/* ===== 一边摸鱼一边学习的每一天 · 二次元风格 v2（含动态效果） ===== */
:root{
  --pink:#ff9ecd;
  --pink-deep:#ff6fae;
  --purple:#b79cff;
  --purple-deep:#9b7bff;
  --blue:#8ed6ff;
  --blue-deep:#5bc0ff;
  --ink:#4a3b57;
  --ink-soft:#7a6b86;
  --bg:#fff5fb;
  --card:#ffffff;
  --line:#ffe0f0;
  --shadow:0 10px 30px rgba(255,140,190,.18);
  --radius:22px;
  --maxw:1080px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,"Segoe UI",sans-serif;
  color:var(--ink);
  line-height:1.75;
  overflow-x:hidden;
  background:
    radial-gradient(1200px 600px at 80% -10%, #ffe9f6 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 10%, #eaf3ff 0%, transparent 55%),
    linear-gradient(120deg,#fff5fb,#f3f0ff,#eaf6ff,#fff5fb);
  background-size:200% 200%;
  animation:bgShift 18s ease infinite;
}
@keyframes bgShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}

a{color:var(--purple-deep);text-decoration:none}
img{max-width:100%}

/* ===== 滚动进度条 ===== */
.progress{
  position:fixed;top:0;left:0;height:3px;width:100%;z-index:70;
  transform:scaleX(0);transform-origin:left;
  background:linear-gradient(90deg,var(--pink),var(--purple),var(--blue));
}

/* ===== 导航 ===== */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(10px);
  background:rgba(255,245,251,.7);
  border-bottom:1px solid transparent;
  transition:.3s;
}
.nav.scrolled{background:rgba(255,245,251,.92);border-bottom:1px solid var(--line);box-shadow:0 6px 20px rgba(255,140,190,.12)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 20px;
  display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink);max-width:60%}
.logo-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.logo-mark{
  display:inline-grid;place-items:center;width:38px;height:38px;border-radius:12px;flex:none;
  background:linear-gradient(135deg,var(--pink),var(--purple));
  color:#fff;font-size:20px;box-shadow:var(--shadow);
}
.nav-links{display:flex;gap:26px;font-weight:600}
.nav-links a{color:var(--ink-soft);transition:.2s;position:relative}
.nav-links a:hover{color:var(--pink-deep)}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:3px;border-radius:3px;
  background:linear-gradient(90deg,var(--pink),var(--purple));transition:.25s;
}
.nav-links a:hover::after{width:100%}
.nav-link.active{color:var(--pink-deep)}
.nav-link.active::after{width:100%}
.nav-toggle{display:none;background:none;border:none;font-size:22px;color:var(--ink);cursor:pointer}

/* ===== Hero ===== */
.hero{position:relative;padding:90px 20px 70px;overflow:hidden}
.hero-inner{max-width:var(--maxw);margin:0 auto;position:relative;z-index:2}
.hero-card{
  background:linear-gradient(160deg,#ffffff 0%,#fff0f8 100%);
  border:1px solid var(--line);
  border-radius:32px;padding:0 0 40px;box-shadow:var(--shadow);
  text-align:center;position:relative;overflow:hidden;
}
.hero-banner-wrap{position:relative;width:100%;height:240px;overflow:hidden;border-radius:32px 32px 0 0}
.hero-banner{width:100%;height:100%;object-fit:cover;display:block;transition:transform .6s ease}
.hero-card:hover .hero-banner{transform:scale(1.05)}
.hero-banner-mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,245,251,0) 55%,rgba(255,240,248,.9) 100%)}
.badge{
  display:inline-block;background:#fff;color:var(--pink-deep);
  border:1px solid var(--line);border-radius:999px;
  padding:6px 16px;font-size:13px;font-weight:700;margin:26px 0 14px;
  box-shadow:0 4px 14px rgba(255,140,190,.15);
}
.hero h1{font-size:38px;line-height:1.3;margin-bottom:14px;padding:0 20px}
.grad-text{
  background:linear-gradient(90deg,var(--pink-deep),var(--purple-deep),var(--blue-deep),var(--pink-deep));
  background-size:300% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:shimmer 6s linear infinite;
}
@keyframes shimmer{0%{background-position:0% 50%}100%{background-position:300% 50%}}
.hero-sub{max-width:640px;margin:0 auto 26px;color:var(--ink-soft);font-size:16px;padding:0 20px}
.hero-sub strong{color:var(--ink)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;padding:0 20px}
.scroll-hint{margin-top:30px;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--ink-soft);font-size:13px;font-weight:600;letter-spacing:.04em}
.scroll-arrow{
  width:22px;height:34px;border:2px solid var(--pink-deep);border-radius:14px;position:relative;
  animation:bob 1.8s ease-in-out infinite;
}
.scroll-arrow::before{
  content:"";position:absolute;left:50%;top:7px;width:5px;height:5px;border-radius:50%;
  background:var(--pink-deep);transform:translateX(-50%);animation:dot 1.8s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(7px)}}
@keyframes dot{0%{opacity:.2;top:7px}50%{opacity:1;top:15px}100%{opacity:.2;top:7px}}

