/* =========================================================
   蒼海リサーチ（仮）  —  コーポレートサイト ご提案用デモ
   LIXデザイン / 坂倉
   ※ 写真に頼らず、文字・余白・罫線・図で専門性と信頼感を出す設計
   ========================================================= */

:root{
  /* ---- コーポレートカラー（1変数で差し替え可能）---- */
  --brand:#0E3A55;        /* 深い海の青（貴社指定色に置換）*/
  --brand-d:#0A2B40;
  --brand-l:#E7EEF2;
  --accent:#1C8C9B;       /* 差し色（データ・アクセント）*/
  --accent-l:#E3F1F2;

  --ink:#1B2A33;
  --ink-l:#5A6B75;
  --ink-xl:#8A99A1;
  --paper:#FFFFFF;
  --paper-2:#F5F8F9;
  --paper-3:#EDF2F4;
  --line:#DCE4E8;
  --line-2:#E8EDF0;

  --r:6px;
  --maxw:1120px;
  --shadow:0 18px 46px rgba(14,58,85,.10);
  --shadow-s:0 8px 24px rgba(14,58,85,.07);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
html,body{overflow-x:hidden;max-width:100%;}
img,svg{max-width:100%;display:block;}
p,li,td,th,dd{overflow-wrap:anywhere;}
h1,h2,h3,h4,h5{word-break:keep-all;overflow-wrap:normal;}

body{
  margin:0;
  font-family:"Zen Kaku Gothic New","Hiragino Sans","Meiryo",sans-serif;
  font-weight:400;
  color:var(--ink);
  background:var(--paper);
  line-height:1.95;
  letter-spacing:.04em;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-weight:700;line-height:1.6;letter-spacing:.02em;}
.en{font-family:"Outfit","Zen Kaku Gothic New",sans-serif;letter-spacing:.16em;text-transform:uppercase;font-weight:500;}
a{color:inherit;text-decoration:none;}
strong,b{font-weight:700;}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:28px;}
.wrap-n{max-width:840px;margin-inline:auto;padding-inline:28px;}
section{padding:110px 0;position:relative;}
.tac{text-align:center;}
.lead{font-size:clamp(1.05rem,2.4vw,1.24rem);line-height:2.1;color:var(--ink);font-weight:400;}

/* ---------- リビール ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1);}
.reveal.in{opacity:1;transform:none;}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;}
  .reveal{opacity:1;transform:none;transition:none;}
  html{scroll-behavior:auto;}
}

/* ---------- 帯（デモ表示）---------- */
.demo-ribbon{background:var(--brand-d);color:#fff;text-align:center;font-size:.75rem;padding:8px 16px;letter-spacing:.05em;}
.demo-ribbon b{color:#fff;}

/* ---------- ヘッダー ---------- */
header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.hbar{display:flex;align-items:center;justify-content:space-between;padding:16px 28px;max-width:var(--maxw);margin-inline:auto;}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink);}
.logo .mark{width:38px;height:38px;flex:none;}
.logo .wm{display:flex;flex-direction:column;line-height:1.2;}
.logo .wm b{font-size:1.12rem;letter-spacing:.06em;font-weight:700;}
.logo .wm .en{font-size:.56rem;color:var(--ink-xl);letter-spacing:.24em;margin-top:2px;}
.gnav{display:flex;gap:32px;align-items:center;font-size:.88rem;letter-spacing:.06em;}
.gnav a{position:relative;padding:8px 0;color:var(--ink-l);transition:color .2s;white-space:nowrap;}
.gnav a:hover,.gnav a[aria-current="page"]{color:var(--brand);}
.gnav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--accent);transform:scaleX(0);transition:transform .25s;transform-origin:left;}
.gnav a:hover::after,.gnav a[aria-current="page"]::after{transform:scaleX(1);}
.gnav .btn{padding:.55rem 1.3rem;font-size:.82rem;}
.gnav .btn::after{display:none;}
.navbtn{display:none;border:1px solid var(--line);background:var(--paper);width:44px;height:44px;border-radius:var(--r);font-size:1.2rem;color:var(--ink);line-height:1;cursor:pointer;}
.mnav{display:none;flex-direction:column;background:var(--paper);border-top:1px solid var(--line);}
.mnav.open{display:flex;}
.mnav a{padding:15px 28px;border-bottom:1px solid var(--line-2);color:var(--ink);font-size:.94rem;}
.mnav a[aria-current="page"]{color:var(--brand);border-left:3px solid var(--accent);}

