/* ============ 色彩：白天是纸，夜晚是信 ============ */
:root {
  --paper: #f3ede2;
  --paper-2: #ebe3d5;
  --mat: #fbf8f2;
  --ink: #2b2622;
  --ink-2: #5d544b;
  --ink-3: #958a7d;
  --rose: #b8325a;
  --rose-2: rgba(184, 50, 90, 0.1);
  --gold: #a47c3b;
  --gold-2: rgba(164, 124, 59, 0.55);
  --rule: rgba(43, 38, 34, 0.14);
  --shadow: 0 1px 2px rgba(43,38,34,.08), 0 8px 24px rgba(43,38,34,.1), 0 24px 48px -12px rgba(43,38,34,.14);
  --grain-blend: multiply;
  --grain-opacity: .5;

  --kai: "LXGW WenKai Screen", "Kaiti SC", "STKaiti", "KaiTi", "楷体", serif;
  --num: "Cormorant Garamond", "Playfair Display", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  color-scheme: light;
}
[data-theme="dark"] {
  --paper: #10141b;
  --paper-2: #171c25;
  --mat: #e8e1d3;
  --ink: #ece4d6;
  --ink-2: #b8afa2;
  --ink-3: #7c776d;
  --rose: #ee8aa3;
  --rose-2: rgba(238, 138, 163, 0.12);
  --gold: #d8b679;
  --gold-2: rgba(216, 182, 121, 0.5);
  --rule: rgba(236, 228, 214, 0.12);
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.45);
  --grain-blend: screen;
  --grain-opacity: .12;
  color-scheme: dark;
}

/* ============ 基础 ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 64px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--kai);
  font-size: 17px;
  line-height: 1.9;
  overflow-x: hidden;
  transition: background-color .5s ease, color .5s ease;
  -webkit-font-smoothing: antialiased;
}
/* 纸张颗粒 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 100; pointer-events: none;
  opacity: var(--grain-opacity); mix-blend-mode: var(--grain-blend);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .5 0 0 0 0 .45 0 0 0 0 .4 0 0 0 .18 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--rose); outline-offset: 3px; border-radius: 4px; }

/* ============ 顶栏 ============ */
.bar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 16px;
  padding: max(10px, env(safe-area-inset-top)) 16px 10px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(1.2); backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background-color .5s ease;
}
.bar.scrolled { border-bottom-color: var(--rule); }
.mark { font-size: 17px; text-decoration: none; letter-spacing: .08em; }
.links { display: none; gap: 22px; margin-left: auto; font-size: 15px; }
.links a { text-decoration: none; color: var(--ink-2); transition: color .2s; }
.links a:hover { color: var(--rose); }
.ctrls { display: flex; gap: 6px; margin-left: auto; }
.links + .ctrls { margin-left: 8px; }
@media (min-width: 760px) { .links { display: flex; } .bar { padding-left: 32px; padding-right: 24px; } }
.ctrl {
  width: 36px; height: 36px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid var(--rule);
  transition: border-color .2s, background-color .2s;
}
.ctrl:hover { border-color: var(--gold-2); }
.ctrl svg { width: 17px; height: 17px; fill: none; stroke: var(--ink-2); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
[data-theme="light"] .i-moon, [data-theme="dark"] .i-sun { display: none; }
#music-btn[aria-pressed="true"] { border-color: var(--rose); background: var(--rose-2); }
#music-btn[aria-pressed="true"] svg { stroke: var(--rose); animation: sway 2.4s ease-in-out infinite; }
@keyframes sway { 0%,100% { transform: rotate(-6deg); } 50% { transform: rotate(6deg); } }

/* ============ 首屏 ============ */
.hero {
  max-width: 1080px; margin: 0 auto;
  padding: 7vh 20px 56px;
  display: grid; gap: 44px; align-items: center;
  min-height: calc(100svh - 58px);
}
@media (min-width: 860px) {
  .hero { grid-template-columns: 1.15fr .85fr; gap: 64px; padding: 4vh 40px 64px; }
}
.hero-text { text-align: center; }
@media (min-width: 860px) { .hero-text { text-align: left; } }

