:root {
  --black: #111111;
  --green: #20a65a;
  --green-dark: #168447;
  --white: #ffffff;
  --background: #f4f4f1;
  --gray: #777777;
  --light-gray: #ddddda;

  --shadow:
    0 12px 30px rgba(0, 0, 0, 0.08);

  --shadow-hover:
    0 18px 42px rgba(0, 0, 0, 0.15);

  --border: 3px solid var(--black);

  --radius: 2px;
}


/* =========================
   基础
========================= */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--black);

  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    "Noto Sans CJK SC",
    Arial,
    sans-serif;

  line-height: 1.6;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}


/* =========================
   顶部
========================= */

.topbar {
  height: 66px;

  padding: 0 28px;

  background: var(--white);

  border-bottom: var(--border);

  display: flex;
  align-items: center;
  justify-content: space-between;

  position: sticky;
  top: 0;

  z-index: 100;
}

.brand,
.github-link {
  display: flex;
  align-items: center;

  height: 100%;

  font-weight: 800;
}

.brand {
  gap: 12px;
  letter-spacing: 0.02em;
}

.brand-logo,
.github-link img {
  width: 36px;
  height: 36px;

  object-fit: cover;

  border: 2px solid var(--black);
}

.github-link {
  gap: 10px;

  padding: 0 8px;

  transition:
    color 0.2s ease,
    transform 0.2s ease;
}

.github-link:hover {
  color: var(--green);
  transform: translateY(-1px);
}


/* =========================
   页面
========================= */

.page {
  width: min(1440px, calc(100% - 40px));

  margin: 30px auto 60px;
}


/* =========================
   第一屏
========================= */

.hero {
  display: grid;

  grid-template-columns:
    minmax(0, 2.35fr)
    minmax(260px, 0.85fr);

  gap: 22px;

  align-items: stretch;
}


/* =========================
   海报
========================= */

.poster-panel {
  min-width: 0;
}

.poster-frame {
  position: relative;

  aspect-ratio: 16 / 9;

  height: auto;

  background: #e9e9e6;

  border: var(--border);

  overflow: hidden;

  box-shadow: var(--shadow);
}

.poster-container {
  width: 100%;
  height: 100%;

  position: relative;

  overflow: hidden;
}

.poster-image {
  width: 100%;
  height: 100%;

  object-fit: cover;

  opacity: 0;

  position: absolute;
  inset: 0;

  transition:
    opacity 0.45s ease,
    transform 0.6s ease;
}

.poster-image.active {
  opacity: 1;
}

.poster-frame:hover .poster-image.active {
  transform: scale(1.015);
}


.poster-loading,
.poster-empty {
  width: 100%;
  height: 100%;

  display: flex;
  align-items: center;
  justify-content: center;

  color: var(--gray);

  font-weight: 700;
}


/* =========================
   海报按钮
========================= */

.poster-button {
  width: 48px;
  height: 72px;

  border: 0;

  background: rgba(255, 255, 255, 0.9);

  color: var(--black);

  position: absolute;

  top: 50%;

  transform: translateY(-50%);

  z-index: 5;

  cursor: pointer;

  font-size: 42px;

  line-height: 1;

  opacity: 0;

  transition:
    opacity 0.2s ease,
    background 0.2s ease,
    color 0.2s ease;
}

.poster-frame:hover .poster-button {
  opacity: 1;
}

.poster-button:hover {
  background: var(--green);
  color: white;
}

.poster-prev {
  left: 0;
}

.poster-next {
  right: 0;
}


/* =========================
   海报指示点
========================= */

.poster-dots {
  display: flex;

  justify-content: center;
  align-items: center;

  gap: 8px;

  padding: 12px 0 0;
}

.poster-dot {
  width: 26px;
  height: 5px;

  border: 0;

  background: #c7c7c3;

  padding: 0;

  cursor: pointer;

  transition:
    width 0.2s ease,
    background 0.2s ease;
}

.poster-dot.active {
  width: 42px;
  background: var(--green);
}


/* =========================
   数据卡片
========================= */

.stats-card {
  height: 100%;

  min-height: 380px;

  background: var(--white);

  border: var(--border);

  box-shadow: var(--shadow);

  display: flex;

  flex-direction: column;

  justify-content: space-between;

  padding: 42px 34px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 18px;

  font-weight: 800;

  letter-spacing: 0.04em;
}

.stat-value {
  margin-top: 15px;

  font-size: clamp(42px, 5vw, 72px);

  line-height: 1;

  font-weight: 900;

  color: var(--green);

  letter-spacing: -0.04em;

  word-break: break-word;
}

.stat-value small {
  font-size: 20px;

  margin-left: 4px;

  letter-spacing: 0;
}

.stat-line {
  width: 100%;

  height: 3px;

  background: var(--black);

  margin: 25px 0 12px;
}

.stat-description {
  color: var(--gray);

  font-size: 13px;

