/* ============================================================
   廿载归航 · 经彩依旧 — 南邮经管2006届二十周年返校聚会
   ============================================================ */

:root{
  --ink:#0B1626;
  --ink-2:#13243A;
  --ink-3:#1C3251;
  --gold:#C9A86A;
  --gold-light:#E6CE97;
  --gold-deep:#9A7B3F;
  --cream:#F6F0E2;
  --paper:#FBF7EE;
  --paper-2:#F1E9D6;
  --crimson:#9C2F2F;
  --text:#2A2218;
  --text-light:rgba(246,240,226,.78);
  --text-muted:rgba(246,240,226,.56);
  --line:rgba(201,168,106,.28);
  --line-soft:rgba(42,34,24,.12);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --brush:"Ma Shan Zheng","STKaiti","KaiTi",serif;
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--text);
  line-height:1.75;
  font-weight:300;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul{list-style:none}

::selection{background:var(--gold);color:var(--ink)}

/* 全局胶片颗粒 */
body::before{
  content:"";
  position:fixed;inset:0;
  pointer-events:none;
  z-index:9999;
  opacity:.04;
  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='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ============================================================
   通用区块
   ============================================================ */
.section{
  position:relative;
  padding:clamp(72px,11vw,140px) 0;
}
.section__head{
  text-align:center;
  margin-bottom:clamp(44px,6vw,72px);
}
.section__label{
  display:inline-block;
  font-size:13px;
  letter-spacing:.4em;
  color:var(--gold-deep);
  text-transform:uppercase;
  margin-bottom:18px;
  position:relative;
  padding:0 4px;
}
.section__title{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(28px,4.4vw,46px);
  line-height:1.25;
  color:var(--ink);
  letter-spacing:.04em;
}
.section__rule{
  display:block;
  width:64px;height:2px;
  margin:26px auto 0;
  background:linear-gradient(90deg,transparent,var(--gold),transparent);
  position:relative;
}
.section__rule::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  width:7px;height:7px;
  background:var(--gold);
  transform:translate(-50%,-50%) rotate(45deg);
}
.section__head--light .section__title{color:var(--cream)}
.section__head--light .section__label{color:var(--gold-light)}

/* ============================================================
   导航
   ============================================================ */
.nav{
  position:fixed;top:0;left:0;right:0;
  z-index:1000;
  transition:background .4s var(--ease),box-shadow .4s var(--ease),padding .4s var(--ease);
  padding:18px 0;
}
.nav.is-scrolled{
  background:rgba(11,22,38,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 0 rgba(201,168,106,.18);
  padding:12px 0;
}
.nav__inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 28px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.nav__brand{display:flex;align-items:center;gap:12px}
.nav__seal{
  width:38px;height:38px;
  display:grid;place-items:center;
  font-family:var(--brush);
  font-size:22px;
  color:var(--cream);
  background:linear-gradient(145deg,var(--gold),var(--gold-deep));
  border-radius:8px;
  box-shadow:0 4px 14px rgba(201,168,106,.35);
}
.nav__brand-text{display:flex;flex-direction:column;line-height:1.1}
.nav__brand-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:17px;
  color:var(--cream);
  letter-spacing:.12em;
}
.nav__brand-sub{
  font-size:10px;
  letter-spacing:.28em;
  color:var(--gold-light);
  margin-top:2px;
}
.nav__menu{display:flex;align-items:center;gap:6px}
.nav__link{
  font-size:14px;
  color:var(--text-light);
  padding:8px 14px;
  border-radius:6px;
  letter-spacing:.08em;
  transition:color .3s,background .3s;
  position:relative;
}
.nav__link:hover{color:var(--cream)}
.nav__link--cta{
  background:linear-gradient(145deg,var(--gold),var(--gold-deep));
  color:var(--ink);
  font-weight:500;
  margin-left:8px;
  box-shadow:0 4px 14px rgba(201,168,106,.3);
}
.nav__link--cta:hover{color:var(--ink);transform:translateY(-1px)}
.nav__toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  padding:8px;
}
.nav__toggle span{
  width:24px;height:2px;
  background:var(--cream);
  transition:transform .35s var(--ease),opacity .3s;
}

