:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-alt: #eef3ff;
  --text: #1d2736;
  --muted: #5d6b82;
  --border: #dfe6f1;
  --primary: #1d4f91;
  --primary-dark: #123a6d;
  --shadow: 0 18px 35px rgba(31, 47, 86, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(180deg, #f7f9fc 0%, #edf2f8 100%);
}

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

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
}

p,
ul,
ol {
  margin: 0 0 1rem;
}

ul,
ol {
  padding-left: 1.25rem;
}

li + li {
  margin-top: 0.35rem;
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 246, 251, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  color: var(--primary-dark);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem 1rem;
}

.main-nav a {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
}

.main-nav a:hover,
.main-nav a:focus {
  color: var(--primary);
}

.page-section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.page-section + .page-section {
  border-top: 1px solid var(--border);
}

.page-section .container {
  max-width: 1100px;
}

.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.hero img {
  max-width: 420px;
  margin: 0 auto;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 1rem;
  color: var(--primary-dark);
  line-height: 1.25;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h2 {
  font-size: clamp(1.35rem, 2.3vw, 2rem);
}

h3 {
  font-size: 1.15rem;
}

p,
li,
blockquote {
  font-size: 1.04rem;
  color: var(--text);
}

.lead {
  font-size: 1.05rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.card h2,
.card h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.card > p,
.card > ul,
.card > ol {
  margin-top: 0;
  margin-bottom: 0.45rem;
}

.card ul,
.card ol {
  margin-top: 0.2rem;
  margin-bottom: 0.7rem;
  padding-left: 1.6rem;
  margin-left: 1.25rem;
}

.card li + li {
  margin-top: 0.2rem;
}

.card > ul:last-child,
.card > ol:last-child {
  margin-bottom: 0.2rem;
}

.info-list {
  margin: 0;
  padding-left: 1.2rem;
}

.calendar-frame {
  width: 100%;
  min-height: 600px;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.site-footer {
  background: var(--primary-dark);
  color: #edf4ff;
  padding: 1.5rem 0;
  margin-top: 2rem;
}

.site-footer p {
  margin: 0;
  color: #edf4ff;
  text-align: center;
}

.site-footer a {
  color: #ffffff;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.15em;
}

.site-footer a:hover,
.site-footer a:focus {
  color: #dfeaff;
  text-decoration-thickness: 3px;
}

.notice {
  border-left: 4px solid var(--primary);
  background: var(--surface-alt);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  margin: 1.5rem 0;
}

@media (max-width: 760px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav {
    justify-content: flex-start;
  }

  .brand {
    font-size: 0.8rem;
  }

  .calendar-frame {
    min-height: 460px;
  }
}