/* ========== 基础 ========== */
:root{
  --cream:#FDF8F3;
  --paper:#FFFCF9;
  --ink:#3B3330;
  --ink-soft:#8A7C75;
  --line:#E8DCD2;
  --rose:#C4757A;
  --rose-deep:#A8525B;
  --gold:#C3A06A;
  --shadow:0 10px 30px rgba(122,90,80,.10);
  --shadow-lg:0 24px 60px rgba(122,90,80,.18);
  --serif:'Songti SC','STSong','Source Han Serif SC','Noto Serif CJK SC','SimSun',serif;
  --sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--cream);
  line-height:1.9;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
.wrap{max-width:960px;margin:0 auto;padding:0 24px}

/* ========== 阅读进度 ========== */
.progress{
  position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--rose),var(--gold));
  z-index:100;transition:width .1s linear;
}

/* ========== 封面 ========== */
.hero{
  position:relative;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:80px 24px 120px;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(60% 50% at 50% 30%, #FFF3E6 0%, rgba(255,243,230,0) 70%),
    radial-gradient(40% 40% at 80% 80%, #FBE7E4 0%, rgba(251,231,228,0) 70%),
    radial-gradient(40% 40% at 15% 85%, #F3EBE0 0%, rgba(243,235,224,0) 70%),
    var(--cream);
  z-index:-2;
}
.hero-glow{
  position:absolute;top:-20%;left:50%;transform:translateX(-50%);
  width:120vw;height:120vw;max-width:1400px;max-height:1400px;
  background:radial-gradient(circle,rgba(196,117,122,.10) 0%,rgba(196,117,122,0) 60%);
  animation:breathe 9s ease-in-out infinite;z-index:-1;pointer-events:none;
}
@keyframes breathe{0%,100%{opacity:.5;transform:translateX(-50%) scale(1)}50%{opacity:1;transform:translateX(-50%) scale(1.06)}}

.hero-inner{position:relative;z-index:2;max-width:720px}
.hero-sub{
  font-size:13px;letter-spacing:.5em;text-indent:.5em;color:var(--rose);
  margin-bottom:28px;font-weight:500;
}
.hero-title{
  font-family:var(--serif);
  font-size:clamp(34px,7.5vw,60px);
  font-weight:600;line-height:1.4;letter-spacing:.06em;
  margin-bottom:20px;
}
.hero-title .amp{
  color:var(--rose);font-size:.6em;margin:0 .22em;
  display:inline-block;transform:translateY(-.08em);
}
.hero-title .nm{display:inline-block;white-space:nowrap}
.hero-quote{
  font-family:var(--serif);color:var(--ink-soft);
  font-size:clamp(14px,2.6vw,17px);letter-spacing:.16em;margin-bottom:44px;
}

/* 计数器 */
.counter{
  display:flex;align-items:flex-end;justify-content:center;gap:6px;
  margin-bottom:26px;flex-wrap:wrap;
}
.counter-item{
  min-width:74px;padding:14px 10px 10px;border-radius:12px;
  background:rgba(255,255,255,.72);border:1px solid var(--line);
  box-shadow:0 6px 18px rgba(160,120,110,.08);backdrop-filter:blur(6px);
}
.counter-item b{
  display:block;font-family:var(--serif);font-size:clamp(24px,5vw,34px);
  font-weight:600;color:var(--rose-deep);line-height:1.1;
  font-variant-numeric:tabular-nums;
}
.counter-item small{display:block;font-size:11px;color:var(--ink-soft);letter-spacing:.2em;margin-top:4px}
.counter-sep{font-family:var(--serif);color:var(--line);font-size:22px;padding-bottom:22px}

.hero-since{font-size:13px;color:var(--ink-soft);letter-spacing:.14em}

/* 下滑提示 */
.scroll-hint{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:6px;
  color:var(--ink-soft);font-size:11px;letter-spacing:.24em;z-index:3;
  animation:bob 2.2s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translate(-50%,0);opacity:.55}50%{transform:translate(-50%,7px);opacity:1}}

