@charset "UTF-8";
/* ============================================
   帝塚山学院泉ヶ丘同窓会 リニューアルサイト
   base: 濃紺(スクールカラー) × 白 × 金の細線
   tone: 品格・余白・明朝
   ============================================ */

:root{
  --navy-950:#0a1a3a;
  --navy-900:#0e2247;
  --navy-800:#143062;
  --navy-700:#1e4283;
  --navy-600:#3057a3;
  --navy-100:#e8eefa;
  --gold:#a8894e;
  --gold-light:#c8ab74;
  --ink:#2a3654;
  --ink-light:#6d7994;
  --bg:#fafbfe;
  --paper:#edf2fa;
  --white:#ffffff;
  --line:rgba(14,34,71,.14);
  --radius:2px;
  --shadow:0 24px 60px rgba(10,26,58,.12);
  --font-serif:"Zen Old Mincho","Hiragino Mincho ProN",serif;
  --font-sans:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN",sans-serif;
  --font-en:"Cormorant Garamond","Times New Roman",serif;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--bg);
  line-height:2;
  font-size:17px;
  letter-spacing:.03em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;vertical-align:bottom}
a{color:var(--navy-700);text-decoration:none;transition:.3s}
ul,ol{list-style:none}
table{border-collapse:collapse;width:100%}
::selection{background:var(--navy-800);color:#fff}

.inner{max-width:1140px;margin:0 auto;padding:0 28px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,251,254,.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-header .inner{
  max-width:1280px;
  display:flex;align-items:center;justify-content:space-between;
  height:82px;
}
.brand{display:flex;flex-direction:column;gap:2px;line-height:1.35}
.brand .en{
  font-family:var(--font-en);font-size:11px;letter-spacing:.28em;
  color:var(--gold);text-transform:uppercase;
}
.brand .ja{font-family:var(--font-serif);font-size:22px;font-weight:700;letter-spacing:.06em;color:var(--navy-800)}
.gnav ul{display:flex;gap:4px;align-items:center}
.gnav a{
  display:block;padding:8px 15px;font-size:13px;font-weight:500;letter-spacing:.08em;
  color:var(--navy-800);
  border-bottom:1px solid transparent;
}
.gnav a:hover,.gnav a.current{border-bottom-color:var(--gold)}
.gnav li.mobile-only{display:none}
.gnav .nav-contact a{
  position:relative;
  background:var(--navy-800);color:#fff;padding:11px 22px;margin-left:10px;
  border:1px solid var(--navy-800);border-radius:var(--radius);
  transition:color .4s,border-color .4s;
  -webkit-perspective:300px;perspective:300px;
  -webkit-transform-style:preserve-3d;transform-style:preserve-3d;
}
.gnav .nav-contact a::before{
  content:"";position:absolute;inset:-1px;z-index:-1;
  border-radius:var(--radius);background:var(--navy-600);
  -webkit-transform-origin:center top;transform-origin:center top;
  -webkit-transform:rotateX(90deg);transform:rotateX(90deg);
  opacity:0;
  transition:transform .4s,opacity .4s;
}
.gnav .nav-contact a:hover::before{
  -webkit-transform:rotateX(0deg);transform:rotateX(0deg);
  opacity:1;
}
.gnav .nav-contact a:hover{border-color:var(--navy-600)}
.header-sns{display:flex;gap:10px;margin-left:16px}
.header-sns a{
  display:grid;place-items:center;width:42px;height:42px;border-radius:50%;
  color:#fff;border:0;
  box-shadow:0 5px 13px rgba(12,39,78,.16);
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease;
}
.header-sns a[aria-label="Instagram"]{
  background:linear-gradient(135deg,#833ab4 0%,#c13584 40%,#e1306c 68%,#f77737 100%);
}
.header-sns a[aria-label="Facebook"]{background:#1877f2}
.header-sns a:hover{
  color:#fff;transform:translateY(-2px) scale(1.04);
  box-shadow:0 8px 18px rgba(12,39,78,.24);filter:brightness(1.06);
}
.header-sns a:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.header-sns svg{width:19px;height:19px;fill:currentColor}

/* hamburger */
.nav-toggle{display:none}

/* ---------- buttons ----------
   hover: 「窓が上から閉まる」フリップ(疑似要素パネルがrotateXで降りてくる) */
.btn{
  position:relative;
  display:inline-flex;align-items:center;justify-content:center;gap:12px;
  padding:15px 36px;border-radius:var(--radius);
  font-weight:500;font-size:14px;letter-spacing:.14em;
  transition:color .4s,border-color .4s;
  border:1px solid transparent;cursor:pointer;line-height:1.6;
  -webkit-perspective:400px;perspective:400px;
  -webkit-transform-style:preserve-3d;transform-style:preserve-3d;
}
.btn::before{
  content:"";position:absolute;inset:-1px;z-index:-1;
  border-radius:var(--radius);
  -webkit-transform-origin:center top;transform-origin:center top;
  -webkit-transform:rotateX(90deg);transform:rotateX(90deg);
  opacity:0;
  transition:transform .4s,opacity .4s;
}
.btn:hover::before{
  -webkit-transform:rotateX(0deg);transform:rotateX(0deg);
  opacity:1;
}
.btn svg{width:15px;height:15px;fill:currentColor;flex-shrink:0;transition:fill .4s}
.btn-navy{background:var(--navy-800);color:#fff;border-color:var(--navy-800)}
.btn-navy::before{background:var(--navy-600)}
.btn-navy:hover{border-color:var(--navy-600)}
.btn-gold{background:transparent;color:var(--navy-800);border-color:rgba(20,48,98,.45)}
.btn-gold::before{background:var(--navy-800)}
.btn-gold:hover{color:#fff;border-color:var(--navy-800)}
.btn-ghost{border:1px solid rgba(255,255,255,.55);color:#fff;background:transparent}
.btn-ghost::before{background:#fff}
.btn-ghost:hover{color:var(--navy-900);border-color:#fff}