/* ============================================================
   Hero 首屏
   ============================================================ */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  overflow:hidden;
  color:var(--cream);
  padding:120px 20px 80px;
}
.hero__bg{position:absolute;inset:0;z-index:0}
.hero__bg{
  background:
    radial-gradient(120% 80% at 50% 118%, rgba(201,168,106,.55) 0%, rgba(201,168,106,.12) 22%, transparent 42%),
    radial-gradient(90% 60% at 50% 100%, rgba(230,206,151,.4) 0%, transparent 55%),
    linear-gradient(180deg,#050B16 0%,#0B1626 38%,#1A2E4A 72%,#3A3358 92%,#6B4A3A 100%);
}
.hero__glow{
  position:absolute;
  border-radius:50%;
  filter:blur(60px);
  opacity:.6;
}
.hero__glow--sun{
  width:520px;height:520px;
  left:50%;bottom:-120px;
  transform:translateX(-50%);
  background:radial-gradient(circle,rgba(255,196,120,.85) 0%,rgba(230,150,70,.35) 38%,transparent 70%);
  animation:sunPulse 9s ease-in-out infinite;
}
.hero__glow--amber{
  width:700px;height:380px;
  left:50%;bottom:-180px;
  transform:translateX(-50%);
  background:radial-gradient(ellipse,rgba(201,168,106,.4),transparent 70%);
}
@keyframes sunPulse{
  0%,100%{opacity:.55;transform:translateX(-50%) scale(1)}
  50%{opacity:.8;transform:translateX(-50%) scale(1.06)}
}
.hero__grain{
  position:absolute;inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity:.08;
  mix-blend-mode:overlay;
}
.hero__veil{
  position:absolute;inset:0;
  background:radial-gradient(110% 70% at 50% 40%,transparent 30%,rgba(5,11,22,.55) 100%);
}
.hero__watermark{
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%,-54%);
  font-family:var(--brush);
  font-size:clamp(280px,52vw,620px);
  color:rgba(201,168,106,.06);
  line-height:.8;
  z-index:1;
  pointer-events:none;
  user-select:none;
}
.hero__content{position:relative;z-index:3;max-width:880px;padding-bottom:80px}
.hero__eyebrow{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:18px;
  font-size:13px;
  letter-spacing:.34em;
  color:var(--gold-light);
  margin-bottom:36px;
  font-weight:400;
}
.hero__eyebrow-line{
  display:block;width:48px;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold));
}
.hero__eyebrow-line:last-child{background:linear-gradient(90deg,var(--gold),transparent)}

.hero__title{
  font-family:var(--serif);
  font-weight:900;
  font-size:clamp(58px,11vw,138px);
  line-height:1.02;
  letter-spacing:.08em;
  margin-bottom:24px;
}
.reveal-line{display:block;overflow:hidden}
.reveal-line{
  background:linear-gradient(180deg,#FBF3E0 0%,#E6CE97 60%,#C9A86A 100%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  animation:rise 1.1s var(--ease-out) both;
}
.reveal-line--gold{animation-delay:.18s}
@keyframes rise{
  from{transform:translateY(110%);opacity:0}
  to{transform:translateY(0);opacity:1}
}
.hero__subtitle{
  font-family:var(--serif);
  font-weight:500;
  font-size:clamp(15px,2.2vw,20px);
  letter-spacing:.32em;
  color:var(--text-light);
  margin-bottom:44px;
}

.hero__meta{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:clamp(16px,4vw,40px);
  margin-bottom:48px;
  flex-wrap:wrap;
}
.hero__meta-item{display:flex;flex-direction:column;align-items:center;gap:6px}
.hero__meta-label{
  font-size:11px;letter-spacing:.4em;color:var(--text-muted);
}
.hero__meta-value{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(15px,2vw,18px);
  color:var(--cream);letter-spacing:.06em;
}
.hero__meta-divider{
  width:1px;height:36px;
  background:linear-gradient(180deg,transparent,var(--gold),transparent);
}

/* 倒计时 */
.countdown{
  display:flex;
  align-items:flex-start;
  justify-content:center;
  gap:clamp(8px,2vw,18px);
  margin-bottom:12px;
}
.countdown__item{
  display:flex;flex-direction:column;align-items:center;
  min-width:clamp(58px,11vw,92px);
  padding:14px 6px 12px;
  background:rgba(246,240,226,.05);
  border:1px solid rgba(201,168,106,.22);
  border-radius:10px;
  backdrop-filter:blur(4px);
}
.countdown__num{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(26px,5vw,40px);
  line-height:1;
  color:var(--gold-light);
  font-variant-numeric:tabular-nums;
}
.countdown__unit{
  font-size:11px;letter-spacing:.3em;color:var(--text-muted);margin-top:8px;
}
.countdown__sep{display:none}
.countdown__caption{
  font-size:12px;letter-spacing:.3em;color:var(--text-muted);
  margin-bottom:0;
}

.hero__scroll{
  position:absolute;
  bottom:32px;left:50%;
  transform:translateX(-50%);
  z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  color:var(--gold-light);
  font-size:11px;letter-spacing:.4em;
}
.hero__scroll-line{
  width:1px;height:46px;
  background:linear-gradient(180deg,var(--gold),transparent);
  position:relative;
  overflow:hidden;
}
.hero__scroll-line::after{
  content:"";
  position:absolute;top:0;left:0;
  width:100%;height:50%;
  background:var(--gold-light);
  animation:scrollDot 2s var(--ease) infinite;
}
@keyframes scrollDot{
  0%{transform:translateY(-100%)}
  100%{transform:translateY(200%)}
}

