:root {
  --course-black: #080808;
  --course-ink: #20242a;
  --course-muted: #5e6770;
  --course-paper: #f5f6f7;
  --course-white: #ffffff;
  --course-red: #ed1c24;
  --course-red-dark: #b80f16;
  --course-blue: #176c9b;
  --course-green: #d8e8d2;
  --course-line: #c8cdd2;
  --md-primary-fg-color: #090909;
  --md-primary-fg-color--light: #252525;
  --md-primary-fg-color--dark: #000000;
  --md-accent-fg-color: #ed1c24;
}

* { box-sizing: border-box; }
html { background: var(--course-black); }
body, input {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
body { color: var(--course-ink); background: var(--course-black); }

.md-header {
  background: var(--course-black);
  border: 0;
  box-shadow: none;
  min-height: 3.6rem;
}
.md-header__inner { max-width: 1240px; min-height: 3.6rem; }
.md-header__button.md-logo { padding: .45rem; }
.md-header__button.md-logo img { width: 2rem; height: 2rem; }
.md-header__title { font-weight: 800; letter-spacing: -.02em; }
.md-search__form { border-radius: .25rem; background: #242424; }
.md-search__input { color: #fff; }
.md-search__input::placeholder { color: #aaa; }
.md-tabs {
  background: var(--course-black);
  border-top: 1px solid #242424;
  border-bottom: 1px solid #242424;
}
.md-tabs__inner { max-width: 1240px; }
.md-tabs__link {
  color: #c1c1c1;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .025em;
  opacity: 1;
  padding-top: .8rem;
}
.md-tabs__link:hover, .md-tabs__link--active { color: #fff; }

.md-main {
  background: radial-gradient(circle at 50% -20%, #242424 0, #090909 46%, #050505 100%);
  min-height: calc(100vh - 6rem);
  padding: 2.2rem 1rem 3rem;
}
.md-main__inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem 2.4rem;
  border-radius: 1.7rem;
  background: var(--course-paper);
  box-shadow: 0 18px 60px rgba(0,0,0,.34);
}
.md-content { min-width: 0; }
.md-content__inner { padding-top: 1.8rem; }
.md-content h1 {
  margin: 0 0 1rem;
  color: var(--course-ink);
  font-weight: 900;
  letter-spacing: -.04em;
}
.md-content h2 {
  margin-top: 2rem;
  padding-bottom: .45rem;
  border-bottom: 2px solid var(--course-ink);
  color: var(--course-ink);
  font-weight: 850;
  letter-spacing: -.025em;
}
.md-content h3 { font-weight: 800; color: var(--course-ink); }
.md-content a { color: var(--course-red); font-weight: 650; text-decoration-thickness: 1px; }
.md-content a:hover { color: var(--course-red-dark); }
.md-sidebar { padding-top: 1.5rem; }
.md-sidebar__inner { padding-right: .7rem; }
.md-nav__link--active, .md-nav__link:focus, .md-nav__link:hover { color: var(--course-red); }
.md-nav__title { background: transparent !important; box-shadow: none !important; font-weight: 800; }
.md-footer { background: var(--course-black); }
.md-footer-meta { background: #050505; }

.site-notice {
  margin: 0 auto 1.5rem;
  padding: .9rem 1.1rem;
  border-radius: .35rem;
  background: var(--course-red);
  color: #fff;
  text-align: center;
  font-weight: 800;
}
.site-notice a { color: #fff; text-decoration: underline; }

.course-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(220px, .65fr);
  gap: 2rem;
  align-items: end;
  padding: 1.2rem .3rem 2rem;
}
.course-eyebrow {
  margin-bottom: .65rem;
  color: var(--course-red);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.course-hero h1 {
  max-width: 720px;
  margin: 0 0 1rem;
  font-size: clamp(2.45rem, 5vw, 4.6rem);
  line-height: .98;
  letter-spacing: -.065em;
}
.course-hero .lead {
  max-width: 720px;
  margin: 0;
  color: #555e66;
  font-size: 1.05rem;
  line-height: 1.75;
}
.course-facts {
  border-left: 4px solid var(--course-red);
  padding: .3rem 0 .3rem 1rem;
}
.course-facts strong { display: block; font-size: 1.12rem; }
.course-facts span { display: block; margin-top: .18rem; color: var(--course-muted); font-size: .84rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.35rem; }
.hero-actions a {
  display: inline-block;
  padding: .66rem 1rem;
  border: 2px solid var(--course-ink);
  border-radius: .28rem;
  color: var(--course-ink);
  text-decoration: none;
  font-weight: 850;
}
.hero-actions a.primary { border-color: var(--course-red); background: var(--course-red); color: #fff; }
.hero-actions a:hover { transform: translateY(-1px); }