.link-arrow{
  display:inline-flex;align-items:center;gap:16px;
  color:var(--navy-800);font-size:14px;letter-spacing:.12em;font-weight:500;
}
.link-arrow .line{
  position:relative;width:52px;height:1px;flex-shrink:0;
  background:var(--gold);transition:.35s;
}
.link-arrow .line::after{
  content:"";position:absolute;right:0;bottom:0;width:10px;height:1px;
  background:var(--gold);transform:rotate(-35deg);transform-origin:right bottom;
}
.link-arrow:hover .line{width:72px}
/* 旧マークアップ(丸矢印)互換 */
.link-arrow .circ{
  width:44px;height:44px;border-radius:50%;flex-shrink:0;
  border:1px solid var(--gold-light);
  display:grid;place-items:center;transition:.35s;
}
.link-arrow .circ svg{width:14px;height:14px;fill:currentColor}
.link-arrow:hover .circ{background:var(--navy-800);border-color:var(--navy-800);color:#fff;transform:translateX(4px)}

/* ---------- hero ---------- */
.hero{
  position:relative;
  display:flex;
  min-height:min(88vh,820px);
  background:var(--navy-900);
  overflow:hidden;
}
.hero-body{
  position:relative;z-index:2;
  width:34%;
  min-width:430px;
  display:flex;align-items:center;
  color:#fff;
  padding:96px 0;
}
.hero-body-in{
  width:100%;
  padding:0 40px 0 max(36px,3.4vw);
}
.hero-en{
  font-family:var(--font-en);
  font-size:11px;letter-spacing:.34em;text-transform:uppercase;
  color:var(--gold-light);line-height:2.1;
  margin-bottom:30px;position:relative;padding-top:26px;
  opacity:0;animation:fadeUp 1.2s .1s cubic-bezier(.22,.8,.36,1) forwards;
}
.hero-en::before{
  content:"";position:absolute;left:1px;top:0;width:44px;height:1px;
  background:var(--gold);
}
.hero-title{
  font-family:var(--font-serif);font-weight:600;
  font-size:clamp(34px,3.4vw,52px);
  letter-spacing:.12em;line-height:1.72;
  color:#fff;
}
.hero-title > span{display:block;opacity:0;animation:fadeUp 1.1s cubic-bezier(.22,.8,.36,1) forwards}
.hero-title > span:nth-child(1){animation-delay:.3s}
.hero-title > span:nth-child(2){animation-delay:.5s}
.hero-title .accent{display:inline;color:var(--gold-light)}
@keyframes fadeDown{from{opacity:0;transform:translateY(-28px)}to{opacity:1;transform:none}}
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}

.hero-lead{
  margin-top:30px;
  font-size:16px;line-height:2.25;letter-spacing:.06em;
  color:rgba(255,255,255,.78);
  opacity:0;animation:fadeUp 1.1s .75s cubic-bezier(.22,.8,.36,1) forwards;
}
.hero-btns{
  display:flex;flex-direction:column;align-items:flex-start;gap:22px;
  margin-top:40px;
  opacity:0;animation:fadeUp 1.1s .95s cubic-bezier(.22,.8,.36,1) forwards;
}
.hero-btns .link-arrow{color:#fff}
.hero-since{
  margin-top:52px;
  font-family:var(--font-en);font-size:12px;letter-spacing:.3em;
  color:rgba(200,171,116,.85);text-transform:uppercase;
  opacity:0;animation:fadeUp 1.1s 1.15s cubic-bezier(.22,.8,.36,1) forwards;
}

.hero-media{
  position:absolute;inset:0;
  overflow:hidden;
}
.hero-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,
    var(--navy-900) 0,
    rgba(14,34,71,.94) 16%,
    rgba(14,34,71,.66) 34%,
    rgba(14,34,71,.34) 58%,
    rgba(14,34,71,.22) 100%);
}
.hero-slideshow{position:absolute;inset:0}
.hero-slideshow img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transform:scale(1.08);
  transition:opacity 2s ease,transform 8s linear;
  filter:saturate(1.02) contrast(1.02) brightness(.96);
}
.hero-slideshow img.show{opacity:1;transform:scale(1)}

.scroll-hint{
  position:absolute;right:38px;bottom:0;z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:14px;
  color:rgba(255,255,255,.7);
  font-family:var(--font-en);font-size:10px;letter-spacing:.3em;
  text-transform:uppercase;
}
.scroll-hint .txt{writing-mode:vertical-rl}
.scroll-hint .bar{width:1px;height:80px;overflow:hidden}
.scroll-hint .bar::before{
  content:"";display:block;width:100%;height:40px;
  background:linear-gradient(to bottom,rgba(255,255,255,0),rgba(255,255,255,.85));
  animation:scrollLine 1.8s linear infinite;
}
@keyframes scrollLine{
  0%{transform:translateY(-40px)}
  80%,100%{transform:translateY(80px)}
}

/* ---------- section base ---------- */
.section{padding:120px 0}
.section.alt{background:var(--paper)}
.sec-head{margin-bottom:60px}
.sec-head .en{
  display:block;
  font-family:var(--font-en);font-size:13px;letter-spacing:.34em;
  color:var(--gold);text-transform:uppercase;margin-bottom:14px;
}
.sec-head h2{
  font-family:var(--font-serif);font-size:32px;font-weight:600;
  color:var(--navy-800);letter-spacing:.1em;line-height:1.6;
}
.sec-head::after{
  content:"";display:block;width:52px;height:1px;
  background:var(--gold);margin-top:26px;
}
.sec-head.center{text-align:center}
.sec-head.center::after{margin-left:auto;margin-right:auto}
.sec-lead{margin-top:16px;color:var(--ink-light);font-size:16px;letter-spacing:.05em}

/* reveal animation */
.reveal{opacity:0;transform:translateY(28px);transition:opacity 1s ease,transform 1s ease}
.reveal.on{opacity:1;transform:none}

