/* ============================================================
   黄纯映像 · 全站共享样式
   ============================================================ */

/* ---------- 1. Reset / Variables ---------- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}

:root{
  --c-primary:#FFD400;
  --c-secondary:#FFC107;
  --c-cream:#FFF4D6;
  --c-pink:#FFB6C1;
  --c-orange:#FF9F1C;
  --c-brown:#6B4F2E;
  --c-ink:#2D2A26;
  --c-white:#FFFFFF;
  --c-bg:#FDF3E3;
  --c-highlight:#FFF3B0;

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,"SimSun",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;

  --radius-sm:6px;
  --radius-md:14px;
  --radius-lg:24px;
  --radius-full:999px;

  --shadow-sm:0 2px 6px rgba(45,42,38,.08);
  --shadow-md:0 4px 16px rgba(45,42,38,.12);
  --shadow-lg:0 8px 30px rgba(45,42,38,.16);

  --content-max:1280px;
}

html{
  font-size:16px;
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  color:var(--c-ink);
  background:
    radial-gradient(ellipse 90% 50% at 50% 0%,rgba(255,212,0,.07),transparent 70%),
    var(--c-bg);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

a{
  color:var(--c-ink);
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}

img{max-width:100%;display:block;}

ul,ol{list-style:none;}

h1,h2,h3,h4{
  font-family:var(--font-head);
  line-height:1.2;
  font-weight:900;
  color:var(--c-ink);
}

/* ---------- 2. Focus / Selection ---------- */
:focus-visible{
  outline:3px solid var(--c-orange);
  outline-offset:2px;
  border-radius:2px;
}

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

@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    transition-duration:.01ms !important;
  }
  html{scroll-behavior:auto;}
}

/* ---------- 3. Skip Link ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-120px;
  z-index:2000;
  padding:10px 18px;
  background:var(--c-ink);
  color:var(--c-primary);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  border-radius:var(--radius-sm);
  text-decoration:none;
  box-shadow:var(--shadow-md);
  transition:top .18s ease;
}
.skip-link:focus-visible{
  top:12px;
}
@media (prefers-reduced-motion: reduce){
  .skip-link{transition:none;}
}

/* ---------- 4. Header ---------- */
.site-header{
  position:relative;
  background:var(--c-cream);
  border-bottom:4px solid var(--c-primary);
  box-shadow:0 1px 0 rgba(45,42,38,.06);
  z-index:500;
}

.header-tape{
  height:6px;
  background:linear-gradient(
    to right,
    var(--c-primary) 0%,
    var(--c-primary) 72%,
    var(--c-pink) 72%,
    var(--c-pink) 86%,
    var(--c-orange) 86%
  );
}

.header-frame{
  max-width:var(--content-max);
  margin:0 auto;
  padding:10px 24px;
  min-height:var(--header-min-h,72px);
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  column-gap:28px;
  row-gap:10px;
}

/* 品牌 */
.brand-block{
  display:flex;
  align-items:center;
}

.brand-link{
  display:flex;
  align-items:center;
  column-gap:12px;
  text-decoration:none;
  color:inherit;
}

.brand-seal{
  flex:none;
  width:50px;
  height:50px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:var(--c-primary);
  border:2px solid var(--c-ink);
  border-radius:50%;
  font-family:var(--font-head);
  font-size:26px;
  font-weight:900;
  color:var(--c-ink);
  box-shadow:2px 2px 0 rgba(45,42,38,.22);
  transition:box-shadow .15s ease;
}

.brand-link:hover .brand-seal{
  box-shadow:3px 3px 0 rgba(45,42,38,.3);
}

.brand-copy{
  display:flex;
  flex-direction:column;
  line-height:1.15;
}

.brand-name{
  font-family:var(--font-head);
  font-size:28px;
  font-weight:900;
  letter-spacing:.1em;
  color:var(--c-ink);
  text-shadow:
    1px 1px 0 var(--c-primary),
    2px 2px 0 var(--c-pink);
}

.brand-slogan{
  font-size:12px;
  color:var(--c-brown);
  letter-spacing:.04em;
  margin-top:3px;
}

/* 导航 */
.site-nav{
  margin-left:auto;
}

.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
}

.nav-item{list-style:none;}

.nav-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 16px;
  background:var(--c-primary);
  border:2px solid var(--c-ink);
  border-radius:var(--radius-full);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  line-height:1.3;
  color:var(--c-ink);
  text-decoration:none;
  white-space:nowrap;
  transition:
    background .12s ease,
    color .12s ease,
    box-shadow .12s ease,
    transform .12s ease;
}

.nav-link::before{
  content:'';
  width:5px;
  height:5px;
  border-radius:50%;
  background:currentColor;
  opacity:.5;
  flex:none;
}

.nav-link:hover{
  background:var(--c-orange);
  box-shadow:2px 2px 0 var(--c-ink);
  transform:translateY(-1px);
}

.nav-link[aria-current="page"]{
  background:var(--c-ink);
  color:var(--c-primary);
  border-color:var(--c-ink);
  box-shadow:2px 2px 0 var(--c-brown);
}

