/* 软考高级备考指南 — 科技风视觉 */
:root{
  --bg:#070d12;
  --bg-2:#0b141b;
  --surface:rgba(18,29,38,.72);
  --surface-solid:#111d26;
  --ink:#e9f3f7;
  --ink-2:#a8bcc7;
  --dim:#6e8794;
  --line:rgba(94,213,178,.16);
  --line-2:rgba(255,255,255,.07);
  --neon:#3ee8b0;
  --neon-2:#25c8f0;
  --neon-dim:rgba(62,232,176,.12);
  --warn:#ffc46b;
  --warn-soft:rgba(255,196,107,.09);
  --radius:14px;
  --wrap:1120px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);
  background:var(--bg);
  font:16px/1.78 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  position:relative;overflow-x:hidden;
}
/* 全局背景：网格 + 两团光晕 */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 600px at 12% -5%,rgba(37,200,240,.13),transparent 60%),
    radial-gradient(800px 700px at 92% 8%,rgba(62,232,176,.11),transparent 62%),
    radial-gradient(700px 700px at 60% 105%,rgba(37,200,240,.07),transparent 60%),
    var(--bg);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(rgba(94,213,178,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(94,213,178,.055) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,.25) 45%,transparent 85%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,.25) 45%,transparent 85%);
}
img{max-width:100%}
a{color:var(--neon);text-decoration:none}
a:hover{color:#7df3ce;text-decoration:none;border-bottom:1px solid rgba(62,232,176,.5)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px;position:relative}

/* ---------- 导航 ---------- */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(7,13,18,.78);backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:8px;height:64px}
.brand{display:flex;align-items:baseline;gap:9px;font-weight:700;font-size:17px;color:var(--ink);margin-right:auto}
.brand:hover{border:0}
.brand span{font-family:var(--mono);font-size:10px;font-weight:500;color:var(--neon);letter-spacing:.18em;opacity:.75}
.nav a.item{
  padding:8px 13px;border-radius:9px;font-size:14.5px;color:var(--ink-2);white-space:nowrap;
  border:1px solid transparent;transition:.18s;
}
.nav a.item:hover{background:var(--neon-dim);color:var(--neon);border-color:var(--line)}
.nav a.item[aria-current="page"]{
  color:#031611;font-weight:600;
  background:linear-gradient(135deg,var(--neon),#2ad3c0);
  box-shadow:0 0 18px rgba(62,232,176,.35);
}
#navToggle{display:none;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:9px;
  font-size:19px;line-height:1;padding:7px 12px;cursor:pointer;color:var(--neon)}
@media (max-width:880px){
  .nav{flex-wrap:wrap;height:auto;padding:11px 0}
  #navToggle{display:block}
  #navLinks{display:none;width:100%;flex-direction:column;gap:3px;padding-top:9px}
  #navLinks.open{display:flex}
  .nav a.item{padding:11px 13px}
}
@media (min-width:881px){#navLinks{display:flex;gap:4px}}

/* ---------- Hero ---------- */
main{padding:0 0 80px}
.hero{
  position:relative;overflow:hidden;
  padding:82px 0 76px;margin-bottom:52px;
  border-bottom:1px solid var(--line);
  background:#08131a url("img/hero.jpg") right center/cover no-repeat;
  background-image:image-set(url("img/hero.webp") type("image/webp"),url("img/hero.jpg") type("image/jpeg"));
  background-position:right center;background-size:cover;background-repeat:no-repeat;
}
.hero::before{ /* 左侧压暗，保证文字对比度 */
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(4,10,14,.96) 0%,rgba(5,15,20,.88) 40%,rgba(6,18,24,.55) 68%,rgba(6,18,24,.25) 100%);
}
.hero::after{ /* 扫描线质感 */
  content:"";position:absolute;inset:0;opacity:.5;
  background:repeating-linear-gradient(0deg,rgba(255,255,255,.028) 0 1px,transparent 1px 3px);
}
.hero .wrap{z-index:2}
.hero h1{
  font-size:clamp(27px,4.6vw,44px);line-height:1.28;margin:0 0 16px;letter-spacing:-.015em;
  color:#fff;text-shadow:0 2px 30px rgba(0,0,0,.6);
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(120deg,var(--neon) 10%,var(--neon-2) 90%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{font-size:clamp(15px,2vw,17.5px);color:#b9d0da;max-width:58ch;margin:0 0 26px}
.hero .tagline{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--neon);
  text-transform:uppercase;margin:0 0 18px;font-weight:600;
  border:1px solid var(--line);background:rgba(62,232,176,.07);
  padding:5px 12px;border-radius:20px;
}
.hero .tagline::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--neon);
  box-shadow:0 0 10px var(--neon);animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.8)}}
.hero-cta{display:flex;gap:13px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 24px;border-radius:10px;font-size:15px;font-weight:600;transition:.18s}
.btn:hover{border-bottom:0}
.btn-primary{
  background:linear-gradient(135deg,var(--neon),#22cfc4);color:#04140f;
  box-shadow:0 6px 26px rgba(62,232,176,.3);
}
.btn-primary:hover{color:#04140f;transform:translateY(-2px);box-shadow:0 10px 32px rgba(62,232,176,.42)}
.btn-ghost{border:1px solid rgba(160,220,205,.35);color:#dff6ee;background:rgba(255,255,255,.03)}
.btn-ghost:hover{color:#fff;background:rgba(62,232,176,.12);border-color:var(--neon)}

