/* ══════════════════════════════════════════════
   Linux 三十天 · 琥珀终端 × 技术书籍
   ══════════════════════════════════════════════ */

:root{
  /* 纸感亮色 */
  --paper:    #FAF7F0;
  --surface:  #FFFFFF;
  --raise:    #F3EDE1;
  --ink:      #1A1712;
  --ink-2:    #5C5347;
  --ink-3:    #8C8272;
  --rule:     #E5DCCB;
  --rule-2:   #D2C6AF;
  --amber:    #A34E00;
  --amber-bg: #FBEFDC;
  --term-bg:  #1C1811;
  --term-ink: #EFE3CE;
  --term-cmt: #8A7B62;
  --term-amb: #F0A63C;

  --display: 'Fraunces', 'Songti SC', Georgia, serif;
  --sans: 'Karla', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --measure: 34rem;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:    #131009;
    --surface:  #1B1710;
    --raise:    #241E15;
    --ink:      #F0E7D6;
    --ink-2:    #B3A691;
    --ink-3:    #7D7364;
    --rule:     #2E2719;
    --rule-2:   #40371F;
    --amber:    #F0A63C;
    --amber-bg: #2A1F0C;
    --term-bg:  #0D0B07;
    --term-ink: #EFE3CE;
    --term-cmt: #7A6C55;
    --term-amb: #F0A63C;
  }
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16.5px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
/* 极淡的纸纹 */
body::before{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E");
  opacity:.035;
}
.shell{position:relative;z-index:1}

a{color:inherit}
::selection{background:var(--amber);color:var(--paper)}

/* ── 顶栏 ───────────────────────────── */
.bar{
  border-bottom:1px solid var(--rule);
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:20;
}
.bar-in{
  max-width:64rem;margin:0 auto;padding:14px 28px;
  display:flex;align-items:center;gap:14px;
}
.mark{display:flex;align-items:center;gap:9px;text-decoration:none}
.mark .dot{
  width:9px;height:9px;border-radius:50%;background:var(--amber);
  box-shadow:0 0 10px color-mix(in srgb,var(--amber) 60%,transparent);
  animation:blink 2.6s steps(2,end) infinite;
}
@keyframes blink{0%,72%{opacity:1}73%,100%{opacity:.25}}
.mark span{
  font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;
  text-transform:uppercase;font-weight:600;
}
.bar nav{margin-left:auto;display:flex;gap:22px}
.bar nav a{
  font-family:var(--mono);font-size:12px;letter-spacing:.09em;
  color:var(--ink-3);text-decoration:none;transition:color .2s;
}
.bar nav a:hover{color:var(--amber)}

/* ── 通用容器 ───────────────────────── */
.page{max-width:64rem;margin:0 auto;padding:0 28px 100px}
.narrow{max-width:var(--measure)}

/* ── 首页 hero ──────────────────────── */
.hero{padding:88px 0 56px;border-bottom:1px solid var(--rule)}
.eyebrow{
  font-family:var(--mono);font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--amber);margin-bottom:22px;
}
.hero h1{
  font-family:var(--display);
  font-size:clamp(3.2rem,9vw,6.4rem);
  font-weight:600;line-height:.92;letter-spacing:-.03em;
  font-variation-settings:'SOFT' 0,'WONK' 1,'opsz' 144;
}
.hero h1 em{
  font-style:normal;color:var(--amber);
  font-variation-settings:'SOFT' 40,'WONK' 1,'opsz' 144;
}
.hero .say{
  margin-top:30px;max-width:38rem;font-size:19px;
  color:var(--ink-2);line-height:1.7;
}
.hero .say b{color:var(--ink);font-weight:700}
.stats{
  display:flex;gap:38px;margin-top:38px;flex-wrap:wrap;
}
.stat .n{
  font-family:var(--display);font-size:2.1rem;font-weight:600;
  line-height:1;font-variation-settings:'opsz' 60;
}
.stat .l{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);margin-top:7px;
}

/* ── 目录 ───────────────────────────── */
.toc{padding-top:20px}
.wk{margin-top:52px}
.wk-h{
  display:flex;align-items:baseline;gap:16px;margin-bottom:6px;
  padding-bottom:11px;border-bottom:1px solid var(--rule);
}
.wk-n{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--amber);font-weight:600;
}
.wk-t{font-family:var(--display);font-size:1.35rem;font-weight:600;font-variation-settings:'opsz' 40}
.wk-s{margin-left:auto;font-family:var(--mono);font-size:11.5px;color:var(--ink-3)}