/* ---------- ボタン ---------- */
.btn{display:inline-flex;align-items:center;gap:.55rem;border-radius:var(--r);padding:1rem 2rem;font-weight:700;font-size:.9rem;letter-spacing:.05em;cursor:pointer;border:1px solid transparent;transition:transform .16s,box-shadow .16s,background .16s,color .16s;}
.btn-fill{background:var(--brand);color:#fff;}
.btn-fill:hover{background:var(--brand-d);transform:translateY(-2px);box-shadow:var(--shadow-s);}
.btn-line{border-color:var(--brand);color:var(--brand);background:transparent;}
.btn-line:hover{background:var(--brand);color:#fff;transform:translateY(-2px);}
.btn-sm{padding:.62rem 1.3rem;font-size:.82rem;}
.btn .ar{transition:transform .16s;}
.btn:hover .ar{transform:translateX(3px);}
.btns{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- セクション見出し ---------- */
.shead{margin-bottom:56px;}
.shead.c{text-align:center;}
.shead .en{display:block;color:var(--accent);font-size:.72rem;margin-bottom:.8rem;}
.shead h2{font-size:clamp(1.5rem,3.4vw,2.05rem);margin:0;font-weight:700;letter-spacing:.03em;}
.shead .sub{color:var(--ink-l);font-size:.94rem;margin-top:1rem;line-height:2;}
.shead.c .sub{margin-inline:auto;max-width:40em;}
.eyebrow{display:inline-flex;align-items:center;gap:.6rem;color:var(--accent);font-size:.72rem;letter-spacing:.16em;font-weight:600;text-transform:uppercase;font-family:"Outfit",sans-serif;}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--accent);}

/* =========================================================
   トップ ヒーロー  —  等深線（bathymetry）ラインで海を表現
   ========================================================= */
.hero{position:relative;background:linear-gradient(180deg,var(--brand) 0%,var(--brand-d) 100%);color:#fff;overflow:hidden;padding:132px 0 124px;}
.hero .contour{position:absolute;inset:0;width:100%;height:100%;opacity:.5;pointer-events:none;}
.hero .wrap{position:relative;z-index:2;}
.hero .en{color:rgba(255,255,255,.7);font-size:.76rem;}
.hero h1{font-size:clamp(2rem,5.4vw,3.5rem);line-height:1.5;margin:1.1rem 0 1.6rem;letter-spacing:.04em;font-weight:700;}
.hero h1 .thin{display:block;font-size:.42em;letter-spacing:.14em;color:rgba(255,255,255,.78);font-weight:500;margin-top:1rem;}
.hero p{font-size:clamp(1rem,2.2vw,1.14rem);color:rgba(255,255,255,.82);max-width:34em;margin:0 0 2.6rem;font-weight:400;line-height:2.1;}
.hero .btns .btn-fill{background:#fff;color:var(--brand);}
.hero .btns .btn-fill:hover{background:var(--accent-l);}
.hero .btns .btn-line{border-color:rgba(255,255,255,.5);color:#fff;}
.hero .btns .btn-line:hover{background:rgba(255,255,255,.12);}
.hero-copy>*{opacity:0;transform:translateY(18px);animation:rise .8s cubic-bezier(.2,.7,.2,1) forwards;}
.hero-copy .en{animation-delay:.05s;}
.hero-copy h1{animation-delay:.16s;}
.hero-copy p{animation-delay:.3s;}
.hero-copy .btns{animation-delay:.42s;}
@keyframes rise{to{opacity:1;transform:none;}}