/* ============================================================
   序 · 邀请信
   ============================================================ */
.letter{
  background:var(--paper);
  position:relative;
}
.letter::before{
  content:"";
  position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--line),transparent);
}
.letter__body{
  max-width:760px;
  margin:0 auto;
  background:
    linear-gradient(180deg,var(--paper),#FFFDF7);
  padding:clamp(40px,6vw,72px) clamp(28px,5vw,64px);
  border-radius:6px;
  box-shadow:0 30px 80px -40px rgba(11,22,38,.25),0 0 0 1px var(--line-soft);
  position:relative;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(16px,2vw,18px);
  line-height:2.1;
  color:#3A2F20;
  letter-spacing:.02em;
}
.letter__body::before,
.letter__body::after{
  content:"";
  position:absolute;
  width:34px;height:34px;
  border:1px solid var(--gold);
  opacity:.5;
}
.letter__body::before{top:18px;left:18px;border-right:none;border-bottom:none}
.letter__body::after{bottom:18px;right:18px;border-left:none;border-top:none}
.letter__salutation{
  font-weight:600;
  margin-bottom:24px;
  color:var(--ink);
}
.letter__body p{margin-bottom:22px;text-indent:2em}
.letter__quote{
  position:relative;
  margin:34px 0;
  padding:24px 30px 24px 56px;
  border-left:2px solid var(--gold);
  background:linear-gradient(90deg,rgba(201,168,106,.08),transparent);
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(18px,2.4vw,22px);
  line-height:1.7;
  color:var(--ink);
  text-indent:0;
  font-style:italic;
}
.letter__quote-mark{
  position:absolute;
  left:18px;top:6px;
  font-family:var(--serif);
  font-size:48px;
  color:var(--gold);
  line-height:1;
  opacity:.6;
}
.letter__sign{
  margin-top:36px;
  text-align:right;
  text-indent:0;
  line-height:1.9;
}
.letter__sign-name{display:block;font-weight:600;color:var(--ink)}
.letter__sign-date{
  display:block;
  margin-top:4px;
  color:var(--gold-deep);
  font-size:.92em;
}

/* ============================================================
   概览
   ============================================================ */
.overview{background:var(--paper)}
.overview__grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.overview__card{
  position:relative;
  padding:38px 26px 34px;
  background:linear-gradient(180deg,#FFFDF7,var(--paper-2));
  border:1px solid var(--line-soft);
  border-radius:8px;
  text-align:center;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease),border-color .5s;
}
.overview__card:hover{
  transform:translateY(-6px);
  box-shadow:0 24px 50px -28px rgba(11,22,38,.3);
  border-color:var(--line);
}
.overview__index{
  position:absolute;top:18px;right:20px;
  font-family:var(--serif);
  font-size:14px;
  color:var(--gold);
  letter-spacing:.1em;
  opacity:.7;
}
.overview__label{
  display:block;
  font-size:11px;letter-spacing:.4em;
  color:var(--gold-deep);
  margin-bottom:14px;
}
.overview__value{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(18px,2vw,22px);
  color:var(--ink);
  line-height:1.4;
  margin-bottom:10px;
}
.overview__desc{
  font-size:13px;color:#6B5D49;letter-spacing:.04em;
}

/* ============================================================
   日程
   ============================================================ */
.schedule{
  background:linear-gradient(180deg,var(--paper-2),var(--paper));
}
.schedule__timeline{
  max-width:880px;margin:0 auto;
  display:flex;flex-direction:column;gap:24px;
}
.schedule__day{
  position:relative;
  padding:clamp(28px,4vw,44px);
  background:linear-gradient(180deg,#FFFDF7,#F7EFDE);
  border:1px solid var(--line-soft);
  border-radius:10px;
  border-left:3px solid var(--gold);
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.schedule__day:hover{
  transform:translateX(6px);
  box-shadow:0 22px 50px -30px rgba(11,22,38,.28);
}
.schedule__day-head{
  display:flex;align-items:center;gap:22px;
  margin-bottom:28px;
  padding-bottom:22px;
  border-bottom:1px dashed var(--line);
}
.schedule__day-chinese{
  flex:0 0 auto;
  width:62px;height:62px;
  display:grid;place-items:center;
  font-family:var(--brush);
  font-size:34px;
  color:var(--cream);
  background:linear-gradient(145deg,var(--gold),var(--gold-deep));
  border-radius:50%;
  box-shadow:0 8px 20px -6px rgba(201,168,106,.5);
}
.schedule__day-title{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(18px,2.4vw,24px);
  color:var(--ink);
  margin-bottom:4px;
}
.schedule__day-date{
  font-size:13px;letter-spacing:.16em;color:var(--gold-deep);
}
.schedule__list{display:flex;flex-direction:column;gap:18px}
.schedule__list li{
  display:grid;
  grid-template-columns:140px 1fr;
  gap:24px;
  align-items:start;
}
.schedule__time{
  font-family:var(--serif);
  font-weight:600;
  font-size:14px;
  color:var(--gold-deep);
  padding-top:2px;
  letter-spacing:.04em;
}
.schedule__item h4{
  font-family:var(--serif);
  font-weight:600;
  font-size:16px;
  color:var(--ink);
  margin-bottom:4px;
}
.schedule__item p{font-size:13.5px;color:#6B5D49}