/* ---------- 青雲最新号 ---------- */
.seiun-latest{display:grid;grid-template-columns:300px 1fr;gap:72px;align-items:start}
.seiun-cover{position:relative}
.seiun-cover img{
  width:100%;border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.seiun-cover a{display:block;transition:.4s}
.seiun-cover a:hover{transform:translateY(-4px)}
.seiun-cover .badge{
  position:absolute;top:-14px;left:-14px;z-index:2;
  display:grid;place-items:center;width:64px;height:64px;
  background:var(--navy-900);color:#fff;
  font-family:var(--font-serif);font-weight:600;font-size:12px;
  letter-spacing:.08em;line-height:1.5;text-align:center;
  box-shadow:inset 0 0 0 1px rgba(200,171,116,.55),0 0 0 3px var(--navy-900);
}
.seiun-info h3{
  font-family:var(--font-serif);font-size:26px;font-weight:600;
  letter-spacing:.08em;color:var(--navy-800);margin-bottom:4px;
}
.seiun-info .note{
  font-size:12px;letter-spacing:.1em;color:var(--ink-light);margin-bottom:26px;
}
.toc{
  display:grid;grid-template-columns:1fr 1fr;gap:0 44px;
  font-size:15.5px;margin-bottom:36px;
}
.toc li{
  display:flex;align-items:baseline;gap:12px;
  padding:9px 2px;border-bottom:1px solid var(--line);
  letter-spacing:.04em;
}
.toc li::before{
  content:"";flex-shrink:0;width:12px;height:1px;
  background:var(--gold);transform:translateY(-4px);
}
.seiun-actions{display:flex;gap:16px;flex-wrap:wrap}

/* ---------- 会長挨拶 ---------- */
.aisatsu-wrap{
  display:grid;grid-template-columns:300px 1fr;gap:72px;align-items:start;
}
.aisatsu-profile{
  text-align:center;position:static;
  padding:0;
}
.aisatsu-profile .photo{
  position:relative;
  width:215px;height:215px;border-radius:50%;overflow:hidden;
  margin:0 auto 28px;
  outline:1px solid var(--gold-light);outline-offset:8px;
}
.aisatsu-profile .photo img{width:100%;height:100%;object-fit:cover;object-position:top}
.aisatsu-profile .photo::after{
  content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;
  background:linear-gradient(135deg,
    rgba(255,255,255,.1) 0%,
    rgba(255,255,255,.03) 22%,
    transparent 45%);
}
.aisatsu-profile .role{
  display:block;font-size:11px;letter-spacing:.2em;color:var(--gold);
}
.aisatsu-profile .name{
  font-family:var(--font-serif);font-size:26px;font-weight:600;
  letter-spacing:.14em;color:var(--navy-800);margin:8px 0 4px;
}
.aisatsu-profile .grade{font-size:12px;letter-spacing:.08em;color:var(--ink-light)}
.aisatsu-body .catch{
  position:relative;
  font-family:var(--font-serif);font-size:25px;font-weight:600;
  letter-spacing:.1em;color:var(--navy-800);
  margin-bottom:34px;padding-top:24px;line-height:1.8;
}
.aisatsu-body .catch::before{
  content:"";position:absolute;left:1px;top:0;width:40px;height:1px;background:var(--gold);
}
.aisatsu-body p{margin-bottom:1.4em;font-size:16.5px;line-height:2.15;letter-spacing:.05em}
.aisatsu-body .sign{text-align:right;font-size:14.5px;color:var(--ink-light);margin-top:34px}

/* ---------- 母校の記憶 ---------- */
.campus-memories{
  position:relative;overflow:hidden;isolation:isolate;
  background:var(--navy-950);color:#fff;
}
.campus-memories::before{
  content:"";position:absolute;z-index:0;inset:0 0 38%;
  background:url("../img/top/slider3.jpg") center 42%/cover no-repeat;
  filter:grayscale(1) saturate(.65) contrast(1.12);
  opacity:.42;transform:scale(1.06) translate3d(-.7%,0,0);
  transform-origin:center;pointer-events:none;
  animation:campusBackdrop 24s ease-in-out infinite alternate;
}
.campus-memories::after{
  content:"";position:absolute;z-index:0;inset:0;pointer-events:none;
  background:
    linear-gradient(90deg,var(--navy-950) 0%,rgba(10,26,58,.86) 45%,rgba(10,26,58,.52) 100%),
    linear-gradient(180deg,rgba(10,26,58,.12) 0%,rgba(10,26,58,.76) 32%,var(--navy-950) 57%);
}
@keyframes campusBackdrop{
  from{transform:scale(1.06) translate3d(-.7%,0,0)}
  to{transform:scale(1.12) translate3d(.7%,-1%,0)}
}
.campus-memories .inner{position:relative;z-index:1}
.campus-head{
  display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:end;
  margin-bottom:56px;
}
.campus-head .en{
  display:block;margin-bottom:14px;
  color:var(--gold-light);font-family:var(--font-en);
  font-size:13px;letter-spacing:.34em;text-transform:uppercase;
}
.campus-head h2{
  color:#fff;font-family:var(--font-serif);font-size:32px;font-weight:600;
  letter-spacing:.1em;line-height:1.6;
}
.campus-head h2::after{
  content:"";display:block;width:52px;height:1px;
  margin-top:26px;background:var(--gold);
}
.campus-head p{
  max-width:500px;color:rgba(255,255,255,.7);
  font-size:16px;line-height:2.15;letter-spacing:.06em;
}
.campus-gallery{
  display:grid;grid-template-columns:2fr 1fr;
  gap:18px;
}
.campus-gallery-secondary{
  grid-column:1 / -1;
  display:grid;grid-template-columns:1fr 1fr;gap:18px;
}
.campus-photo{
  position:relative;overflow:hidden;
  background:var(--navy-900);
}
.campus-photo-main{aspect-ratio:4/3}
.campus-photo-detail{min-height:100%}
.campus-gallery-secondary .campus-photo{aspect-ratio:3/2}
.campus-photo img{
  display:block;width:100%;height:100%;object-fit:cover;
  transition:transform 1.4s cubic-bezier(.22,.8,.36,1),filter .7s;
}
.campus-photo:hover img{transform:scale(1.025);filter:brightness(1.04)}
.campus-photo::after{
  content:"";position:absolute;inset:45% 0 0;pointer-events:none;
  background:linear-gradient(transparent,rgba(3,12,31,.78));
}
.campus-photo figcaption{
  position:absolute;left:24px;right:24px;bottom:20px;z-index:1;
  display:flex;align-items:center;gap:14px;
  color:#fff;line-height:1.5;
}
.campus-photo figcaption span{
  color:var(--gold-light);font-family:var(--font-en);
  font-size:14px;letter-spacing:.16em;
}
.campus-photo figcaption strong{
  font-family:var(--font-serif);font-size:19px;font-weight:500;
  letter-spacing:.08em;text-shadow:0 2px 12px rgba(3,12,31,.45);
}

