/* ==========================================================
   安博APP 共享 Site CSS
   设计体系：编辑部竞技场 / 清透渐变 / 非对称构图
   ========================================================== */

/* ---------- 1. Reset & Design Tokens ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{
  scroll-padding-top:calc(var(--header-h) + 16px);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
body{
  font-family:var(--body-font);
  font-size:1rem;
  line-height:1.7;
  color:var(--deep-green);
  background:var(--white);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,optgroup,select,textarea{font:inherit;color:inherit;border:0;background:none}
button{cursor:pointer}
table{border-collapse:collapse}
[id]{scroll-margin-top:calc(var(--header-h) + 16px)}

:root{
  --pitch-green:#2E7D32;
  --pitch-green-deep:#1B5E20;
  --night-purple:#5E35B1;
  --night-purple-deep:#4527A0;
  --hot-orange:#FF5722;
  --deep-green:#1B3B1F;
  --dark-purple:#1A1A2E;
  --moon-gray:#F5F5F5;
  --white:#FFFFFF;
  --track-orange:#FFB300;
  --heading-font:"Archivo Black","Helvetica Neue",Arial,sans-serif;
  --body-font:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --accent-font:"Space Mono","Courier New",monospace;
  --container-w:1200px;
  --header-h:72px;
  --radius-lg:20px;
  --radius-md:12px;
  --radius-sm:6px;
  --shadow-soft:0 8px 32px rgba(27,59,31,.12);
  --shadow-strong:0 12px 40px rgba(26,26,46,.25);
  --transition:.35s cubic-bezier(.22,1,.36,1);
}

/* ---------- 2. 基础排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--heading-font);
  line-height:1.15;
  color:var(--deep-green);
  text-transform:uppercase;
  letter-spacing:.01em;
}
h1{font-size:clamp(2.25rem,6vw,4rem);font-weight:900;font-style:italic}
h2{font-size:clamp(1.75rem,4.5vw,2.75rem);font-weight:900}
h3{font-size:clamp(1.25rem,2.5vw,1.75rem);font-weight:900}
h4{font-size:1rem;font-weight:900}
p{color:rgba(27,59,31,.85)}
.lead{font-size:1.125rem;line-height:1.8;color:rgba(27,59,31,.72)}
em{font-style:italic}

/* ---------- 3. 容器 / 栅格 / 章节 ---------- */
.container{width:min(var(--container-w),92vw);margin-inline:auto}
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-narrow{grid-template-columns:minmax(0,1fr) minmax(0,2.4fr);gap:48px}
.section{padding-block:56px}
.section-heading{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  margin-bottom:28px;
}

/* 编辑部符号 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--accent-font);
  font-size:.8125rem;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--night-purple);
  background:rgba(94,53,177,.08);
  border-radius:999px;
  padding:6px 16px;
  white-space:nowrap;
}
.tag::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--hot-orange);
  flex-shrink:0;
}
.chapter-index{display:flex;align-items:baseline;gap:14px;margin-bottom:8px;flex-wrap:wrap}
.chapter-num{
  font-family:var(--accent-font);
  font-size:clamp(2.5rem,6vw,4.5rem);
  font-weight:700;
  line-height:1;
  color:var(--hot-orange);
  letter-spacing:-.03em;
}
.chapter-title{
  font-family:var(--heading-font);
  font-size:clamp(1rem,2.4vw,1.5rem);
  font-weight:900;
  text-transform:uppercase;
  color:var(--deep-green);
  letter-spacing:.04em;
}
.aside-note{
  position:relative;
  padding-left:16px;
  border-left:3px solid var(--track-orange);
  font-family:var(--accent-font);
  font-size:.8125rem;
  line-height:1.8;
  color:rgba(27,59,31,.65);
}

