/* opi static site — base tokens, shell, type, controls. */
*,
*::before,
*::after { box-sizing: border-box; }

:root {
  --paper: #fbfaf6;
  --paper-2: #f4f1e8;
  --paper-3: #ece8dc;
  --ink: #14201d;
  --ink-soft: #52615b;
  --ink-faint: #8b9791;
  --primary: #2e8b80;
  --primary-deep: #1e6b63;
  --primary-soft: #dff0ec;
  --accent: #d9553f;
  --blush: #f5a6b4;
  --line: rgba(20, 32, 29, .12);
  --line-strong: rgba(20, 32, 29, .22);
  --card: rgba(255, 255, 255, .68);
  --shadow: 0 30px 70px -42px rgba(20, 32, 29, .42);
  --radius: 22px;
  --radius-sm: 14px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  scroll-padding-top: 0;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 560px at 82% 8%, rgba(46, 139, 128, .12), transparent 62%),
    radial-gradient(700px 480px at 6% 38%, rgba(245, 166, 180, .12), transparent 68%),
    linear-gradient(180deg, #fbfaf6 0%, #f7f4ec 58%, #fbfaf6 100%);
}

/* 3D 环境层：纯 CSS 3D（合成器动画，不占主线程），所有分节共用。 */
.ambient-3d {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  perspective: 1000px;
  perspective-origin: 50% 42%;
}
.ambient-3d i {
  position: absolute;
  display: block;
  border: 1px solid rgba(46, 139, 128, .18);
  transform-style: preserve-3d;
  will-change: transform;
}
.ambient-key {
  width: 132px;
  height: 132px;
  border-radius: 18px;
  box-shadow: 16px 16px 0 -7px rgba(46, 139, 128, .05), 16px 16px 0 -6px rgba(46, 139, 128, .13);
  animation: ambient-key-a 17s ease-in-out infinite;
}
.ambient-key.key-a { left: 5%; top: 20%; }
.ambient-key.key-b { right: 7%; top: 30%; width: 96px; height: 96px; border-color: rgba(217, 85, 63, .16); box-shadow: 12px 12px 0 -5px rgba(217, 85, 63, .05), 12px 12px 0 -4px rgba(217, 85, 63, .12); animation: ambient-key-b 21s ease-in-out infinite; }
.ambient-key.key-c { left: 16%; bottom: 12%; width: 74px; height: 74px; border-color: rgba(78, 151, 230, .18); box-shadow: 10px 10px 0 -4px rgba(78, 151, 230, .12); animation: ambient-key-a 25s ease-in-out infinite reverse; }
.ambient-ring {
  width: 520px;
  height: 520px;
  border-radius: 50%;
  border-color: rgba(46, 139, 128, .1);
  animation: ambient-ring-a 28s linear infinite;
}
.ambient-ring.ring-a { left: -160px; bottom: -220px; }
.ambient-ring.ring-b { right: -220px; top: -180px; width: 420px; height: 420px; border-color: rgba(245, 166, 180, .14); animation: ambient-ring-b 34s linear infinite; }
main { position: relative; z-index: 1; }
@keyframes ambient-key-a {
  0%, 100% { transform: translate3d(0, 0, 0) rotateX(58deg) rotateZ(-16deg); }
  50% { transform: translate3d(20px, -26px, 46px) rotateX(63deg) rotateZ(-6deg); }
}
@keyframes ambient-key-b {
  0%, 100% { transform: translate3d(0, 0, 0) rotateX(62deg) rotateZ(24deg); }
  50% { transform: translate3d(-18px, 22px, 30px) rotateX(55deg) rotateZ(12deg); }
}
@keyframes ambient-ring-a {
  from { transform: rotateX(72deg) rotateZ(0deg); }
  to { transform: rotateX(72deg) rotateZ(360deg); }
}
@keyframes ambient-ring-b {
  from { transform: rotateX(68deg) rotateZ(360deg); }
  to { transform: rotateX(68deg) rotateZ(0deg); }
}

/* 首屏加载模块：一枚在 3D 中翻转的小欧，加载完即淡出。 */
.boot-3d {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 80;
  width: 44px;
  height: 44px;
  perspective: 480px;
  pointer-events: none;
  transition: opacity .35s var(--ease), visibility .35s;
}
.boot-3d img {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 10px 14px rgba(20, 32, 29, .18));
  animation: boot-flip 1.15s linear infinite;
}
html.is-ready .boot-3d { opacity: 0; visibility: hidden; }
html.is-ready .boot-3d img { animation: none; }
@keyframes boot-flip {
  from { transform: rotateY(0deg); }
  to { transform: rotateY(360deg); }
}

