/* 软考网络工程师真题练习站 - 全站样式 */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --green: #16a34a;
  --green-bg: #f0fdf4;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --amber: #d97706;
  --text: #1f2937;
  --text-sub: #6b7280;
  --border: #e5e7eb;
  --bg: #f5f7fb;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 14px rgba(37,99,235,.05);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 15px;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
a { color: var(--primary); text-decoration: none; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--text); }
.brand-logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700;
}
.nav { display: flex; gap: 4px; }
.nav a {
  padding: 8px 14px; border-radius: 8px; color: var(--text-sub); font-weight: 500;
}
.nav a:hover { background: var(--primary-light); color: var(--primary); }
.nav a.active { background: var(--primary); color: #fff; }
.nav-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; font-size: 18px; padding: 4px 10px; cursor: pointer; color: var(--text); }

/* ---------- 首页 ---------- */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 55%, #7c3aed 100%);
  color: #fff; padding: 56px 0 64px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -80px; top: -80px;
  width: 340px; height: 340px; border-radius: 50%;
  background: rgba(255,255,255,.08);
}
.hero .container { display: flex; align-items: center; gap: 40px; position: relative; z-index: 1; }
.hero h1 { font-size: 34px; margin-bottom: 12px; letter-spacing: 1px; }
.hero p.sub { font-size: 16px; opacity: .92; max-width: 560px; }
.hero .hero-btns { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero .hero-art { flex-shrink: 0; }
.hero .hero-art svg { display: block; }

.stats-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: -34px; position: relative; z-index: 5; }
.stat-card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px 10px; text-align: center; border: 1px solid var(--border);
}
.stat-card b { display: block; font-size: 26px; color: var(--primary); }
.stat-card span { font-size: 13px; color: var(--text-sub); }

.section { padding: 44px 0 10px; }
.section > h2 { font-size: 22px; margin-bottom: 6px; }
.section > .sec-desc { color: var(--text-sub); margin-bottom: 20px; font-size: 14px; }

.feat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 18px; transition: transform .15s ease, box-shadow .15s ease; display: block; color: var(--text);
}
.feat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); }
.feat-card .icon { font-size: 26px; }
.feat-card h3 { font-size: 16px; margin: 10px 0 6px; }
.feat-card p { font-size: 13px; color: var(--text-sub); }

.exam-info-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.notice {
  background: #fffbeb; border: 1px solid #fde68a; color: #92400e;
  border-radius: 10px; padding: 12px 16px; font-size: 13px; margin-top: 16px;
}

/* ---------- 通用卡片/按钮 ---------- */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.btn {
  display: inline-block; border: none; border-radius: 10px; cursor: pointer;
  padding: 10px 22px; font-size: 14px; font-weight: 600; transition: all .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #f3f4f6; color: var(--text-sub); }
.btn-ghost:hover { background: var(--border); }
.btn-ghost.on { background: var(--red); color: #fff; }
.btn-ok { background: var(--green); color: #fff; }
.btn-no { background: var(--red); color: #fff; }
.btn-sm { padding: 5px 14px; font-size: 13px; border-radius: 8px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.center { text-align: center; }

.badge {
  display: inline-block; background: #f3f4f6; color: var(--text-sub);
  font-size: 12px; padding: 2px 10px; border-radius: 999px; margin-right: 6px;
}
.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge.small { font-size: 11px; padding: 1px 8px; }

.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 16px; }
.toolbar select {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 10px;
  background: #fff; font-size: 14px; color: var(--text); min-width: 180px;
}
.stat-bar {
  display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 14px;
  background: var(--primary-light); border: 1px solid #dbeafe;
  border-radius: 10px; padding: 10px 16px; font-size: 14px; color: var(--primary-dark);
}
.stat-bar b { font-size: 16px; }