.metric-grid, .quick-grid, .resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .9rem;
  margin: 1rem 0 1.6rem;
}
.metric-card, .quick-card, .resource-card {
  position: relative;
  min-height: 126px;
  padding: 1.05rem 1.1rem;
  border: 1px solid #d7dade;
  border-top: 5px solid var(--course-ink);
  border-radius: .25rem;
  background: #fff;
  color: var(--course-ink) !important;
  text-decoration: none !important;
}
.metric-card:nth-child(3n+1), .quick-card:first-child, .resource-card:first-child { border-top-color: var(--course-red); }
.metric-card h3, .quick-card h3, .resource-card h3 { margin: 0 0 .45rem; font-size: 1rem; }
.metric-card p, .quick-card p, .resource-card p { margin: 0; color: var(--course-muted); font-size: .84rem; line-height: 1.65; }
.quick-card:hover, .resource-card:hover { border-color: var(--course-red); transform: translateY(-2px); }

.schedule-page { padding-bottom: .5rem; }
.schedule-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  margin: .3rem 0 1.6rem;
  padding: .2rem 0 1.05rem;
  border-bottom: 2px solid var(--course-ink);
}
.schedule-title-wrap { display: flex; align-items: center; gap: .85rem; }
.schedule-icon {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border-radius: .35rem;
  background: var(--course-red);
  color: #fff;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .04em;
}
.schedule-header h1 { margin: 0; font-size: 2.45rem; line-height: 1; }
.schedule-updated { color: var(--course-muted); font-size: .78rem; white-space: nowrap; }
.schedule-intro { max-width: 820px; margin: 0 0 1.15rem; color: #59626a; line-height: 1.75; }
.schedule-wrap { overflow-x: auto; border-radius: .2rem; }
.schedule-table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  color: #292d32;
  font-size: .84rem;
}
.schedule-table th {
  padding: .65rem .55rem;
  border-bottom: 2px solid var(--course-ink);
  color: var(--course-ink);
  text-align: left;
  font-weight: 900;
}
.schedule-table th.resource-head { width: 64px; text-align: center; }
.schedule-table td {
  padding: .75rem .55rem;
  border-bottom: 1px solid #dadde0;
  vertical-align: top;
}
.schedule-table tr:nth-child(even):not(.module-row) td { background: #e5e7e9; }
.schedule-table tr:hover:not(.module-row) td { background: #f0dfdf; }
.schedule-table .date { width: 86px; color: #555d65; white-space: nowrap; }
.schedule-table .topic { width: auto; }
.schedule-table .topic strong { display: block; margin-bottom: .22rem; font-size: .96rem; color: var(--course-ink); }
.schedule-table .topic strong em { color: var(--course-red); font-size: .76rem; font-weight: 750; }
.schedule-meta { display: grid; grid-template-columns: 92px 1fr; gap: .12rem .5rem; margin-top: .2rem; line-height: 1.48; }
.schedule-meta .label { color: #343a40; font-weight: 800; }
.schedule-meta .value { color: #555d65; }
.schedule-table .resource-cell { width: 64px; text-align: center; vertical-align: middle; }
.file-link {
  display: inline-grid;
  min-width: 36px;
  height: 34px;
  place-items: center;
  border-radius: .2rem;
  background: var(--course-red);
  color: #fff !important;
  font-size: .68rem;
  font-weight: 900 !important;
  line-height: 1;
  text-decoration: none !important;
}
.file-link:hover { background: var(--course-red-dark); }
.file-link.detail { background: var(--course-ink); }
.file-link.disabled { background: #b9bec3; cursor: default; }
.module-row td {
  padding: .65rem .55rem;
  border: 0;
  background: var(--course-green);
  color: #566750;
  font-style: italic;
  font-weight: 900;
}
.mobile-schedule { display: none; }
.mobile-module {
  margin: 1.1rem 0 .65rem;
  padding: .55rem .7rem;
  border-left: 5px solid #7da173;
  background: var(--course-green);
  color: #52664d;
  font-size: .78rem;
  font-style: italic;
  font-weight: 900;
}
.mobile-lecture {
  margin-bottom: .75rem;
  padding: .9rem;
  border: 1px solid #d6dade;
  border-left: 5px solid var(--course-ink);
  border-radius: .25rem;
  background: #fff;
}
.mobile-lecture.ready { border-left-color: var(--course-red); }
.mobile-lecture-top { display: flex; align-items: baseline; gap: .6rem; margin-bottom: .55rem; }
.mobile-lecture-no { color: var(--course-muted); font-size: .76rem; white-space: nowrap; }
.mobile-lecture-title { font-weight: 900; }
.mobile-lecture p { margin: .25rem 0; color: #596169; font-size: .8rem; line-height: 1.55; }
.mobile-lecture p strong { color: var(--course-ink); }
.mobile-files { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: .7rem; }
.mobile-files a { display: inline-flex; min-height: 36px; align-items: center; justify-content: center; padding: .38rem .65rem; border-radius: .2rem; background: var(--course-red); color: #fff !important; font-size: .72rem; font-weight: 900 !important; text-decoration: none !important; }
.mobile-files a.detail { background: var(--course-ink); }