::selection { background: rgba(46, 139, 128, .24); color: var(--ink); }

a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { color: inherit; }
button, .btn, .form-card, .download-card, .memory-intro-skip { touch-action: manipulation; }
img, svg, canvas { display: block; max-width: 100%; }
img { height: auto; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-size: .84rem;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 2px;
  z-index: 70;
  background: transparent;
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  padding: 14px clamp(18px, 4.6vw, 64px);
  border-bottom: 1px solid transparent;
  /* Opaque enough without backdrop-filter: blur() repaints the header on every
     scroll frame and pushed interaction frames past the 50 ms budget. */
  background: linear-gradient(180deg, rgba(251, 250, 246, .97), rgba(251, 250, 246, .88));
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(251, 250, 246, .9);
}

.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand img { width: 36px; height: 36px; filter: drop-shadow(0 6px 10px rgba(20, 32, 29, .14)); }
.brand-copy { display: flex; flex-direction: column; line-height: 1.05; }
.brand-copy strong { font-size: 1rem; letter-spacing: .18em; }
.brand-copy small { margin-top: 3px; color: var(--ink-soft); font-size: .66rem; letter-spacing: .08em; }

.site-nav { display: flex; align-items: center; gap: clamp(10px, 1.5vw, 24px); margin-left: auto; }
.site-nav a {
  position: relative;
  padding: 6px 2px;
  color: var(--ink-soft);
  font-size: .78rem;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: color .2s var(--ease);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .25s var(--ease);
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }

.header-actions { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.header-link { color: var(--ink-soft); font-family: var(--font-mono); font-size: .72rem; letter-spacing: .02em; }
.header-link:hover { color: var(--primary-deep); }
.header-github {
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .72rem;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.header-github:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.container { width: min(1180px, 100%); margin-inline: auto; }

.panel {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: clamp(96px, 12vh, 148px) clamp(20px, 5.6vw, 80px) clamp(54px, 8vh, 92px);
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--primary-deep);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(217, 85, 63, .45);
  animation: pulse 2.8s ease-out infinite;
}

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
h1 {
  margin-bottom: 24px;
  font-size: clamp(2.9rem, 5.7vw, 5.4rem);
  line-height: .98;
  letter-spacing: -.065em;
  font-weight: 800;
}
h1 .line { display: block; }
h1 em, h2 em { font-style: normal; color: var(--primary-deep); }
h2 {
  margin-bottom: 22px;
  font-size: clamp(2rem, 4.4vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -.045em;
  font-weight: 800;
}
h3 { margin-bottom: 8px; font-size: 1.06rem; line-height: 1.3; letter-spacing: -.02em; }

.lede { max-width: 34rem; margin-bottom: 30px; color: var(--ink-soft); font-size: clamp(1rem, 1.5vw, 1.17rem); line-height: 1.85; }
.lede strong { color: var(--ink); }
.body, .body-lg { color: var(--ink-soft); }
.body-lg { font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.8; }
.body { font-size: .96rem; line-height: 1.85; }
.body strong, .body-lg strong { color: var(--ink); }
code { padding: .12em .38em; border-radius: 6px; background: var(--paper-3); font-family: var(--font-mono); font-size: .88em; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 650;
  letter-spacing: .02em;
  transition: transform .22s var(--ease), background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--ink); color: var(--paper); box-shadow: 0 18px 34px -20px rgba(20, 32, 29, .65); }
.btn-primary:hover { background: var(--primary-deep); box-shadow: 0 22px 38px -18px rgba(30, 107, 99, .55); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--primary); background: rgba(46, 139, 128, .07); }
.btn-meta { padding: 3px 7px; border-radius: 999px; background: rgba(255, 255, 255, .16); font-family: var(--font-mono); font-size: .64rem; font-weight: 500; letter-spacing: .02em; }

.text-link { display: inline-flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--line-strong); padding-bottom: 2px; color: var(--primary-deep); font-size: .84rem; transition: border-color .2s, color .2s; }
.text-link:hover { border-color: var(--accent); color: var(--accent); }

.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: clamp(24px, 5vw, 80px); margin-bottom: clamp(28px, 4vh, 46px); }
.section-head h2 { margin-bottom: 0; }
.section-side { max-width: 28rem; margin: 0 0 8px; color: var(--ink-soft); font-size: .88rem; line-height: 1.8; }