.row{
  display:grid;grid-template-columns:4.6rem 1fr auto;
  align-items:center;gap:20px;
  padding:17px 4px;border-bottom:1px solid var(--rule);
  text-decoration:none;color:inherit;position:relative;
  transition:padding-left .28s cubic-bezier(.2,.8,.3,1);
}
.row .idx{
  font-family:var(--display);font-size:2rem;font-weight:600;
  line-height:1;color:var(--rule-2);
  font-variation-settings:'opsz' 60;
  transition:color .25s;
  font-variant-numeric:tabular-nums;
}
.row .t{font-size:16.5px;font-weight:500;line-height:1.45}
.row .meta{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:var(--ink-3);text-transform:uppercase;white-space:nowrap;
}
/* 可点击的 */
.row.live::before{
  content:'';position:absolute;left:-14px;top:50%;transform:translateY(-50%);
  width:3px;height:0;background:var(--amber);transition:height .28s ease;
}
.row.live:hover{padding-left:14px}
.row.live:hover::before{height:62%}
.row.live:hover .idx{color:var(--amber)}
.row.live .meta{color:var(--amber)}
.row.live:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
/* 未开放的 */
.row.soon{cursor:default;opacity:.5}
.row.soon .t{font-weight:400}

/* ── 文章页 ─────────────────────────── */
.art-head{padding:66px 0 34px;border-bottom:1px solid var(--rule)}
.crumb{
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  color:var(--ink-3);text-decoration:none;
  display:inline-flex;align-items:center;gap:8px;transition:color .2s;
}
.crumb:hover{color:var(--amber)}
.daymark{display:flex;align-items:flex-end;gap:22px;margin-top:26px}
.daymark .big{
  font-family:var(--display);font-size:5rem;font-weight:600;line-height:.8;
  color:var(--amber);font-variation-settings:'SOFT' 20,'WONK' 1,'opsz' 144;
  font-variant-numeric:tabular-nums;
}
.daymark .lbl{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--ink-3);padding-bottom:9px;
}
.art-head h1{
  font-family:var(--display);font-size:clamp(2rem,4.4vw,2.9rem);
  font-weight:600;line-height:1.14;letter-spacing:-.02em;margin-top:22px;
  font-variation-settings:'opsz' 100;max-width:24ch;
}
.art-head .sum{margin-top:18px;font-size:18px;color:var(--ink-2);max-width:40rem}
.art-head .sum b{color:var(--ink);font-weight:700}

article{padding-top:14px}
article h2{
  font-family:var(--display);font-size:1.62rem;font-weight:600;
  margin:56px 0 4px;letter-spacing:-.015em;
  font-variation-settings:'opsz' 60;scroll-margin-top:80px;
}
article h2 code{font-size:1.35rem;background:none;border:none;padding:0;color:var(--amber)}
article h2 + .kick{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:20px;
}
article h3{
  font-size:1.06rem;font-weight:700;margin:34px 0 12px;
  letter-spacing:-.005em;
}
article p{margin:16px 0;max-width:var(--measure)}
article ul,article ol{margin:16px 0 16px 1.15rem;max-width:var(--measure)}
article li{margin:8px 0}
article strong{font-weight:700}
article em{font-style:normal;color:var(--amber);font-weight:600}

/* 行内代码 */
code{
  font-family:var(--mono);font-size:.87em;
  background:var(--raise);border:1px solid var(--rule);
  padding:1.5px 6px;border-radius:3px;
}

/* 终端块 */
.term{
  margin:26px 0;background:var(--term-bg);border-radius:6px;
  overflow:hidden;box-shadow:0 1px 3px rgba(26,23,18,.14),0 10px 30px -14px rgba(26,23,18,.3);
}
.term-t{
  display:flex;align-items:center;gap:9px;
  padding:9px 16px;border-bottom:1px solid rgba(240,166,60,.16);
  font-family:var(--mono);font-size:11px;letter-spacing:.13em;
  color:var(--term-amb);text-transform:uppercase;
}
.term-t::before{
  content:'';width:6px;height:6px;border-radius:50%;
  background:var(--term-amb);box-shadow:0 0 8px var(--term-amb);
}
.term pre{
  margin:0;padding:20px 22px;overflow-x:auto;
  font-family:var(--mono);font-size:14px;line-height:2;
  color:var(--term-ink);
}
.term pre code{background:none;border:none;padding:0;font-size:inherit}
.term .c{color:var(--term-cmt)}
.term .a{color:var(--term-amb)}
.term .p{color:var(--term-cmt);user-select:none}

