

.gate__btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--blue), #6a96bf);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(91, 132, 173, 0.28);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.gate__btn:active {
  transform: scale(0.98);
  filter: brightness(0.97);
}

.gate__error {
  margin: 12px 0 0;
  color: #c46b75;
  font-size: 0.9rem;
}

.gate__foot {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.gate.is-leaving {
  animation: gateOut 0.55s ease forwards;
  pointer-events: none;
}

@keyframes gateOut {
  to {
    opacity: 0;
    transform: translateY(-12px) scale(0.98);
  }
}

/* —— Album —— */
.album {
  overflow-x: hidden;
}

.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px calc(48px + var(--safe-bottom));
}

.hero__veil {
  position: absolute;
  inset: 14% 6% auto;
  height: 40%;
  border-radius: 45% 55% 50% 50%;
  background:
    radial-gradient(circle at 30% 40%, rgba(139, 180, 217, 0.35), transparent 60%),
    radial-gradient(circle at 70% 55%, rgba(180, 210, 235, 0.4), transparent 55%);
  filter: blur(10px);
  pointer-events: none;
  animation: softFloat 8s ease-in-out infinite alternate;
}

.hero__dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__dots span {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(139, 180, 217, 0.5);
  animation: twinkle 3.6s ease-in-out infinite;
}

.hero__dots span:nth-child(1) { top: 18%; left: 14%; animation-delay: 0s; }
.hero__dots span:nth-child(2) { top: 26%; right: 16%; width: 8px; height: 8px; background: rgba(139, 180, 217, 0.55); animation-delay: 0.6s; }
.hero__dots span:nth-child(3) { bottom: 28%; left: 18%; width: 7px; height: 7px; background: rgba(255, 230, 168, 0.7); animation-delay: 1.1s; }
.hero__dots span:nth-child(4) { bottom: 34%; right: 20%; animation-delay: 1.7s; }
.hero__dots span:nth-child(5) { top: 42%; left: 8%; width: 6px; height: 6px; background: rgba(139, 180, 217, 0.45); animation-delay: 2.2s; }

@keyframes twinkle {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.25); }
}

@keyframes softFloat {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(12px) scale(1.04); }
}

.hero__stamp,
.hero__eyebrow,
.hero__title,
.hero__day,
.hero__sub,
.hero__scroll {
  position: relative;
}

.hero__stamp {
  margin: 0 0 14px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  border: 1.5px dashed rgba(139, 180, 217, 0.55);
  color: var(--blue-deep);
  font-family: var(--font-display);
  font-size: 0.9rem;
  transform: rotate(-4deg);
}

.hero__eyebrow {
  margin: 0 0 12px;
  color: var(--blue-deep);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 17vw, 4.8rem);
  font-weight: 400;
  line-height: 1;
}

.hero__day {
  margin: 16px 0 0;
  font-size: 1.05rem;
  color: var(--muted);
  letter-spacing: 0.12em;
}

.hero__num {
  display: inline-block;
  padding: 2px 12px;
  margin: 0 2px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(139, 180, 217, 0.35), rgba(139, 180, 217, 0.35));
  color: var(--blue-deep);
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0;
  vertical-align: -2px;
}

.hero__sub {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero__scroll {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(28px + var(--safe-bottom));
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  animation: nudge 1.8s ease-in-out infinite;
}

@keyframes nudge {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* letter */
.letter {
  width: min(100%, 560px);
  margin: 0 auto 28px;
  padding: 28px 24px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
  border: 2px solid rgba(139, 180, 217, 0.45);
}

.letter p {
  margin: 0 0 14px;
  line-height: 1.85;
  font-size: 0.98rem;
}

.letter__hi,
.letter__bye {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--blue-deep);
}

.letter__bye {
  margin-bottom: 0 !important;
  color: var(--blue-deep);
}

.moments {
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 8px 18px 28px;
  display: grid;
  gap: 30px;
}

.chapter {
  text-align: center;
  padding: 10px 8px 2px;
}

.chapter__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(139, 180, 217, 0.2);
  color: var(--blue-deep);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.chapter__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 400;
}

.chapter__desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.polaroid {
  position: relative;
  padding: 14px 14px 10px;
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
}

.polaroid--tilt {
  transform: rotate(-1.6deg);
}

.polaroid--tilt-rev {
  transform: rotate(1.4deg);
}

.polaroid__media {
  margin: 0;
  overflow: hidden;
  border-radius: 12px;
  background: var(--bg-deep);
}

.polaroid__note {
  margin: 10px 0 2px;
  text-align: center;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--muted);
}

