:root {
  color-scheme: light;
  --ink: #16211f;
  --ink-soft: #3f4f4a;
  --paper: #fffdf7;
  --paper-strong: #f6f0e3;
  --mint: #8fd3bd;
  --mint-dark: #286b62;
  --coral: #ff7a59;
  --gold: #f2b84b;
  --violet: #6f58c9;
  --blue: #4e89ae;
  --line: rgba(22, 33, 31, 0.14);
  --shadow: 0 22px 70px rgba(22, 33, 31, 0.16);
  --warmth: 45;
  --glow: 35;
  --grain: 30;
  font-family:
    "Inter", "MiSans", "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
    system-ui, sans-serif;
  letter-spacing: 0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(22, 33, 31, 0.035) 1px, transparent 1px),
    linear-gradient(0deg, rgba(22, 33, 31, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, #fffdf7 0%, #eef8f4 38%, #fff7ed 72%, #fffdf7 100%);
  background-size: 36px 36px, 36px 36px, auto;
  overflow-x: hidden;
}

body.is-locked {
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

::selection {
  color: #fffdf7;
  background: var(--mint-dark);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, var(--coral), var(--gold), var(--mint));
  box-shadow: 0 0 18px rgba(255, 122, 89, 0.45);
}

.site-hero {
  position: relative;
  min-height: 92svh;
  display: grid;
  align-items: end;
  padding: 7.5rem 6vw 5.5rem;
  isolation: isolate;
  overflow: hidden;
  color: #fffdf7;
  background: #17201e;
}

.site-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(13, 21, 20, 0.84) 0%, rgba(13, 21, 20, 0.38) 45%, rgba(13, 21, 20, 0.72) 100%),
    linear-gradient(0deg, rgba(13, 21, 20, 0.88) 0%, rgba(13, 21, 20, 0.18) 42%, rgba(13, 21, 20, 0.4) 100%);
  pointer-events: none;
}

.hero-wash,
.hero-photo,
.sky-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-wash {
  z-index: -4;
  object-fit: cover;
  object-position: center center;
  filter: blur(18px) saturate(1.05);
  transform: scale(1.08);
  opacity: 0.65;
}

.hero-photo {
  z-index: -3;
  object-fit: cover;
  object-position: 54% center;
  opacity: 0.88;
  filter: saturate(1.04) contrast(0.98);
}

.sky-canvas {
  z-index: -2;
  opacity: 0.64;
  mix-blend-mode: screen;
}

.topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.75rem;
  padding: 1rem 6vw;
  color: #fffdf7;
  background: linear-gradient(180deg, rgba(13, 21, 20, 0.68), rgba(13, 21, 20, 0));
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.75rem;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid rgba(255, 253, 247, 0.5);
  border-radius: 999px;
  background: rgba(255, 253, 247, 0.13);
  box-shadow: inset 0 0 18px rgba(255, 253, 247, 0.12);
}

.nav-links {
  gap: 0.35rem;
  padding: 0.35rem;
  border: 1px solid rgba(255, 253, 247, 0.24);
  border-radius: 999px;
  background: rgba(10, 16, 15, 0.25);
  backdrop-filter: blur(18px);
}

.nav-links a {
  display: grid;
  min-width: 4.5rem;
  min-height: 2.3rem;
  place-items: center;
  border-radius: 999px;
  color: rgba(255, 253, 247, 0.88);
  font-size: 0.95rem;
  transition:
    background 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--ink);
  background: #fffdf7;
  transform: translateY(-1px);
  outline: none;
}

.person-tag {
  position: absolute;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid rgba(255, 253, 247, 0.42);
  border-radius: 999px;
  background: rgba(10, 16, 15, 0.34);
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.16);
}

.person-tag span {
  display: grid;
  width: 1.7rem;
  height: 1.7rem;
  place-items: center;
  border-radius: 999px;
  color: var(--ink);
  background: var(--gold);
  font-weight: 900;
}

.person-tag strong {
  white-space: nowrap;
}

.tag-yjl {
  left: 10%;
  top: 43%;
}

.tag-lsq {
  right: 13%;
  top: 32%;
}

.hero-copy {
  position: relative;
  z-index: 4;
  max-width: 54rem;
}

.kicker {
  margin: 0 0 0.9rem;
  color: var(--coral);
  font-size: 0.95rem;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-copy .kicker {
  color: var(--gold);
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: 4.7rem;
  font-weight: 950;
  text-wrap: balance;
}

h2 {
  font-size: 2.7rem;
  font-weight: 930;
  text-wrap: balance;
}

h3 {
  font-size: 1.35rem;
  font-weight: 880;
}

.hero-lead {
  max-width: 44rem;
  margin: 1.35rem 0 0;
  color: rgba(255, 253, 247, 0.88);
  font-size: 1.22rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.primary-action,
.ghost-action,
.download-button,
.wish-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 3rem;
  min-width: 9rem;
  padding: 0.78rem 1.05rem;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 850;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.primary-action {
  color: var(--ink);
  background: linear-gradient(135deg, #fffdf7, #f7d37a);
  box-shadow: 0 18px 46px rgba(242, 184, 75, 0.3);
}