/* ---------- 内页页头 ---------- */
.page-head{
  position:relative;padding:52px 0 26px;margin-bottom:34px;
  border-bottom:1px solid var(--line);
}
.page-head::before{ /* 顶部装饰性数据条 */
  content:"";position:absolute;left:20px;top:34px;width:46px;height:3px;border-radius:2px;
  background:linear-gradient(90deg,var(--neon),transparent);
}
.page-head h1{font-size:clamp(25px,3.7vw,35px);margin:0 0 12px;letter-spacing:-.01em;color:#fff}
.page-head p{color:var(--ink-2);max-width:72ch;margin:0}

/* 内页图片横幅（可选变体：.page-head.banner + data-img） */
.page-head.banner{
  border-bottom:0;margin-bottom:34px;padding:0;
  border-radius:var(--radius);overflow:hidden;
  background:#07131a;border:1px solid var(--line);
  margin-top:34px;
}
.page-head.banner .banner-media{
  position:relative;
  min-height:210px;
  display:flex;align-items:flex-end;
  padding:26px 26px 24px;
  background:#07131a center/cover no-repeat;
}
.page-head.banner .banner-media::before{ /* 左侧压暗保证可读性 */
  content:"";position:absolute;inset:0;
  background:linear-gradient(95deg,rgba(4,10,14,.95) 0%,rgba(5,14,19,.86) 45%,rgba(6,18,24,.45) 100%);
}
.page-head.banner .banner-media::after{ /* 扫描线 */
  content:"";position:absolute;inset:0;opacity:.45;
  background:repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 3px);
}
.page-head.banner .banner-text{position:relative;z-index:2;max-width:64ch}
.page-head.banner h1{margin:0 0 10px;text-shadow:0 2px 24px rgba(0,0,0,.65)}
.page-head.banner p{margin:0;color:#b9d0da}
.page-head.banner::before{display:none}
@media (max-width:720px){
  .page-head.banner .banner-media{min-height:0;padding:22px 18px 20px}
}

/* 章节插图条 */
.figstrip{
  position:relative;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--line);background:#07131a center/cover no-repeat;
  height:180px;margin:0 0 26px;
}
.figstrip::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,13,18,.15),rgba(7,13,18,.75));
}
.figstrip figcaption{
  position:absolute;left:20px;bottom:16px;z-index:2;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--neon);
}
@media (max-width:720px){.figstrip{height:130px}}

/* ---------- 区块 ---------- */
section.block{margin:0 0 60px}
section.block > h2{
  position:relative;font-size:23px;margin:0 0 8px;padding-left:15px;color:#fff;letter-spacing:-.01em;
}
section.block > h2::before{
  content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:4px;border-radius:3px;
  background:linear-gradient(180deg,var(--neon),var(--neon-2));
  box-shadow:0 0 14px rgba(62,232,176,.55);
}
section.block > .sub{color:var(--dim);font-size:14px;margin:10px 0 24px;padding-left:15px}
h3{font-size:18px;margin:32px 0 9px;color:#fff}
h4{color:#e2f1f5}
p{margin:0 0 15px;color:var(--ink-2)}
p strong,li strong{color:#fff;font-weight:600}
ul,ol{margin:0 0 17px;padding-left:22px;color:var(--ink-2)}
li{margin-bottom:8px}
li::marker{color:var(--neon)}

/* ---------- 卡片 ---------- */
.grid{display:grid;gap:17px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.card{
  position:relative;overflow:hidden;
  background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius);
  padding:23px;backdrop-filter:blur(8px);
}
.card::before{ /* 顶边高光 */
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(62,232,176,.5),transparent);
}
.card h3{margin:0 0 9px;font-size:17px}
.card p:last-child{margin-bottom:0}
.card .tag{
  display:inline-block;font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.12em;
  text-transform:uppercase;
  background:var(--neon-dim);color:var(--neon);border:1px solid var(--line);
  padding:3px 10px;border-radius:20px;margin-bottom:12px;
}
.card .tag.alt{background:var(--warn-soft);color:var(--warn);border-color:rgba(255,196,107,.22)}
a.card{color:inherit;display:block;transition:.2s}
a.card:hover{
  border-color:rgba(62,232,176,.42);transform:translateY(-3px);
  box-shadow:0 14px 40px rgba(0,0,0,.45),0 0 0 1px rgba(62,232,176,.12);
}
a.card:hover h3{color:var(--neon)}
a.card .more{font-family:var(--mono);font-size:12.5px;color:var(--neon);font-weight:600;letter-spacing:.06em}