.sticker {
  position: absolute;
  z-index: 2;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(139, 180, 217, 0.92);
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.82rem;
  box-shadow: 0 8px 18px rgba(106, 150, 191, 0.28);
  transform: rotate(-8deg);
}

.sticker--tl { top: 6px; left: 4px; }
.sticker--tr { top: 8px; right: 4px; transform: rotate(7deg); }

.sticker--soft {
  background: rgba(91, 132, 173, 0.95);
  box-shadow: 0 8px 18px rgba(91, 132, 173, 0.28);
}

.sticker--yellow {
  background: rgba(240, 196, 98, 0.95);
  color: #7a5520;
  box-shadow: 0 8px 18px rgba(240, 196, 98, 0.28);
}

.moment__caption {
  margin: 14px 8px 0;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.75;
  text-align: center;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: start;
}

.pair__item {
  margin: 0;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: var(--shadow);
  background: #fff;
  padding: 8px;
}

.pair__item img {
  border-radius: 10px;
}

.pair__item--offset {
  margin-top: 28px;
}

.bubble {
  justify-self: center;
  max-width: 90%;
  margin: 2px 0;
  padding: 14px 18px;
  border-radius: 20px 20px 20px 8px;
  background: rgba(139, 180, 217, 0.16);
  color: var(--blue-deep);
  font-size: 0.92rem;
  line-height: 1.65;
  text-align: left;
}

.bubble--big {
  max-width: 100%;
}

.bubble--soft {
  border-radius: 20px 20px 8px 20px;
  background: rgba(139, 180, 217, 0.16);
  color: var(--blue-deep);
}

.bubble__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  opacity: 0.9;
}

/* pedia */
.pedia {
  width: min(100%, 560px);
  margin: 18px auto;
  padding: 28px 20px 24px;
  text-align: center;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.72);
  border: 2px dashed rgba(139, 180, 217, 0.45);
}

.pedia__eyebrow {
  margin: 0;
  color: var(--blue-deep);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.pedia__title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 400;
}

.pedia__desc {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.88rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.chip {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(139, 180, 217, 0.18);
  color: var(--blue-deep);
  font-size: 0.84rem;
  line-height: 1.3;
}

.chip--soft {
  background: rgba(139, 180, 217, 0.2);
  color: var(--blue-deep);
}

.chip--yellow {
  background: rgba(255, 230, 168, 0.55);
  color: var(--yellow-ink);
}

.pedia__foot {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* promise */
.promise {
  width: min(100%, 560px);
  margin: 10px auto 0;
  padding: 26px 22px;
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(139, 180, 217, 0.14), rgba(255, 230, 168, 0.18));
  text-align: center;
}

.promise__eyebrow {
  margin: 0;
  color: var(--blue-deep);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.promise__title {
  margin: 8px 0 16px;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 400;
}

.promise__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  text-align: left;
}

.promise__list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
}

.promise__num {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue-deep);
  font-family: var(--font-display);
  font-size: 0.85rem;
}

.promise__note {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.ending {
  width: min(100%, 560px);
  margin: 24px auto 0;
  padding: 40px 28px calc(80px + var(--safe-bottom));
  text-align: center;
}

.ending__stamp {
  display: inline-block;
  margin: 0 0 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255, 230, 168, 0.65);
  color: var(--yellow-ink);
  font-family: var(--font-display);
  font-size: 0.85rem;
  transform: rotate(3deg);
}

.ending__label {
  margin: 0 0 8px;
  color: var(--blue-deep);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.ending__lead {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 7vw, 2.2rem);
  line-height: 1.35;
}

.ending__note {
  margin: 20px auto 0;
  max-width: 20em;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

.ending__sign {
  margin: 26px 0 18px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

.heart-btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 22px;
  background: linear-gradient(135deg, var(--blue), #6a96bf);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(91, 132, 173, 0.28);
}

.heart-btn span {
  display: inline-block;
  min-width: 1.4em;
  margin-left: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.28);
}

.float-hearts {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
  overflow: hidden;
}

.float-heart {
  position: absolute;
  bottom: 18%;
  left: 50%;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: #6a96bf;
  animation: floatUp 1.2s ease-out forwards;
}

@keyframes floatUp {
  0% { opacity: 0; transform: translate(-50%, 20px) scale(0.8); }
  20% { opacity: 1; }
  100% { opacity: 0; transform: translate(calc(-50% + var(--dx, 0px)), -140px) scale(1.15); }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero__veil,
  .hero__scroll,
  .hero__dots span,
  .gate__deco,
  .reveal,
  .float-heart {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}