/* ---------- 役員構成 ---------- */
.yakuin-table{
  border-top:1px solid var(--navy-800);
  font-size:16.5px;background:transparent;
}
.yakuin-table th,.yakuin-table td{
  padding:18px 8px;border-bottom:1px solid var(--line);text-align:left;
  vertical-align:top;
}
.yakuin-table thead th{
  background:transparent;color:var(--ink-light);font-weight:500;
  font-size:11px;letter-spacing:.24em;padding:12px 8px;
}
.yakuin-table tbody th{
  width:10em;background:transparent;color:var(--navy-800);
  font-family:var(--font-serif);font-weight:600;letter-spacing:.12em;
}
.yakuin-table .names{display:flex;flex-wrap:wrap;gap:6px 30px}
.yakuin-table .names span{white-space:nowrap}
.yakuin-table .names small{color:var(--ink-light);margin-left:.45em;font-size:11.5px;letter-spacing:.04em}

.committee-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:40px;margin-top:64px;
}
.committee-card{
  background:transparent;border-top:1px solid var(--navy-800);
  padding:24px 2px 0;
}
.committee-card h4{
  font-family:var(--font-serif);font-size:17px;font-weight:600;
  letter-spacing:.1em;color:var(--navy-800);margin-bottom:14px;
}
.committee-card dl{font-size:15.5px}
.committee-card dl div{display:flex;gap:14px;padding:6px 0;border-bottom:1px solid var(--line)}
.committee-card dl div:last-child{border-bottom:none}
.committee-card dt{width:5em;color:var(--ink-light);flex-shrink:0;font-size:12px;padding-top:2px;letter-spacing:.08em}
.committee-card dd small{color:var(--ink-light);margin-left:.45em;font-size:11.5px}
.jimukyoku{
  margin-top:56px;border-top:1px solid var(--navy-800);
  padding:22px 2px 0;font-size:16px;
  display:flex;gap:8px 32px;flex-wrap:wrap;align-items:center;
}
.jimukyoku .label{
  font-family:var(--font-serif);font-weight:600;letter-spacing:.12em;color:var(--navy-800);
  margin-right:12px;
}
.jimukyoku small{color:var(--ink-light);margin-left:.45em;font-size:11.5px}

/* ---------- リンクカード(バックナンバー/歩み/会則) ---------- */
.link-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:36px}
.link-card{
  position:relative;display:block;background:transparent;
}
.link-card .thumb{
  display:block;position:relative;aspect-ratio:16/10;overflow:hidden;
  border-radius:var(--radius);background:var(--navy-100);
}
.link-card .thumb img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 1.2s cubic-bezier(.22,.8,.36,1),filter .6s;
}
.link-card:hover .thumb img{transform:scale(1.06)}
.link-card .thumb::after{
  content:"";position:absolute;inset:0;
  background:rgba(14,34,71,.12);transition:.5s;
}
.link-card:hover .thumb::after{background:rgba(14,34,71,0)}
.link-card .en{
  display:block;margin-top:22px;
  font-family:var(--font-en);font-size:11px;letter-spacing:.3em;
  color:var(--gold);text-transform:uppercase;
}
.link-card h3{
  font-family:var(--font-serif);font-size:20px;font-weight:600;
  letter-spacing:.08em;color:var(--navy-800);margin:8px 0 10px;
  transition:.3s;
}
.link-card:hover h3{color:var(--navy-600)}
.link-card p{font-size:15px;color:var(--ink-light);line-height:2;letter-spacing:.04em}
.link-card .arrow{
  display:inline-flex;margin-top:14px;
  position:relative;width:52px;height:9px;color:var(--gold);
}
.link-card .arrow svg{display:none}
.link-card .arrow::before{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;
  background:currentColor;transition:.35s;
}
.link-card .arrow::after{
  content:"";position:absolute;right:0;bottom:0;width:10px;height:1px;
  background:currentColor;transform:rotate(-35deg);transform-origin:right bottom;
}
.link-card:hover .arrow{width:70px}