.kicker { margin: 0 0 28px; font-size: 16px; color: var(--ink-2); letter-spacing: .12em; }
.kicker i { font-family: var(--num); font-style: italic; color: var(--rose); margin: 0 .55em; font-size: 1.25em; letter-spacing: 0; }
.pre { margin: 0; font-size: 18px; color: var(--ink-2); letter-spacing: .3em; }
.big {
  margin: -4px 0 8px; font-weight: 400; line-height: 1;
  display: flex; align-items: baseline; justify-content: center; gap: 10px;
}
@media (min-width: 860px) { .big { justify-content: flex-start; margin-left: -6px; } }
.big .n {
  font-family: var(--num); font-weight: 300;
  font-size: clamp(132px, 40vw, 280px); letter-spacing: -.03em;
  color: var(--ink); font-variant-numeric: lining-nums;
}
.big .w { font-size: clamp(26px, 6vw, 34px); color: var(--rose); transform: translateY(-.2em); }
.ticker {
  margin: 8px 0 0; font-size: 15px; color: var(--ink-2); letter-spacing: .06em;
}
.ticker .t-lead { display: block; font-size: 14px; color: var(--ink-3); letter-spacing: .12em; }
.ticker .t-count { display: block; margin-top: 2px; }
.ticker b {
  font-family: var(--num); font-weight: 500; font-size: 1.35em; color: var(--ink);
  font-variant-numeric: tabular-nums lining-nums; padding: 0 1px;
  display: inline-block; min-width: 1.1em; text-align: center;
}
.since {
  margin: 30px auto 0; max-width: 23em; font-size: 16px; color: var(--ink-3); line-height: 2;
  padding-top: 22px; border-top: 1px solid var(--rule);
  text-wrap: balance;
}
@media (min-width: 860px) { .since { margin-left: 0; } }
.since b { font-family: var(--num); font-weight: 500; font-size: 1.3em; color: var(--rose); }

/* 冲印照片 */
.print {
  margin: 0; background: var(--mat); padding: 10px 10px 0;
  box-shadow: var(--shadow); border-radius: 2px;
  transition: transform .5s cubic-bezier(.2,.7,.2,1);
}
.print img { width: 100%; height: auto; background: var(--paper-2); }
.print figcaption {
  font-size: 14px; color: #6b6157; text-align: center; padding: 12px 6px 14px; line-height: 1.5;
}
.print figcaption small { display: block; font-family: var(--num); font-style: italic; font-size: 13px; color: #a09485; letter-spacing: .08em; }
.hero-print { width: min(76vw, 420px); margin: 0 auto; transform: rotate(2.2deg); }
.hero-print:hover { transform: rotate(0deg) translateY(-4px); }
.hero-print button { display: block; width: 100%; }

/* ============ 区块 ============ */
.sec { max-width: 1080px; margin: 0 auto; padding: 88px 20px 8px; }
@media (min-width: 860px) { .sec { padding: 120px 40px 8px; } }
.sec-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.sec-head h2 {
  margin: 0; font-weight: 400; font-size: clamp(34px, 8vw, 44px); letter-spacing: .14em;
  line-height: 1.3; position: relative; display: inline-block; padding: 0 .1em;
}
.sec-head h2::after {
  content: ""; display: block; width: 28px; height: 2px; background: var(--rose); margin: 14px auto 0; border-radius: 2px;
}
.sec-head .lede { margin: 18px auto 0; color: var(--ink-2); font-size: 16px; max-width: 30em; text-wrap: balance; }
.sec-head .lede b { font-family: var(--num); font-weight: 500; color: var(--rose); font-size: 1.5em; padding: 0 .1em; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s ease, transform .9s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ============ 年轮 ============ */
.rings-wrap { max-width: 560px; margin: 0 auto; position: relative; }
#rings-svg { width: 100%; height: auto; display: block; overflow: visible; }
#rings-svg .ring { fill: none; stroke: var(--gold-2); stroke-width: 1.2; }
#rings-svg .ring-m { fill: none; stroke: var(--rose); stroke-width: 2.4; stroke-linecap: round; }
#rings-svg .ring-future { fill: none; stroke: var(--rule); stroke-width: 1.2; stroke-dasharray: 2 5; }
#rings-svg .yr { font-family: var(--num); font-size: 12px; fill: var(--ink-3); text-anchor: middle; letter-spacing: .04em; }
#rings-svg .yr-bg { fill: var(--paper); transition: fill .5s; }
#rings-svg .core { fill: var(--rose); }
#rings-svg .core-ring { fill: none; stroke: var(--rose); stroke-width: 1; opacity: .4; }
#rings-svg .core-t { font-family: var(--kai); font-size: 13px; fill: var(--ink-2); text-anchor: middle; }
#rings-svg .dot { cursor: pointer; }
#rings-svg .dot circle.d { fill: var(--paper); stroke: var(--ink); stroke-width: 1.6; transition: r .2s, fill .2s; }
#rings-svg .dot.wed circle.d { fill: var(--rose); stroke: var(--rose); }
#rings-svg .dot circle.hit { fill: transparent; }
#rings-svg .dot:hover circle.d, #rings-svg .dot:focus circle.d, #rings-svg .dot.on circle.d { fill: var(--ink); }
#rings-svg .dot.wed:hover circle.d, #rings-svg .dot.wed.on circle.d { fill: var(--rose); r: 8; }
#rings-svg .dot:focus { outline: none; }
#rings-svg .now circle { fill: var(--rose); }
#rings-svg .now .pulse { fill: none; stroke: var(--rose); stroke-width: 1.5; animation: ping 2.6s ease-out infinite; transform-box: fill-box; transform-origin: center; }
#rings-svg .now-t { font-size: 13px; fill: var(--rose); font-family: var(--kai); }
#rings-svg .tick { stroke: var(--ink-3); stroke-width: 1; opacity: .5; }
@keyframes ping { 0% { transform: scale(.6); opacity: .9; } 100% { transform: scale(2.6); opacity: 0; } }
.ring-tip { text-align: center; color: var(--ink-3); font-size: 15px; min-height: 1.9em; margin: 10px 0 0; transition: color .2s; }
.ring-tip.on { color: var(--ink); }
.ring-tip.on em { font-style: normal; color: var(--rose); }
.legend { list-style: none; padding: 0; margin: 18px auto 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 22px; font-family: var(--sans); font-size: 12px; color: var(--ink-3); }
.legend li { display: flex; align-items: center; gap: 7px; }
.legend i { display: inline-block; }
.lg-gold { width: 18px; height: 0; border-top: 1.5px solid var(--gold); }
.lg-rose { width: 18px; height: 0; border-top: 2.5px solid var(--rose); border-radius: 2px; }
.lg-dot { width: 9px; height: 9px; border-radius: 50%; border: 1.6px solid var(--ink); }
.lg-now { width: 8px; height: 8px; border-radius: 50%; background: var(--rose); box-shadow: 0 0 0 3px var(--rose-2); }