/* ---------- 4. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border-radius:999px;
  padding:12px 28px;
  font-weight:700;
  font-size:.9375rem;
  letter-spacing:.04em;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .35s var(--transition),box-shadow .35s var(--transition),background .3s,color .3s,border-color .3s;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{
  background:var(--hot-orange);
  color:var(--white);
  box-shadow:0 6px 20px rgba(255,87,34,.28);
}
.btn-primary:hover{
  background:#E64A19;
  box-shadow:0 10px 28px rgba(255,87,34,.38);
}
.btn-outline{
  border:2px solid var(--night-purple);
  color:var(--night-purple);
  background:transparent;
}
.btn-outline:hover{
  background:var(--night-purple);
  color:var(--white);
}
.nav-cta::after,.nav-cta-mobile::after{
  content:"↓";
  font-weight:700;
  font-size:.9em;
}

/* ---------- 5. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--accent-font);
  font-size:.8125rem;
  letter-spacing:.04em;
  color:rgba(27,59,31,.6);
  padding:16px 0;
}
.breadcrumb a{color:var(--pitch-green);font-weight:700}
.breadcrumb a:hover{color:var(--hot-orange)}
.breadcrumb-sep{opacity:.35}
.breadcrumb-current{color:var(--night-purple);font-weight:700}

/* ---------- 6. 卡片 / 图片容器 ---------- */
.card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:28px;
  box-shadow:var(--shadow-soft);
  border-top:3px solid transparent;
  transition:transform .4s var(--transition),box-shadow .4s var(--transition),border-color .3s;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-strong);
  border-top-color:var(--hot-orange);
}
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-lg);
  background:linear-gradient(135deg,var(--moon-gray) 0%,rgba(94,53,177,.22) 100%);
}
.media-frame img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .6s ease;
}
.media-frame:hover img{transform:scale(1.04)}
.media-frame-16x9{aspect-ratio:16/9}
.media-frame-4x3{aspect-ratio:4/3}
.media-frame-3x2{aspect-ratio:3/2}

/* ---------- 7. Skip Link & Scroll Progress ---------- */
.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:9999;
  background:var(--hot-orange);
  color:var(--white);
  padding:12px 24px;
  border-radius:0 0 12px 12px;
  font-weight:700;
  box-shadow:var(--shadow-strong);
  transition:top .3s ease;
}
.skip-link:focus{top:0}
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:4px;
  z-index:1002;
  background:linear-gradient(90deg,var(--track-orange),var(--hot-orange) 55%,var(--night-purple));
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 8. Header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  background:linear-gradient(180deg,rgba(26,26,46,.62) 0%,rgba(26,26,46,.18) 70%,transparent 100%);
  transition:background .4s var(--transition),box-shadow .4s var(--transition);
}
.site-header.is-scrolled{
  background:rgba(27,59,31,.94);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 8px 32px rgba(26,26,46,.32);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:20px;
  height:var(--header-h);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-icon{
  width:38px;
  height:38px;
  filter:drop-shadow(0 0 10px rgba(255,179,0,.35));
  transition:transform .45s var(--transition);
}
.brand:hover .brand-icon{transform:rotate(-8deg) scale(1.06)}
.brand-name{
  font-family:var(--heading-font);
  font-size:1.375rem;
  font-weight:900;
  font-style:italic;
  color:var(--white);
  letter-spacing:.02em;
  text-transform:uppercase;
  line-height:1;
}
.brand-name em{
  font-family:var(--accent-font);
  font-style:italic;
  font-weight:700;
  color:var(--track-orange);
  font-size:1.05em;
}

/* 导航（桌面） */
.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{position:relative}
.nav-link{
  position:relative;
  display:block;
  padding:10px 14px;
  color:rgba(255,255,255,.88);
  font-size:.875rem;
  font-weight:600;
  letter-spacing:.08em;
  white-space:nowrap;
  transition:color .3s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:4px;
  height:2px;
  background:var(--track-orange);
  border-radius:2px;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .4s var(--transition);
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--track-orange)}