/* ---------- お問い合わせフォーム ---------- */
.contact-section{
  background:var(--navy-950);
  color:#fff;
}
.contact-section .sec-head h2{color:#fff}
.contact-section .sec-head .en{color:var(--gold-light)}
.contact-section .sec-lead{color:rgba(255,255,255,.7)}
.form-card{
  background:#fff;border-radius:var(--radius);
  padding:64px 60px;color:var(--ink);
  max-width:780px;margin:0 auto;
}
.form-row{margin-bottom:26px}
.form-row label{
  display:flex;align-items:center;gap:10px;font-weight:500;font-size:15.5px;
  letter-spacing:.08em;color:var(--navy-800);margin-bottom:10px;
}
.req,.opt{
  font-size:10px;padding:2px 9px;border-radius:var(--radius);
  font-weight:500;letter-spacing:.14em;flex-shrink:0;
}
.req{border:1px solid #ab3f34;color:#ab3f34;background:transparent}
.opt{border:1px solid var(--line);color:var(--ink-light);background:transparent}
input[type="text"],input[type="email"],input[type="tel"],select,textarea{
  width:100%;padding:13px 16px;border:1px solid #ccd6e8;border-radius:var(--radius);
  font-family:inherit;font-size:16px;letter-spacing:.04em;background:#fafcff;transition:.25s;
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--navy-600);background:#fff;
}
input::placeholder,textarea::placeholder{color:#b3bac6}
textarea{min-height:150px;resize:vertical}
.form-note{font-size:14px;color:var(--ink-light);margin-top:6px}
.form-agree{
  display:flex;align-items:center;justify-content:center;gap:10px;
  font-size:16px;margin:34px 0 26px;
}
.form-agree input{width:17px;height:17px;accent-color:var(--navy-800)}
.form-submit{text-align:center}
.form-submit .btn{background:var(--navy-800);color:#fff;border-color:var(--navy-800);padding:17px 72px;font-size:15px}
.form-submit .btn::before{background:var(--navy-600)}
.form-submit .btn:hover{color:#fff;border-color:var(--navy-600)}
.confirm-btns .btn-gold{background:var(--navy-800);color:#fff;border-color:var(--navy-800)}
.confirm-btns .btn-gold::before{background:var(--navy-600)}
.confirm-btns .btn-gold:hover{color:#fff;border-color:var(--navy-600)}
.hp-field{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}

/* 個人情報保護方針 埋め込みフレーム */
.privacy-frame{
  max-width:780px;margin:48px auto 0;background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);
  padding:32px 12px 32px 34px;
}
.privacy-frame h3{
  font-family:var(--font-serif);font-size:17px;font-weight:600;
  letter-spacing:.14em;color:var(--gold-light);margin-bottom:16px;
}
.privacy-scroll{
  max-height:260px;overflow-y:auto;padding-right:22px;
  font-size:15px;line-height:2.05;color:rgba(255,255,255,.82);
}
.privacy-scroll h4{
  color:#fff;font-size:14px;letter-spacing:.08em;margin:20px 0 6px;padding-left:14px;
  border-left:2px solid var(--gold);
}
.privacy-scroll h4:first-child{margin-top:0}
.privacy-scroll::-webkit-scrollbar{width:5px}
.privacy-scroll::-webkit-scrollbar-track{background:rgba(255,255,255,.08)}
.privacy-scroll::-webkit-scrollbar-thumb{background:var(--gold)}

/* ---------- 下層ページ共通 ---------- */
.page-hero{
  background:var(--navy-900);
  color:#fff;padding:92px 0 84px;position:relative;overflow:hidden;isolation:isolate;
}
.page-hero-history::before,
.page-hero-seiun::after,
.page-hero-history::after{
  content:"";position:absolute;pointer-events:none;
}
.seiun-hero-stream{
  position:absolute;z-index:0;inset:-150px -100px -150px 40%;
  display:flex;justify-content:center;overflow:hidden;pointer-events:none;
  opacity:.72;filter:saturate(.72) contrast(1.04);
  transform:rotate(-15deg);transform-origin:center;
}
.seiun-hero-track{
  display:flex;flex:none;flex-direction:column;width:max-content;height:max-content;
  transform:translate3d(0,-33.333333%,0);
  animation:seiunHeroFlow 30s linear infinite;
  animation-play-state:running;animation-fill-mode:both;
  will-change:transform;
}
.seiun-hero-group{
  display:grid;flex:none;grid-template-columns:repeat(3,168px);
  gap:22px;padding-bottom:22px;
}
.seiun-hero-cover{
  display:block;flex:none;width:168px;aspect-ratio:205/290;height:auto;object-fit:cover;
  border:1px solid rgba(255,255,255,.3);
  box-shadow:0 16px 34px rgba(3,13,35,.38);
}
@keyframes seiunHeroFlow{
  from{transform:translate3d(0,-33.333333%,0)}
  to{transform:translate3d(0,0,0)}
}
.page-hero-seiun::after{
  z-index:1;inset:0;
  background:linear-gradient(90deg,
    var(--navy-900) 0%,var(--navy-900) 31%,
    rgba(14,34,71,.9) 47%,rgba(14,34,71,.42) 72%,rgba(14,34,71,.18) 100%);
}
.page-hero-history::before{
  z-index:0;inset:0;
  background:url("../img/top/slider1.jpg") center 44%/cover no-repeat;
  filter:grayscale(1) saturate(.6) contrast(1.08);
  opacity:.32;transform:scale(1.02);
}
.history-film-flow{
  position:absolute;z-index:1;inset:-150px -80px -150px 43%;
  display:flex;justify-content:center;overflow:hidden;pointer-events:none;
  transform:rotate(-15deg);transform-origin:center;
}
.history-film-track{
  flex:none;width:430px;height:max-content;
  transform:translate3d(0,-33.333333%,0);
  animation:historyFilmFlow 48s linear infinite;
  animation-fill-mode:both;will-change:transform;
  box-shadow:0 0 38px rgba(3,13,35,.38);
}
.history-film-group{
  position:relative;display:flex;flex-direction:column;gap:16px;
  width:430px;padding:22px 36px;box-sizing:border-box;
  background:rgba(5,16,39,.84);
}
.history-film-group::before,.history-film-group::after{
  content:"";position:absolute;top:0;bottom:0;width:11px;
  background:radial-gradient(ellipse at center,
    rgba(230,219,190,.62) 0 40%,transparent 44%) center top/9px 18px repeat-y;
  opacity:.58;
}
.history-film-group::before{left:11px}
.history-film-group::after{right:11px}
.history-film-frame{
  position:relative;flex:none;height:154px;margin:0;overflow:hidden;
  border:4px solid rgba(237,230,210,.72);background:var(--navy-950);
  box-shadow:0 8px 18px rgba(0,0,0,.28);
}
.history-film-frame img{
  display:block;width:100%;height:100%;object-fit:cover;
  filter:saturate(.72) contrast(1.06) brightness(.92);
}
.history-film-frame figcaption{
  position:absolute;right:10px;bottom:8px;padding:3px 6px;
  background:rgba(5,16,39,.68);color:rgba(255,255,255,.84);
  font-family:var(--font-serif);font-size:9px;letter-spacing:.14em;
}
@keyframes historyFilmFlow{
  from{transform:translate3d(0,-33.333333%,0)}
  to{transform:translate3d(0,0,0)}
}
.page-hero-history::after{
  z-index:2;inset:0;
  background:linear-gradient(90deg,
    var(--navy-900) 0%,rgba(14,34,71,.93) 40%,
    rgba(14,34,71,.58) 70%,rgba(14,34,71,.28) 100%);
}
.page-hero .en{
  display:block;
  font-family:var(--font-en);font-size:12px;letter-spacing:.34em;
  color:var(--gold-light);text-transform:uppercase;margin-bottom:14px;
}
.page-hero h1{
  font-family:var(--font-serif);font-size:34px;font-weight:600;letter-spacing:.12em;
}
.page-hero .inner{position:relative;z-index:1}
.page-hero-seiun .inner{z-index:2}
.page-hero-history .inner{z-index:3}
.page-hero .inner::after{
  content:"";display:block;width:52px;height:1px;
  background:var(--gold);margin-top:28px;
}
.breadcrumb{
  font-size:11.5px;letter-spacing:.06em;color:var(--ink-light);padding:20px 28px;
}
.breadcrumb a{color:var(--ink-light);text-decoration:underline;text-underline-offset:3px}
.breadcrumb a:hover{color:var(--navy-700)}

