/* ===== 小服务器大冒险 · 样式 ===== */
:root {
  --bg: #0f1220;
  --bg2: #171b2e;
  --card: #1c2138;
  --line: #2c3354;
  --text: #e8ecf8;
  --dim: #9aa3c0;
  --accent: #6c8cff;
  --accent2: #43d9a3;
  --gold: #ffc857;
  --code: #0a0d1a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(108,140,255,.18), transparent),
    radial-gradient(900px 400px at 10% 110%, rgba(67,217,163,.10), transparent),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}
/* Hero */
.hero { padding: 72px 20px 48px; text-align: center; }
.hero-inner { max-width: 860px; margin: 0 auto; }
.badge {
  display: inline-block; padding: 4px 16px; border-radius: 999px;
  background: rgba(255,200,87,.12); color: var(--gold);
  border: 1px solid rgba(255,200,87,.35); font-size: 14px;
}
.hero h1 { font-size: 46px; margin: 18px 0 10px; letter-spacing: 2px;
  background: linear-gradient(90deg, #8fa8ff, #43d9a3, #8fa8ff);
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: gradFlow 6s linear infinite; }
@keyframes gradFlow { 0% { background-position: 0% 0; } 100% { background-position: 200% 0; } }
.hero .sub { color: var(--dim); font-size: 17px; margin-bottom: 20px; }
.hero-meta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 28px; }
.chip {
  padding: 6px 14px; border-radius: 10px; font-size: 13px;
  background: var(--card); border: 1px solid var(--line); color: var(--dim);
}
.cta {
  display: inline-block; padding: 12px 34px; border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), #4a7dff);
  color: #fff; text-decoration: none; font-size: 17px; font-weight: 600;
  box-shadow: 0 8px 24px rgba(76,125,255,.35); transition: transform .15s;
}
.cta:hover { transform: translateY(-2px); }
.cta.small { padding: 8px 22px; font-size: 14px; margin-top: 14px; }

/* Steps nav */
.steps-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; gap: 6px; overflow-x: auto;
  padding: 10px 16px; background: rgba(15,18,32,.9); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.steps-nav a {
  flex: 0 0 auto; padding: 6px 16px; border-radius: 999px; font-size: 13px;
  color: var(--dim); text-decoration: none; background: var(--card);
  border: 1px solid var(--line); white-space: nowrap;
}
.steps-nav a:hover, .steps-nav a.done { color: var(--accent2); border-color: var(--accent2); }

/* Layout */
main { max-width: 900px; margin: 0 auto; padding: 28px 16px 60px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 28px; margin-bottom: 26px; box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
.card h2 { font-size: 24px; margin-bottom: 12px; }
.card h3 { font-size: 18px; margin: 14px 0 8px; color: var(--accent2); }
.card p { color: var(--dim); margin-bottom: 10px; }
.card b { color: var(--text); }
.tip {
  background: rgba(108,140,255,.08); border-left: 3px solid var(--accent);
  padding: 10px 14px; border-radius: 8px; margin-top: 14px;
}

/* Flow map */
.flow { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin: 22px 0 8px; }
.flow-node {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px 18px; text-align: center; min-width: 130px;
}
.flow-node .dot { display: block; width: 10px; height: 10px; border-radius: 50%; margin: 0 auto 8px; }
.flow-node.you .dot { background: var(--accent); }
.flow-node.server .dot { background: var(--gold); }
.flow-node.world .dot { background: var(--accent2); }
.flow-node small { color: var(--dim); font-size: 12px; }
.flow-arrow { color: var(--dim); font-size: 13px; text-align: center; }

/* Step cards (generated by JS) */
.step {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  margin-bottom: 20px; overflow: hidden;
  transition: border-color .2s;
}
.step:hover { border-color: var(--accent); }
.step-head {
  display: flex; align-items: center; gap: 14px; padding: 18px 22px; cursor: pointer;
}
.step-num {
  flex: 0 0 46px; height: 46px; border-radius: 12px; display: flex;
  align-items: center; justify-content: center; font-size: 20px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #4a7dff); color: #fff;
}
.step-title { flex: 1; font-size: 18px; font-weight: 600; }
.step-check {
  width: 22px; height: 22px; border: 2px solid var(--line); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: transparent;
}
.step.done .step-check { background: var(--accent2); border-color: var(--accent2); color: #052; }
.step-body { padding: 0 22px 22px; display: none; }
.step.open .step-body { display: block; }
.step-body p, .step-body li { color: var(--dim); }
.step-body ol { padding-left: 20px; margin: 8px 0; }
.step-body ol li { margin-bottom: 6px; }

