/* =========================================================
   福岡歯科大学福岡県西同窓会 — サイト共通スタイル
   デザインコンセプト：博多織の縞（献上柄）と山笠の色を
   下敷きにした、落ち着きのある同窓会サイト
   ========================================================= */

:root {
  --color-bg: #F5F1E6;          /* 生成り（きなり） */
  --color-surface: #FFFFFF;
  --color-indigo: #1B2A4A;      /* 紺 */
  --color-indigo-soft: #2C4066;
  --color-vermillion: #B6431E;  /* 朱色（山笠） */
  --color-gold: #A9812E;        /* 金茶（献上柄） */
  --color-text: #262420;
  --color-text-soft: #57534A;
  --color-border: #DFD7C4;

  --font-display: "Noto Serif JP", serif;
  --font-body: "Noto Sans JP", sans-serif;

  --max-width: 880px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-indigo-soft);
  text-decoration: none;
}
a:hover, a:focus-visible {
  text-decoration: underline;
}
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-vermillion);
  outline-offset: 2px;
}

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

/* ---------- 献上柄ふうストライプバー（サイトの署名要素） ---------- */
.kenjo-bar {
  height: 7px;
  width: 100%;
  background: repeating-linear-gradient(
    90deg,
    var(--color-indigo) 0px, var(--color-indigo) 22px,
    var(--color-gold) 22px, var(--color-gold) 28px,
    var(--color-vermillion) 28px, var(--color-vermillion) 34px,
    var(--color-gold) 34px, var(--color-gold) 40px,
    var(--color-indigo) 40px, var(--color-indigo) 74px,
    var(--color-vermillion) 74px, var(--color-vermillion) 78px
  );
}

/* ---------- ヘッダー（大型ヒーロー） ---------- */
.site-header {
  position: relative;
  min-height: min(58vh, 460px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-indigo);
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(180deg, rgba(15,23,42,0.45) 0%, rgba(15,23,42,0.35) 45%, rgba(15,23,42,0.72) 100%),
    url('/images/header-bg.jpg');
  background-size: cover;
  background-position: center 30%;
  z-index: 0;
}

.site-header__inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 64px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 22px;
}

.site-header__mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.5);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 18px;
}

.site-header__inner h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(22px, 4.6vw, 42px);
  margin: 0;
  letter-spacing: 0.22em;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0,0,0,0.5);
  white-space: nowrap;
}

.site-header__inner p {
  margin: 0;
  font-size: clamp(12px, 1.6vw, 14.5px);
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.85);
  text-shadow: 0 1px 8px rgba(0,0,0,0.4);
}

/* ---------- ナビゲーション ---------- */
.site-nav {
  background: var(--color-indigo);
}

.site-nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}

.site-nav a {
  color: #EDE8DA;
  font-size: 14.5px;
  padding: 13px 18px;
  display: inline-block;
  border-right: 1px solid rgba(255,255,255,0.12);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  background: var(--color-indigo-soft);
  text-decoration: none;
  color: #fff;
}

/* ---------- メイン ---------- */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 44px 24px 80px;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 30px);
  color: var(--color-indigo);
  margin: 0 0 8px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}
.page-title::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 0;
  width: 64px; height: 2px;
  background: var(--color-vermillion);
}

.lede {
  color: var(--color-text-soft);
  font-size: 15px;
  margin: 18px 0 40px;
}

/* ---------- 汎用カード / セクション ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 28px 26px;
  margin-bottom: 28px;
}

.greeting {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 22px;
  align-items: start;
}
.greeting img {
  width: 116px;
  height: 130px;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid var(--color-border);
}
.greeting h2 {
  font-family: var(--font-display);
  color: var(--color-indigo);
  font-size: 18px;
  margin: 0 0 4px;
}
.greeting .role {
  font-size: 13px;
  color: var(--color-vermillion);
  margin: 0 0 14px;
  letter-spacing: 0.04em;
}
.greeting p { margin: 0 0 1em; font-size: 15px; }