/* ---- ヒーロー下：指標バー ---- */
.metrics{background:var(--brand-d);color:#fff;border-top:1px solid rgba(255,255,255,.12);}
.metrics .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.12);padding:0;}
.metric{background:var(--brand-d);padding:34px 24px;text-align:center;}
.metric b{display:block;font-family:"Outfit",sans-serif;font-size:2rem;font-weight:600;letter-spacing:.02em;line-height:1.1;}
.metric b .u{font-size:.5em;margin-left:.15em;font-weight:500;color:rgba(255,255,255,.75);}
.metric span{display:block;font-size:.78rem;color:rgba(255,255,255,.7);margin-top:.5rem;letter-spacing:.06em;}

/* ---------- イントロ（文章主体）---------- */
.intro{background:var(--paper);}
.intro .wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:start;}
.intro h2{font-size:clamp(1.4rem,3vw,1.9rem);margin:0;line-height:1.7;}
.intro .body p{margin:0 0 1.3rem;color:var(--ink-l);}
.intro .body p:last-child{margin-bottom:0;}
.intro .sign{margin-top:2rem;font-size:.86rem;color:var(--ink-xl);}

/* ---------- 事業内容カード ---------- */
.svc{background:var(--paper-2);}
.svc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.svc-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:40px 36px;transition:border-color .2s,box-shadow .2s,transform .2s;}
.svc-card:hover{border-color:var(--accent);box-shadow:var(--shadow-s);transform:translateY(-3px);}
.svc-card .no{font-family:"Outfit",sans-serif;font-size:.8rem;color:var(--accent);letter-spacing:.1em;font-weight:600;}
.svc-card h3{font-size:1.16rem;margin:.5rem 0 .9rem;}
.svc-card p{margin:0;font-size:.9rem;color:var(--ink-l);line-height:1.95;}
.svc-card .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:1.2rem;}
.svc-card .tags span{font-size:.74rem;color:var(--ink-l);background:var(--paper-3);border-radius:3px;padding:.2rem .6rem;letter-spacing:.03em;}

/* ---------- 調査フロー（図・写真不使用）---------- */
.flow{background:var(--paper);}
.flow-steps{display:grid;grid-template-columns:repeat(6,1fr);gap:0;counter-reset:step;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;}
.flow-step{padding:30px 20px;border-right:1px solid var(--line);position:relative;}
.flow-step:last-child{border-right:none;}
.flow-step .n{font-family:"Outfit",sans-serif;font-size:.76rem;color:var(--accent);font-weight:600;letter-spacing:.1em;}
.flow-step h4{font-size:.96rem;margin:.5rem 0 .4rem;line-height:1.6;}
.flow-step p{font-size:.78rem;color:var(--ink-l);margin:0;line-height:1.8;}

/* ---------- 保有機材テーブル ---------- */
.equip{background:var(--paper-2);}
.equip-table{width:100%;border-collapse:collapse;font-size:.9rem;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;}
.equip-table thead th{background:var(--brand);color:#fff;text-align:left;padding:16px 20px;font-size:.82rem;letter-spacing:.06em;font-weight:600;}
.equip-table td{padding:16px 20px;border-top:1px solid var(--line-2);vertical-align:top;color:var(--ink-l);}
.equip-table td:first-child{color:var(--ink);font-weight:700;white-space:nowrap;}
.equip-table tbody tr:hover{background:var(--paper-2);}

