@charset "UTF-8";
/* ==========================================================
   プラスチック加工研究会（plaken.jp）共通スタイル
   ========================================================== */
:root {
  --navy: #1b3a63;
  --navy-dark: #12233c;
  --ink: #222;
  --gray: #666;
  --line: #e3e6ea;
  --bg-soft: #f5f7fa;
  --accent: #2e6da4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  color: var(--ink);
  line-height: 1.9;
  font-size: 16px;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { opacity: .8; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- ヘッダー ---------- */
.site-header { background: #fff; }
.site-header .logo-wrap {
  text-align: center;
  padding: 28px 20px 20px;
}
.site-header .logo-wrap img {
  display: inline-block;
  width: min(560px, 86%);
}

.global-nav {
  background: var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
}
.global-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
.global-nav li a {
  display: block;
  color: #fff;
  font-size: 14px;
  padding: 16px 22px;
  letter-spacing: .05em;
  border-left: 1px solid rgba(255,255,255,.18);
}
.global-nav li:last-child a { border-right: 1px solid rgba(255,255,255,.18); }
.global-nav li a:hover,
.global-nav li a.current { background: rgba(255,255,255,.12); opacity: 1; }

.nav-toggle { display: none; }

/* ---------- ヒーロー（トップ） ---------- */
.hero {
  position: relative;
  height: min(62vh, 560px);
  overflow: hidden;
  background: var(--navy-dark);
}
.hero .slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.6s ease;
}
.hero .slide.active { opacity: 1; }

.tagline {
  background: var(--navy-dark);
  color: #fff;
  text-align: center;
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: .12em;
  padding: 34px 20px;
}

/* ---------- 下層ページ見出し ---------- */
.page-hero {
  background: linear-gradient(rgba(18,35,60,.55), rgba(18,35,60,.55)), var(--navy-dark) center/cover;
  background-image: linear-gradient(rgba(18,35,60,.6), rgba(18,35,60,.6)), url(../img/hero6.jpg);
  color: #fff;
  text-align: center;
  padding: 72px 20px;
}
.page-hero h1 {
  font-size: clamp(24px, 3.4vw, 34px);
  letter-spacing: .14em;
  font-weight: 700;
}
.page-hero .en {
  display: block;
  font-size: 13px;
  letter-spacing: .3em;
  margin-top: 8px;
  opacity: .75;
}

/* ---------- セクション ---------- */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-soft); }

.section-title {
  text-align: center;
  font-size: clamp(22px, 3vw, 28px);
  letter-spacing: .12em;
  margin-bottom: 8px;
  color: var(--navy);
}
.section-lead {
  text-align: center;
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 40px;
}
.section-title + .section-body,
.section-lead + .section-body { margin-top: 24px; }

h3.block-title {
  font-size: 20px;
  color: var(--navy);
  border-left: 5px solid var(--navy);
  padding-left: 14px;
  margin: 40px 0 18px;
  letter-spacing: .06em;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin: 40px 0;
}
.two-col.reverse > .col-img { order: 2; }

/* ---------- カード ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 32px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.card .card-body { padding: 20px 22px 24px; }
.card h4 { color: var(--navy); font-size: 18px; margin-bottom: 6px; }
.card .sub { font-size: 13px; color: var(--gray); }

/* ---------- お知らせ ---------- */
.news-list { max-width: 860px; margin: 0 auto; }
.news-item {
  border-bottom: 1px solid var(--line);
  padding: 28px 4px;
}
.news-item .meta { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.news-item .date { font-weight: 700; color: var(--navy); letter-spacing: .04em; }
.news-item .cat {
  font-size: 12px;
  background: var(--navy);
  color: #fff;
  border-radius: 3px;
  padding: 2px 10px;
  letter-spacing: .08em;
}
.news-item h3 { font-size: 19px; margin-bottom: 8px; color: var(--ink); }
.news-item .body p { margin-bottom: 1em; }
.news-item .body p:last-child { margin-bottom: 0; }
.news-item .news-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.news-item .news-images img { border-radius: 6px; }

/* トップページの活動記録（抜粋） */
.news-digest .news-item { display: flex; gap: 24px; align-items: flex-start; }
.news-digest .news-item > div { flex: 1; min-width: 0; }
.news-digest .thumb {
  flex: 0 0 auto;
  width: 200px;
  height: 150px;
  object-fit: cover;
  border-radius: 6px;
}
.news-digest .body { color: var(--gray); font-size: 14px; }
.more-btn-wrap { text-align: center; margin-top: 36px; }
.more-btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  padding: 13px 48px;
  border-radius: 4px;
  letter-spacing: .1em;
  font-size: 15px;
}