/* 按钮 */
.btn{
  display:inline-block;padding:12px 26px;border-radius:999px;font-weight:700;
  font-size:15px;cursor:pointer;transition:.2s;border:2px solid transparent;
}
.btn-primary{
  background:linear-gradient(135deg,var(--pink),var(--purple));color:#fff;
  box-shadow:0 8px 20px rgba(255,120,180,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,120,180,.45)}
.btn-ghost{background:#fff;color:var(--purple-deep);border-color:var(--purple)}
.btn-ghost:hover{transform:translateY(-2px);background:#faf5ff}
.btn-disabled{background:#f1e9f5;color:#b3a6bd;cursor:not-allowed}

/* 背景装饰（视差） */
.blob{position:absolute;border-radius:50%;filter:blur(40px);opacity:.55;z-index:1;transition:transform .2s ease-out;will-change:transform}
.blob-1{width:320px;height:320px;background:var(--pink);top:-60px;right:8%}
.blob-2{width:280px;height:280px;background:var(--blue);bottom:-80px;left:4%}
.blob-3{width:220px;height:220px;background:var(--purple);top:30%;left:42%}
.sparkle{position:absolute;color:var(--pink-deep);font-size:22px;z-index:2;animation:float 4s ease-in-out infinite}
.s1{top:18%;left:12%}.s2{top:24%;right:14%;animation-delay:.6s}
.s3{bottom:20%;left:20%;animation-delay:1.2s}.s4{bottom:26%;right:20%;animation-delay:1.8s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* ===== 滚动揭示动画（仅在 JS 启用时隐藏） ===== */
.js .reveal{opacity:0;transform:translateY(34px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.js .reveal.in{opacity:1;transform:none}
/* 卡片错峰入场 */
.js .card-grid .tip-card:nth-child(1){transition-delay:.05s}
.js .card-grid .tip-card:nth-child(2){transition-delay:.12s}
.js .card-grid .tip-card:nth-child(3){transition-delay:.19s}
.js .card-grid .tip-card:nth-child(4){transition-delay:.26s}
.js .card-grid .tip-card:nth-child(5){transition-delay:.33s}
.js .card-grid .tip-card:nth-child(6){transition-delay:.40s}

/* ===== Section ===== */
.section{max-width:var(--maxw);margin:0 auto;padding:64px 20px}
/* 锚点跳转避开吸顶导航 */
#tips,#docs,#history,#about{scroll-margin-top:84px}
.section-alt{
  max-width:none;background:linear-gradient(180deg,rgba(255,247,252,.6),rgba(243,240,255,.6));
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.section-alt > *{max-width:var(--maxw);margin-left:auto;margin-right:auto}
.section-head{text-align:center;margin-bottom:36px}
.section-head h2{font-size:28px;margin-bottom:10px}
.sec-emoji{margin-right:6px}
.section-desc{max-width:720px;margin:0 auto;color:var(--ink-soft);font-size:15px}

/* 技巧卡片 */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tip-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:0 6px 18px rgba(255,140,190,.10);transition:.25s;position:relative;overflow:hidden;
}
.tip-card::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1px;
  background:linear-gradient(135deg,var(--pink),var(--purple));
  -webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.25s;
}
.tip-card:hover{transform:translateY(-8px);box-shadow:0 18px 38px rgba(255,120,180,.26)}
.tip-card:hover::before{opacity:1}
.tip-tag{
  display:inline-block;font-size:12px;font-weight:800;padding:4px 12px;border-radius:999px;margin-bottom:12px;
}
.tag-pink{background:#ffe3f1;color:var(--pink-deep)}
.tag-purple{background:#efe7ff;color:var(--purple-deep)}
.tag-blue{background:#e2f4ff;color:var(--blue-deep)}
.tip-card h3{font-size:18px;margin-bottom:10px}
.tip-card p{color:var(--ink-soft);font-size:14px;margin-bottom:14px}
.tip-card p strong{color:var(--ink)}
.src-link{font-size:13px;font-weight:600;color:var(--purple-deep);word-break:break-all}
.src-link:hover{text-decoration:underline}