/* ============================================================
   八〇后 · 我们的年代
   ============================================================ */
.generation{
  position:relative;
  color:var(--cream);
  overflow:hidden;
  isolation:isolate;
}
.generation__bg{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(80% 60% at 80% 20%,rgba(201,168,106,.18),transparent 60%),
    radial-gradient(70% 70% at 10% 90%,rgba(156,47,47,.16),transparent 60%),
    linear-gradient(160deg,#0B1626 0%,#13243A 45%,#0B1626 100%);
}
.generation__grain{
  position:absolute;inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity:.07;mix-blend-mode:overlay;
}
.generation__inner{position:relative}
.generation__intro{
  max-width:820px;margin:0 auto clamp(56px,7vw,84px);
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(16px,2.1vw,19px);
  line-height:2.1;
  color:var(--text-light);
  text-align:center;
  letter-spacing:.04em;
}

/* 年代时间轴 */
.generation__timeline{
  position:relative;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:16px;
  margin-bottom:clamp(48px,6vw,68px);
  max-width:1000px;
  margin-left:auto;margin-right:auto;
}
.gtl__track{
  position:absolute;
  top:22px;left:6%;right:6%;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--line) 12%,var(--line) 88%,transparent);
}
.gtl__track span{
  position:absolute;top:0;left:0;height:100%;width:0;
  background:linear-gradient(90deg,var(--gold-deep),var(--gold-light));
  transition:width 1.8s var(--ease-out);
}
.generation__timeline.is-in .gtl__track span{width:100%}
.gtl__item{
  position:relative;
  text-align:center;
  padding-top:54px;
}
.gtl__item::before{
  content:"";
  position:absolute;top:16px;left:50%;
  width:13px;height:13px;
  border-radius:50%;
  background:var(--ink);
  border:2px solid var(--gold);
  transform:translateX(-50%);
  transition:transform .4s,background .4s;
}
.gtl__item--now::before{
  background:var(--gold);
  box-shadow:0 0 0 5px rgba(201,168,106,.2);
}
.gtl__year{
  display:block;
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(18px,2.2vw,22px);
  color:var(--gold-light);
  margin-bottom:6px;
  letter-spacing:.04em;
}
.gtl__item--now .gtl__year{color:var(--cream)}
.gtl__text{
  font-size:13px;
  color:var(--text-muted);
  line-height:1.6;
  letter-spacing:.04em;
}
.gtl__item--now .gtl__text{color:var(--text-light)}

.generation__chips{
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:12px;margin-bottom:clamp(48px,6vw,68px);
  max-width:760px;margin-left:auto;margin-right:auto;
}
.chip{
  padding:9px 20px;
  font-size:13px;letter-spacing:.1em;
  color:var(--text-light);
  border:1px solid rgba(201,168,106,.3);
  border-radius:30px;
  background:rgba(246,240,226,.03);
  transition:all .4s var(--ease);
}
.chip:hover{
  color:var(--ink);
  background:var(--gold);
  border-color:var(--gold);
  transform:translateY(-2px);
}
.generation__closing{
  text-align:center;
  font-family:var(--brush);
  font-size:clamp(48px,9vw,96px);
  color:var(--gold-light);
  letter-spacing:.1em;
  line-height:1;
  text-shadow:0 4px 30px rgba(201,168,106,.3);
}

/* ============================================================
   资料征集
   ============================================================ */
.material{background:var(--paper)}
.material__grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:28px;
  max-width:880px;margin:0 auto;
}
.material__card{
  padding:clamp(36px,5vw,52px) clamp(28px,4vw,44px);
  background:linear-gradient(180deg,#FFFDF7,#F5ECD8);
  border:1px solid var(--line-soft);
  border-radius:10px;
  text-align:center;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.material__card:hover{
  transform:translateY(-6px);
  box-shadow:0 26px 56px -30px rgba(11,22,38,.3);
}
.material__icon{
  display:inline-grid;place-items:center;
  width:84px;height:84px;
  border-radius:50%;
  color:var(--gold-deep);
  background:rgba(201,168,106,.12);
  border:1px solid var(--line);
  margin-bottom:24px;
}
.material__title{
  font-family:var(--serif);
  font-weight:700;
  font-size:22px;
  color:var(--ink);
  margin-bottom:12px;
}
.material__desc{
  font-size:14.5px;color:#6B5D49;line-height:1.8;
}
.material__note{
  text-align:center;
  margin-top:36px;
  font-size:14px;color:#6B5D49;letter-spacing:.06em;
}
.material__note-link{color:var(--gold-deep);border-bottom:1px solid var(--line)}