.status { display: inline-block; padding: .15rem .48rem; border-radius: 999px; font-size: .7rem; font-weight: 800; white-space: nowrap; }
.status-ready { color: #17644f; background: #def2e9; }
.status-plan { color: #77551a; background: #faeccd; }
.status-archive { color: #5d646b; background: #e8ebed; }
.downloads { display: flex; flex-wrap: wrap; gap: .65rem; margin: 1rem 0; }
.downloads a { padding: .58rem .86rem; border: 2px solid var(--course-red); border-radius: .24rem; text-decoration: none; font-weight: 850; }
.downloads a:first-child { background: var(--course-red); color: #fff; }
.notice { margin: 1rem 0; padding: .85rem 1rem; border-left: 5px solid var(--course-red); background: #f6e5e6; }
.small-note { margin: .4rem 0 .8rem; color: var(--course-muted); font-size: .77rem; }
.simple-hero { border-bottom: 2px solid var(--course-ink); }
.home-section { padding: 1.25rem 0 1.55rem; border-bottom: 1px solid #cfd3d6; }
.home-section:last-child { border-bottom: 0; }
.home-section h2 { margin: 0 0 1rem; padding: 0; border: 0; font-size: 1.35rem; }
.home-section p { max-width: 900px; color: #4f5860; line-height: 1.8; }
.course-info-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 2rem; }
.course-info-list > div { display: grid; grid-template-columns: 120px 1fr; gap: .8rem; padding: .7rem 0; border-top: 1px solid #d8dcdf; }
.course-info-list strong { color: var(--course-ink); }
.course-info-list span { color: #505960; }
.course-outline { margin: 0; padding: 0; list-style: none; counter-reset: course-part; }
.course-outline li { display: grid; grid-template-columns: 250px 1fr; gap: 1.2rem; padding: .85rem 0; border-top: 1px solid #d8dcdf; counter-increment: course-part; }
.course-outline li strong::before { content: "0" counter(course-part) " · "; color: var(--course-red); }
.course-outline li span { color: #566068; }
.simple-course-table, .assignment-table { width: 100%; border-collapse: collapse; }
.simple-course-table th, .assignment-table th { padding: .7rem .6rem; border-bottom: 2px solid var(--course-ink); text-align: left; }
.simple-course-table td, .assignment-table td { padding: .75rem .6rem; border-bottom: 1px solid #d5d9dc; }
.simple-course-table tr:nth-child(even) td, .assignment-table tr:nth-child(even) td { background: #e6e8ea; }
.assignment-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; margin-bottom: 1.25rem; padding-bottom: 1rem; border-bottom: 2px solid var(--course-ink); }
.assignment-head h1 { margin: 0; }
.assignment-note { color: var(--course-muted); font-size: .8rem; }
.mobile-assignment-list { display: none; }
.mobile-assignment { margin-bottom: .25rem; padding: .85rem .7rem .9rem; border: 0; border-bottom: 1px solid #cdd2d5; border-left: 4px solid var(--course-red); background: transparent; }
.mobile-assignment-top { display: flex; justify-content: space-between; gap: .8rem; }
.mobile-assignment-top span { color: var(--course-muted); font-size: .7rem; white-space: nowrap; }
.mobile-assignment p { margin: .45rem 0; color: #535c64; font-size: .82rem; line-height: 1.55; }
.mobile-assignment small { color: var(--course-ink); font-weight: 700; }
.faq-list { width: 100%; }
.faq-item { margin: 0 !important; padding: 0; border: 0 !important; border-top: 1px solid #c4c9cd !important; border-radius: 0 !important; box-shadow: none !important; background: transparent !important; }
.faq-item:last-child { border-bottom: 1px solid #c4c9cd !important; }
.faq-item summary { padding: 1rem .2rem !important; color: var(--course-ink) !important; background: transparent !important; font-size: 1rem !important; font-weight: 850 !important; cursor: pointer; }
.faq-item summary::before { color: var(--course-red) !important; background: transparent !important; }
.faq-item[open] summary { border-bottom: 1px solid #e0e2e4; }
.faq-item p, .faq-item ul { margin: 0; padding: .85rem .2rem 1.05rem; color: #414a52; font-size: .95rem; line-height: 1.75; }