/* CTA & 汉堡 */
.nav-cta{
  margin-left:6px;
  padding:10px 22px;
  font-size:.875rem;
}
.nav-toggle{
  display:none;
  position:relative;
  width:44px;height:44px;
  border-radius:10px;
  flex-shrink:0;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  z-index:1002;
}
.nav-toggle:hover{background:rgba(255,255,255,.16)}
.nav-toggle-line{
  position:absolute;
  left:11px;right:11px;
  height:2px;
  background:var(--white);
  border-radius:2px;
  transition:transform .4s var(--transition),opacity .3s,top .4s var(--transition);
}
.nav-toggle-line:nth-child(1){top:14px}
.nav-toggle-line:nth-child(2){top:21px}
.nav-toggle-line:nth-child(3){top:28px}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){top:21px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){top:21px;transform:rotate(-45deg)}

/* ---------- 9. Footer ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(160deg,var(--deep-green) 0%,var(--dark-purple) 100%);
  color:rgba(255,255,255,.88);
  padding:72px 0 0;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:4px;
  background:linear-gradient(90deg,var(--pitch-green) 0%,var(--night-purple) 45%,var(--hot-orange) 100%);
  z-index:2;
}
.site-footer::after{
  content:"";
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(-45deg,transparent 0 20px,rgba(255,255,255,.02) 20px 21px);
  pointer-events:none;
}
.footer-content{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.1fr 1.6fr;
  gap:56px;
  padding-bottom:56px;
}
.footer-content::after{
  content:"ANBO APP";
  position:absolute;
  right:-20px;
  bottom:-20px;
  font-family:var(--heading-font);
  font-style:italic;
  font-weight:900;
  font-size:clamp(4rem,14vw,11rem);
  line-height:1;
  color:rgba(255,255,255,.035);
  white-space:nowrap;
  pointer-events:none;
  user-select:none;
}
.footer-logo{
  font-family:var(--heading-font);
  font-size:1.5rem;
  font-weight:900;
  font-style:italic;
  color:var(--white);
  text-transform:uppercase;
  letter-spacing:.02em;
}
.footer-logo em{
  font-family:var(--accent-font);
  font-style:italic;
  color:var(--track-orange);
}
.footer-desc{
  margin-top:14px;
  max-width:420px;
  font-size:.875rem;
  line-height:1.8;
  color:rgba(255,255,255,.68);
}
.trust-statement{
  margin-top:24px;
  padding:16px 18px;
  border-left:3px solid var(--track-orange);
  background:rgba(255,255,255,.06);
  border-radius:0 var(--radius-md) var(--radius-md) 0;
  font-size:.8125rem;
  line-height:1.7;
  color:rgba(255,255,255,.72);
  max-width:460px;
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:36px;
}
.footer-heading{
  font-size:.75rem;
  font-family:var(--heading-font);
  text-transform:uppercase;
  letter-spacing:.18em;
  color:var(--track-orange);
  margin-bottom:16px;
  font-weight:900;
}
.footer-link{
  display:block;
  padding:6px 0;
  color:rgba(255,255,255,.78);
  font-size:.875rem;
  transition:color .3s,padding-left .3s;
}
.footer-link:hover{color:var(--white);padding-left:8px}
.footer-contact-item{
  display:flex;
  align-items:flex-start;
  gap:10px;
  padding:5px 0;
  font-size:.875rem;
  line-height:1.6;
  color:rgba(255,255,255,.74);
  font-family:var(--accent-font);
  word-break:break-word;
}
.footer-contact-item::before{
  content:"";
  width:6px;height:6px;
  margin-top:9px;
  background:var(--track-orange);
  border-radius:1px;
  flex-shrink:0;
}
.footer-bottom{
  position:relative;
  z-index:1;
  border-top:1px solid rgba(255,255,255,.12);
  padding:24px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:.8125rem;
  color:rgba(255,255,255,.55);
}
.footer-copy,.footer-icp{margin:0}

/* ---------- 10. Back Top ---------- */
.back-top{
  position:fixed;
  right:28px;bottom:28px;
  z-index:980;
  width:52px;height:52px;
  border-radius:50%;
  background:var(--night-purple);
  color:var(--white);
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 8px 24px rgba(94,53,177,.38);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(16px);
  transition:opacity .35s var(--transition),transform .35s var(--transition),background .3s;
}
.back-top:hover{
  background:var(--pitch-green);
  transform:translateY(-3px);
}
.back-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.back-top-icon{width:20px;height:20px}