/* 花瓣 */
.petals{position:absolute;inset:0;pointer-events:none;z-index:1;overflow:hidden}
.petal{
  position:absolute;top:-6vh;
  width:9px;height:9px;border-radius:60% 40% 55% 45%;
  background:linear-gradient(150deg,#F4C9C6,#E4A6A6);
  opacity:0;animation:fall linear infinite;
}
@keyframes fall{
  0%{transform:translateY(0) rotate(0deg);opacity:0}
  10%{opacity:.75}
  90%{opacity:.5}
  100%{transform:translateY(108vh) translateX(60px) rotate(520deg);opacity:0}
}

/* ========== 区块 ========== */
.section{padding:100px 0}
.sec-title{
  font-family:var(--serif);font-size:clamp(22px,4.4vw,30px);font-weight:600;
  text-align:center;letter-spacing:.16em;margin-bottom:10px;
}
.sec-desc{text-align:center;color:var(--ink-soft);font-size:14px;letter-spacing:.1em;margin-bottom:56px}

/* ========== 时间轴 ========== */
.timeline{position:relative;padding:10px 0}
.timeline::before{
  content:'';position:absolute;left:50%;top:0;bottom:0;width:1px;
  background:linear-gradient(180deg,transparent,var(--line) 8%,var(--line) 92%,transparent);
  transform:translateX(-.5px);
}
.tl-item{position:relative;width:50%;padding:0 46px 56px 0}
.tl-item:nth-child(even){margin-left:50%;padding:0 0 56px 46px}
.tl-item::after{ /* 节点圆点 */
  content:'';position:absolute;top:14px;width:11px;height:11px;border-radius:50%;
  background:var(--paper);border:2px solid var(--rose);
  box-shadow:0 0 0 5px var(--cream);
}
.tl-item:nth-child(odd)::after{right:-5.5px}
.tl-item:nth-child(even)::after{left:-5.5px}

.tl-card{
  background:var(--paper);border:1px solid var(--line);border-radius:16px;
  padding:22px 24px;box-shadow:var(--shadow);
  transition:transform .4s cubic-bezier(.2,.7,.3,1),box-shadow .4s;
}
.tl-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.tl-date{
  font-family:var(--serif);font-size:13px;color:var(--rose);
  letter-spacing:.14em;margin-bottom:8px;
}
.tl-title{font-family:var(--serif);font-size:19px;font-weight:600;margin-bottom:8px;letter-spacing:.04em}
.tl-text{font-size:14.5px;color:var(--ink-soft);line-height:1.95}
.tl-photo{
  margin-top:16px;border-radius:12px;overflow:hidden;cursor:zoom-in;
  background:#F2EAE3;position:relative;
}
.tl-photo img{
  width:100%;transition:transform .6s cubic-bezier(.2,.7,.3,1);
  aspect-ratio:4/3;object-fit:cover;
}
.tl-photo:hover img{transform:scale(1.045)}

/* ========== 照片墙 ========== */
.gallery{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));
  gap:16px;
}
.g-item{
  border-radius:14px;overflow:hidden;cursor:zoom-in;background:#F2EAE3;
  box-shadow:var(--shadow);position:relative;
}
.g-item img{width:100%;aspect-ratio:1/1;object-fit:cover;transition:transform .6s cubic-bezier(.2,.7,.3,1)}
.g-item:hover img{transform:scale(1.07)}
.g-item::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(to top,rgba(60,40,36,.28),transparent 45%);
  opacity:0;transition:opacity .35s;
}
.g-item:hover::after{opacity:1}

/* 月份小标题：占满整行，把照片墙按月分段 */
.g-month{
  grid-column:1/-1;
  font-family:var(--serif);
  font-size:13.5px;
  color:var(--rose);
  letter-spacing:.22em;
  margin:30px 0 2px;
  display:flex;align-items:center;gap:14px;
}
.g-month::after{content:'';flex:1;height:1px;background:var(--line)}
.g-month:first-child{margin-top:0}

