/* =============================================================
   シームアライアンス株式会社 コーポレートサイト
   基調: ロゴの紺 × オフホワイト × 真鍮（罫線・キッカーのみ）
   書体: Shippori Mincho（和文見出し）/ Cormorant Garamond（欧文・数字）
         / Noto Sans JP（本文）
   ============================================================= */

:root{
  --navy:      #1c2b52;   /* ロゴの紺 */
  --navy-deep: #0e1a38;   /* ヒーロー・フッターの地 */
  --navy-soft: #2a3d6e;
  --paper:     #f9f7f2;   /* ロゴ地と同系のオフホワイト */
  --surface:   #ffffff;
  --ink:       #232838;
  --muted:     #5c6270;
  --brass:     #a8894e;   /* 真鍮（罫線・装飾用）。面では使わない */
  --brass-text:#866b35;   /* 真鍮の文字用。paper上でコントラスト4.5:1を満たす */
  --brass-soft:#c8b183;
  --rule:      #ddd8cc;
  --serif-ja:  "Shippori Mincho","Hiragino Mincho ProN","Yu Mincho","YuMincho",serif;
  --serif-en:  "Cormorant Garamond","Georgia",serif;
  --sans:      "Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic Medium","Yu Gothic",Meiryo,sans-serif;
  --max: 1080px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  font-weight:400;
  line-height:2.0;
  letter-spacing:.04em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}

/* 改行制御: pc=PC幅のみ改行 / sp=スマホ幅のみ改行 */
.pc{display:none}
@media (min-width:768px){ .pc{display:inline} .sp{display:none} }

/* ---------------- ヘッダー ---------------- */
.site-head{
  position:fixed; inset:0 0 auto 0; z-index:100;
  background:rgba(249,247,242,0);
  transition:background .4s, box-shadow .4s;
}
.site-head.is-scrolled{
  background:rgba(249,247,242,.92);
  backdrop-filter:blur(8px);
  box-shadow:0 1px 0 var(--rule);
}
.head-inner{
  max-width:var(--max); margin:0 auto;
  padding:18px 24px;
  display:flex; align-items:center; justify-content:space-between; gap:24px;
}
.head-logo{display:flex;align-items:center;gap:14px}
.head-logo img{width:auto;height:32px}
.head-name{
  font-family:var(--serif-ja);font-size:15.5px;font-weight:600;
  letter-spacing:.12em;white-space:nowrap;
}
/* ヒーロー（紺地）に重なっている間はロゴ・ナビを白に */
.site-head:not(.is-scrolled) .head-logo img{filter:brightness(0) invert(1)}
.site-head:not(.is-scrolled){color:#fff}
.site-head.is-scrolled{color:var(--navy)}
.head-nav{display:flex;align-items:center;gap:28px;font-size:13px;letter-spacing:.14em}
.head-nav a{font-family:var(--serif-en);font-size:15px;font-weight:500}
.head-nav a:not(.head-cta){position:relative;padding:4px 0}
.head-nav a:not(.head-cta)::after{
  content:""; position:absolute; left:0; bottom:0; width:100%; height:1px;
  background:var(--brass); transform:scaleX(0); transform-origin:right;
  transition:transform .35s;
}
.head-nav a:not(.head-cta):hover::after{transform:scaleX(1);transform-origin:left}
.head-cta{
  font-family:var(--sans) !important; font-size:13px !important; font-weight:500;
  border:1px solid currentColor; padding:9px 22px; letter-spacing:.12em;
  white-space:nowrap; flex:none;
  transition:background .3s,color .3s,border-color .3s;
}
.site-head.is-scrolled .head-cta{border-color:var(--navy);color:var(--navy)}
.head-cta:hover{background:var(--navy);border-color:var(--navy);color:#fff !important}
a:focus-visible{outline:2px solid var(--brass-soft);outline-offset:4px}
.head-nav a:not(.head-cta):focus-visible::after{transform:scaleX(1)}
@media (max-width:900px){
  .head-nav a:not(.head-cta){display:none}
}
@media (max-width:480px){
  .head-name{display:none}
  .head-logo img{height:30px}
}

