/* ============================================================
   Ruansik — Sunset Theme（背景凸显版）
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}

:root{
  --bg:#1a0d10;
  --bg-deep:#0c0508;
  --text:#f7e8df;
  --text-dim:#d3b0a4;
  --text-faint:#a07d73;

  --sunset:#ff7a3d;
  --sunset-bright:#ffb877;
  --rose:#e0577a;
  --violet:#9b5de5;
  --gold:#ffcf8b;

  --line:rgba(255,160,110,.16);
  --line-2:rgba(255,160,110,.38);

  --font-display:"Iowan Old Style","Palatino Linotype",Palatino,"Songti SC","Noto Serif SC",Georgia,serif;
  --font-sans:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --pad:clamp(20px,5vw,72px);
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html{
  scroll-behavior:smooth;
  scroll-padding-top:100px;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100vh;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

::selection{background:rgba(255,122,61,.35);color:#fff}

::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg-deep)}
::-webkit-scrollbar-thumb{background:#4a2a22;border-radius:10px}
::-webkit-scrollbar-thumb:hover{background:var(--sunset)}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;top:-100px;left:16px;z-index:300;
  padding:10px 18px;border-radius:6px;
  background:var(--sunset);color:#2a0f06;
  font-size:14px;font-weight:600;text-decoration:none;
  transition:top .3s var(--ease);
}
.skip-link:focus{top:16px}

/* ---------- 滚动进度 ---------- */
.scroll-progress{position:fixed;inset:0 0 auto;height:2px;z-index:120;background:rgba(255,160,110,.08)}
.scroll-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--sunset),var(--sunset-bright),var(--rose),var(--violet));
  box-shadow:0 0 12px rgba(255,122,61,.7);
}

/* ============================================================
   背景：落日图片优先
   ============================================================ */
.site-background{
  position:fixed;inset:0;z-index:-1;overflow:hidden;
  background:linear-gradient(180deg,#1d0c10 0%,#120609 55%,#0a0405 100%);
}

/* 底图：清晰可见，只做轻微暖调 */
.site-background__image{
  position:absolute;inset:0;z-index:0;
  width:100%;height:100%;
  object-fit:cover;
  object-position:center;
  opacity:.92;
  filter:saturate(1.06) brightness(.94) contrast(1.04);
  animation:bg-zoom 52s ease-in-out infinite alternate;
  will-change:transform;
}
@keyframes bg-zoom{
  0%{transform:scale(1.02)}
  100%{transform:scale(1.09)}
}

/* 暖色薄叠加 + 四周暗角，保证文字可读又不压暗画面 */
.site-background__tint{
  position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    radial-gradient(130% 110% at 50% 45%, transparent 38%, rgba(10,4,6,.55) 100%),
    linear-gradient(180deg, rgba(16,6,8,.62) 0%, rgba(16,6,8,.10) 16%, rgba(10,4,6,.08) 60%, rgba(6,3,4,.88) 100%);
}

/* 左侧局部暗晕：只压住 Hero 文案区，右边保留原图 */
.site-background__shade{
  position:absolute;inset:0;z-index:3;pointer-events:none;
  background:
    linear-gradient(90deg, rgba(10,4,6,.66) 0%, rgba(10,4,6,.42) 26%, rgba(10,4,6,.10) 48%, transparent 62%),
    radial-gradient(80% 70% at 22% 52%, rgba(10,4,6,.38) 0%, transparent 70%);
}