/* ============ 纪念日 ============ */
.toc { list-style: none; padding: 0; margin: 0 auto; max-width: 620px; }
.toc li {
  display: grid; grid-template-columns: auto 1fr auto; align-items: baseline; gap: 10px;
  padding: 13px 4px; position: relative;
}
.toc li + li { border-top: 1px solid var(--rule); }
.toc .name { font-size: 17px; }
.toc .name em { font-style: normal; color: var(--gold); font-size: 15px; margin-left: .5em; }
.toc .leader { border-bottom: 1.5px dotted var(--ink-3); opacity: .45; transform: translateY(-.35em); min-width: 12px; }
.toc .date { font-family: var(--num); font-size: 17px; color: var(--ink-2); font-variant-numeric: tabular-nums lining-nums; letter-spacing: .03em; }
.toc .state { grid-column: 1 / -1; font-family: var(--sans); font-size: 12px; color: var(--ink-3); margin-top: -4px; }
.toc li.done .name, .toc li.done .date { color: var(--ink-3); }
.toc li.done .state::before { content: "✓ "; color: var(--gold); }
.toc li.next { background: var(--rose-2); border-radius: 10px; padding: 16px 14px; border-top-color: transparent; }
.toc li.next + li { border-top-color: transparent; }
.toc li.next .name { color: var(--rose); }
.toc li.next .state { color: var(--rose); }

/* ============ 故事 ============ */
.chapter {
  display: grid; gap: 6px 40px; padding: 48px 0;
  border-top: 1px solid var(--rule);
  max-width: 920px; margin: 0 auto;
}
.chapter:first-child { border-top: 0; padding-top: 8px; }
@media (min-width: 760px) { .chapter { grid-template-columns: 150px 1fr; } }
.ch-side { display: flex; align-items: baseline; gap: 14px; }
@media (min-width: 760px) { .ch-side { flex-direction: column; gap: 4px; position: sticky; top: 84px; align-self: start; } }
.ch-no { font-size: 46px; line-height: 1.1; color: var(--gold); }
.ch-date { font-family: var(--num); font-size: 18px; font-style: italic; color: var(--ink-3); letter-spacing: .06em; }
.chapter h3 { margin: 0; font-weight: 400; font-size: clamp(26px, 6vw, 32px); letter-spacing: .06em; line-height: 1.4; }
.ch-place { margin: 6px 0 0; font-family: var(--sans); font-size: 13px; color: var(--ink-3); letter-spacing: .06em; display: flex; align-items: center; gap: 5px; }
.ch-place svg { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.ch-text { margin: 18px 0 0; font-size: 18px; line-height: 2.05; color: var(--ink-2); white-space: pre-line; max-width: 28em; text-wrap: pretty; }
.ch-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; margin-top: 22px; }
.ch-tags { display: flex; gap: 12px; font-family: var(--sans); font-size: 12px; color: var(--ink-3); }
.ch-link {
  color: var(--rose); text-decoration: none; font-size: 16px;
  background: linear-gradient(currentColor, currentColor) 0 100% / 100% 1px no-repeat;
  padding-bottom: 2px; transition: background-size .3s;
}
.ch-link:hover { background-size: 0 1px; background-position: 100% 100%; }