/* ---------- お知らせ ---------- */
.news .wrap{display:grid;grid-template-columns:.7fr 1.3fr;gap:56px;align-items:start;}
.news-list{border-top:1px solid var(--line);}
.news-item{display:grid;grid-template-columns:auto auto 1fr;gap:20px;align-items:baseline;padding:20px 4px;border-bottom:1px solid var(--line);transition:background .16s;}
.news-item:hover{background:var(--paper-2);}
.news-item time{font-family:"Outfit",sans-serif;font-size:.82rem;color:var(--ink-xl);letter-spacing:.04em;}
.news-item .cat{font-size:.7rem;color:var(--accent);border:1px solid var(--accent);border-radius:3px;padding:.1rem .5rem;letter-spacing:.04em;justify-self:start;}
.news-item p{margin:0;font-size:.9rem;}

/* ---------- CTA ---------- */
.cta{background:var(--brand);color:#fff;text-align:center;}
.cta .contour{position:absolute;inset:0;opacity:.35;pointer-events:none;}
.cta .wrap{position:relative;z-index:2;}
.cta h2{font-size:clamp(1.4rem,3.4vw,2rem);margin:0 0 1rem;}
.cta p{color:rgba(255,255,255,.82);margin:0 0 2.2rem;font-size:.94rem;}
.cta .btn-fill{background:#fff;color:var(--brand);}
.cta .btn-fill:hover{background:var(--accent-l);}
.cta .btn-line{border-color:rgba(255,255,255,.5);color:#fff;}
.cta .btn-line:hover{background:rgba(255,255,255,.12);}

/* =========================================================
   下層ページ 共通
   ========================================================= */
.phero{background:var(--brand);color:#fff;padding:76px 0 68px;position:relative;overflow:hidden;}
.phero .contour{position:absolute;inset:0;opacity:.4;pointer-events:none;}
.phero .wrap{position:relative;z-index:2;}
.phero .en{color:rgba(255,255,255,.65);font-size:.74rem;}
.phero h1{font-size:clamp(1.7rem,4vw,2.5rem);margin:.7rem 0 0;font-weight:700;letter-spacing:.04em;}
.phero p{color:rgba(255,255,255,.8);margin:.9rem 0 0;max-width:38em;font-size:.95rem;}
.crumb{background:var(--paper-2);border-bottom:1px solid var(--line);}
.crumb .wrap{padding-block:14px;font-size:.78rem;color:var(--ink-l);letter-spacing:.04em;}
.crumb a:hover{color:var(--brand);}
.crumb span{margin:0 .5em;opacity:.5;}

/* 交互ブロック（事業内容 詳細）*/
.alt{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start;}
.alt + .alt{margin-top:80px;padding-top:80px;border-top:1px solid var(--line);}
.alt .no{font-family:"Outfit",sans-serif;font-size:2.4rem;color:var(--paper-3);font-weight:700;line-height:1;}
.alt h2{font-size:clamp(1.3rem,2.8vw,1.7rem);margin:.6rem 0 1.2rem;}
.alt p{color:var(--ink-l);margin:0 0 1rem;}
.alt ul{margin:1.4rem 0 0;padding:0;list-style:none;border-top:1px solid var(--line);}
.alt ul li{position:relative;padding:.8rem 0 .8rem 1.6em;font-size:.88rem;color:var(--ink-l);border-bottom:1px solid var(--line-2);}
.alt ul li::before{content:"";position:absolute;left:0;top:1.35em;width:8px;height:8px;background:var(--accent);border-radius:2px;}

/* 数値カード（信頼感の可視化）*/
.figs{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.fig{border:1px solid var(--line);border-radius:var(--r);padding:32px 28px;}
.fig b{font-family:"Outfit",sans-serif;font-size:2.1rem;font-weight:600;color:var(--brand);display:block;line-height:1.1;}
.fig span{font-size:.84rem;color:var(--ink-l);display:block;margin-top:.5rem;}

/* 会社概要テーブル */
.tbl{width:100%;border-collapse:collapse;font-size:.92rem;border-top:2px solid var(--brand);}
.tbl th,.tbl td{text-align:left;padding:18px 4px;border-bottom:1px solid var(--line);vertical-align:top;}
.tbl th{width:26%;color:var(--ink);font-weight:700;}
.tbl td{color:var(--ink-l);}