.nav-link[aria-current="page"]::before{
  content:'■';
  width:auto;
  height:auto;
  background:none;
  font-size:9px;
  opacity:.9;
}

@media (prefers-reduced-motion: reduce){
  .nav-link{
    transition:none;
    transform:none;
  }
  .nav-link:hover{transform:none;}
}

/* 移动端导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 16px;
  background:var(--c-primary);
  border:2px solid var(--c-ink);
  border-radius:var(--radius-full);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  color:var(--c-ink);
  cursor:pointer;
  line-height:1.2;
  transition:background .12s ease,box-shadow .12s ease;
}
.nav-toggle:hover{
  background:var(--c-orange);
  box-shadow:2px 2px 0 var(--c-ink);
}

.nav-toggle-label{
  font-size:13px;
  letter-spacing:.06em;
}

.nav-toggle-icon{
  position:relative;
  width:18px;
  height:14px;
  display:inline-block;
}
.nav-toggle-icon i{
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  border-radius:1px;
  transition:top .15s ease,transform .15s ease,opacity .15s ease;
}
.nav-toggle-icon i:nth-child(1){top:0;}
.nav-toggle-icon i:nth-child(2){top:6px;}
.nav-toggle-icon i:nth-child(3){top:12px;}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(1){
  top:6px;
  transform:rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(2){
  opacity:0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(3){
  top:6px;
  transform:rotate(-45deg);
}

@media (prefers-reduced-motion: reduce){
  .nav-toggle,
  .nav-toggle-icon i{transition:none;}
}

/* 滚动进度条 */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  height:3px;
  width:0%;
  background:linear-gradient(to right,var(--c-orange),var(--c-pink));
  z-index:1000;
  pointer-events:none;
}
@media (prefers-reduced-motion: reduce){
  .scroll-progress{transition:none;}
}

/* ---------- 5. Mobile Nav ---------- */
@media (max-width: 768px){
  .site-header{
    border-bottom-width:3px;
  }
  .header-frame{
    padding:10px 16px;
    column-gap:14px;
  }
  .nav-toggle{
    display:inline-flex;
  }
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    margin-left:0;
    background:var(--c-cream);
    padding:16px 20px 20px;
    border-bottom:3px solid var(--c-ink);
    box-shadow:0 14px 28px rgba(45,42,38,.14);
    z-index:100;
  }
  .site-nav[data-open]{
    display:block;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:8px;
  }
  .nav-link{
    display:flex;
    width:100%;
    justify-content:flex-start;
    padding:10px 18px;
    font-size:15px;
  }
  .brand-slogan{
    font-size:11px;
  }
}

@media (max-width: 420px){
  .brand-name{
    font-size:24px;
  }
  .brand-seal{
    width:44px;
    height:44px;
    font-size:22px;
  }
  .nav-toggle-label{
    display:none;
  }
}

/* ---------- 6. Footer ---------- */
.site-footer{
  position:relative;
  background:var(--c-ink);
  color:var(--c-cream);
  overflow:hidden;
}

.site-footer::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:5px;
  background:linear-gradient(
    to right,
    var(--c-primary) 0%,
    var(--c-primary) 70%,
    var(--c-pink) 70%,
    var(--c-pink) 85%,
    var(--c-orange) 85%
  );
}

.site-footer::after{
  content:'黄';
  position:absolute;
  right:6px;
  bottom:-16px;
  font-family:var(--font-head);
  font-style:normal;
  font-size:120px;
  font-weight:900;
  line-height:1;
  color:var(--c-primary);
  opacity:.06;
  pointer-events:none;
  transform:rotate(-6deg);
}

.footer-inner{
  max-width:var(--content-max);
  margin:0 auto;
  padding:52px 24px 36px;
  display:grid;
  grid-template-columns:1.2fr 1.8fr;
  gap:48px;
  position:relative;
  z-index:1;
}

.footer-brand-block{
  display:flex;
  column-gap:14px;
  align-items:flex-start;
}

.footer-seal{
  flex:none;
  width:46px;
  height:46px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:var(--c-primary);
  border:2px solid var(--c-cream);
  border-radius:50%;
  font-family:var(--font-head);
  font-size:22px;
  font-weight:900;
  color:var(--c-ink);
  box-shadow:0 0 0 2px var(--c-ink),0 0 0 3px var(--c-primary);
  margin-top:2px;
}

.footer-brand-copy{
  display:flex;
  flex-direction:column;
  gap:6px;
}

.footer-brand-name{
  font-family:var(--font-head);
  font-size:22px;
  font-weight:900;
  letter-spacing:.1em;
  color:var(--c-primary);
}

.footer-brand-line{
  font-size:13px;
  color:var(--c-cream);
  opacity:.75;
  letter-spacing:.04em;
}

.footer-trust{
  font-size:12px;
  color:var(--c-cream);
  opacity:.55;
  border-left:3px solid var(--c-orange);
  padding-left:10px;
  margin-top:4px;
  max-width:220px;
}

.footer-meta{
  display:grid;
  grid-template-columns:1.2fr 1fr .85fr;
  gap:24px;
}