/* 光晕：降低强度，避免糊住落日 */
.site-background__drift{position:absolute;inset:-10%;z-index:2;animation:bg-drift 46s ease-in-out infinite alternate;opacity:.55}
.site-background__glow{position:absolute;border-radius:50%;filter:blur(110px);mix-blend-mode:screen}
.site-background__glow--a{
  width:46vw;height:46vw;left:-10vw;top:-12vw;
  background:radial-gradient(circle,rgba(255,122,61,.26),transparent 70%);
  animation:glow-a 22s ease-in-out infinite alternate;
}
.site-background__glow--b{
  width:40vw;height:40vw;right:-8vw;top:16vw;
  background:radial-gradient(circle,rgba(224,87,122,.18),transparent 70%);
  animation:glow-b 28s ease-in-out infinite alternate;
}
.site-background__glow--c{
  width:34vw;height:34vw;left:22vw;bottom:-14vw;
  background:radial-gradient(circle,rgba(155,93,229,.14),transparent 70%);
  animation:glow-c 34s ease-in-out infinite alternate;
}
.site-background__beam{
  position:absolute;top:-45%;left:62%;width:46vw;height:170vh;
  transform:translateX(-50%) rotate(14deg);
  background:linear-gradient(180deg,rgba(255,184,119,.12),transparent 60%);
  filter:blur(70px);opacity:.4;
  animation:beam 18s ease-in-out infinite alternate;
}

/* 噪点 */
.site-background::after{
  content:"";position:absolute;inset:0;z-index:4;pointer-events:none;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@keyframes bg-drift{
  0%{transform:translate3d(0,0,0) scale(1)}
  100%{transform:translate3d(-1.6%,1.2%,0) scale(1.04)}
}
@keyframes glow-a{to{transform:translate3d(5vw,3vw,0) scale(1.12)}}
@keyframes glow-b{to{transform:translate3d(-4vw,5vw,0) scale(1.08)}}
@keyframes glow-c{to{transform:translate3d(2vw,-3vw,0) scale(1.15)}}
@keyframes beam{
  0%{transform:translateX(-50%) rotate(14deg) scaleY(1);opacity:.35}
  100%{transform:translateX(-50%) rotate(10deg) scaleY(1.08);opacity:.6}
}

/* ---------- 页头 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:18px var(--pad);
  transition:background .4s var(--ease),backdrop-filter .4s,padding .4s var(--ease),border-color .4s;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  padding-top:12px;padding-bottom:12px;
  background:rgba(12,5,8,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom-color:var(--line);
}
.site-header__inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}

.wordmark{
  display:flex;flex-direction:column;
  line-height:1.15;text-decoration:none;
  font-family:var(--font-display);
  font-size:13px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--text);
  text-shadow:0 1px 12px rgba(0,0,0,.55);
  transition:opacity .3s;
}
.wordmark:hover{opacity:.75}
.wordmark span:last-child{color:var(--sunset-bright)}

.site-nav{display:flex;gap:clamp(16px,3vw,40px)}
.site-nav a{
  display:flex;align-items:baseline;gap:8px;
  color:var(--text-dim);text-decoration:none;font-size:14px;
  text-shadow:0 1px 10px rgba(0,0,0,.5);
  transition:color .3s;
}
.site-nav__number{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  color:var(--text-faint);transition:color .3s;
}
.site-nav a span:last-child{position:relative}
.site-nav a span:last-child::after{
  content:"";position:absolute;left:0;bottom:-6px;width:100%;height:1px;
  background:var(--sunset);
  transform:scaleX(0);transform-origin:right;
  transition:transform .35s var(--ease);
}
.site-nav a:hover,.site-nav a.is-active{color:var(--sunset-bright)}
.site-nav a:hover .site-nav__number,.site-nav a.is-active .site-nav__number{color:var(--sunset)}
.site-nav a:hover span:last-child::after,
.site-nav a.is-active span:last-child::after{transform:scaleX(1);transform-origin:left}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;
  padding:140px var(--pad) 130px;
  overflow:hidden;
}
.hero__inner{width:100%;max-width:var(--maxw);margin:0 auto}
.hero__content{max-width:920px}

.hero__kicker{
  display:flex;align-items:center;gap:12px;
  margin:0 0 clamp(22px,4vh,38px);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.32em;
  color:var(--text-dim);text-transform:uppercase;
  text-shadow:0 1px 10px rgba(0,0,0,.6);
}
.square-mark{
  width:8px;height:8px;background:var(--sunset);flex:none;
  box-shadow:0 0 0 4px rgba(255,122,61,.16), 0 0 18px rgba(255,122,61,.5);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{50%{box-shadow:0 0 0 9px rgba(255,122,61,.04), 0 0 22px rgba(255,122,61,.7)}}