/* Code blocks */
pre { position: relative; margin: 12px 0; }
.codeblock {
  display: block; background: var(--code); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px 18px; overflow-x: auto;
  font-family: "Cascadia Code", Consolas, monospace; font-size: 13.5px;
  color: #cdd6ff; line-height: 1.6; white-space: pre;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px; padding: 3px 10px; font-size: 12px;
  background: var(--card); color: var(--dim); border: 1px solid var(--line);
  border-radius: 8px; cursor: pointer;
}
.copy-btn:hover { color: var(--accent2); border-color: var(--accent2); }

/* Two col & simple list & table */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 720px) { .two-col { grid-template-columns: 1fr; } }
ol.simple { padding-left: 20px; margin: 8px 0; color: var(--dim); }
ol.simple li { margin-bottom: 8px; }
code { background: var(--code); padding: 1px 7px; border-radius: 6px; color: var(--accent2); font-family: Consolas, monospace; font-size: 0.92em; }
table.faq { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; white-space: nowrap; }
table.faq th, table.faq td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--dim); }
table.faq th { color: var(--gold); }

/* Terminal */
.terminal { background: var(--code); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin-top: 14px; }
.term-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: #131629; border-bottom: 1px solid var(--line); }
.t-dot { width: 12px; height: 12px; border-radius: 50%; }
.t-dot.r { background: #ff5f57; } .t-dot.y { background: #febc2e; } .t-dot.g { background: #28c840; }
.term-title { color: var(--dim); font-size: 12px; margin-left: 6px; }
.term-body { padding: 14px 18px; font-family: Consolas, monospace; font-size: 13.5px; color: #9fd6a0; min-height: 160px; max-height: 320px; overflow-y: auto; white-space: pre-wrap; }
.term-input-row { display: flex; align-items: center; padding: 8px 18px 14px; border-top: 1px solid var(--line); }
.prompt { color: var(--accent2); font-family: Consolas, monospace; font-size: 13.5px; margin-right: 8px; white-space: nowrap; }
#termInput { flex: 1; background: transparent; border: none; outline: none; color: #fff; font-family: Consolas, monospace; font-size: 13.5px; }

footer { text-align: center; color: var(--dim); font-size: 13px; padding: 30px 16px 46px; }
.foot-links { margin-top: 8px; }

/* Roadmap */
.roadmap { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.rm-item {
  padding: 12px 16px; border-radius: 12px; background: var(--bg2);
  border: 1px solid var(--line); color: var(--dim);
}
.rm-item.done { border-color: var(--accent2); color: var(--accent2); }

a.link { color: var(--accent); text-decoration: none; border-bottom: 1px dashed var(--accent); }
a.link:hover { color: var(--accent2); }

/* Cheat cards */
.cheats { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.cheat {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 14px; display: flex; flex-direction: column; gap: 4px;
}
.cheat span { color: var(--dim); font-size: 12px; }

/* Checklist */
.checklist { display: flex; flex-direction: column; gap: 8px; margin: 10px 0; }
.checklist div {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 14px; color: var(--dim);
}

/* Diary */
#diary {
  width: 100%; min-height: 110px; margin: 10px 0; padding: 12px;
  background: var(--code); border: 1px solid var(--line); border-radius: 12px;
  color: var(--text); font-size: 14px; resize: vertical; font-family: inherit;
}
.dim { color: var(--dim); font-size: 13px; margin-left: 10px; }

/* Reading progress bar */
#readBar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2)); z-index: 100;
  transition: width .1s;
}

/* Accordion */
.acc-item { border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; overflow: hidden; }
.acc-q {
  padding: 12px 16px; cursor: pointer; font-weight: 600; background: var(--bg2);
}
.acc-q:hover { color: var(--accent); }
.acc-a { padding: 12px 16px; color: var(--dim); display: none; border-top: 1px solid var(--line); }
.acc-item.open .acc-a { display: block; }