.section-dots {
  position: fixed;
  right: clamp(12px, 2.2vw, 30px);
  top: 50%;
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transform: translateY(-50%);
}
.section-dots a {
  width: 8px;
  height: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper);
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.section-dots a:hover { border-color: var(--primary); transform: scale(1.2); }
.section-dots a[aria-current="true"] { background: var(--accent); border-color: var(--accent); transform: scale(1.25); }

.back-to-top {
  position: fixed;
  right: clamp(12px, 2.2vw, 30px);
  bottom: clamp(16px, 3vh, 32px);
  z-index: 65;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 10px 28px -16px rgba(20, 32, 29, .5);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), border-color .2s var(--ease);
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.back-to-top:hover { border-color: var(--primary); transform: translateY(-2px); }
.back-to-top img { width: 100%; height: 100%; border-radius: 50%; object-fit: contain; }

/* ---------- 回忆时光机（首次进入 / 回忆按钮） ---------- */
.release-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.memory-overlay {
  position: fixed; inset: 0; z-index: 90; display: flex; align-items: center; justify-content: center;
  padding: 20px; background: #14201d;
  opacity: 0; visibility: hidden; transition: opacity .22s var(--ease), visibility .22s var(--ease);
}
.memory-overlay[hidden] { display: none; }
.memory-overlay.is-open { opacity: 1; visibility: visible; }
/* First painted frame is the overlay shell only; the card is revealed on the next
   frame so opening never waits on the 90+ node release history paint. */
.memory-overlay.is-shell .memory-card { visibility: hidden; }
body.memory-open { overflow: hidden; }
.memory-card {
  display: flex; flex-direction: column; width: min(760px, 100%); max-height: min(86vh, 760px);
  overflow: hidden; border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--paper); box-shadow: 0 40px 100px -40px rgba(20, 32, 29, .7);
  transform: translateY(12px) scale(.985); transition: transform .28s var(--ease);
}
.memory-overlay.is-open .memory-card { transform: none; }
.memory-head { padding: 24px 28px 16px; border-bottom: 1px solid var(--line); }
.memory-head .eyebrow { margin-bottom: 8px; }
.memory-head h2 { margin-bottom: 8px; font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
.memory-head p { margin: 0; max-width: 38rem; color: var(--ink-soft); font-size: .82rem; line-height: 1.7; }
.memory-body { position: relative; min-height: 0; }
.memory-intro { position: absolute; inset: 0; z-index: 2; display: flex; align-items: center; justify-content: center; background: var(--paper); opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .26s var(--ease), visibility .26s var(--ease); }
.memory-intro.is-showing { opacity: 1; visibility: visible; }
.memory-intro::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(circle at 50% 44%, var(--intro-mood, #2E8B80), transparent 68%); opacity: .13; animation: memory-bg-breathe 4.4s ease-in-out infinite; }
.memory-intro-pane { position: absolute; inset: 0; z-index: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; width: 100%; height: 100%; padding: 18px 22px; opacity: 0; visibility: hidden; transition: opacity .3s var(--ease), visibility .3s var(--ease); }
.memory-intro-skip { position: absolute; right: 16px; bottom: 14px; z-index: 3; pointer-events: auto; padding: 7px 12px; border: 1px solid var(--line-strong); border-radius: 999px; background: rgba(251, 250, 246, .92); color: var(--ink-soft); font-size: .66rem; cursor: pointer; }
.memory-intro-skip:hover { border-color: var(--primary); color: var(--primary-deep); }
.memory-intro-pane.is-active { opacity: 1; visibility: visible; }
.memory-intro-single img { width: 112px; height: 112px; object-fit: contain; filter: drop-shadow(0 16px 22px rgba(20, 32, 29, .16)); }
.memory-intro-single p { margin: 0; color: var(--primary-deep); font-size: 1rem; font-weight: 700; letter-spacing: .06em; }
.memory-intro-single span { color: var(--ink-faint); font-family: var(--font-mono); font-size: .62rem; letter-spacing: .08em; }
@keyframes memory-bg-breathe { 0%, 100% { opacity: .08; } 50% { opacity: .18; } }
.memory-viewport { position: relative; flex: 1; min-height: 0; height: min(52vh, 420px); contain: layout paint; overflow-y: auto; overflow-x: hidden; overscroll-behavior: contain; -webkit-overflow-scrolling: touch; touch-action: pan-y; scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 7%, #000 93%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 7%, #000 93%, transparent 100%);