.hero__title{
  margin:0;
  font-family:var(--font-display);
  font-weight:400;
  font-size:clamp(3.4rem,13vw,9.5rem);
  line-height:.9;
  letter-spacing:-.035em;
}
.hero__title-line{display:block;overflow:hidden;padding-bottom:.1em}
.hero__title-line>span{
  display:inline-block;
  transform:translateY(115%);
  animation:title-rise 1.1s var(--ease) forwards;
}
@keyframes title-rise{to{transform:translateY(0)}}

.hero__title-line>span{
  background:linear-gradient(96deg,var(--gold) 0%,var(--sunset) 42%,var(--rose) 74%,var(--violet) 100%);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
  filter:drop-shadow(0 4px 22px rgba(20,6,8,.55));
}

.hero__intro{margin-top:clamp(26px,4vh,44px);max-width:580px}
.hero__poem{
  margin:0 0 14px;
  font-family:var(--font-display);
  font-size:clamp(1.35rem,2.5vw,1.95rem);
  line-height:1.45;letter-spacing:.02em;color:var(--text);
  text-shadow:0 2px 16px rgba(0,0,0,.6);
}
.hero__poem em{
  font-style:normal;
  background:linear-gradient(90deg,var(--sunset-bright),var(--rose));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 18px rgba(255,122,61,.45));
}
.hero__description{
  margin:0;color:var(--text-dim);
  font-size:clamp(.95rem,1.4vw,1.05rem);line-height:1.9;
  text-shadow:0 1px 12px rgba(0,0,0,.65);
}

.hero__actions{margin-top:clamp(26px,4vh,44px)}
.text-link{
  display:inline-flex;align-items:center;gap:10px;
  color:var(--text);text-decoration:none;font-size:15px;
  padding-bottom:6px;border-bottom:1px solid var(--line-2);
  text-shadow:0 1px 10px rgba(0,0,0,.6);
  transition:color .3s,border-color .3s,gap .3s var(--ease);
}
.text-link:hover{color:var(--sunset-bright);border-color:var(--sunset);gap:18px}

.hero__foot{
  position:absolute;left:var(--pad);right:var(--pad);
  bottom:clamp(20px,4vh,42px);
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.hero__identity{
  display:flex;flex-wrap:wrap;gap:10px 24px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
  color:var(--text-dim);
  text-shadow:0 1px 10px rgba(0,0,0,.7);
}
.hero__identity span{position:relative}
.hero__identity span+span::before{
  content:"";position:absolute;left:-13px;top:50%;
  width:3px;height:3px;border-radius:50%;
  background:var(--sunset);transform:translateY(-50%);
}

.scroll-cue{
  display:flex;align-items:center;gap:14px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;
  color:var(--text-dim);text-decoration:none;
  text-shadow:0 1px 10px rgba(0,0,0,.7);
  transition:color .3s;
}
.scroll-cue:hover{color:var(--sunset-bright)}
.scroll-cue i{
  position:relative;display:block;width:1px;height:38px;overflow:hidden;
  background:linear-gradient(180deg,var(--sunset),transparent);
}
.scroll-cue i::after{
  content:"";position:absolute;top:0;left:0;width:1px;height:13px;
  background:var(--sunset-bright);
  animation:cue 2.1s ease-in-out infinite;
}
@keyframes cue{
  0%{transform:translateY(-14px);opacity:0}
  40%{opacity:1}
  100%{transform:translateY(40px);opacity:0}
}

.hero__side-note{
  position:absolute;right:calc(var(--pad) - 44px);top:50%;
  transform:translateY(-50%);
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.42em;
  color:rgba(211,176,164,.42);
  text-shadow:0 1px 10px rgba(0,0,0,.6);
  pointer-events:none;
}

/* ---------- 通用章节 ---------- */
.content-section{position:relative;padding:clamp(72px,12vh,140px) var(--pad)}
.section__inner{max-width:var(--maxw);margin:0 auto}