/* ============================================================
   费用
   ============================================================ */
.cost{background:linear-gradient(180deg,var(--paper),var(--paper-2))}
.cost__panel{
  max-width:720px;margin:0 auto;
  padding:clamp(40px,5vw,60px);
  background:linear-gradient(160deg,#FFFDF7,#F3E9D2);
  border:1px solid var(--line);
  border-radius:12px;
  text-align:center;
  box-shadow:0 30px 70px -40px rgba(11,22,38,.25);
  position:relative;
}
.cost__head{margin-bottom:28px}
.cost__amount{
  font-family:var(--serif);
  font-weight:900;
  font-size:clamp(48px,8vw,76px);
  line-height:1;
  color:var(--ink);
  display:inline-flex;align-items:baseline;gap:4px;
}
.cost__currency{font-size:.42em;color:var(--gold-deep);font-weight:700}
.cost__per{font-size:.3em;color:var(--gold-deep);font-weight:600;margin-left:4px}
.cost__method{
  display:block;
  margin-top:14px;
  font-size:13px;letter-spacing:.4em;color:var(--gold-deep);
}
.cost__uses{
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
  margin-bottom:30px;padding-bottom:30px;
  border-bottom:1px dashed var(--line);
}
.cost__use{
  padding:7px 18px;
  font-size:13px;letter-spacing:.08em;
  color:var(--ink);
  background:rgba(201,168,106,.14);
  border-radius:30px;
}
.cost__notes{display:flex;flex-direction:column;gap:10px;text-align:left}
.cost__notes li{
  position:relative;
  padding-left:22px;
  font-size:14px;color:#5C4F3B;line-height:1.7;
}
.cost__notes li::before{
  content:"";
  position:absolute;left:0;top:11px;
  width:7px;height:7px;
  background:var(--gold);
  transform:rotate(45deg);
}

/* ============================================================
   联络
   ============================================================ */
.contacts{background:var(--paper-2)}
.contacts__block{
  max-width:880px;margin:0 auto 48px;
  padding:36px clamp(28px,4vw,48px);
  background:linear-gradient(180deg,#FFFDF7,#F7EFDE);
  border:1px solid var(--line-soft);
  border-radius:10px;
}
.contacts__block:last-child{margin-bottom:0}
.contacts__block-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:16px;
  color:var(--gold-deep);
  letter-spacing:.2em;
  margin-bottom:24px;
  text-align:center;
  position:relative;
}
.contacts__block-title::before,
.contacts__block-title::after{
  content:"";display:inline-block;
  width:36px;height:1px;vertical-align:middle;
  background:var(--line);margin:0 14px;
}
.contacts__names{
  display:flex;flex-wrap:wrap;justify-content:center;gap:14px;
}
.contacts__name{
  font-family:var(--serif);
  font-weight:600;
  font-size:18px;
  color:var(--ink);
  padding:10px 24px;
  border:1px solid var(--line);
  border-radius:6px;
  background:rgba(255,253,247,.6);
  transition:all .4s var(--ease);
}
.contacts__name:hover{
  background:var(--gold);color:var(--ink);
  border-color:var(--gold);transform:translateY(-2px);
}
.contacts__classes{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(150px,1fr));
  gap:14px;
}
.contacts__class{
  display:flex;align-items:center;gap:12px;
  padding:14px 18px;
  background:rgba(255,253,247,.6);
  border:1px solid var(--line-soft);
  border-radius:8px;
  transition:all .4s var(--ease);
}
.contacts__class:hover{
  border-color:var(--line);
  transform:translateY(-2px);
  box-shadow:0 12px 24px -16px rgba(11,22,38,.3);
}
.contacts__class-no{
  font-family:var(--serif);font-weight:700;
  font-size:15px;color:var(--gold-deep);
  flex:0 0 auto;
}
.contacts__class-name{
  font-family:var(--serif);font-weight:600;
  font-size:16px;color:var(--ink);
}