/* アクセス */
.access{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:stretch;}
.map-box{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;min-height:280px;background:var(--paper-3);}
.map-box iframe{width:100%;height:100%;min-height:280px;border:0;display:block;}
.access .info h3{margin:0 0 1rem;font-size:1.1rem;}
.access .info p{margin:0 0 .6rem;color:var(--ink-l);font-size:.9rem;}

/* フォーム */
.form{max-width:680px;}
.field{margin-bottom:22px;}
.field label{display:block;font-size:.86rem;color:var(--ink);margin-bottom:.5rem;font-weight:700;}
.field label .req{color:#fff;background:var(--accent);font-size:.64rem;margin-left:.5em;padding:.1rem .4rem;border-radius:3px;letter-spacing:.04em;vertical-align:middle;}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line);background:var(--paper);border-radius:var(--r);
  padding:.85rem 1rem;font:inherit;font-size:.94rem;color:var(--ink);transition:border-color .16s;
}
.field textarea{min-height:150px;resize:vertical;line-height:1.9;}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.86rem;color:var(--ink-l);}
.check input{width:auto;margin-top:.45rem;}
.form-done{display:none;background:var(--accent-l);border:1px solid var(--accent);border-radius:var(--r);padding:36px;text-align:center;}
.form-done.on{display:block;}
.form-done h3{margin:0 0 .5rem;}
.form-done p{margin:0;color:var(--ink-l);font-size:.9rem;}
.form-note{font-size:.8rem;color:var(--ink-xl);margin-top:1rem;line-height:1.9;}

/* ---------- フッター ---------- */
footer{background:var(--brand-d);color:rgba(255,255,255,.66);padding:64px 0 28px;font-size:.84rem;}
.fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;}
footer .logo{color:#fff;}
footer .logo .wm .en{color:rgba(255,255,255,.5);}
footer .fabout{margin-top:16px;max-width:24em;font-size:.82rem;line-height:1.9;}
footer h5{color:#fff;font-size:.86rem;margin:0 0 1rem;letter-spacing:.04em;}
footer .fnav{display:flex;flex-direction:column;gap:.6rem;}
footer .fnav a:hover{color:#fff;}
.fbot{margin-top:52px;padding-top:22px;border-top:1px solid rgba(255,255,255,.14);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.74rem;color:rgba(255,255,255,.5);}

/* ---------- レスポンシブ ---------- */
@media(max-width:960px){
  .svc-grid{grid-template-columns:1fr;}
  .flow-steps{grid-template-columns:repeat(3,1fr);}
  .flow-step:nth-child(3){border-right:none;}
  .flow-step:nth-child(-n+3){border-bottom:1px solid var(--line);}
  .intro .wrap,.news .wrap{grid-template-columns:1fr;gap:32px;}
  .fgrid{grid-template-columns:1fr 1fr;}
  .metrics .wrap{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:860px){
  section{padding:72px 0;}
  .gnav{display:none;}
  .navbtn{display:block;}
  .hero{padding:88px 0 84px;}
  .alt,.access{grid-template-columns:1fr;gap:28px;}
  .alt + .alt{margin-top:56px;padding-top:56px;}
  .figs{grid-template-columns:1fr;}
}
@media(max-width:560px){
  .wrap,.wrap-n{padding-inline:20px;}
  .flow-steps{grid-template-columns:repeat(2,1fr);}
  .flow-step{border-right:1px solid var(--line)!important;border-bottom:1px solid var(--line);}
  .flow-step:nth-child(2n){border-right:none!important;}
  .figs{grid-template-columns:1fr;}
  .news-item{grid-template-columns:auto 1fr;gap:8px 14px;}
  .news-item p{grid-column:1/-1;}
  .btns .btn{flex:1;justify-content:center;}
  .equip-table{font-size:.82rem;}
  .equip-table thead th,.equip-table td{padding:12px 12px;}
}