.section-heading{margin-bottom:clamp(36px,6vh,64px)}
.section-heading__index{
  margin:0 0 16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;
  color:var(--sunset);text-transform:uppercase;
}
.section-heading__main{display:flex;align-items:center;gap:clamp(16px,3vw,36px)}
.section-heading__main h2{
  margin:0;
  font-family:var(--font-display);font-weight:400;
  font-size:clamp(2rem,4.4vw,3.2rem);
  letter-spacing:-.02em;
  display:flex;align-items:baseline;gap:clamp(10px,2vw,22px);flex-wrap:wrap;
  text-shadow:0 2px 18px rgba(0,0,0,.5);
}
.section-heading__main h2 span{
  font-family:var(--font-mono);font-size:.28em;letter-spacing:.32em;
  color:var(--text-faint);text-transform:uppercase;
}
.section-heading__line{
  flex:1;min-width:40px;height:1px;
  background:linear-gradient(90deg,var(--line-2),transparent);
}

.section-lead{
  max-width:640px;
  margin:-20px 0 clamp(30px,5vh,52px);
  color:var(--text-dim);
  font-size:clamp(.95rem,1.3vw,1.05rem);
  text-shadow:0 1px 12px rgba(0,0,0,.6);
}

/* ---------- 关于 ---------- */
.about-grid{display:grid;gap:32px}
.about-quote{position:relative;margin:0;padding-left:clamp(0px,3vw,28px)}
.about-quote::before{
  content:"“";
  position:absolute;left:-.08em;top:-.62em;
  font-family:var(--font-display);
  font-size:clamp(4rem,10vw,9rem);line-height:1;
  color:var(--sunset);opacity:.18;
  pointer-events:none;user-select:none;
}
.about-quote p{
  position:relative;margin:0;
  font-family:var(--font-display);
  font-size:clamp(1.5rem,3.6vw,2.6rem);
  line-height:1.55;letter-spacing:.01em;
  color:var(--text);
  text-shadow:0 2px 18px rgba(0,0,0,.55);
}

.facts{
  margin:clamp(36px,6vh,60px) 0 0;
  display:grid;gap:18px;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  border-top:1px solid var(--line);
  padding-top:clamp(20px,3vh,32px);
}
.facts>div{display:grid;gap:4px}
.facts dt{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.28em;
  color:var(--text-faint);text-transform:uppercase;
}
.facts dd{
  margin:0;font-size:1.1rem;letter-spacing:.02em;
  color:var(--sunset-bright);
  text-shadow:0 1px 12px rgba(0,0,0,.5);
}

/* ---------- 邮箱列表 ---------- */
.email-list{display:grid;gap:14px;margin-bottom:clamp(30px,5vh,52px)}
.email-item{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(14px,3vw,32px);
  padding:clamp(16px,2.4vw,24px) clamp(16px,2.6vw,28px);
  border:1px solid var(--line);
  border-left:2px solid var(--line-2);
  border-radius:3px;
  background:rgba(24,10,13,.72);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .35s,background .35s,transform .35s var(--ease);
}
.email-item:hover{
  border-color:var(--line-2);
  border-left-color:var(--sunset);
  background:rgba(40,18,22,.85);
  transform:translateY(-2px);
}
.email-item__label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;
  color:var(--text-faint);white-space:nowrap;
}
.email-item a{
  color:var(--text);text-decoration:none;
  font-family:var(--font-mono);
  font-size:clamp(.95rem,2vw,1.12rem);
  letter-spacing:.02em;
  transition:color .3s;
  overflow-wrap:anywhere;
}
.email-item a:hover{color:var(--sunset-bright)}

.copy-button{
  display:inline-flex;align-items:center;justify-content:center;
  padding:8px 18px;
  border:1px solid var(--line-2);border-radius:999px;
  background:transparent;color:var(--text-dim);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  cursor:pointer;
  transition:border-color .3s,color .3s,background .3s;
}
.copy-button:hover{
  border-color:var(--sunset);color:var(--sunset-bright);
  background:rgba(255,122,61,.12);
}
.copy-button.is-copied{
  border-color:var(--sunset);background:var(--sunset);color:#2a0f06;
}