/* ---------------- ヒーロー ---------------- */
.hero{
  position:relative;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(58,80,140,.55), transparent 60%),
    linear-gradient(165deg, #16244a 0%, var(--navy-deep) 62%, #0a1329 100%);
  color:#fff;
  min-height:92vh;
  display:flex; align-items:center;
  overflow:hidden;
}
.hero-inner{
  max-width:var(--max); margin:0 auto; width:100%;
  padding:160px 24px 120px;
  position:relative; z-index:2;
}
.hero-kicker{
  font-family:var(--serif-en);
  font-size:15px; font-weight:500; letter-spacing:.42em;
  color:var(--brass-soft);
  margin-bottom:34px;
  display:flex; align-items:center; gap:18px;
}
.hero-kicker::before{content:"";width:56px;height:1px;background:var(--brass)}
.hero-title{
  font-family:var(--serif-ja);
  font-size:clamp(38px, 6.2vw, 66px);
  font-weight:600;
  line-height:1.55;
  letter-spacing:.08em;
  margin-bottom:40px;
}
.hero-lead{
  font-size:15px; line-height:2.3; letter-spacing:.06em;
  color:rgba(255,255,255,.78);
  margin-bottom:52px;
}
.hero-cta{
  display:inline-flex; align-items:center; gap:16px;
  font-family:var(--serif-ja); font-size:15px; letter-spacing:.2em;
  color:#fff;
  border:1px solid rgba(255,255,255,.45);
  padding:17px 46px;
  transition:background .35s,border-color .35s;
  position:relative;
}
.hero-cta::after{content:"→";font-family:var(--serif-en);transition:transform .35s}
.hero-cta:hover{background:rgba(168,137,78,.22);border-color:var(--brass-soft)}
.hero-cta:hover::after{transform:translateX(6px)}
/* 幾何学オーナメント: ヒーロー右側。精密計器モチーフ */
.hero-art{
  position:absolute; z-index:1;
  top:50%; right:-3%;
  transform:translateY(-46%);
  width:min(48vw, 700px);
  aspect-ratio:1;
  pointer-events:none;
}
.hero-art svg{width:100%;height:100%;display:block;overflow:visible}
.art-spin, .art-spin-rev, .art-spin-slow{transform-origin:400px 400px}
.art-spin{animation:art-rot 46s linear infinite}
.art-spin-rev{animation:art-rot 34s linear infinite reverse}
.art-spin-slow{animation:art-rot 160s linear infinite}
@keyframes art-rot{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion: reduce){
  .art-spin,.art-spin-rev,.art-spin-slow{animation:none}
}
@media (max-width:767px){
  .hero{min-height:auto}
  .hero-inner{padding:140px 24px 96px}
  .hero-lead{font-size:14px}
  /* スマホは本文の背後にごく薄く敷く */
  .hero-art{right:-30%;width:110vw;opacity:.35;transform:translateY(-50%)}
}

/* ---------------- 実績数字 ---------------- */
.stats{background:var(--navy-deep);color:#fff;border-top:1px solid rgba(200,177,131,.35)}
.stats-inner{
  max-width:var(--max); margin:0 auto;
  padding:64px 24px;
  display:grid; grid-template-columns:repeat(3,1fr); gap:32px;
}
.stat{text-align:center;position:relative}
.stat + .stat::before{
  content:""; position:absolute; left:-16px; top:8%; bottom:8%;
  width:1px; background:rgba(255,255,255,.16);
}
.stat-num{font-family:var(--serif-en);color:var(--brass-soft);line-height:1;margin-bottom:14px}
.stat-num .n{font-size:clamp(44px,5.4vw,64px);font-weight:500}
.stat-num .u{font-family:var(--serif-ja);font-size:clamp(17px,2vw,22px);margin-left:6px}
.stat-label{font-size:12.5px;line-height:1.9;letter-spacing:.08em;color:rgba(255,255,255,.72)}
.stats-note{
  max-width:var(--max);margin:0 auto;padding:0 24px 48px;
  font-size:12px;letter-spacing:.06em;color:rgba(255,255,255,.62);
  text-align:center;
}
@media (max-width:767px){
  .stats-inner{grid-template-columns:1fr;gap:36px;padding:56px 24px}
  .stat + .stat::before{left:20%;right:20%;top:-18px;bottom:auto;width:auto;height:1px}
}

/* ---------------- セクション共通 ---------------- */
.section{padding:clamp(80px,9vw,120px) 24px}
.section-inner{max-width:var(--max);margin:0 auto}
.sec-head{margin-bottom:clamp(48px,6vw,72px)}
.sec-kicker{
  font-family:var(--serif-en);
  font-size:14px; font-weight:500; letter-spacing:.38em;
  color:var(--brass-text);
  margin-bottom:18px;
  display:flex; align-items:center; gap:14px;
}
.sec-kicker::before{content:"";width:40px;height:1px;background:var(--brass)}
.sec-title{
  font-family:var(--serif-ja);
  font-size:clamp(26px,3.6vw,38px);
  font-weight:600;
  line-height:1.7;
  letter-spacing:.1em;
  color:var(--navy);
}
.sec-lead{margin-top:22px;font-size:14.5px;color:var(--muted);letter-spacing:.06em}