.ghost-action {
  color: #fffdf7;
  border: 1px solid rgba(255, 253, 247, 0.38);
  background: rgba(255, 253, 247, 0.12);
  backdrop-filter: blur(18px);
}

.primary-action:hover,
.ghost-action:hover,
.download-button:hover,
.wish-form button:hover,
.primary-action:focus-visible,
.ghost-action:focus-visible,
.download-button:focus-visible,
.wish-form button:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

main {
  position: relative;
  z-index: 1;
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat-tile {
  min-height: 10.5rem;
  padding: 1.4rem;
  background: rgba(255, 253, 247, 0.88);
}

.stat-tile span,
.stat-tile small {
  display: block;
  color: var(--ink-soft);
}

.stat-tile strong {
  display: block;
  margin: 0.6rem 0 0.25rem;
  font-size: 2.35rem;
  line-height: 1;
}

.archive-section,
.letters-section,
.lab-section,
.wish-section,
.future-section {
  padding: 6rem 6vw;
}

.archive-section {
  background:
    linear-gradient(135deg, rgba(143, 211, 189, 0.26), transparent 35%),
    var(--paper);
}

.letters-section {
  background: #eef8f4;
}

.lab-section {
  color: #fffdf7;
  background:
    linear-gradient(135deg, rgba(255, 122, 89, 0.2), transparent 28%),
    linear-gradient(180deg, #17201e, #25342f);
}

.wish-section {
  background: var(--paper);
}

.future-section {
  background:
    linear-gradient(135deg, rgba(78, 137, 174, 0.18), transparent 34%),
    #f9f2e8;
}

.section-heading {
  max-width: 48rem;
  margin: 0 auto 3rem;
  text-align: center;
}

.section-heading p:not(.kicker) {
  margin: 1rem auto 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
  line-height: 1.8;
}

.lab-section .section-heading p:not(.kicker),
.lab-section .section-heading h2 {
  color: #fffdf7;
}

.atlas-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  max-width: 72rem;
  margin: 0 auto;
}

.profile-card,
.future-card,
.wish-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 247, 0.86);
  box-shadow: var(--shadow);
}

.profile-card {
  min-height: 16rem;
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  position: relative;
}

.profile-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, transparent 0 45%, rgba(143, 211, 189, 0.25) 45% 60%, transparent 60%),
    linear-gradient(45deg, rgba(255, 122, 89, 0.11), transparent);
  opacity: 0.8;
}

.profile-card > * {
  position: relative;
}

.profile-card.wide {
  background: var(--ink);
  color: #fffdf7;
}

.profile-index {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--mint-dark);
  font-size: 2.2rem;
  font-weight: 950;
}

.profile-card.wide .profile-index {
  color: var(--gold);
}

.profile-card p,
.future-card p,
.wish-card p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.profile-card.wide p {
  color: rgba(255, 253, 247, 0.78);
}

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  max-width: 72rem;
  margin: 2rem auto 0;
  padding-top: 2.7rem;
}

.timeline-line {
  position: absolute;
  top: 1.1rem;
  left: 5%;
  right: 5%;
  height: 2px;
  background: linear-gradient(90deg, var(--coral), var(--gold), var(--mint-dark));
}

.timeline article {
  position: relative;
  padding: 1.1rem 0 0;
}

.timeline article::before {
  content: "";
  position: absolute;
  top: -1.95rem;
  left: 0;
  width: 1rem;
  height: 1rem;
  border: 4px solid var(--paper);
  border-radius: 999px;
  background: var(--coral);
  box-shadow: 0 0 0 1px var(--line);
}

.timeline time {
  color: var(--mint-dark);
  font-weight: 900;
}

.timeline p {
  color: var(--ink-soft);
  line-height: 1.75;
}

.letter-stage {
  display: grid;
  grid-template-columns: 13rem minmax(0, 44rem);
  align-items: stretch;
  justify-content: center;
  gap: 1.2rem;
}

.letter-tabs {
  display: grid;
  gap: 0.7rem;
}

.letter-tab,
.mode-button {
  min-height: 3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 253, 247, 0.72);
  cursor: pointer;
  font-weight: 850;
  transition:
    transform 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.letter-tab:hover,
.letter-tab:focus-visible,
.mode-button:hover,
.mode-button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.letter-tab.is-active,
.mode-button.is-active {
  color: #fffdf7;
  background: var(--ink);
}

