:root {
  --bg: #f7f3ec;
  --text: #1f2933;
  --muted: #667085;
  --card: rgba(255, 255, 255, 0.72);
  --border: rgba(31, 41, 51, 0.12);
  --primary: #1f2933;
  --primary-text: #ffffff;
  --secondary: rgba(31, 41, 51, 0.08);
  --shadow: 0 24px 80px rgba(31, 41, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter,
    "Noto Sans SC",
    "Microsoft YaHei",
    "PingFang SC",
    sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.9), transparent 36%),
    linear-gradient(135deg, #f7f3ec 0%, #eef2f3 100%);
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(247, 243, 236, 0.72);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
}

.nav-links a:hover {
  color: var(--text);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}

.hero {
  min-height: 68vh;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.subtitle {
  margin-top: 24px;
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--border);
}

.button.primary {
  background: var(--primary);
  color: var(--primary-text);
}

.button.secondary {
  background: var(--secondary);
}

.hero-card,
.info-card,
.project-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
}

.card-title {
  font-weight: 800;
  margin-bottom: 16px;
}

.hero-card ul {
  padding-left: 20px;
  margin: 0;
  color: var(--muted);
}

.section {
  padding: 64px 0 0;
}

.section h2 {
  margin: 0 0 18px;
  font-size: 32px;
  letter-spacing: -0.04em;
}

.section > p {
  max-width: 760px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.info-card {
  padding: 22px;
}

.info-card h3,
.project-item h3 {
  margin: 0 0 10px;
}

.info-card p,
.project-item p {
  color: var(--muted);
  margin: 0;
}

.project-list {
  display: grid;
  gap: 16px;
}

.project-item {
  padding: 24px;
}

.inline-link {
  display: inline-flex;
  margin-top: 14px;
  font-weight: 800;
  text-decoration: none;
}

.inline-link:hover {
  text-decoration: underline;
}

.tag {
  display: inline-flex;
  margin-top: 16px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--secondary);
  color: var(--muted);
  font-size: 13px;
}

.contact-section a {
  font-weight: 700;
}

.social-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 18px;
  max-width: 860px;
}

.social-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--card);
  text-decoration: none;
  box-shadow: 0 12px 36px rgba(31, 41, 51, 0.08);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.social-link:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 41, 51, 0.28);
  box-shadow: 0 18px 48px rgba(31, 41, 51, 0.12);
}

.social-label {
  font-size: 14px;
  color: var(--muted);
}

.social-handle {
  overflow-wrap: anywhere;
}

.notes-hero {
  min-height: auto;
  padding: 72px 0 24px;
}

.breadcrumb {
  display: inline-flex;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--text);
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.note-card,
.note-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.note-card {
  display: flex;
  min-height: 188px;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  text-decoration: none;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.note-card:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 41, 51, 0.28);
  box-shadow: 0 18px 48px rgba(31, 41, 51, 0.12);
}

.note-card h3,
.note-panel h3 {
  margin: 0 0 10px;
}

.note-card p,
.note-panel p {
  margin: 0;
  color: var(--muted);
}

.subject-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.note-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
}

.note-panel {
  padding: 24px;
}

.note-slot {
  margin-top: 16px;
  padding: 18px;
  border: 1px dashed var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.42);
}

.note-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.download-placeholder {
  color: var(--muted);
  font-size: 14px;
}

.small {
  font-size: 14px;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 40px;
  }

  .grid,
  .social-links,
  .notes-grid,
  .note-layout {
    grid-template-columns: 1fr 1fr;
  }

  .note-layout {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    gap: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}

@media (max-width: 560px) {
  main {
    padding: 32px 18px 56px;
  }

  .nav {
    padding: 14px 18px;
    flex-direction: column;
  }

  .nav-links {
    gap: 14px;
    justify-content: flex-start;
  }

  .grid,
  .social-links,
  .notes-grid,
  .note-layout {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 44px;
  }
}