/* ============================================================
   登记表单
   ============================================================ */
.rsvp{background:linear-gradient(180deg,var(--paper-2),var(--paper))}
.rsvp__intro{
  max-width:760px;margin:0 auto 40px;
  text-align:center;
  font-size:14.5px;color:#6B5D49;line-height:1.9;
}
.rsvp__form{
  max-width:760px;margin:0 auto;
  padding:clamp(32px,4vw,48px);
  background:linear-gradient(180deg,#FFFDF7,#F7EFDE);
  border:1px solid var(--line-soft);
  border-radius:12px;
  box-shadow:0 30px 70px -40px rgba(11,22,38,.25);
}
.form__row{
  display:grid;grid-template-columns:1fr 1fr;gap:22px;
}
.form__field{margin-bottom:22px;display:flex;flex-direction:column}
.form__label{
  font-size:13px;letter-spacing:.12em;
  color:var(--ink);font-weight:500;
  margin-bottom:10px;
}
.form__req{color:var(--crimson)}
.form__input{
  font-family:var(--sans);
  font-size:15px;
  padding:13px 16px;
  background:#FFFDF7;
  border:1px solid var(--line-soft);
  border-radius:8px;
  color:var(--ink);
  transition:border-color .3s,box-shadow .3s,background .3s;
  width:100%;
}
.form__input::placeholder{color:#A99A82}
.form__input:focus{
  outline:none;
  border-color:var(--gold);
  background:#fff;
  box-shadow:0 0 0 3px rgba(201,168,106,.16);
}
.form__select{appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%239A7B3F' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 16px center;
  padding-right:40px;
}
.form__textarea{resize:vertical;min-height:84px;font-family:var(--sans)}
.form__radios{display:flex;flex-wrap:wrap;gap:10px}
.radio{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;
  font-size:14px;color:#3A2F20;
  background:#FFFDF7;
  border:1px solid var(--line-soft);
  border-radius:30px;
  cursor:pointer;
  transition:all .3s var(--ease);
}
.radio input{position:absolute;opacity:0;pointer-events:none}
.radio:hover{border-color:var(--line)}
.radio input:checked + span{color:var(--ink);font-weight:500}
.radio:has(input:checked){
  background:linear-gradient(145deg,var(--gold),var(--gold-deep));
  border-color:var(--gold);
  color:var(--ink);
  box-shadow:0 6px 16px -6px rgba(201,168,106,.5);
}
/* 分部分标题 */
.form__part{
  font-family:var(--serif);
  font-weight:700;
  font-size:17px;
  color:var(--ink);
  letter-spacing:.06em;
  margin:8px 0 20px;
  padding:14px 18px;
  background:linear-gradient(90deg,rgba(201,168,106,.14),transparent);
  border-left:3px solid var(--gold);
  border-radius:0 6px 6px 0;
  display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;
}
.form__part:first-child{margin-top:0}
.form__part-sub{
  font-family:var(--sans);
  font-weight:400;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--gold-deep);
}
.form__hint-inline{
  font-family:var(--sans);
  font-weight:400;
  font-size:12px;
  color:#A99A82;
  letter-spacing:.04em;
}
/* 复选框组 */
.form__checks{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}
.form__checks--inline{
  grid-template-columns:repeat(4,1fr);
}
.check{
  display:flex;align-items:flex-start;gap:10px;
  padding:12px 16px;
  font-size:14px;color:#3A2F20;line-height:1.5;
  background:#FFFDF7;
  border:1px solid var(--line-soft);
  border-radius:8px;
  cursor:pointer;
  transition:all .3s var(--ease);
}
.check input{
  flex:0 0 auto;
  width:17px;height:17px;
  margin-top:2px;
  accent-color:var(--gold-deep);
  cursor:pointer;
}
.check:hover{border-color:var(--line);background:#fff}
.check:has(input:checked){
  border-color:var(--gold);
  background:rgba(201,168,106,.1);
  box-shadow:0 4px 12px -6px rgba(201,168,106,.4);
}
.form__actions{
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  margin-top:8px;
  padding-top:24px;border-top:1px dashed var(--line);
}
.btn{
  font-family:var(--sans);
  font-weight:500;
  font-size:15px;
  letter-spacing:.12em;
  padding:14px 38px;
  border-radius:30px;
  transition:all .4s var(--ease);
}
.btn--primary{
  color:var(--ink);
  background:linear-gradient(145deg,var(--gold-light),var(--gold-deep));
  box-shadow:0 10px 24px -8px rgba(201,168,106,.55);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px -8px rgba(201,168,106,.65)}
.btn--ghost{
  color:var(--ink);
  background:transparent;
  border:1px solid var(--line);
}
.btn--ghost:hover{background:rgba(201,168,106,.12)}
.form__hint{font-size:12.5px;color:#8A7A62;letter-spacing:.04em}