}
.memory-timeline { position: relative; margin: 0; padding: 6px 0 18px; list-style: none; }
.memory-forms-entry { padding: 16px 20px 18px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, rgba(46, 139, 128, .07), rgba(255, 255, 255, .25)); opacity: 0; transform: translateY(28px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.memory-forms-entry.is-in { opacity: 1; transform: none; }
.memory-forms-title { margin: 0 0 10px; color: var(--primary-deep); font-size: .78rem; font-weight: 700; letter-spacing: .04em; }
.memory-forms-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px 6px; }
.memory-forms-pet { position: relative; z-index: 0; display: flex; flex-direction: column; align-items: center; gap: 2px; margin: 0; padding: 5px 2px 4px; border-radius: 10px; overflow: hidden; }
.memory-forms-pet::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(circle at 50% 38%, var(--mood), transparent 70%); opacity: .18; animation: memory-mood-breathe 3.6s ease-in-out infinite; }
.memory-forms-pet img, .memory-forms-pet figcaption { position: relative; z-index: 1; }
.memory-forms-pet img { width: 48px; height: 48px; object-fit: contain; }
.memory-forms-pet figcaption { color: var(--ink-soft); font-size: .56rem; white-space: nowrap; }
@keyframes memory-mood-breathe { 0%, 100% { opacity: .12; transform: scale(.92); } 50% { opacity: .3; transform: scale(1.08); } }
.memory-item { display: grid; grid-template-columns: 6.4rem 5rem minmax(0, 1fr); gap: 10px; align-items: baseline;
  padding: 11px 24px; border-bottom: 1px solid var(--line); opacity: 0; transform: translateY(34px);
  transition: opacity .48s var(--ease), transform .48s var(--ease), background .3s var(--ease); }
.memory-item.is-in { opacity: 1; transform: none; }
.memory-item.is-in.is-current { z-index: 1; transform: scale(1.035); transform-origin: 14% 50%; background: rgba(46, 139, 128, .1); }
.memory-item.is-latest { background: rgba(46, 139, 128, .09); }
.memory-version { color: var(--primary-deep); font-family: var(--font-mono); font-size: .78rem; font-weight: 700; }
.memory-date { color: var(--ink-faint); font-family: var(--font-mono); font-size: .6rem; }
.memory-note { min-width: 0; overflow: hidden; color: var(--ink-soft); font-size: .78rem; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; white-space: normal; }
.memory-pet { display: flex; padding: 5px 24px; pointer-events: none; opacity: 0; transform: translateY(24px); transition: opacity .45s var(--ease), transform .45s var(--ease); }
.memory-pet.is-in { opacity: 1; transform: none; }
.memory-pet.is-right { justify-content: flex-end; padding-right: 12%; }
.memory-pet img { width: 54px; height: 54px; object-fit: contain; opacity: .9; }
.memory-foot { display: flex; align-items: center; gap: 14px; padding: 14px 24px 16px; border-top: 1px solid var(--line); }
.memory-hint { flex: 0 0 auto; color: var(--ink-faint); font-family: var(--font-mono); font-size: .58rem; letter-spacing: .04em; }
.memory-overlay.is-paused .memory-hint::before { content: "暂停中 · "; color: var(--accent); }
.memory-progress { flex: 1; height: 3px; overflow: hidden; border-radius: 99px; background: var(--paper-3); }
.memory-progress span { display: block; width: 100%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--accent)); transform: scaleX(0); transform-origin: 0 50%; }
.memory-foot .btn { flex: 0 0 auto; min-height: 38px; padding: 0 15px; font-size: .74rem; }
.memory-pause:disabled { opacity: .45; cursor: default; }
.memory-pause:disabled:hover { transform: none; }

.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 25px; height: 25px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

/* Reveal: visible by default; JS only adds motion when supported. */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.is-visible { opacity: 1; transform: none; }

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(217, 85, 63, .4); }
  70% { box-shadow: 0 0 0 10px rgba(217, 85, 63, 0); }
  100% { box-shadow: 0 0 0 0 rgba(217, 85, 63, 0); }
}
@keyframes float-slow { 0%, 100% { transform: translateY(0) rotate(-1deg); } 50% { transform: translateY(-10px) rotate(1deg); } }
@keyframes drift { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(0, -8px, 0); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}