/* 数据卡 */
.stat{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,rgba(62,232,176,.09),rgba(18,29,38,.7));
  border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;
}
.stat b{
  display:block;font-family:var(--mono);font-size:34px;line-height:1.1;font-weight:700;
  background:linear-gradient(135deg,var(--neon),var(--neon-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  font-variant-numeric:tabular-nums;
}
.stat span{font-size:13px;color:var(--dim);display:block;margin-top:5px}

/* ---------- 表格 ---------- */
.tbl-scroll{
  overflow-x:auto;border:1px solid var(--line-2);border-radius:var(--radius);
  background:var(--surface);backdrop-filter:blur(8px);
}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:560px}
th,td{padding:13px 15px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:top;color:var(--ink-2)}
th{
  background:rgba(62,232,176,.07);font-weight:600;color:var(--neon);font-size:12.5px;
  white-space:nowrap;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;
}
tr:last-child td{border-bottom:0}
tbody tr:hover td{background:rgba(255,255,255,.022)}
td b{color:#fff}

/* ---------- 提示框 ---------- */
.note{
  position:relative;
  border:1px solid var(--line);border-left:3px solid var(--neon);
  background:linear-gradient(100deg,rgba(62,232,176,.09),rgba(62,232,176,.02));
  padding:15px 19px;border-radius:0 10px 10px 0;margin:0 0 22px;font-size:14.5px;color:var(--ink-2);
}
.note.warn{
  border-color:rgba(255,196,107,.2);border-left-color:var(--warn);
  background:linear-gradient(100deg,rgba(255,196,107,.09),rgba(255,196,107,.02));
}
.note b{color:#fff}
.note p:last-child{margin-bottom:0}

/* ---------- 时间线 ---------- */
.timeline{list-style:none;padding:0;margin:0;position:relative}
.timeline::before{
  content:"";position:absolute;left:9px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--neon),rgba(37,200,240,.5),transparent);
}
.timeline li{position:relative;padding:0 0 26px 36px;margin:0}
.timeline li::before{
  content:"";position:absolute;left:2px;top:8px;width:16px;height:16px;border-radius:50%;
  background:var(--bg);border:2px solid var(--neon);
  box-shadow:0 0 12px rgba(62,232,176,.6);
}
.timeline h4{margin:0 0 5px;font-size:16.5px;color:#fff}
.timeline .when{font-family:var(--mono);font-size:11.5px;color:var(--neon-2);font-weight:600;letter-spacing:.1em;text-transform:uppercase}
.timeline p{margin:5px 0 0;font-size:14.5px}

/* ---------- 文章 ---------- */
article.post{
  position:relative;overflow:hidden;
  background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius);
  padding:28px 30px;margin-bottom:22px;backdrop-filter:blur(8px);
}
article.post::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(62,232,176,.45),transparent);
}
article.post > h3{margin-top:0;font-size:21px}
.meta{font-family:var(--mono);font-size:11.5px;color:var(--dim);margin:0 0 18px;letter-spacing:.05em}
.meta em{font-style:normal;color:var(--neon);font-weight:600}
blockquote{
  margin:20px 0;padding:14px 20px;
  border-left:2px solid var(--neon-2);border-radius:0 10px 10px 0;
  color:#c7dde6;font-size:15.5px;background:rgba(37,200,240,.06);
}
.do-dont{display:grid;gap:15px;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));margin:20px 0}
.do-dont div{border-radius:12px;padding:17px 19px;font-size:14.5px}
.do-dont .do{background:rgba(62,232,176,.07);border:1px solid rgba(62,232,176,.22)}
.do-dont .dont{background:rgba(255,110,90,.06);border:1px solid rgba(255,110,90,.2)}
.do-dont h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;font-family:var(--mono);text-transform:uppercase}
.do-dont .do h4{color:var(--neon)}
.do-dont .dont h4{color:#ff9078}
.do-dont ul{margin:0;padding-left:20px}

details{
  background:var(--surface);border:1px solid var(--line-2);border-radius:12px;
  padding:15px 19px;margin-bottom:11px;backdrop-filter:blur(8px);transition:.18s;
}
details:hover{border-color:var(--line)}
details summary{cursor:pointer;font-weight:600;color:#fff;font-size:15.5px;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"▸ ";color:var(--neon);font-size:13px}
details[open] summary::before{content:"▾ "}
details[open] summary{margin-bottom:11px;color:var(--neon)}
details p:last-child{margin-bottom:0}

/* ---------- 页脚 ---------- */
footer.site{
  border-top:1px solid var(--line);padding:34px 0;margin-top:48px;
  background:linear-gradient(180deg,rgba(11,20,27,.6),rgba(7,13,18,.9));
}
footer.site p{font-size:13px;color:var(--dim);margin:0 0 7px}
footer.site a{color:var(--dim);border-bottom:1px solid rgba(110,135,148,.4)}
footer.site a:hover{color:var(--neon);border-color:var(--neon)}
footer.site p b{color:var(--ink-2)}
.footer-links{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:14px}
.footer-links a{font-size:13.5px;color:var(--ink-2);border:0;font-family:var(--mono);letter-spacing:.04em}
.footer-links a:hover{color:var(--neon);border:0}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto}
}