/* ---------- 11. 首屏章节海报 ---------- */
.page-hero{
  position:relative;
  min-height:520px;
  display:flex;
  align-items:flex-end;
  padding:calc(var(--header-h) + 56px) 0 72px;
  background:
    radial-gradient(ellipse at 80% 15%,rgba(94,53,177,.45) 0%,transparent 60%),
    radial-gradient(ellipse at 10% 90%,rgba(46,125,50,.6) 0%,transparent 55%),
    linear-gradient(145deg,var(--dark-purple) 0%,var(--deep-green) 75%);
  color:var(--white);
  overflow:hidden;
}
.page-hero::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:linear-gradient(90deg,var(--track-orange),var(--hot-orange),transparent);
}
.page-hero-title{
  font-size:clamp(2rem,6vw,3.75rem);
  font-weight:900;
  font-style:italic;
  text-transform:uppercase;
  color:var(--white);
  line-height:1.05;
}
.page-hero-sub{
  font-family:var(--accent-font);
  font-size:.875rem;
  letter-spacing:.12em;
  color:rgba(255,255,255,.75);
  margin-top:12px;
}

/* ---------- 12. 滚动显现协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(32px);
  transition:opacity .7s ease,transform .7s var(--transition);
  transition-delay:var(--reveal-delay,0s);
  will-change:opacity,transform;
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 13. 响应式 ---------- */
@media(max-width:1200px){
  .grid-narrow{grid-template-columns:1fr;gap:32px}
}
@media(max-width:1023px){
  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    width:min(360px,84vw);
    margin:0;
    z-index:1001;
    background:linear-gradient(160deg,var(--deep-green) 0%,var(--dark-purple) 100%);
    padding:calc(var(--header-h) + 32px) 32px 40px;
    transform:translateX(100%);
    visibility:hidden;
    transition:transform .5s var(--transition),visibility .5s;
    box-shadow:var(--shadow-strong);
    overflow-y:auto;
  }
  .site-nav::before{
    content:"";
    position:absolute;
    inset:0;
    background:repeating-linear-gradient(-45deg,transparent 0 16px,rgba(255,255,255,.04) 16px 17px);
    pointer-events:none;
  }
  .site-nav[data-open]{
    transform:translateX(0);
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-link{
    padding:16px 4px;
    font-size:1.0625rem;
    border-bottom:1px solid rgba(255,255,255,.08);
    color:rgba(255,255,255,.92);
  }
  .nav-link::after{
    left:4px;right:auto;
    width:0;
    transform:none;
    transition:width .4s var(--transition);
  }
  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after{
    width:32px;
    transform:none;
  }
  .nav-link[aria-current="page"]{color:var(--track-orange)}
  .nav-cta{display:none}
  .nav-cta-mobile{
    display:inline-flex;
    margin-top:28px;
    width:100%;
    justify-content:center;
  }
  .nav-toggle{display:block;margin-left:auto}
  .footer-content{grid-template-columns:1fr;gap:44px}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:767px){
  :root{--header-h:60px}
  .header-inner{gap:12px}
  .brand-name{font-size:1.125rem}
  .brand-icon{width:32px;height:32px}
  .site-nav{padding:calc(var(--header-h) + 24px) 24px 32px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .grid-narrow{gap:20px}
  .footer-nav{grid-template-columns:1fr 1fr;gap:28px;padding-right:0}
  .footer-content::after{font-size:5rem;opacity:.04}
  .section{padding-block:40px}
  .back-top{right:16px;bottom:16px;width:46px;height:46px}
}

/* ---------- 14. 可访问性与 Reduced Motion ---------- */
:focus-visible{
  outline:3px solid var(--hot-orange);
  outline-offset:2px;
  border-radius:2px;
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
    transition:none;
  }
}