/* ---------- 表 ---------- */
.simple-table { width: 100%; border-collapse: collapse; margin-top: 24px; }
.simple-table th, .simple-table td {
  border: 1px solid var(--line);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}
.simple-table th { background: var(--bg-soft); color: var(--navy); white-space: nowrap; }

/* 沿革 */
.history-list { max-width: 760px; margin: 0 auto; }
.history-list dt {
  color: var(--navy);
  font-weight: 700;
  font-size: 18px;
  margin-top: 28px;
  border-bottom: 2px solid var(--navy);
  padding-bottom: 4px;
}
.history-list dd { padding: 10px 4px 0; }
.history-list dd ul { list-style: none; }
.history-list dd li { padding-left: 1.2em; text-indent: -1.2em; margin-bottom: 4px; }
.history-list dd li::before { content: "・"; }

/* ---------- 役員 ---------- */
.person {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}
.person img { border-radius: 8px; width: 100%; }
.person .role { color: var(--navy); font-weight: 700; font-size: 14px; letter-spacing: .08em; }
.person h4 { font-size: 22px; margin: 2px 0 12px; }
.person p { margin-bottom: .8em; font-size: 15px; }
.person .label { font-weight: 700; color: var(--navy); }

/* ---------- 会員企業 ---------- */
.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 26px;
  margin-top: 32px;
}
.member-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.member-card .logo-box {
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.member-card .logo-box img { max-height: 84px; width: auto; max-width: 100%; }
.member-card h4 { font-size: 17px; color: var(--navy); }
.member-card p { font-size: 14px; color: var(--gray); }
.member-card a { font-size: 13px; word-break: break-all; }

/* ---------- お問い合わせ ---------- */
.contact-box {
  max-width: 680px;
  margin: 0 auto;
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 48px 40px;
  text-align: center;
}
.contact-box .mail-btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  font-size: 17px;
  padding: 16px 52px;
  border-radius: 6px;
  margin: 22px 0 10px;
  letter-spacing: .06em;
}
.contact-box .note { font-size: 13px; color: var(--gray); }

/* お問い合わせフォーム */
.contact-box-form { text-align: left; }
.contact-form label {
  display: block;
  font-weight: 700;
  font-size: 14px;
  color: var(--navy);
  margin: 16px 0 6px;
}
.contact-form .req { color: #c0392b; font-size: 12px; margin-left: 4px; }
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ccd3db;
  border-radius: 6px;
  font-size: 16px;
  font-family: inherit;
  background: #fff;
}
.contact-form textarea { min-height: 180px; resize: vertical; }
.contact-form .mail-btn { border: 0; cursor: pointer; font-family: inherit; }

/* ---------- フッター ---------- */
.site-footer {
  background: var(--navy-dark);
  color: #fff;
  margin-top: 80px;
  padding: 48px 20px 28px;
  text-align: center;
}
.site-footer .f-nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 26px;
  margin-bottom: 26px;
}
.site-footer .f-nav a { color: rgba(255,255,255,.85); font-size: 13px; }
.site-footer .address { font-size: 13px; color: rgba(255,255,255,.7); margin-bottom: 18px; }
.site-footer .copyright { font-size: 12px; color: rgba(255,255,255,.5); }
.site-footer .policy { font-size: 12px; }
.site-footer .policy a { color: rgba(255,255,255,.7); }

/* ---------- スマホ対応 ---------- */
@media (max-width: 820px) {
  .nav-toggle {
    display: block;
    width: 100%;
    background: var(--navy);
    color: #fff;
    border: 0;
    font-size: 15px;
    letter-spacing: .1em;
    padding: 14px;
    cursor: pointer;
  }
  .global-nav ul { display: none; flex-direction: column; }
  .global-nav ul.open { display: flex; }
  .global-nav li a { border: 0; border-top: 1px solid rgba(255,255,255,.15); text-align: center; }

  .two-col { grid-template-columns: 1fr; gap: 20px; }
  .two-col.reverse > .col-img { order: 0; }
  .person { grid-template-columns: 1fr; gap: 16px; }
  .person img { max-width: 240px; }
  .news-digest .news-item { flex-direction: column; }
  .news-digest .thumb { flex: none; width: 100%; }
  .section { padding: 44px 0; }
}