/* 滚动浮现 */
.pre-reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.revealed { opacity: 1; transform: none; }

/* 出师卡片 */
.card.grad { background: linear-gradient(135deg, rgba(108,140,255,.15), rgba(67,217,163,.12)), var(--card); border-color: rgba(108,140,255,.4); }

/* 细节 */
::selection { background: var(--accent); color: #fff; }
::-webkit-scrollbar { width: 10px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }
::-webkit-scrollbar-track { background: transparent; }

@media (max-width: 720px) {
  .hero h1 { font-size: 30px; }
  .hero .sub { font-size: 15px; }
  .card { padding: 20px 16px; }
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .checklist div, .cheat, .rm-item { font-size: 14px; word-break: break-word; }
  .cta { padding: 14px 42px; font-size: 18px; width: 100%; text-align: center; }
  .quiz-opt { padding: 10px 16px; font-size: 15px; margin-bottom: 4px; }
  .acc-q { font-size: 15px; padding: 14px 16px; }
  .step-head { padding: 14px 16px; }
  .step-title { font-size: 16px; }
  .codeblock { font-size: 12.5px; padding: 12px 12px; }
  h2 { font-size: 21px; }
}

/* ===== 白天模式 ===== */
body.light {
  --bg: #f4f6fb;
  --bg2: #ffffff;
  --card: #ffffff;
  --line: #d9deec;
  --text: #1d2333;
  --dim: #5a6480;
  --code: #eef1f8;
}
body.light .hero h1 { background: linear-gradient(90deg, #3f66e0, #12a374); -webkit-background-clip: text; background-clip: text; }
body.light .term-body { color: #1d7a3a; }
body.light .steps-nav { background: rgba(244,246,251,.92); }

/* 主题切换按钮 */
#themeBtn {
  position: fixed; left: 16px; bottom: 26px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--line); background: var(--card);
  font-size: 20px; cursor: pointer; box-shadow: 0 6px 18px rgba(0,0,0,.3);
}

#printBtn {
  position: fixed; left: 16px; bottom: 80px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--line); background: var(--card);
  font-size: 18px; cursor: pointer; box-shadow: 0 6px 18px rgba(0,0,0,.3);
}

#shareBtn {
  position: fixed; left: 16px; bottom: 134px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--line); background: var(--card);
  font-size: 18px; cursor: pointer; box-shadow: 0 6px 18px rgba(0,0,0,.3);
}

@media print {
  .steps-nav, #toTop, #themeBtn, #printBtn, #potatoMascot, .terminal, .hero .cta { display: none !important; }
  body { background: #fff; color: #000; }
  .card, .step { border: 1px solid #ccc; box-shadow: none; break-inside: avoid; }
  .step-body { display: block !important; }
}

/* 蹦跶的土豆 */
#potatoMascot {
  position: fixed; right: 18px; bottom: 80px; font-size: 34px; cursor: pointer;
  animation: bounce 2.2s infinite; z-index: 60; filter: drop-shadow(0 4px 8px rgba(0,0,0,.35));
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  30% { transform: translateY(-14px) rotate(-8deg); }
  60% { transform: translateY(0); }
  80% { transform: translateY(-6px) rotate(8deg); }
}

/* Quiz */
.quiz-item { margin-bottom: 14px; }
.quiz-q { color: var(--text); font-weight: 600; margin-bottom: 6px; }
.quiz-opt {
  margin: 3px 6px 3px 0; padding: 6px 14px; border-radius: 10px;
  background: var(--bg2); border: 1px solid var(--line); color: var(--dim); cursor: pointer;
}
.quiz-opt:hover { border-color: var(--accent); }
.quiz-opt.right { border-color: var(--accent2); color: var(--accent2); }
.quiz-opt.wrong { border-color: #e05a5a; color: #e05a5a; }
.quiz-opt.locked { cursor: default; opacity: .85; }

/* Back to top */
#toTop {
  position: fixed; right: 22px; bottom: 26px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--line); background: var(--card);
  color: var(--text); font-size: 18px; cursor: pointer; display: none;
  box-shadow: 0 6px 18px rgba(0,0,0,.4);
}
#toTop:hover { border-color: var(--accent); color: var(--accent); }