.md-typeset table:not([class]) { border: 0; box-shadow: none; }
.md-typeset table:not([class]) th { background: var(--course-ink); color: #fff; }
.md-typeset table:not([class]) tr:nth-child(even) { background: #e7e9eb; }

@media (max-width: 960px) {
  .md-main { padding: 1rem .55rem 2rem; }
  .md-main__inner { padding: 0 1rem 1.8rem; border-radius: 1.15rem; }
  .course-hero { grid-template-columns: 1fr; padding-top: .6rem; }
  .course-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; border-left: 0; border-top: 4px solid var(--course-red); padding: 1rem 0 0; }
  .metric-grid, .quick-grid, .resource-grid { grid-template-columns: 1fr; }
  .schedule-header { align-items: flex-start; }
  .schedule-updated { margin-top: .35rem; }
}

@media (max-width: 600px) {
  .md-main { padding-left: .35rem; padding-right: .35rem; }
  .md-main__inner { padding: 0 .78rem 1.4rem; }
  .site-notice { padding: .72rem .8rem; font-size: .78rem; }
  .course-hero { gap: 1rem; padding-bottom: 1.15rem; }
  .course-hero h1 { font-size: 2.1rem; }
  .course-hero .lead { font-size: .9rem; line-height: 1.58; }
  .course-facts { grid-template-columns: 1fr; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .hero-actions a { text-align: center; padding-left: .4rem; padding-right: .4rem; }
  .hero-actions .primary { grid-column: 1 / -1; }
  .course-info-list { grid-template-columns: 1fr; }
  .course-info-list > div { grid-template-columns: 100px 1fr; }
  .course-outline li { grid-template-columns: 1fr; gap: .3rem; }
  .simple-course-table { font-size: .78rem; }
  .simple-course-table th, .simple-course-table td { padding: .6rem .38rem; }
  .assignment-table { display: none; }
  .mobile-assignment-list { display: block; }
  .assignment-head { display: block; }
  .assignment-note { margin-top: .5rem; }
  .schedule-header { display: block; }
  .schedule-title-wrap { align-items: center; }
  .schedule-header h1 { font-size: 1.9rem; }
  .schedule-updated { display: block; margin: .65rem 0 0 3.85rem; }
  .schedule-intro { font-size: .88rem; }
  .schedule-wrap, .schedule-page > .small-note { display: none; }
  .mobile-schedule { display: block; }
}