  font-weight: 600;
}


/* =========================
   第二部分
========================= */

.content-grid {
  display: grid;

  grid-template-columns:
    minmax(200px, 0.55fr)
    minmax(0, 2.65fr);

  gap: 22px;

  margin-top: 60px;
}


/* =========================
   标题
========================= */

.section-heading {
  display: flex;

  align-items: flex-start;

  gap: 14px;

  padding-bottom: 18px;

  border-bottom: 3px solid var(--black);

  margin-bottom: 20px;
}

.heading-number {
  color: var(--green);

  font-size: 13px;

  font-weight: 900;

  letter-spacing: 0.05em;
}

.heading-title {
  font-size: 22px;

  font-weight: 900;

  line-height: 1.1;
}

.heading-subtitle {
  margin-top: 4px;

  color: var(--gray);

  font-size: 10px;

  font-weight: 800;

  letter-spacing: 0.15em;
}


/* =========================
   公告
========================= */

.announcement {
  min-width: 0;
}

.markdown-content {
  max-height: 440px;

  overflow-y: auto;

  padding-right: 10px;

  font-size: 14px;
}

.markdown-content::-webkit-scrollbar {
  width: 5px;
}

.markdown-content::-webkit-scrollbar-thumb {
  background: var(--black);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  margin-top: 0;

  line-height: 1.3;
}

.markdown-content h1 {
  font-size: 24px;
}

.markdown-content h2 {
  font-size: 21px;
}

.markdown-content h3 {
  font-size: 18px;
}

.markdown-content p {
  margin: 0 0 15px;
}

.markdown-content ul {
  padding-left: 20px;
}

.markdown-content li {
  margin-bottom: 8px;
}

.markdown-content blockquote {
  margin: 15px 0;

  padding: 10px 14px;

  border-left: 5px solid var(--green);

  background: var(--white);

  color: #555;
}

.markdown-content code {
  padding: 2px 5px;

  background: #e7e7e4;

  font-family:
    "SFMono-Regular",
    Consolas,
    monospace;

  font-size: 0.9em;
}

.markdown-content a {
  color: var(--green);

  text-decoration: underline;

  text-underline-offset: 3px;
}


/* =========================
   项目
========================= */

.projects {
  min-width: 0;
}

.projects-grid {
  display: grid;

  grid-template-columns:
    repeat(3, minmax(0, 1fr));

  gap: 18px;
}

.project-card {
  background: var(--white);

  border: var(--border);

  box-shadow: var(--shadow);

  min-height: 280px;

  display: flex;

  flex-direction: column;

  align-items: center;

  justify-content: center;

  padding: 30px 22px;

  text-align: center;

  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease;
}

.project-card:hover {
  transform: translateY(-7px);

  box-shadow: var(--shadow-hover);

  border-color: var(--green);
}

.project-logo {
  width: 145px;
  height: 145px;

  object-fit: cover;

  border: 3px solid var(--black);

  background: #eee;

  transition:
    transform 0.25s ease,
    border-color 0.25s ease;
}

.project-card:hover .project-logo {
  transform: scale(1.04);

  border-color: var(--green);
}

.project-name {
  margin-top: 22px;

  font-size: 20px;

  font-weight: 900;

  line-height: 1.25;
}

.project-link-label {
  margin-top: 8px;

  color: var(--gray);

  font-size: 11px;

  font-weight: 700;

  letter-spacing: 0.12em;
}


/* =========================
   Footer
========================= */

.footer {
  border-top: var(--border);

  padding: 20px 28px;

  display: flex;

  justify-content: space-between;

  gap: 20px;

  font-size: 11px;

  font-weight: 800;

  letter-spacing: 0.12em;
}


/* =========================
   响应式
========================= */

@media (max-width: 900px) {

  .topbar {
    padding: 0 18px;
  }

  .page {
    width: min(100% - 24px, 760px);

    margin-top: 18px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .stats-card {
    min-height: auto;

    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 30px;

    padding: 28px;
  }

  .content-grid {
    grid-template-columns: 1fr;

    margin-top: 42px;
  }

  .markdown-content {
    max-height: 300px;
  }
}


@media (max-width: 600px) {

  .topbar {
    height: 58px;

    padding: 0 12px;
  }

  .brand {
    gap: 8px;

    font-size: 14px;
  }

  .brand-logo,
  .github-link img {
    width: 30px;
    height: 30px;
  }

  .github-link {
    gap: 6px;

    font-size: 12px;
  }

  .page {
    width: calc(100% - 16px);

    margin-top: 12px;
  }

  .poster-frame {
    aspect-ratio: 16 / 9;
  }

  .poster-button {
    width: 40px;
    height: 58px;

    opacity: 1;

    font-size: 32px;
  }

  .stats-card {
    display: flex;

    gap: 34px;

    padding: 26px 22px;
  }

  .stat-value {
    font-size: 48px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    min-height: 240px;
  }

  .footer {
    padding: 18px 12px;

    flex-direction: column;
  }
}