.rsvp__success{
  max-width:560px;margin:0 auto;
  padding:clamp(40px,5vw,56px) clamp(28px,4vw,44px);
  background:linear-gradient(180deg,#FFFDF7,#F3E9D2);
  border:1px solid var(--line);
  border-radius:12px;
  text-align:center;
  box-shadow:0 30px 70px -40px rgba(11,22,38,.25);
  animation:fadeIn .6s var(--ease) both;
}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.rsvp__success-mark{
  display:inline-grid;place-items:center;
  width:84px;height:84px;border-radius:50%;
  color:var(--gold-deep);
  background:rgba(201,168,106,.14);
  margin-bottom:22px;
}
.rsvp__success-title{
  font-family:var(--serif);font-weight:700;
  font-size:24px;color:var(--ink);margin-bottom:12px;
}
.rsvp__success-text{
  font-size:15px;color:#6B5D49;line-height:1.8;margin-bottom:26px;
}

/* 只读问卷视图 */
.rsvp__view{
  max-width:760px;margin:0 auto;
  padding:clamp(32px,4vw,48px) clamp(24px,3.5vw,40px);
  background:linear-gradient(180deg,#FFFDF7,#F6EFDF);
  border:1px solid var(--line);
  border-radius:12px;
  box-shadow:0 30px 70px -40px rgba(11,22,38,.25);
  animation:fadeIn .6s var(--ease) both;
}
.rsvp__view-head{
  display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:12px;
  padding-bottom:20px;margin-bottom:24px;
  border-bottom:1px solid var(--line);
}
.rsvp__view-title{
  font-family:var(--serif);font-weight:700;
  font-size:22px;color:var(--ink);letter-spacing:.04em;
}
.rsvp__view-note{font-size:12.5px;color:#A99A82;letter-spacing:.06em}
.rsvp__view-body{font-size:14.5px;color:#3A2F20;line-height:1.7}
.rsvp__view-part{
  font-family:var(--serif);font-weight:700;font-size:16px;
  color:var(--ink);letter-spacing:.06em;
  margin:24px 0 14px;padding:10px 14px;
  background:linear-gradient(90deg,rgba(201,168,106,.14),transparent);
  border-left:3px solid var(--gold);border-radius:0 6px 6px 0;
}
.rsvp__view-part:first-child{margin-top:0}
.rsvp__view-row{
  display:grid;grid-template-columns:120px 1fr;gap:12px;
  padding:9px 0;border-bottom:1px dashed rgba(42,34,24,.08);
}
.rsvp__view-row:last-child{border-bottom:none}
.rsvp__view-key{color:#8A7A62;font-size:13px;letter-spacing:.04em}
.rsvp__view-val{color:#2A2218;font-weight:400;word-break:break-word}
.rsvp__view-val--empty{color:#C4B6A0;font-style:italic}
.rsvp__view-tags{display:flex;flex-wrap:wrap;gap:6px}
.rsvp__view-tag{
  display:inline-block;padding:3px 12px;
  font-size:12.5px;border-radius:14px;
  background:rgba(201,168,106,.16);color:#9A7B3F;
}
.rsvp__view-foot{
  margin-top:26px;padding-top:18px;
  border-top:1px dashed var(--line);
  font-size:12.5px;color:#A99A82;line-height:1.7;text-align:center;
}
@media (max-width:560px){
  .rsvp__view-row{grid-template-columns:1fr;gap:2px}
  .rsvp__view-key{font-size:12px}
}

/* ============================================================
   页脚
   ============================================================ */
.footer{
  position:relative;
  text-align:center;
  padding:clamp(80px,10vw,120px) 20px 60px;
  color:var(--cream);
  background:
    radial-gradient(80% 60% at 50% 0%,rgba(201,168,106,.16),transparent 60%),
    linear-gradient(180deg,#0B1626,#050B16);
  overflow:hidden;
}
.footer__seal{
  color:var(--crimson);
  margin-bottom:36px;
  opacity:.92;
  filter:drop-shadow(0 0 18px rgba(156,47,47,.4));
  animation:sealStamp 1s var(--ease-out) both;
  transform-origin:center;
}
@keyframes sealStamp{
  0%{opacity:0;transform:scale(1.6) rotate(-8deg)}
  60%{opacity:1;transform:scale(.94) rotate(0)}
  100%{opacity:.92;transform:scale(1) rotate(0)}
}
.footer__bigline{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(30px,5.5vw,52px);
  background:linear-gradient(180deg,#FBF3E0,#C9A86A);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  letter-spacing:.1em;
  margin-bottom:14px;
}
.footer__sub{
  font-family:var(--brush);
  font-size:clamp(24px,4vw,38px);
  color:var(--gold-light);
  letter-spacing:.16em;
  margin-bottom:48px;
}
.footer__meta{
  font-size:13px;color:var(--text-muted);line-height:1.9;
  letter-spacing:.06em;
  padding-top:36px;
  border-top:1px solid rgba(201,168,106,.16);
  max-width:560px;margin:0 auto;
}
.footer__salute{color:var(--gold-light);margin-top:6px}
.footer__tech{margin-top:18px;font-size:12px;letter-spacing:.16em;color:var(--text-muted)}

