:root {
  --ink: #1a2b2e;
  --ink-soft: #3d5559;
  --muted: #6b8186;
  --line: rgba(26, 43, 46, 0.1);
  --paper: #f4f8f7;
  --surface: rgba(255, 255, 255, 0.72);
  --accent: #1f7a6c;
  --accent-deep: #145a50;
  --year: #c45c26;
  --radius: 0;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  background: var(--paper);
  position: relative;
  overflow-x: hidden;
}

.bg-atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 90% 60% at 10% -10%, rgba(120, 190, 176, 0.35), transparent 55%),
    radial-gradient(ellipse 70% 50% at 95% 5%, rgba(180, 210, 220, 0.4), transparent 50%),
    radial-gradient(ellipse 80% 45% at 50% 110%, rgba(232, 196, 160, 0.22), transparent 55%),
    linear-gradient(180deg, #e8f2ef 0%, #f4f8f7 38%, #eef3f1 100%);
}

.bg-atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  pointer-events: none;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 0.5rem;
  animation: rise 0.8s var(--ease) both;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
}

.day-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(8px);
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.nav-btn:hover,
.nav-btn:focus-visible {
  color: var(--accent-deep);
  border-color: rgba(31, 122, 108, 0.35);
  background: rgba(255, 255, 255, 0.9);
  outline: none;
}

.nav-btn span {
  display: inline-block;
  font-size: 1.25rem;
  line-height: 1;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.hero {
  padding: 3.5rem 0 2.75rem;
  animation: rise 0.9s var(--ease) 0.08s both;
}

.hero-kicker {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-date {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 9vw, 4.25rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.hero-lead {
  margin: 0;
  max-width: 28em;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.events {
  animation: rise 1s var(--ease) 0.16s both;
}

.events-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0.25rem;
}

.events-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.events-count {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.events-list {
  display: flex;
  flex-direction: column;
}

.event-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  animation: rise 0.7s var(--ease) both;
}

.event-item:last-child {
  border-bottom: none;
}

.event-year {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--year);
  line-height: 1.2;
  padding-top: 0.15rem;
}

.event-body {
  min-width: 0;
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.35rem;
}

.event-category {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.event-title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.event-summary {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.events-empty {
  margin: 2rem 0 0;
  color: var(--muted);
  text-align: center;
}

.site-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent-deep);
  text-decoration: underline;
  outline: none;
}

.is-loading .events-list,
.is-loading .events-count {
  opacity: 0.45;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 560px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  .event-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .event-year {
    font-size: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}