/* alicsyn.com 课程站 v1 —— 纯静态，无外部依赖 */
:root {
  --ink: #1a2a3a;
  --muted: #5d6f80;
  --navy: #173f5f;
  --teal: #0f7b78;
  --teal-soft: #eaf5f4;
  --amber: #b26a12;
  --amber-soft: #fdf3e3;
  --line: #d9e2e9;
  --wash: #f5f8fa;
  --paper: #ffffff;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
}

/* ---------- 版心 ---------- */
.wrap { max-width: 880px; margin: 0 auto; padding: 0 22px; }
.wrap.wide { max-width: 1080px; }

/* ---------- 导航 ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky; top: 0; z-index: 50;
}
.nav { display: flex; align-items: center; gap: 6px; min-height: 60px; }
.brand {
  font-weight: 800; color: var(--navy); text-decoration: none;
  font-size: 17px; margin-right: auto; white-space: nowrap;
}
.brand small { color: var(--teal); font-weight: 600; font-size: 12px; margin-left: 8px; letter-spacing: .08em; }
.nav a.nl {
  color: var(--muted); text-decoration: none; font-size: 15px;
  padding: 8px 12px; border-radius: 8px; white-space: nowrap;
}
.nav a.nl:hover { color: var(--navy); background: var(--wash); }
.nav a.nl.active { color: var(--teal); font-weight: 700; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #173f5f 0%, #0f5f5c 78%, #0f7b78 100%);
  color: #fff; padding: 72px 0 64px;
}
.hero .kicker {
  color: #9fd4d1; font-size: 13px; font-weight: 700;
  letter-spacing: .22em; margin-bottom: 18px;
}
.hero h1 { font-size: 40px; line-height: 1.35; margin: 0 0 16px; letter-spacing: .02em; }
.hero .lede { font-size: 18px; line-height: 1.9; color: #dcebea; max-width: 640px; margin: 0 0 30px; }
.hero .cta-row { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; text-decoration: none; font-weight: 700;
  padding: 12px 26px; border-radius: 999px; font-size: 15px;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn.primary { background: #fff; color: var(--navy); }
.btn.primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(0,0,0,.18); }
.btn.ghost { border: 1.5px solid rgba(255,255,255,.75); color: #fff; }
.btn.ghost:hover { background: rgba(255,255,255,.12); }
.btn.solid { background: var(--teal); color: #fff; }
.btn.solid:hover { background: #0d6a67; }
.btn.plain { border: 1.5px solid var(--line); color: var(--navy); }
.btn.plain:hover { border-color: var(--teal); color: var(--teal); }

/* ---------- 通用排版 ---------- */
main section.block { padding: 44px 0; }
main section.block + section.block { border-top: 1px solid var(--line); }
.eyebrow { color: var(--teal); font-size: 13px; font-weight: 700; letter-spacing: .2em; margin-bottom: 10px; }
h2.sec { font-size: 27px; line-height: 1.4; color: var(--navy); margin: 0 0 14px; }
h3.sub { font-size: 19px; color: var(--navy); margin: 30px 0 10px; }
p.lead { font-size: 17.5px; color: #33475c; line-height: 1.9; }
ul.tight li, ol.tight li { margin-bottom: 6px; }
li::marker { color: var(--teal); font-weight: 700; }

/* ---------- 卡片 ---------- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; background: #fff;
}
.card h3 { margin: 0 0 8px; color: var(--navy); font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.card.accent { border-top: 3px solid var(--teal); }

/* ---------- 引用 / 提示 / 面板 ---------- */
.quote {
  border-left: 4px solid var(--teal); background: var(--teal-soft);
  padding: 18px 22px; margin: 24px 0; border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 17px; line-height: 1.85; color: #173f5f;
}
.note {
  border-left: 4px solid var(--amber); background: var(--amber-soft);
  padding: 16px 20px; margin: 22px 0; border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
}
.panel {
  background: var(--wash); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 24px; margin: 22px 0;
}
.panel h4 { margin: 0 0 8px; color: var(--navy); font-size: 16px; }
.panel p { margin: 0 0 8px; font-size: 15px; }
.panel p:last-child { margin-bottom: 0; }