.letter-paper {
  min-height: 18rem;
  padding: 2rem;
  border: 1px solid rgba(22, 33, 31, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(22, 33, 31, 0.055) 1px, transparent 1px),
    linear-gradient(180deg, #fffdf7, #fff7e8);
  background-size: 100% 2rem, auto;
  box-shadow: var(--shadow);
}

.letter-date {
  margin: 0 0 1.25rem;
  color: var(--coral);
  font-weight: 900;
}

.letter-paper p:last-child {
  color: var(--ink-soft);
  font-size: 1.08rem;
  line-height: 1.9;
}

.photo-lab {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
  gap: 1.5rem;
  align-items: stretch;
  max-width: 78rem;
  margin: 0 auto;
}

.lab-frame {
  position: relative;
  min-height: 34rem;
  margin: 0;
  border: 1px solid rgba(255, 253, 247, 0.24);
  border-radius: 8px;
  background: #101816;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.26);
  overflow: hidden;
}

.lab-frame::before,
.lab-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.lab-frame::before {
  z-index: 2;
  opacity: calc(var(--grain) / 100);
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(0, 0, 0, 0.08) 1px, transparent 1px);
  background-size: 7px 7px;
  mix-blend-mode: overlay;
}

.lab-frame::after {
  z-index: 3;
  background:
    radial-gradient(circle at 35% 20%, rgba(255, 244, 197, calc(var(--glow) / 115)), transparent 30%),
    linear-gradient(135deg, rgba(255, 122, 89, calc(var(--warmth) / 300)), transparent 45%),
    linear-gradient(0deg, rgba(0, 0, 0, 0.2), transparent 34%);
}

.lab-frame img {
  width: 100%;
  height: 100%;
  min-height: 34rem;
  object-fit: cover;
  object-position: center;
  filter: var(--lab-filter, saturate(1.08) contrast(1.02));
  transform: scale(1.01);
}

.lab-frame figcaption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 4;
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  color: #fffdf7;
  font-weight: 900;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.45);
}

.mode-film {
  --lab-filter: saturate(1.08) contrast(1.02) sepia(0.07);
}

.mode-sun {
  --lab-filter: saturate(1.18) contrast(1.04) brightness(1.04);
}

.mode-ink {
  --lab-filter: saturate(0.92) contrast(1.08) hue-rotate(8deg);
}

.mode-yearbook {
  --lab-filter: saturate(0.72) contrast(1.14) sepia(0.18);
}

.lab-controls {
  display: grid;
  align-content: start;
  gap: 1.1rem;
  min-height: 34rem;
  padding: 1.2rem;
  border: 1px solid rgba(255, 253, 247, 0.2);
  border-radius: 8px;
  background: rgba(255, 253, 247, 0.08);
  backdrop-filter: blur(18px);
}

.mode-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.mode-button {
  color: #fffdf7;
  border-color: rgba(255, 253, 247, 0.25);
  background: rgba(255, 253, 247, 0.1);
}

.mode-button.is-active {
  color: var(--ink);
  background: #fffdf7;
}

.range-row {
  display: grid;
  gap: 0.65rem;
  color: rgba(255, 253, 247, 0.9);
  font-weight: 800;
}

.range-row input {
  width: 100%;
  accent-color: var(--gold);
}

.download-button {
  width: 100%;
  margin-top: 0.25rem;
  color: var(--ink);
  background: linear-gradient(135deg, var(--mint), #fffdf7);
}

.download-status {
  min-height: 1.5rem;
  margin: 0;
  color: rgba(255, 253, 247, 0.76);
  line-height: 1.5;
}

.wish-form {
  display: grid;
  grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr) auto;
  gap: 0.9rem;
  max-width: 76rem;
  margin: 0 auto 1.2rem;
  align-items: end;
}

.wish-form label {
  display: grid;
  gap: 0.45rem;
  color: var(--ink-soft);
  font-weight: 850;
}

.wish-form input,
.wish-form textarea {
  width: 100%;
  min-height: 3rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem 0.9rem;
  color: var(--ink);
  background: rgba(255, 253, 247, 0.86);
  outline: none;
  resize: vertical;
}

.wish-form input:focus,
.wish-form textarea:focus {
  border-color: var(--mint-dark);
  box-shadow: 0 0 0 4px rgba(143, 211, 189, 0.24);
}

.wish-form button {
  min-width: 8rem;
  color: #fffdf7;
  background: var(--ink);
}

.wish-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  max-width: 76rem;
  margin: 0 auto;
}