/* ---------- 联系网格 ---------- */
.contact-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:3px;
  overflow:hidden;
}
.contact-item{
  position:relative;
  display:flex;flex-direction:column;gap:6px;
  padding:clamp(20px,3vw,32px);
  background:rgba(14,6,9,.8);
  text-decoration:none;color:var(--text);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:background .4s var(--ease);
}
.contact-item--wide{grid-column:span 2}
.contact-item:hover{background:rgba(44,18,23,.94)}
.contact-item__platform{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;
  color:var(--text-faint);text-transform:uppercase;
}
.contact-item strong{
  font-weight:500;font-size:clamp(.95rem,1.6vw,1.05rem);
  transition:color .3s;
}
.contact-item:hover strong{color:var(--sunset-bright)}
.contact-item i{
  position:absolute;
  right:clamp(16px,3vw,28px);top:clamp(18px,3vw,28px);
  font-style:normal;color:var(--text-faint);
  transition:transform .35s var(--ease),color .3s;
}
.contact-item:hover i{transform:translate(3px,-3px);color:var(--sunset)}

/* ---------- 页脚 ---------- */
.site-footer{
  padding:clamp(32px,5vh,56px) var(--pad) clamp(28px,4vh,44px);
  border-top:1px solid var(--line);
  background:rgba(8,4,5,.62);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.site-footer__inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:16px 32px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--text-faint);
}
.site-footer__inner p{margin:0}
.site-footer__links{display:flex;gap:24px}
.site-footer__links a{color:var(--text-dim);text-decoration:none;transition:color .3s}
.site-footer__links a:hover{color:var(--sunset-bright)}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:32px;z-index:300;
  transform:translate(-50%,150%);
  padding:12px 26px;border-radius:999px;
  background:linear-gradient(90deg,var(--sunset),var(--rose));
  color:#2a0f06;
  font-size:13px;font-weight:600;letter-spacing:.04em;
  box-shadow:0 14px 36px rgba(0,0,0,.5);
  opacity:0;pointer-events:none;
  transition:transform .45s var(--ease),opacity .3s;
}
.toast.is-visible{transform:translate(-50%,0);opacity:1}

/* ---------- 揭示动画 ---------- */
.js .reveal{
  opacity:0;transform:translateY(26px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
}
.js .reveal.is-visible{opacity:1;transform:none}
.js .reveal[data-delay="1"]{transition-delay:.08s}
.js .reveal[data-delay="2"]{transition-delay:.16s}
.js .reveal[data-delay="3"]{transition-delay:.24s}
.js .reveal[data-delay="4"]{transition-delay:.32s}
.js .reveal[data-delay="5"]{transition-delay:.4s}
.js .reveal[data-delay="6"]{transition-delay:.48s}
.js .reveal[data-delay="7"]{transition-delay:.56s}
.js .reveal[data-delay="8"]{transition-delay:.64s}
.js .reveal[data-delay="9"]{transition-delay:.72s}
.js .reveal[data-delay="10"]{transition-delay:.8s}

/* ---------- 响应式 ---------- */
@media (max-width:760px){
  .hero{padding:120px var(--pad) 170px}
  .hero__foot{flex-direction:column;align-items:flex-start;gap:20px}
  .hero__side-note{display:none}

  /* 手机上文字压在中间，改成上下暗、中间透 */
  .site-background__shade{
    background:
      linear-gradient(180deg, rgba(10,4,6,.62) 0%, rgba(10,4,6,.20) 30%, rgba(10,4,6,.28) 60%, rgba(6,3,4,.85) 100%),
      radial-gradient(120% 70% at 50% 40%, rgba(10,4,6,.42) 0%, transparent 72%);
  }
  .site-background__image{object-position:center}

  .section-heading__main{flex-direction:column;align-items:flex-start;gap:14px}
  .section-heading__line{width:100%;flex:none}

  .about-quote{padding-left:0}

  .email-item{grid-template-columns:1fr;gap:12px;padding:20px}
  .email-item .copy-button{justify-self:start}

  .contact-grid{grid-template-columns:1fr}
  .contact-item--wide{grid-column:auto}

  .site-footer__inner{flex-direction:column;align-items:flex-start}
}

@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}
  .hero__title-line>span{transform:none}
}