/* ========== 一封信 ========== */
.letter-section{padding-bottom:120px}
.letter{
  max-width:640px;margin:0 auto;background:var(--paper);
  border:1px solid var(--line);border-radius:18px;
  padding:52px clamp(26px,6vw,54px);box-shadow:var(--shadow);
  background-image:repeating-linear-gradient(transparent,transparent 33px,rgba(196,117,122,.07) 34px);
  font-family:var(--serif);
}
.letter p{font-size:16px;line-height:2.2;margin-bottom:18px;color:var(--ink)}
.letter p:first-child{color:var(--rose-deep);font-size:17px;margin-bottom:26px}
.letter-sign{
  text-align:right;color:var(--ink-soft);font-size:14px;
  margin-top:30px;letter-spacing:.1em;
}

/* ========== 页脚 ========== */
.footer{
  padding:70px 24px 90px;text-align:center;
  background:linear-gradient(180deg,transparent,#F7EFE7);
  color:var(--ink-soft);font-size:13.5px;letter-spacing:.1em;
}
.footer-heart{color:var(--rose);font-size:22px;margin-bottom:14px;animation:beat 1.8s ease-in-out infinite}
@keyframes beat{0%,100%{transform:scale(1)}12%{transform:scale(1.22)}24%{transform:scale(1)}36%{transform:scale(1.12)}}
.footer-sign{margin-top:20px;font-family:var(--serif);letter-spacing:.24em;color:var(--rose)}

/* ========== 音乐按钮 ========== */
.music-btn{
  position:fixed;right:20px;bottom:20px;z-index:90;
  width:48px;height:48px;border-radius:50%;
  background:rgba(255,255,255,.9);border:1px solid var(--line);
  color:var(--rose);box-shadow:var(--shadow);
  display:none;align-items:center;justify-content:center;
  backdrop-filter:blur(8px);transition:transform .3s,color .3s;
}
.music-btn.show{display:flex}
.music-btn:hover{transform:scale(1.08);color:var(--rose-deep)}
.music-btn.playing .music-ring{
  position:absolute;inset:-5px;border-radius:50%;
  border:1px solid var(--rose);opacity:.45;animation:ring 2s linear infinite;
}
@keyframes ring{0%{transform:scale(.9);opacity:.6}100%{transform:scale(1.35);opacity:0}}
.music-btn.playing .music-icon{animation:spin 4s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ========== Lightbox ========== */
.lightbox{
  position:fixed;inset:0;z-index:200;background:rgba(30,22,20,.94);
  display:none;align-items:center;justify-content:center;padding:56px 20px;
  opacity:0;transition:opacity .3s;
}
.lightbox.show{display:flex;opacity:1}
.lightbox img{
  max-width:100%;max-height:calc(100vh - 150px);
  object-fit:contain;border-radius:8px;box-shadow:0 30px 80px rgba(0,0,0,.5);
}
.lb-close{
  position:absolute;top:18px;right:24px;font-size:38px;line-height:1;
  color:#fff;opacity:.7;transition:opacity .2s;
}
.lb-close:hover{opacity:1}
.lb-nav{
  position:absolute;top:50%;transform:translateY(-50%);
  font-size:44px;line-height:1;color:#fff;opacity:.55;padding:20px;
  transition:opacity .2s;
}
.lb-nav:hover{opacity:1}
.lb-prev{left:8px}
.lb-next{right:8px}
.lb-cap{
  position:absolute;bottom:24px;left:0;right:0;text-align:center;
  color:rgba(255,255,255,.8);font-size:13.5px;letter-spacing:.1em;padding:0 30px;
}

/* ========== 滚动出现动画 ========== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s ease,transform .9s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ========== 移动端 ========== */
@media (max-width:720px){
  .section{padding:70px 0}
  .timeline::before{left:9px}
  .tl-item,.tl-item:nth-child(even){width:100%;margin-left:0;padding:0 0 40px 34px}
  .tl-item::after,.tl-item:nth-child(even)::after{left:3.5px;right:auto}
  .counter-item{min-width:62px;padding:11px 6px 8px}
  .counter-sep{padding-bottom:18px;font-size:18px}
  .gallery{grid-template-columns:repeat(2,1fr);gap:10px}
  .letter{padding:38px 24px}
  .music-btn{right:14px;bottom:14px;width:44px;height:44px}
  .lb-nav{font-size:34px;padding:12px}
  .hero{padding:70px 20px 110px}
}

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