/* 返回顶部 */
.backtop{
  position:fixed;
  right:24px;bottom:24px;
  z-index:900;
  width:46px;height:46px;
  display:grid;place-items:center;
  color:var(--cream);
  background:rgba(11,22,38,.7);
  border:1px solid var(--line);
  border-radius:50%;
  backdrop-filter:blur(8px);
  opacity:0;pointer-events:none;
  transform:translateY(12px);
  transition:opacity .4s,transform .4s,background .3s;
}
.backtop.is-show{opacity:1;pointer-events:auto;transform:translateY(0)}
.backtop:hover{background:var(--gold);color:var(--ink)}

/* ============================================================
   滚动揭示动画
   ============================================================ */
.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .9s var(--ease-out),transform .9s var(--ease-out);
}
.reveal.is-in{opacity:1;transform:none}
.reveal:nth-child(2){transition-delay:.08s}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .overview__grid{grid-template-columns:repeat(2,1fr)}
  .generation__timeline{grid-template-columns:repeat(5,1fr);gap:8px}
  .gtl__text{font-size:12px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .nav__menu{
    position:fixed;
    top:0;right:0;
    width:78%;max-width:320px;
    height:100vh;
    flex-direction:column;
    align-items:flex-start;
    justify-content:center;
    gap:8px;
    padding:40px 32px;
    background:rgba(11,22,38,.96);
    backdrop-filter:blur(16px);
    transform:translateX(100%);
    transition:transform .45s var(--ease);
    box-shadow:-20px 0 60px rgba(0,0,0,.4);
  }
  .nav__menu.is-open{transform:translateX(0)}
  .nav__link{width:100%;padding:14px 8px;font-size:16px;color:var(--cream)}
  .nav__link--cta{margin-left:0;margin-top:12px;text-align:center}
  .nav__toggle{display:flex;z-index:1001}
  .nav__toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav__toggle.is-open span:nth-child(2){opacity:0}
  .nav__toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

  .hero{padding:110px 18px 90px}
  .hero__eyebrow{font-size:11px;gap:10px;letter-spacing:.24em;margin-bottom:26px}
  .hero__eyebrow-line{width:24px}
  .hero__title{letter-spacing:.04em}
  .hero__subtitle{letter-spacing:.2em;margin-bottom:32px}
  .hero__meta{gap:18px;margin-bottom:38px}
  .hero__meta-divider{display:none}
  .countdown{gap:8px}
  .countdown__item{min-width:0;flex:1;padding:11px 2px 9px}
  .countdown__num{font-size:24px}
  .countdown__unit{font-size:10px;margin-top:6px}
  .hero__scroll{display:none}

  .section{padding:64px 0}
  .section__head{margin-bottom:40px}
  .letter__body{padding:36px 22px}
  .letter__body p{text-indent:2em}
  .letter__quote{padding:20px 20px 20px 44px;font-size:17px}
  .letter__quote-mark{left:12px;font-size:40px}

  .overview__grid{grid-template-columns:1fr;gap:16px}
  .overview__card{padding:30px 22px}

  .schedule__day{padding:26px 20px;border-left-width:3px}
  .schedule__day-head{gap:16px;margin-bottom:20px;padding-bottom:18px}
  .schedule__day-chinese{width:52px;height:52px;font-size:28px}
  .schedule__list li{grid-template-columns:1fr;gap:6px}
  .schedule__time{padding-top:0;font-size:13px;color:var(--gold-deep)}
  .schedule__item h4{font-size:15px}

  .generation__timeline{
    grid-template-columns:1fr;
    gap:0;
  }
  .gtl__track{
    top:0;left:22px;right:auto;
    width:1px;height:100%;
    background:linear-gradient(180deg,transparent,var(--line) 8%,var(--line) 92%,transparent);
  }
  .generation__timeline.is-in .gtl__track span{width:1px;height:100%}
  .gtl__item{
    text-align:left;
    padding:0 0 28px 56px;
    position:relative;
  }
  .gtl__item::before{top:4px;left:16px;transform:none}
  .gtl__item:last-child{padding-bottom:0}

  .material__grid{grid-template-columns:1fr;gap:18px}
  .cost__panel{padding:36px 24px}
  .contacts__block{padding:28px 20px}

  .form__row{grid-template-columns:1fr;gap:0}
  .form__checks{grid-template-columns:1fr}
  .form__checks--inline{grid-template-columns:1fr 1fr}
  .form__actions{flex-direction:column;align-items:stretch}
  .form__actions .btn{width:100%;text-align:center}
  .form__hint{text-align:center}

  .footer{padding:64px 20px 48px}
  .footer__seal svg{width:96px;height:96px}
}

@media (max-width:420px){
  .hero__title{font-size:54px}
  .nav__brand-sub{display:none}
  .countdown__num{font-size:20px}
}

/* 减少动画偏好 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto;
  }
  .reveal{opacity:1;transform:none}
}