@media (max-width: 520px) {
  .greeting { grid-template-columns: 1fr; }
  .greeting img { width: 90px; height: 100px; }
}

/* ---------- 会務報告 / 会則：年度セクション ---------- */
.year-block {
  margin-bottom: 44px;
}
.year-block__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 18px;
  color: #fff;
  background: var(--color-indigo);
  padding: 6px 18px;
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}

.event-group h3 {
  font-size: 13.5px;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  text-transform: none;
  margin: 26px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--color-border);
}

.event {
  display: grid;
  grid-template-columns: 2.4em 1fr;
  gap: 4px 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14.5px;
}
.event:last-child { border-bottom: none; }
.event__no {
  color: var(--color-vermillion);
  font-family: var(--font-display);
}
.event__title { font-weight: 600; grid-column: 2; }
.event__meta {
  grid-column: 2;
  color: var(--color-text-soft);
  font-size: 13.5px;
}

/* ---------- 会則 ---------- */
.bylaws-chapter {
  margin-bottom: 34px;
}
.bylaws-chapter h2 {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--color-indigo);
  border-left: 4px solid var(--color-vermillion);
  padding-left: 12px;
  margin: 0 0 14px;
}
.bylaws-chapter .article {
  margin: 0 0 16px;
  font-size: 14.5px;
}
.bylaws-chapter .article__no {
  font-weight: 700;
  color: var(--color-gold);
  display: block;
  margin-bottom: 2px;
}
.bylaws-chapter p, .bylaws-chapter li {
  margin: 0 0 6px;
  font-size: 14.5px;
}
.bylaws-doc-title {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-vermillion);
  margin: 56px 0 22px;
  padding-top: 24px;
  border-top: 2px solid var(--color-border);
}
.bylaws-doc-title:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.supplementary {
  font-size: 13.5px;
  color: var(--color-text-soft);
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
}

/* ---------- 役員名簿 ---------- */
.roster-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.roster-table th, .roster-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}
.roster-table th {
  color: var(--color-indigo);
  font-weight: 700;
  width: 34%;
}
.roster-note {
  font-size: 12.5px;
  color: var(--color-text-soft);
}

/* ---------- 共有アルバム CTA ---------- */
.album-cta {
  border-color: var(--color-gold);
  background: #FFFDF8;
}
.album-cta h2 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--color-indigo);
  margin: 0 0 8px;
}
.album-cta p {
  margin: 0 0 16px;
  font-size: 14.5px;
  color: var(--color-text-soft);
}
.album-cta__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}
.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.btn:hover, .btn:focus-visible { text-decoration: none; }
.btn--primary {
  background: var(--color-vermillion);
  color: #fff;
}
.btn--primary:hover, .btn--primary:focus-visible { background: #9C3818; color: #fff; }
.btn--outline {
  background: transparent;
  color: var(--color-indigo);
  border: 1.5px solid var(--color-indigo);
}
.btn--outline:hover, .btn--outline:focus-visible { background: var(--color-indigo); color: #fff; }
.album-cta__note {
  font-size: 12.5px;
  color: var(--color-text-soft);
  margin: 0;
}

/* ---------- 写真ギャラリー ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
}
.gallery-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}
.gallery-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.gallery-item__caption {
  padding: 10px 12px 14px;
}
.gallery-item__caption p {
  margin: 0;
  font-size: 13.5px;
}
.gallery-item__caption time {
  display: block;
  font-size: 12px;
  color: var(--color-text-soft);
  margin-top: 3px;
}

/* ---------- フッター ---------- */
.site-footer {
  background: var(--color-indigo);
  color: #C9C2AC;
  text-align: center;
  padding: 26px 24px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 640px) {
  .site-header__inner { padding: 22px 18px 14px; }
  .site-nav a { padding: 12px 13px; font-size: 13.5px; }
  main { padding: 32px 18px 60px; }
}

@media (max-width: 420px) {
  .site-header__inner h1 {
    font-size: 17px;
    letter-spacing: 0.12em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}