/* ---------- バックナンバー ---------- */
.issue-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:32px;
}
.issue-card{
  background:#fff;border-radius:var(--radius);border:1px solid var(--line);
  padding:30px;display:flex;flex-direction:column;gap:16px;
  transition:.4s;
}
.issue-card:hover{box-shadow:var(--shadow);border-color:transparent}
.issue-head{display:flex;gap:22px;align-items:flex-start}
.issue-head .cover{
  width:96px;flex-shrink:0;border-radius:var(--radius);overflow:hidden;
  box-shadow:6px 8px 20px rgba(10,26,58,.18);
}
.issue-head .meta .no{
  font-family:var(--font-serif);font-size:21px;letter-spacing:.06em;
  color:var(--navy-800);font-weight:600;line-height:1.4;
}
.issue-head .meta .size{font-size:11.5px;letter-spacing:.08em;color:var(--ink-light);display:block;margin:6px 0 14px}
.issue-card details{font-size:15px}
.issue-card summary{
  cursor:pointer;color:var(--navy-700);font-weight:500;font-size:15px;letter-spacing:.06em;
  list-style:none;display:flex;align-items:center;gap:8px;
}
.issue-card summary::-webkit-details-marker{display:none}
.issue-card summary::before{content:"＋";color:var(--gold);font-weight:500}
.issue-card details[open] summary::before{content:"−"}
.issue-card details ul{margin-top:10px;padding-left:2px}
.issue-card details li{
  position:relative;padding-left:16px;line-height:1.9;color:var(--ink-light);
}
.issue-card details li::before{
  content:"";position:absolute;left:0;top:.95em;width:8px;height:1px;
  background:var(--gold);
}
.btn-pdf{
  position:relative;
  display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  background:transparent;color:var(--navy-800);border:1px solid rgba(20,48,98,.45);
  font-size:12.5px;font-weight:500;letter-spacing:.12em;
  padding:9px 22px;border-radius:var(--radius);
  transition:color .4s,border-color .4s;
  -webkit-perspective:300px;perspective:300px;
  -webkit-transform-style:preserve-3d;transform-style:preserve-3d;
}
.btn-pdf::before{
  content:"";position:absolute;inset:-1px;z-index:-1;
  border-radius:var(--radius);background:var(--navy-800);
  -webkit-transform-origin:center top;transform-origin:center top;
  -webkit-transform:rotateX(90deg);transform:rotateX(90deg);
  opacity:0;
  transition:transform .4s,opacity .4s;
}
.btn-pdf:hover::before{
  -webkit-transform:rotateX(0deg);transform:rotateX(0deg);
  opacity:1;
}
.btn-pdf:hover{border-color:var(--navy-800);color:#fff}
.btn-pdf svg{width:13px;height:13px;fill:currentColor;transition:fill .4s}
.pdf-notice{
  margin-top:48px;font-size:14.5px;letter-spacing:.05em;color:var(--ink-light);text-align:center;
}

/* ---------- 同窓会の歩み ---------- */
.timeline{position:relative;max-width:860px;margin:0 auto}
.timeline::before{
  content:"";position:absolute;left:112px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(var(--navy-600),var(--gold));
}
.tl-item{
  position:relative;padding:0 0 48px 160px;
}
.tl-item::before{
  content:"";position:absolute;left:108px;top:12px;
  width:9px;height:9px;border-radius:50%;background:var(--bg);
  border:1px solid var(--navy-700);z-index:1;
}
.tl-item.milestone::before{background:var(--gold);border-color:var(--gold)}
.tl-year{
  position:absolute;left:0;top:2px;width:88px;text-align:right;
  font-family:var(--font-en);font-size:26px;font-weight:500;color:var(--navy-800);
  line-height:1.2;letter-spacing:.04em;
}
.tl-year small{
  display:block;font-size:10.5px;letter-spacing:.1em;color:var(--ink-light);
  font-family:var(--font-sans);font-weight:400;margin-top:2px;
}
.tl-body{
  background:#fff;border-radius:var(--radius);border:1px solid var(--line);
  padding:24px 30px;font-size:15.5px;
}
.tl-body ul li{
  position:relative;padding-left:18px;margin-bottom:6px;line-height:1.95;
}
.tl-body ul li:last-child{margin-bottom:0}
.tl-body ul li::before{
  content:"";position:absolute;left:0;top:.95em;width:9px;height:1px;
  background:var(--navy-600);
}
.tl-body .month{color:var(--gold);font-weight:500;font-size:14px;letter-spacing:.08em;margin-right:.7em}
.tl-badge{
  display:inline-block;border:1px solid var(--gold);color:var(--gold);
  background:transparent;font-size:11px;font-weight:500;letter-spacing:.18em;
  padding:3px 14px;border-radius:var(--radius);margin-bottom:12px;
}
.tl-principal{
  margin-top:14px;padding-top:12px;border-top:1px solid var(--line);
  font-size:14.5px;color:var(--ink-light);
}
.tl-principal strong{color:var(--navy-800)}