/* ---------- 题目 ---------- */
.q-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.q-idx { margin-left: auto; color: var(--text-sub); font-size: 13px; }
.q-text { font-size: 16px; font-weight: 600; margin-bottom: 16px; line-height: 1.8; }
.q-num { color: var(--primary); }
.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: baseline; gap: 10px;
  border: 1.5px solid var(--border); border-radius: 10px;
  padding: 11px 14px; cursor: pointer; transition: all .12s; background: #fff;
}
.opt:hover { border-color: var(--primary); background: var(--primary-light); }
.opt-letter {
  flex-shrink: 0; width: 24px; height: 24px; border-radius: 6px;
  background: #f3f4f6; color: var(--text-sub); font-size: 13px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
}
.opt.correct { border-color: var(--green); background: var(--green-bg); }
.opt.correct .opt-letter { background: var(--green); color: #fff; }
.opt.wrong { border-color: var(--red); background: var(--red-bg); }
.opt.wrong .opt-letter { background: var(--red); color: #fff; }
.opt.disabled { cursor: default; }
.opt.disabled:hover { border-color: inherit; background: inherit; }
.opt.correct.disabled:hover { background: var(--green-bg); border-color: var(--green); }
.opt.wrong.disabled:hover { background: var(--red-bg); border-color: var(--red); }
.opt-radio input { accent-color: var(--primary); margin-top: 5px; }
.judge { margin-top: 14px; font-weight: 700; }
.judge-ok { color: var(--green); }
.judge-no { color: var(--red); }
.explain {
  margin-top: 10px; background: #f8fafc; border: 1px solid var(--border);
  border-left: 4px solid var(--primary); border-radius: 8px;
  padding: 12px 14px; font-size: 14px; color: #374151;
}
.empty { text-align: center; color: var(--text-sub); padding: 50px 0; }
.p-nav { display: flex; align-items: center; justify-content: space-between; margin-top: 18px; }
.p-nav .pos { color: var(--text-sub); font-size: 14px; }
.tools-row { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 模拟考试 ---------- */
.setup-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }
.setup-grid label { font-size: 13px; color: var(--text-sub); display: block; margin-bottom: 6px; }
.setup-grid select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 14px; background: #fff; color: var(--text);
}
.exam-bar {
  position: sticky; top: 60px; z-index: 50;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow); padding: 12px 18px;
  display: flex; align-items: center; gap: 18px; margin-bottom: 18px; flex-wrap: wrap;
}
#exTimer { font-size: 20px; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--primary); }
#exTimer.danger { color: var(--red); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .45; } }
.ex-q { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow); }
.score { font-size: 52px; font-weight: 800; text-align: center; margin: 20px 0 6px; }
.score span { font-size: 22px; color: var(--text-sub); font-weight: 600; }
.score.pass { color: var(--green); }
.score.fail { color: var(--red); }
.score-note { text-align: center; color: var(--text-sub); margin-bottom: 20px; }

/* ---------- 案例解析 ---------- */
.case-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 14px; box-shadow: var(--shadow); overflow: hidden;
}
.case-head {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 16px 20px; cursor: pointer; user-select: none;
}
.case-head:hover { background: var(--primary-light); }
.case-toggle { color: var(--text-sub); font-size: 13px; white-space: nowrap; }
.case-body { padding: 4px 20px 20px; border-top: 1px dashed var(--border); }
.scenario {
  background: #f8fafc; border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; font-size: 14px; white-space: pre-wrap; margin: 14px 0 18px; color: #374151;
}
.case-q { border-left: 3px solid #dbeafe; padding: 4px 0 4px 14px; margin-bottom: 18px; }
.case-q-title { font-weight: 600; margin-bottom: 8px; }
.case-ans pre {
  background: #0f172a; color: #e2e8f0; border-radius: 10px;
  padding: 14px 16px; font-size: 13px; overflow-x: auto;
  font-family: Consolas, "Courier New", monospace; line-height: 1.7;
  white-space: pre-wrap; word-break: break-all;
}
.case-mark { margin-top: 8px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-sub); }

/* ---------- 考点速记 ---------- */
.point-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.chip {
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 14px; font-size: 13px; color: var(--text-sub);
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.point-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.point-card h3 { font-size: 17px; margin-bottom: 14px; color: var(--primary-dark); }
.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.tbl th, .tbl td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.tbl th { background: var(--primary-light); color: var(--primary-dark); white-space: nowrap; }
.tbl tr:nth-child(even) td { background: #fafbfc; }
.kv { list-style: none; }
.kv li { padding: 5px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.kv li:last-child { border-bottom: none; }
.kv b { color: var(--primary-dark); }
.tip {
  margin-top: 12px; background: #fffbeb; border: 1px solid #fde68a;
  border-radius: 8px; padding: 10px 14px; font-size: 13px; color: #92400e;
}

/* ---------- 关于页 ---------- */
.doc h2 { font-size: 19px; margin: 26px 0 10px; color: var(--primary-dark); }
.doc h2:first-child { margin-top: 0; }
.doc p, .doc li { font-size: 14.5px; color: #374151; }
.doc ul, .doc ol { padding-left: 22px; margin: 8px 0; }
.doc li { margin-bottom: 6px; }
details {
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; margin-bottom: 10px; background: #fff;
}
details summary { cursor: pointer; font-weight: 600; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 60px; background: #111827; color: #9ca3af;
  padding: 28px 0; text-align: center; font-size: 13px; line-height: 2;
}
.site-footer a { color: #93c5fd; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero .container { flex-direction: column; text-align: center; }
  .hero h1 { font-size: 26px; }
  .hero .hero-btns { justify-content: center; }
  .hero .hero-art { display: none; }
  .stats-row { grid-template-columns: repeat(3, 1fr); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .setup-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 10px 16px 16px;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: 1fr; }
  .exam-bar { top: 56px; }
  .toolbar select { min-width: 0; flex: 1; }
}