.footer-contact{
  list-style:none;
  font-size:14px;
  line-height:1.8;
  color:var(--c-cream);
  opacity:.85;
}

.footer-contact li{
  padding-left:18px;
  position:relative;
}
.footer-contact li::before{
  content:'⊙';
  position:absolute;
  left:0;
  top:0;
  color:var(--c-orange);
}

.footer-navlist,
.footer-legal{
  display:flex;
  flex-direction:column;
  gap:8px;
  font-size:14px;
}

.footer-navlist a,
.footer-legal a{
  color:var(--c-cream);
  text-decoration:none;
  opacity:.85;
  transition:color .12s ease,opacity .12s ease;
}
.footer-navlist a:hover,
.footer-legal a:hover{
  color:var(--c-primary);
  opacity:1;
  text-decoration:underline;
  text-underline-offset:4px;
}

.footer-bottom{
  position:relative;
  z-index:1;
  max-width:var(--content-max);
  margin:0 auto;
  padding:16px 24px;
  border-top:1px solid rgba(255,244,214,.18);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  font-size:12px;
  color:var(--c-cream);
  opacity:.55;
  flex-wrap:wrap;
}

@media (max-width: 960px){
  .footer-inner{
    grid-template-columns:1fr;
    gap:28px;
  }
  .footer-meta{
    grid-template-columns:1fr 1fr;
  }
}

@media (max-width: 560px){
  .footer-inner{
    padding:32px 16px 24px;
  }
  .footer-meta{
    grid-template-columns:1fr;
    gap:18px;
  }
  .footer-bottom{
    flex-direction:column;
    text-align:center;
    padding:14px 16px;
  }
  .site-footer::after{
    font-size:80px;
  }
}

/* ---------- 7. Container / Sections ---------- */
.container{
  width:100%;
  max-width:var(--content-max);
  margin:0 auto;
  padding:0 24px;
}

.section{
  padding:44px 0;
}

.section + .section{
  border-top:1px dashed rgba(107,79,46,.25);
}

.section-title{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:26px;
  letter-spacing:.03em;
  margin-bottom:10px;
}
.section-title::before{
  content:'◼';
  font-size:14px;
  color:var(--c-orange);
  transform:translateY(-2px);
}

.section-desc{
  color:var(--c-brown);
  font-size:15px;
  max-width:660px;
  margin-bottom:24px;
}

.chapter-tag{
  display:inline-block;
  padding:3px 12px;
  background:var(--c-highlight);
  border:1.5px dashed var(--c-brown);
  border-radius:4px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--c-brown);
  line-height:1.4;
}

/* ---------- 8. Page Header / Breadcrumb ---------- */
.page-header{
  padding:52px 0 28px;
  position:relative;
}

.page-header::after{
  content:'';
  position:absolute;
  left:0;
  bottom:0;
  height:3px;
  width:72px;
  background:var(--c-primary);
  border-radius:2px;
}

.page-title{
  font-size:40px;
  letter-spacing:.06em;
  line-height:1.15;
}

.page-subtitle{
  margin-top:10px;
  font-size:15px;
  color:var(--c-brown);
  max-width:560px;
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding:14px 0;
  font-size:13px;
  color:var(--c-brown);
}

.breadcrumb li{
  display:flex;
  align-items:center;
}
.breadcrumb li + li::before{
  content:'/';
  margin-right:6px;
  opacity:.4;
  font-family:var(--font-mono);
}
.breadcrumb a{
  color:var(--c-ink);
  text-decoration:none;
}
.breadcrumb a:hover{
  color:var(--c-orange);
}
.breadcrumb [aria-current="page"]{
  color:var(--c-brown);
  font-weight:500;
}

/* ---------- 9. Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 26px;
  background:var(--c-primary);
  border:2px solid var(--c-ink);
  border-radius:var(--radius-full);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  color:var(--c-ink);
  text-decoration:none;
  cursor:pointer;
  line-height:1.4;
  transition:background .12s ease,box-shadow .12s ease,transform .12s ease;
}
.btn:hover{
  background:var(--c-orange);
  box-shadow:3px 3px 0 var(--c-ink);
  transform:translateY(-1px);
}
.btn-secondary{
  background:transparent;
  color:var(--c-ink);
  border-style:dashed;
}
.btn-secondary:hover{
  background:var(--c-highlight);
  box-shadow:2px 2px 0 var(--c-brown);
}
@media (prefers-reduced-motion: reduce){
  .btn{transition:none;}
  .btn:hover{transform:none;}
}

/* ---------- 10. Visual Containers ---------- */
.visual-container{
  position:relative;
  overflow:hidden;
  background:var(--c-cream);
  border:2px solid var(--c-ink);
  border-radius:var(--radius-md);
  box-shadow:var(--shadow-sm);
  aspect-ratio:4/3;
  transition:box-shadow .15s ease;
}
.visual-container:hover{
  box-shadow:var(--shadow-md);
}
.visual-container img,
.visual-container video{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.visual-caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:8px 14px;
  background:rgba(45,42,38,.72);
  color:var(--c-cream);
  font-size:13px;
  line-height:1.4;
  z-index:2;
}

/* ---------- 11. Helpers ---------- */
.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}