/* ---------- 表格 ---------- */
table.spec { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; line-height: 1.7; }
table.spec thead { border-top: 2.5px solid var(--navy); border-bottom: 1.5px solid var(--navy); }
table.spec tbody { border-bottom: 2.5px solid var(--navy); }
table.spec th { text-align: left; color: var(--navy); padding: 10px 12px; }
table.spec td { padding: 10px 12px; vertical-align: top; border-bottom: 1px solid #e6ecef; }
table.spec tbody tr:last-child td { border-bottom: none; }
.scroll-x { overflow-x: auto; }

/* ---------- 大纲日历 ---------- */
.daylist { list-style: none; margin: 20px 0 0; padding: 0; }
.daylist li {
  display: grid; grid-template-columns: 86px 1fr; gap: 14px;
  padding: 13px 4px; border-bottom: 1px solid #e6ecef; align-items: baseline;
}
.daylist li:last-child { border-bottom: none; }
.daylist .dno {
  font-weight: 800; color: var(--teal); font-size: 14px; white-space: nowrap;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.daylist .dt { font-size: 15.5px; }
.daylist .dt strong { color: var(--navy); }
.daylist a { color: inherit; text-decoration: none; border-bottom: 1px dashed var(--teal); }
.daylist a:hover { color: var(--teal); }

/* ---------- 词汇表 ---------- */
.vocab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0; }
.vocab { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.vocab header { padding: 14px 20px; font-weight: 800; font-size: 16px; }
.vocab.active header { background: var(--teal); color: #fff; }
.vocab.recog header { background: var(--wash); color: var(--navy); border-bottom: 1px solid var(--line); }
.vocab ul { list-style: none; margin: 0; padding: 6px 20px 14px; }
.vocab li { padding: 9px 0; border-bottom: 1px solid #edf1f4; font-size: 15px; line-height: 1.75; }
.vocab li:last-child { border-bottom: none; }
.term { font-weight: 700; color: var(--navy); }
.en {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .86em; color: var(--teal); background: var(--teal-soft);
  padding: 1px 7px; border-radius: 5px; white-space: nowrap;
}
code, .mono {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .88em;
}

/* ---------- 步骤条（五阶段） ---------- */
.phases { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin: 22px 0; }
.phase {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 14px; background: #fff; text-align: center;
}
.phase .pn { font-weight: 800; color: var(--teal); font-size: 13px; letter-spacing: .06em; }
.phase .pt { font-weight: 700; color: var(--navy); margin: 6px 0 4px; font-size: 15px; }
.phase p { margin: 0; font-size: 13px; color: var(--muted); line-height: 1.7; }

/* ---------- 页头（内页） ---------- */
.page-hero { background: var(--wash); border-bottom: 1px solid var(--line); padding: 46px 0 38px; }
.page-hero .kicker { color: var(--teal); font-size: 13px; font-weight: 700; letter-spacing: .2em; margin-bottom: 12px; }
.page-hero h1 { font-size: 33px; line-height: 1.4; color: var(--navy); margin: 0 0 12px; }
.page-hero .lede { color: var(--muted); font-size: 16.5px; max-width: 660px; margin: 0; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: #b9c9d6; margin-top: 20px; }
.site-footer .wrap { padding-top: 40px; padding-bottom: 34px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 26px; }
.foot-grid h4 { color: #fff; margin: 0 0 10px; font-size: 15px; }
.foot-grid p, .foot-grid a { font-size: 14px; line-height: 1.9; color: #b9c9d6; text-decoration: none; }
.foot-grid a:hover { color: #fff; text-decoration: underline; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; }
.copyright { border-top: 1px solid rgba(255,255,255,.14); margin-top: 26px; padding-top: 18px; font-size: 13px; color: #8fa3b3; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  body { font-size: 15.5px; }
  .hero { padding: 52px 0 46px; }
  .hero h1 { font-size: 30px; }
  .hero .lede { font-size: 16px; }
  .page-hero h1 { font-size: 26px; }
  h2.sec { font-size: 23px; }
  .cards, .vocab-grid { grid-template-columns: 1fr; }
  .phases { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .nav { flex-wrap: wrap; padding: 10px 0; }
  .brand { width: 100%; margin-bottom: 4px; }
  .daylist li { grid-template-columns: 74px 1fr; }
}
@media (max-width: 420px) {
  .phases { grid-template-columns: 1fr; }
}