/* ---------- footer ---------- */
.site-footer{background:var(--navy-950);color:rgba(255,255,255,.8)}
.footer-main{
  display:grid;grid-template-columns:1.2fr 1fr;gap:56px;
  padding:80px 0 56px;
}
.footer-brand .ja{
  font-family:var(--font-serif);font-size:21px;letter-spacing:.08em;color:#fff;display:block;
}
.footer-brand .en{
  font-family:var(--font-en);font-size:10px;letter-spacing:.28em;
  color:var(--gold-light);text-transform:uppercase;display:block;line-height:1.5;
}
.footer-addr{font-size:15px;line-height:2.15;letter-spacing:.04em;margin-top:20px;font-style:normal}
.footer-addr a{color:var(--gold-light)}
.footer-sns{display:flex;gap:12px;margin-top:24px}
.footer-sns a{
  display:grid;place-items:center;width:40px;height:40px;border-radius:50%;
  border:1px solid rgba(255,255,255,.28);color:#fff;background:transparent;
}
.footer-sns a:hover{background:#fff;border-color:#fff;color:var(--navy-900)}
.footer-sns svg{width:17px;height:17px;fill:currentColor}
.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:8px 28px;align-content:start;padding-top:10px}
.footer-nav a{
  color:rgba(255,255,255,.8);font-size:12.5px;letter-spacing:.06em;
  display:inline-block;padding:4px 0;
}
.footer-nav a:hover{color:var(--gold-light)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:24px 0;font-size:10.5px;text-align:center;
  letter-spacing:.14em;color:rgba(255,255,255,.45);
}

/* ---------- 固定SNSバー(PC) ---------- */
.edge-sns{display:none}

/* ---------- 固定バー(スマホ) ---------- */
.mobile-bar{display:none}

/* ---------- to top ---------- */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:90;
  width:46px;height:46px;border-radius:50%;
  background:var(--navy-800);color:#fff;display:grid;place-items:center;
  opacity:0;pointer-events:none;transition:.35s;
  box-shadow:0 8px 22px rgba(10,26,58,.3);
}
.to-top:hover{background:var(--navy-600)}
.to-top.show{opacity:1;pointer-events:auto}
.to-top svg{width:15px;height:15px;fill:currentColor}

/* ============================================
   responsive
   ============================================ */
@media (max-width:1080px){
  .hero-body-in{padding:0 36px 0 28px}
  .hero-title{font-size:clamp(30px,3.6vw,40px)}
}

@media (max-width:960px){
  .section{padding:88px 0}
  .aisatsu-wrap{grid-template-columns:1fr;gap:48px}
  .aisatsu-profile{position:static}
  .campus-head{gap:44px}
  .seiun-latest{grid-template-columns:240px 1fr;gap:44px}
  .link-cards{grid-template-columns:1fr;max-width:560px;margin:0 auto;gap:44px}
  .footer-main{grid-template-columns:1fr;gap:40px}
}

@media (max-width:768px){
  html{scroll-padding-top:70px}
  body{font-size:16.5px}
  body.nav-open{overflow:hidden}
  .section{padding:72px 0}
  .site-header{
    background:#fafbfe;
    -webkit-backdrop-filter:none;backdrop-filter:none;
  }
  .site-header .inner{height:64px}
  .brand{gap:1px}
  .brand .ja{font-size:16.5px;white-space:nowrap}
  .brand .en{font-size:8.5px;letter-spacing:.2em;white-space:nowrap}
  .header-sns{display:none}

  /* drawer nav */
  .nav-toggle{
    display:block;position:relative;z-index:120;
    width:44px;height:44px;border:none;background:none;cursor:pointer;
  }
  .nav-toggle span{
    position:absolute;left:11px;width:22px;height:1.5px;background:var(--navy-800);
    transition:.3s;
  }
  .nav-toggle span:nth-child(1){top:16px}
  .nav-toggle span:nth-child(2){top:22px}
  .nav-toggle span:nth-child(3){top:28px}
  .nav-toggle.open span:nth-child(1){top:22px;transform:rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){top:22px;transform:rotate(-45deg)}
  .nav-toggle.open span{background:#fff}
  .gnav{
    position:fixed;inset:0;z-index:110;
    width:100%;min-height:100vh;height:100dvh;
    background:linear-gradient(155deg,#102c5d 0%,#0a1a3a 62%,#07142d 100%);
    display:flex;align-items:flex-start;justify-content:center;
    padding:76px 24px calc(82px + env(safe-area-inset-bottom));
    overflow-y:auto;overscroll-behavior:contain;
    opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .35s ease,visibility .35s ease;
  }
  .gnav.open{opacity:1;visibility:visible;pointer-events:auto}
  .gnav ul{
    width:min(100%,360px);margin:auto 0;
    flex-direction:column;align-items:stretch;gap:0;text-align:left;
    border-top:1px solid rgba(255,255,255,.16);
  }
  .gnav li{width:100%;border-bottom:1px solid rgba(255,255,255,.16)}
  .gnav li.mobile-only{display:block}
  .gnav a{
    position:relative;color:#fff;font-size:15px;letter-spacing:.12em;
    padding:13px 14px 13px 34px;border-bottom:none;
  }
  .gnav a::before{
    content:"";position:absolute;left:12px;top:50%;
    width:8px;height:1px;background:var(--gold);transform:translateY(-50%);
  }
  .gnav a:hover,.gnav a.current{border-bottom:none;color:var(--gold-light)}
  .gnav .nav-contact{border-bottom:0;padding:12px 0 4px}
  .gnav .nav-contact a{
    background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.55);
    margin-left:0;padding:12px 18px;text-align:center;
  }
  .gnav .nav-contact a::before{display:none}