.wish-card {
  min-height: 10rem;
  padding: 1rem;
}

.wish-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--mint-dark);
  font-weight: 900;
}

.wish-card time {
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 700;
}

.future-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  max-width: 76rem;
  margin: 0 auto;
}

.future-card {
  min-height: 14rem;
  padding: 1.15rem;
}

.future-card span {
  display: grid;
  width: 2.6rem;
  height: 2.6rem;
  place-items: center;
  margin-bottom: 2rem;
  border-radius: 999px;
  color: var(--ink);
  background: var(--gold);
  font-weight: 950;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 6vw;
  color: rgba(255, 253, 247, 0.76);
  background: var(--ink);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #fffdf7;
  font-weight: 850;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 650ms ease,
    transform 650ms ease;
}

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

@media (max-width: 980px) {
  h1 {
    font-size: 3.45rem;
  }

  h2 {
    font-size: 2.15rem;
  }

  .stats-band,
  .atlas-grid,
  .timeline,
  .photo-lab,
  .wish-form,
  .wish-list,
  .future-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .letter-stage {
    grid-template-columns: 1fr;
  }

  .letter-tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .photo-lab {
    grid-template-columns: 1fr;
  }

  .lab-controls {
    min-height: auto;
  }

  .wish-form {
    align-items: stretch;
  }

  .wish-message,
  .wish-form button {
    grid-column: span 2;
  }
}

@media (max-width: 720px) {
  .site-hero {
    min-height: 94svh;
    padding: 6.4rem 1rem 2.5rem;
    align-items: end;
  }

  .hero-photo {
    top: 4.5rem;
    bottom: auto;
    height: 58svh;
    object-fit: contain;
    object-position: center;
    opacity: 0.96;
  }

  .hero-wash {
    filter: blur(24px) saturate(1.08);
    opacity: 0.8;
  }

  .site-hero::after {
    background:
      linear-gradient(180deg, rgba(13, 21, 20, 0.4) 0%, rgba(13, 21, 20, 0.16) 45%, rgba(13, 21, 20, 0.96) 78%, rgba(13, 21, 20, 0.98) 100%),
      linear-gradient(90deg, rgba(13, 21, 20, 0.5), rgba(13, 21, 20, 0.15), rgba(13, 21, 20, 0.5));
  }

  .topbar {
    min-height: 4.2rem;
    padding: 0.75rem 1rem;
  }

  .brand span:last-child {
    display: none;
  }

  .nav-links {
    gap: 0.15rem;
  }

  .nav-links a {
    min-width: 3.7rem;
    min-height: 2.15rem;
    font-size: 0.88rem;
  }

  .person-tag {
    padding: 0.4rem 0.55rem;
    font-size: 0.9rem;
  }

  .person-tag span {
    width: 1.45rem;
    height: 1.45rem;
  }

  .tag-yjl {
    left: 5%;
    top: 30%;
  }

  .tag-lsq {
    right: 5%;
    top: 24%;
  }

  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 1.85rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .hero-lead {
    font-size: 1.02rem;
  }

  .hero-actions {
    gap: 0.65rem;
  }

  .primary-action,
  .ghost-action,
  .download-button,
  .wish-form button {
    min-width: 7.8rem;
  }

  .archive-section,
  .letters-section,
  .lab-section,
  .wish-section,
  .future-section {
    padding: 4.2rem 1rem;
  }

  .stats-band,
  .atlas-grid,
  .timeline,
  .wish-list,
  .future-grid {
    grid-template-columns: 1fr;
  }

  .stat-tile {
    min-height: 8rem;
  }

  .profile-card {
    min-height: 13rem;
  }

  .timeline {
    padding-top: 0;
  }

  .timeline-line {
    left: 0.5rem;
    right: auto;
    top: 0;
    bottom: 0;
    width: 2px;
    height: auto;
  }

  .timeline article {
    padding: 0 0 0 2.1rem;
  }

  .timeline article::before {
    top: 0.15rem;
    left: 0.08rem;
  }

  .letter-paper {
    padding: 1.3rem;
  }

  .letter-tabs {
    gap: 0.45rem;
  }

  .letter-tab {
    min-height: 2.75rem;
  }

  .lab-frame,
  .lab-frame img {
    min-height: 24rem;
  }

  .mode-switch {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wish-form {
    grid-template-columns: 1fr;
  }

  .wish-message,
  .wish-form button {
    grid-column: auto;
  }

  .wish-form button {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 2.35rem;
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .primary-action,
  .ghost-action {
    width: 100%;
  }

  .tag-yjl {
    top: 28%;
  }

  .tag-lsq {
    top: 22%;
  }

  .lab-frame,
  .lab-frame img {
    min-height: 20rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .sky-canvas {
    display: none;
  }
}