.prints { display: grid; gap: 18px; margin-top: 28px; grid-template-columns: repeat(2, 1fr); align-items: start; }
.prints.n1 { grid-template-columns: minmax(0, 520px); }
.prints.n3 > :first-child { grid-column: 1 / -1; }
.prints .print { padding: 8px 8px 0; }
.prints .print:nth-child(odd) { transform: rotate(-1.2deg); }
.prints .print:nth-child(even) { transform: rotate(1.4deg) translateY(10px); }
.prints .print:hover { transform: rotate(0) translateY(-3px); }
.prints .print button { display: block; width: 100%; }
.prints .print figcaption { font-size: 13px; padding: 8px 4px 10px; }

.chapter.tbc { text-align: center; display: block; border-top-style: dashed; }
.chapter.tbc h3 { color: var(--ink-3); font-size: 24px; }
.chapter.tbc p { color: var(--ink-3); margin: 6px 0 0; font-size: 16px; }
.blank-print {
  width: 150px; height: 120px; margin: 26px auto 0; border: 1.5px dashed var(--ink-3); opacity: .5;
  display: grid; place-items: center; transform: rotate(-2deg); border-radius: 2px;
  font-family: var(--num); font-size: 34px; color: var(--ink-3);
}

/* ============ 相册 ============ */
.chips { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px; margin: -18px 0 30px; }
.chips:empty { display: none; }
.chips button { font-family: var(--num); font-size: 17px; padding: 2px 14px; border-radius: 999px; color: var(--ink-3); }
.chips button[aria-selected="true"] { color: var(--paper); background: var(--ink); }
.album { columns: 2 150px; column-gap: 16px; max-width: 980px; margin: 0 auto; }
@media (min-width: 760px) { .album { columns: 3 220px; column-gap: 26px; } }
.album .print { break-inside: avoid; margin: 0 0 18px; padding: 7px 7px 0; display: block; width: 100%; text-align: left; }
@media (min-width: 760px) { .album .print { margin-bottom: 28px; } }
.album .print:nth-child(3n+1) { transform: rotate(-.8deg); }
.album .print:nth-child(3n+2) { transform: rotate(.9deg); }
.album .print:hover { transform: rotate(0) translateY(-3px); }
.album .print figcaption { font-size: 13px; padding: 8px 4px 10px; }
.empty { text-align: center; color: var(--ink-3); }

/* ============ 页脚 ============ */
.foot { text-align: center; padding: 120px 20px max(56px, env(safe-area-inset-bottom)); }
.vow { margin: 0; font-size: clamp(24px, 6.4vw, 34px); letter-spacing: .2em; line-height: 1.8; }
.vow span { display: inline-block; }
.sig { margin: 22px 0 0; font-family: var(--num); font-style: italic; font-size: 15px; color: var(--ink-3); letter-spacing: .1em; }

/* ============ 大图 ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 200; background: rgba(14, 12, 10, .95);
  display: flex; align-items: center; justify-content: center; padding: 60px 14px;
  animation: fade .25s ease;
}
.lightbox[hidden] { display: none; }
@keyframes fade { from { opacity: 0; } }
.lightbox figure { margin: 0; display: flex; flex-direction: column; align-items: center; max-width: 100%; }
.lightbox img { max-width: 100%; max-height: calc(100svh - 170px); object-fit: contain; border: 8px solid #f4efe6; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.lightbox figcaption { color: #ece4d6; text-align: center; margin-top: 16px; font-family: var(--kai); }
.lightbox figcaption b { font-weight: 400; font-size: 17px; display: block; }
.lightbox figcaption span { font-family: var(--sans); font-size: 12px; color: #948a7d; }
.lb-close, .lb-nav { position: absolute; display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: rgba(255,255,255,.08); }
.lb-close svg, .lb-nav svg { width: 20px; height: 20px; fill: none; stroke: #ece4d6; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.lb-close { top: max(14px, env(safe-area-inset-top)); right: 14px; }
.lb-nav { top: 50%; margin-top: -22px; }
.lb-prev { left: 14px; } .lb-next { right: 14px; }
@media (max-width: 600px) { .lb-nav { display: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}