/* 资料库 Tabs */
.tabs{display:flex;gap:12px;justify-content:center;margin-bottom:26px;flex-wrap:wrap}
.tab-btn{
  padding:10px 24px;border-radius:999px;border:2px solid var(--line);
  background:#fff;color:var(--ink-soft);font-weight:700;cursor:pointer;transition:.2s;font-size:15px;
}
.tab-btn.active{background:linear-gradient(135deg,var(--pink),var(--purple));color:#fff;border-color:transparent;box-shadow:var(--shadow)}
.tab-panel{display:none}
.tab-panel.active{display:block;animation:fade .4s ease}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* 表格（全量显示：自适应宽度 + 自动换行 + 粘性表头 + 斑马纹） */
.table-wrap{
  border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);
  background:#fff;
}
.spec-table{width:100%;border-collapse:collapse;font-size:14px;table-layout:auto}
.spec-table th{
  position:sticky;top:68px;z-index:6;
  background:linear-gradient(135deg,#fff0f8,#f1ecff);color:var(--ink);
  text-align:left;padding:14px 16px;font-weight:800;border-bottom:2px solid var(--line);
  white-space:nowrap;box-shadow:0 2px 0 rgba(255,224,240,.95);
}
.spec-table th:first-child{border-top-left-radius:calc(var(--radius) - 2px)}
.spec-table th:last-child{border-top-right-radius:calc(var(--radius) - 2px)}
.spec-table td{
  padding:13px 16px;border-bottom:1px solid #f6eaf3;color:var(--ink-soft);
  word-break:break-word;vertical-align:top;
}
.spec-table tbody tr{transition:background .2s}
.spec-table tbody tr:nth-child(even){background:#fffafd}
.spec-table tbody tr:hover{background:#fff0f8}
.spec-table tbody tr:last-child td{border-bottom:none}
.spec-table tbody tr:last-child td:first-child{border-bottom-left-radius:calc(var(--radius) - 2px)}
.spec-table tbody tr:last-child td:last-child{border-bottom-right-radius:calc(var(--radius) - 2px)}
.spec-table td strong{color:var(--ink);font-weight:800}
.ref-note{margin-top:16px;font-size:13px;color:var(--ink-soft);text-align:center}
.ref-note a{font-weight:600}
.info-card{
  margin-top:18px;background:#fff;border:1px dashed var(--purple);border-radius:18px;
  padding:16px 18px;font-size:14px;color:var(--ink-soft);
}
.info-card strong{color:var(--purple-deep)}
.pinout-card{
  margin-top:18px;background:linear-gradient(160deg,#ffffff,#f3f0ff);
  border:1px solid var(--line);border-radius:18px;padding:16px 18px;font-size:14px;color:var(--ink-soft);
}
.pinout-card strong{display:block;color:var(--purple-deep);margin-bottom:10px}
.pinout-list{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:8px 18px}
.pinout-list li{padding:4px 0;border-bottom:1px dashed #efe2f3}
.pinout-list b{
  display:inline-grid;place-items:center;width:22px;height:22px;margin-right:8px;border-radius:6px;
  background:#efe7ff;color:var(--purple-deep);font-size:12px;
}

/* 关于 */
.about-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;box-shadow:0 6px 18px rgba(255,140,190,.10)}
.about-card p{color:var(--ink-soft);font-size:15px;margin-bottom:10px}
.about-card strong{color:var(--ink)}
.muted{color:#a99cb3;font-size:13px}

/* 页脚 */
.footer{background:#fff0f8;border-top:1px solid var(--line);margin-top:30px}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:30px 20px;text-align:center}
.footer-brand{font-weight:800;font-size:18px;color:var(--ink);display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:8px}
.copyright{color:var(--ink-soft);font-size:13px;margin-bottom:10px}
.beian{font-size:14px;margin-top:4px}
.beian a{
  color:var(--ink-soft);font-weight:600;
  border:1px solid var(--line);border-radius:8px;padding:5px 14px;display:inline-block;
  background:#fff;transition:.2s;
}
.beian a:hover{color:var(--pink-deep);border-color:var(--pink);text-decoration:none}