  /* hero */
  .hero{flex-direction:column-reverse;min-height:auto}
  .hero-media{position:relative;left:auto;inset:auto;width:100%;aspect-ratio:4/3}
  .hero-media::after{
    background:linear-gradient(rgba(14,34,71,0) 60%,var(--navy-900) 100%);
  }
  .hero-body{
    width:100%;min-width:0;padding:40px 0 56px;
    background:var(--navy-900);
    -webkit-backdrop-filter:none;backdrop-filter:none;
    border-right:none;
  }
  .hero-body-in{max-width:none;margin:0;padding:0 28px}
  .hero-en{margin-bottom:22px;padding-top:22px}
  .hero-title{font-size:27px;line-height:1.9}
  .hero-lead{margin-top:22px;font-size:15px}
  .hero-btns{margin-top:30px}
  .hero-since{margin-top:36px}
  .scroll-hint{display:none}

  .sec-head h2{font-size:26px}
  .sec-head{margin-bottom:44px}

  .campus-head{grid-template-columns:1fr;gap:22px;margin-bottom:40px}
  .campus-memories::before{
    inset:0 0 70%;background-position:58% center;opacity:.38;
    animation-duration:28s;
  }
  .campus-memories::after{
    background:
      linear-gradient(90deg,rgba(10,26,58,.9),rgba(10,26,58,.58)),
      linear-gradient(180deg,rgba(10,26,58,.12) 0%,var(--navy-950) 31%);
  }
  .campus-head h2{font-size:26px}
  .campus-head h2::after{margin-top:20px}
  .campus-gallery{grid-template-columns:1fr}
  .campus-photo-main{grid-column:1;aspect-ratio:4/3}
  .campus-photo-detail{grid-column:1;aspect-ratio:3/4}
  .campus-gallery-secondary{grid-column:1;grid-template-columns:1fr}
  .campus-gallery-secondary .campus-photo{aspect-ratio:3/2}
  .campus-photo figcaption{left:18px;right:18px;bottom:16px;gap:11px}
  .campus-photo figcaption span{font-size:12px}
  .campus-photo figcaption strong{font-size:17px}

  .seiun-latest{grid-template-columns:1fr;gap:40px}
  .seiun-cover{max-width:240px;margin:0 auto}
  .toc{grid-template-columns:1fr}
  .seiun-actions{flex-direction:column;align-items:stretch}
  .seiun-actions .btn{width:100%}

  .yakuin-table th,.yakuin-table td{padding:14px 6px}
  .yakuin-table tbody th{width:6em}
  .committee-grid{gap:32px}

  .form-card{padding:40px 24px}
  .privacy-frame{padding:24px 6px 24px 20px}

  .page-hero{padding:60px 0 54px}
  .page-hero h1{font-size:26px}
  .seiun-hero-stream{
    inset:-125px -70px -125px 27%;opacity:.58;
    transform:rotate(-15deg);transform-origin:center;
  }
  .seiun-hero-track{animation-duration:40s}
  .seiun-hero-group{grid-template-columns:repeat(2,112px);gap:14px;padding-bottom:14px}
  .seiun-hero-cover{width:112px}
  .page-hero-seiun::after{
    background:linear-gradient(90deg,
      var(--navy-900) 0%,rgba(14,34,71,.96) 48%,
      rgba(14,34,71,.62) 73%,rgba(14,34,71,.3) 100%);
  }
  .page-hero-history::before{background-position:58% center;opacity:.28}
  .history-film-flow{inset:-112px -48px -112px 25%;transform:rotate(-15deg)}
  .history-film-track{width:250px;animation-duration:54s}
  .history-film-group{width:250px;gap:10px;padding:16px 25px}
  .history-film-group::before,.history-film-group::after{width:7px;background-size:6px 13px}
  .history-film-group::before{left:8px}
  .history-film-group::after{right:8px}
  .history-film-frame{height:88px;border-width:3px}
  .history-film-frame figcaption{right:6px;bottom:5px;padding:2px 4px;font-size:6.5px}
  .page-hero-history::after{
    background:linear-gradient(90deg,
      var(--navy-900) 0%,rgba(14,34,71,.94) 56%,rgba(14,34,71,.42) 100%);
  }

  .timeline::before{left:16px}
  .tl-item{padding:0 0 36px 48px}
  .tl-item::before{left:12px}
  .tl-year{
    position:static;width:auto;text-align:left;margin-bottom:10px;font-size:23px;
  }
  .tl-year small{display:inline;margin-left:10px}

  /* mobile fixed bottom bar */
  .mobile-bar{
    display:grid;grid-template-columns:repeat(3,1fr);
    position:fixed;left:0;right:0;bottom:0;z-index:95;
    background:var(--navy-950);
    padding-bottom:env(safe-area-inset-bottom);
    box-shadow:0 -4px 20px rgba(0,0,0,.3);
  }
  .mobile-bar a{
    display:flex;flex-direction:column;align-items:center;gap:3px;
    padding:10px 0 8px;color:#fff;font-size:9.5px;letter-spacing:.08em;
  }
  .mobile-bar a+a{border-left:1px solid rgba(255,255,255,.12)}
  .mobile-bar svg{width:19px;height:19px;fill:currentColor}
  body{padding-bottom:64px}
  .to-top{bottom:84px;right:14px}
  .site-footer{padding-bottom:8px}
}

@media (prefers-reduced-motion:reduce){
  .campus-memories::before{animation:none;transform:scale(1.06)}
}