@charset "UTF-8";

:root {
  --activities-bg: #eef3f8;
  --activities-surface: #ffffff;
  --activities-border: #d6dee8;
  --activities-text: #28405f;
  --activities-heading: #143f69;
  --activities-accent: #c63b2d;
  --activities-shadow: 0 8px 24px rgba(20, 63, 105, 0.06);
  --activities-radius: 14px;
}

html {
  scroll-behavior: smooth;
}

.activities-page {
  background: var(--activities-bg);
  color: var(--activities-text);
}

.activities-page .container {
  width: min(1100px, calc(100% - 40px));
  margin-inline: auto;
}

/* =========================
   パンくず
========================= */

.activities-breadcrumb {
  padding: 18px 0 0;
}

.activities-breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: #5f7894;
  font-size: 0.95rem;
}

.activities-breadcrumb-list a {
  color: #315f97;
  text-decoration: none;
}

.activities-breadcrumb-list a:hover {
  text-decoration: underline;
}

/* =========================
   ページ見出し
========================= */

.activities-hero {
  padding: 24px 0 32px;
  background: linear-gradient(180deg, #edf3f8 0%, #e8eff6 100%);
  border-bottom: 1px solid #d9e2ec;
}

.activities-kicker {
  margin: 0 0 10px;
  color: var(--activities-accent);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.activities-title {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--activities-heading);
}

.activities-lead {
  max-width: 920px;
  margin: 18px 0 0;
  font-size: 1.02rem;
  line-height: 2;
  color: #47617f;
}

/* =========================
   ローカルナビ
========================= */

.activities-local-nav {
  margin-top: 28px;
}

.activities-local-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.activities-local-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--activities-border);
  border-radius: 999px;
  background: #ffffff;
  color: var(--activities-heading);
  font-weight: 700;
  text-decoration: none;
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}

.activities-local-nav a:hover,
.activities-local-nav a:focus {
  background: var(--activities-heading);
  border-color: var(--activities-heading);
  color: #ffffff;
  transform: translateY(-1px);
}

/* =========================
   セクション共通
========================= */

.activities-section {
  padding: 22px 0;
}

.activities-section:first-of-type {
  padding-top: 38px;
}

.activities-card {
  background: var(--activities-surface);
  border: 1px solid var(--activities-border);
  border-radius: var(--activities-radius);
  box-shadow: var(--activities-shadow);
  padding: 28px 28px 30px;
}

.activities-section-title {
  position: relative;
  margin: 0 0 22px;
  padding-left: 18px;
  font-size: clamp(1.45rem, 2vw, 2rem);
  line-height: 1.3;
  font-weight: 800;
  color: var(--activities-heading);
}

.activities-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 6px;
  height: 1.2em;
  border-radius: 999px;
  background: var(--activities-heading);
}

.activities-body p {
  margin: 0 0 1.2em;
  line-height: 2.05;
  font-size: 1rem;
}

.activities-body p:last-child {
  margin-bottom: 0;
}

/* =========================
   シンポジウムカード
========================= */

.activities-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.activities-grid-item {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 150px;
  background: #f8fafc;
  border: 1px solid #d9e2eb;
  border-radius: 14px;
  padding: 20px;
}

.activities-grid-item h3 {
  margin: 0 0 10px;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--activities-heading);
}

.activities-grid-item p {
  margin: 0;
  color: #526b84;
  line-height: 1.85;
  font-size: 0.98rem;
}

/* =========================
   各種活動の推進
========================= */

.activities-list-block {
  margin-top: 22px;
}

.activities-list-item {
  padding: 18px 0;
  border-top: 1px solid #e3e9f0;
}

.activities-list-item:first-child {
  border-top: none;
  padding-top: 0;
}

.activities-list-item h3 {
  margin: 0 0 10px;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--activities-heading);
}

.activities-list-item p {
  margin: 0;
  color: #526b84;
  line-height: 1.95;
  font-size: 0.99rem;
}

/* =========================
   講演記録
========================= */

.activities-record-list {
  margin: 16px 0 0;
  padding-left: 1.35em;
}

.activities-record-list li {
  margin-bottom: 10px;
  line-height: 1.9;
  font-size: 0.98rem;
}

.activities-record-list li:last-child {
  margin-bottom: 0;
}

/* =========================
   補助リンク類
========================= */

.activities-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.activities-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 10px;
  border: 1px solid var(--activities-border);
  background: #f7fafc;
  color: var(--activities-heading);
  font-weight: 700;
  text-decoration: none;
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}

.activities-links a:hover,
.activities-links a:focus {
  background: var(--activities-heading);
  border-color: var(--activities-heading);
  color: #ffffff;
  transform: translateY(-1px);
}

/* =========================
   上へ戻るボタン
========================= */

.back-to-top {
  position: fixed;
  right: 25px;
  bottom: 25px;
  width: 46px;
  height: 46px;
  background: #143f69;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 18px;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.back-to-top:hover {
  background: #c63b2d;
  transform: translateY(-3px);
}

/* =========================
   レスポンシブ
========================= */

@media (max-width: 900px) {
  .activities-grid {
    grid-template-columns: 1fr;
  }

  .activities-grid-item {
    min-height: 0;
  }
}

@media (max-width: 767px) {
  .activities-hero {
    padding: 22px 0 26px;
  }

  .activities-title {
    font-size: clamp(1.85rem, 7vw, 2.5rem);
  }

  .activities-card {
    padding: 22px 18px 24px;
  }

  .activities-lead,
  .activities-body p,
  .activities-grid-item p,
  .activities-list-item p,
  .activities-record-list li {
    line-height: 1.9;
  }

  .activities-local-nav ul {
    gap: 10px;
  }

  .activities-local-nav a {
    min-height: 44px;
    padding: 0 16px;
  }

  .back-to-top {
    right: 18px;
    bottom: 18px;
    width: 42px;
    height: 42px;
    font-size: 16px;
  }
}