/* 回到顶部 */
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:60;
  width:46px;height:46px;border-radius:50%;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--pink),var(--purple));color:#fff;font-size:20px;font-weight:800;
  box-shadow:0 8px 20px rgba(255,120,180,.4);
  opacity:0;transform:translateY(20px) scale(.8);pointer-events:none;transition:.3s;
}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:880px){
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:30px}
  .hero-banner-wrap{height:190px}
  .pinout-list{grid-template-columns:1fr}
}
@media (max-width:620px){
  .nav-links{
    position:absolute;top:62px;right:14px;flex-direction:column;gap:14px;
    background:#fff;padding:18px 22px;border-radius:16px;box-shadow:var(--shadow);
    border:1px solid var(--line);display:none;
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .card-grid{grid-template-columns:1fr}
  .hero-card{padding-bottom:30px}
  .hero h1{font-size:24px}
  .hero-banner-wrap{height:150px}
  .logo{font-size:15px;max-width:70%}
}

/* 章节标题渐变下划线 */
.section-head h2{position:relative;display:inline-block}
.section-head h2::after{
  content:"";display:block;width:54px;height:4px;margin:10px auto 0;border-radius:4px;
  background:linear-gradient(90deg,var(--pink),var(--purple),var(--blue));
}

/* ===== 计算机简史 时间线 ===== */
.timeline{position:relative;max-width:880px;margin:10px auto 0;padding:10px 0}
.timeline::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:3px;transform:translateX(-50%);
  background:linear-gradient(var(--pink),var(--purple),var(--blue));border-radius:3px;
}
.tl-item{position:relative;width:50%;padding:14px 38px}
.tl-item:nth-child(odd){left:0;text-align:right}
.tl-item:nth-child(even){left:50%}
.tl-dot{
  position:absolute;top:24px;width:16px;height:16px;border-radius:50%;z-index:2;
  background:linear-gradient(135deg,var(--pink),var(--purple));
  box-shadow:0 0 0 4px #fff,0 4px 10px rgba(255,120,180,.4);
}
.tl-item:nth-child(odd) .tl-dot{right:-8px}
.tl-item:nth-child(even) .tl-dot{left:-8px}
.tl-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;
  box-shadow:0 6px 18px rgba(255,140,190,.10);transition:.25s;position:relative;
}
.tl-card::after{
  content:"";position:absolute;top:23px;width:30px;height:2px;border-radius:1px;
  background:linear-gradient(90deg,var(--line),var(--pink));opacity:.8;
}
.tl-item:nth-child(odd) .tl-card::after{left:100%;margin-left:8px;background:linear-gradient(90deg,var(--pink),var(--line))}
.tl-item:nth-child(even) .tl-card::after{right:100%;margin-right:8px;background:linear-gradient(90deg,var(--line),var(--pink))}
.tl-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(255,120,180,.22)}
.tl-year{display:inline-block;font-weight:800;color:var(--pink-deep);font-size:15px;margin-bottom:4px}
.tl-card h3{font-size:17px;margin-bottom:6px}
.tl-card p{color:var(--ink-soft);font-size:14px}
@media (max-width:620px){
  .timeline::before{left:18px}
  .tl-item{width:100%;left:0 !important;text-align:left !important;padding:14px 0 14px 46px}
  .tl-item .tl-dot{left:10px !important;right:auto !important}
  .tl-card::after{display:none}
}

/* 窄屏：表格过窄时恢复横向滚动，表头转静态避免裁切 */
@media (max-width:780px){
  .table-wrap{overflow-x:auto;border-radius:var(--radius)}
  .spec-table{min-width:620px}
  .spec-table th{position:static;box-shadow:none}
}

/* 备案号复制按钮 */
.copy-beian{
  margin-left:8px;padding:3px 10px;border:1px solid var(--line);border-radius:8px;
  background:#fff;color:var(--purple-deep);font-size:12px;font-weight:700;cursor:pointer;
  transition:.2s;vertical-align:middle;
}
.copy-beian:hover{border-color:var(--pink);color:var(--pink-deep)}
.copy-beian.done{background:var(--purple);color:#fff;border-color:transparent}

/* ===== 键盘可访问性：聚焦轮廓 ===== */
.tab-btn:focus-visible,
.nav-links a:focus-visible,
.btn:focus-visible,
.copy-beian:focus-visible,
.to-top:focus-visible{
  outline:3px solid var(--purple-deep);outline-offset:2px;
}
.nav-toggle:focus-visible{outline:3px solid var(--purple-deep);outline-offset:2px;border-radius:8px}

/* ===== 可访问性：尊重减弱动效偏好 ===== */
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important}
  .js .reveal{opacity:1 !important;transform:none !important}
  html{scroll-behavior:auto}
}