/* 输出拆解表 */
.dissect{
  margin:24px 0;border:1px solid var(--rule);border-radius:6px;
  overflow:hidden;background:var(--surface);
}
.dissect .hd{
  background:var(--term-bg);padding:16px 20px;
  font-family:var(--mono);font-size:14.5px;color:var(--term-ink);
  overflow-x:auto;white-space:nowrap;
}
.dissect .hd b{color:var(--term-amb);font-weight:400}
.dissect dl{display:grid;grid-template-columns:auto 1fr}
.dissect dt{
  font-family:var(--mono);font-size:13px;color:var(--amber);
  padding:13px 14px 13px 20px;border-top:1px solid var(--rule);
  white-space:nowrap;font-weight:500;
}
.dissect dd{
  padding:13px 20px 13px 0;border-top:1px solid var(--rule);
  font-size:15px;color:var(--ink-2);
}
.dissect dd b{color:var(--ink);font-weight:700}

/* 提示框 */
.note{
  margin:26px 0;padding:18px 22px;border-radius:0 6px 6px 0;
  background:var(--amber-bg);border-left:3px solid var(--amber);
  max-width:var(--measure);
}
.note .h{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--amber);font-weight:600;margin-bottom:8px;
}
.note p{margin:0;max-width:none}
.note p + p{margin-top:10px}

/* 面试 */
.ask{
  margin:30px 0;border:1px solid var(--rule-2);border-radius:6px;
  background:var(--surface);overflow:hidden;max-width:var(--measure);
}
.ask .q{
  padding:16px 22px;background:var(--raise);
  border-bottom:1px solid var(--rule);
  font-family:var(--display);font-size:1.1rem;font-weight:600;
  font-variation-settings:'opsz' 40;
}
.ask .a{padding:18px 22px}
.ask .a p{margin:0;max-width:none}
.ask .a p + p{margin-top:11px}

/* 练习清单 */
.drill{margin:30px 0;max-width:var(--measure)}
.drill li{
  list-style:none;padding:13px 0 13px 34px;position:relative;
  border-bottom:1px solid var(--rule);margin:0;
}
.drill li::before{
  content:'';position:absolute;left:2px;top:19px;
  width:13px;height:13px;border:1.5px solid var(--rule-2);border-radius:3px;
}
.drill{margin-left:0;padding-left:0}

/* 底部导航 */
.pager{
  display:flex;gap:14px;margin-top:70px;padding-top:26px;
  border-top:1px solid var(--rule);
}
.pg{
  flex:1;padding:20px 22px;border:1px solid var(--rule);border-radius:6px;
  text-decoration:none;color:inherit;transition:.22s;background:var(--surface);
}
.pg:hover{border-color:var(--amber);transform:translateY(-2px)}
.pg .d{
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:6px;
}
.pg .n{font-family:var(--display);font-size:1.1rem;font-weight:600;font-variation-settings:'opsz' 40}
.pg.off{opacity:.42;pointer-events:none}
.pg.next{text-align:right}

footer{
  border-top:1px solid var(--rule);margin-top:80px;
  padding:26px 0 60px;
}
.foot-in{
  max-width:64rem;margin:0 auto;padding:0 28px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.06em;
}

/* 入场动画 */
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.anim{animation:rise .6s cubic-bezier(.2,.75,.3,1) both}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}

@media(max-width:640px){
  body{font-size:16px}
  .page,.bar-in,.foot-in{padding-left:20px;padding-right:20px}
  .hero{padding:56px 0 40px}
  .row{grid-template-columns:3.2rem 1fr;gap:14px}
  .row .idx{font-size:1.5rem}
  .row .meta{grid-column:2;font-size:10.5px}
  .stats{gap:26px}
  .daymark .big{font-size:3.6rem}
  .dissect dl{grid-template-columns:1fr}
  .dissect dt{padding-bottom:0;border-top:1px solid var(--rule)}
  .dissect dd{padding-left:20px;border-top:none}
  .pager{flex-direction:column}
}