/* ---------------- Philosophy ---------------- */
.philosophy{background:var(--paper)}
.philosophy .section-inner{
  display:grid; grid-template-columns:minmax(0,5fr) minmax(0,7fr); gap:64px;
  align-items:start;
}
.philosophy .sec-head{margin-bottom:0}
.philosophy-body{
  font-size:15.5px; line-height:2.4; letter-spacing:.06em;
  border-left:1px solid var(--rule);
  padding-left:48px;
}
.philosophy-body p + p{margin-top:2em}
@media (max-width:900px){
  .philosophy .section-inner{grid-template-columns:1fr;gap:40px}
  .philosophy-body{border-left:none;padding-left:0;border-top:1px solid var(--rule);padding-top:40px}
}

/* ---------------- Services ---------------- */
.services{background:var(--surface);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.phase-list{
  list-style:none;
  display:grid; grid-template-columns:repeat(3,1fr); gap:1px;
  background:var(--rule);
  border:1px solid var(--rule);
}
.phase{
  background:var(--surface);
  padding:44px 36px 40px;
  position:relative;
  transition:background .35s;
}
.phase:hover{background:var(--paper)}
.phase-num{
  font-family:var(--serif-en);
  font-size:15px; font-weight:500; letter-spacing:.2em;
  color:var(--brass-text);
  margin-bottom:20px;
  display:flex; align-items:center; gap:12px;
}
.phase-num::after{content:"";flex:1;height:1px;background:var(--rule)}
.phase-name{
  font-family:var(--serif-ja);
  font-size:19px; font-weight:600; letter-spacing:.08em;
  color:var(--navy);
  margin-bottom:16px;
  line-height:1.6;
}
.phase-desc{font-size:13.5px;line-height:2.1;color:var(--muted);letter-spacing:.04em}
@media (max-width:900px){ .phase-list{grid-template-columns:repeat(2,1fr)} }
@media (max-width:600px){ .phase-list{grid-template-columns:1fr} .phase{padding:36px 28px 32px} }

/* ---------------- Strength ---------------- */
.strength{background:var(--paper)}
.strength-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.strength-card{
  border-left:1px solid var(--rule);
  padding:10px 40px 8px;
}
.strength-card:first-child{border-left:none;padding-left:0}
.strength-card:last-child{padding-right:0}
.strength-num{
  font-family:var(--serif-en);
  font-size:36px; font-weight:400; font-style:italic;
  color:var(--brass-text);
  margin-bottom:24px;
  line-height:1;
}
.strength-card h3{
  font-family:var(--serif-ja);
  font-size:18.5px; font-weight:600; letter-spacing:.06em;
  line-height:1.8;
  color:var(--navy);
  margin-bottom:18px;
}
.strength-card p{font-size:13.5px;line-height:2.1;color:var(--muted);letter-spacing:.04em}
@media (max-width:900px){
  .strength-grid{grid-template-columns:1fr;gap:36px}
  .strength-card{border-left:none;border-top:1px solid var(--rule);padding:32px 0 0}
  .strength-card:first-child{border-top:none;padding-top:0}
}

/* ---------------- 代表紹介 ---------------- */
.president{background:var(--surface);border-top:1px solid var(--rule)}
.president-grid{
  display:grid; grid-template-columns:minmax(0,4fr) minmax(0,7fr); gap:72px;
  align-items:start;
}
.president-photo{position:relative;margin:0 0 0 16px}
.president-photo::before{
  /* 額装風: 背面に紺の面をオフセットして敷く */
  content:""; position:absolute; inset:24px -16px -16px 24px;
  background:var(--navy);
  z-index:0;
}
.president-photo img{position:relative;z-index:1;width:100%;border:1px solid var(--rule)}
.president-role{
  font-size:13px;letter-spacing:.22em;color:var(--brass-text);
  margin-bottom:10px;font-weight:500;
}
.president-name{
  font-family:var(--serif-ja);
  font-size:34px;font-weight:600;letter-spacing:.14em;
  color:var(--navy);
  margin-bottom:28px;
  display:flex;align-items:baseline;gap:18px;flex-wrap:wrap;
}
.president-name .en{
  font-family:var(--serif-en);
  font-size:15px;font-weight:500;letter-spacing:.18em;
  color:var(--muted);
}
.president-text{font-size:14.5px;line-height:2.3;letter-spacing:.05em;margin-bottom:40px}
.career{list-style:none;border-top:1px solid var(--rule)}
.career li{
  display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px;
  padding:20px 4px;
  border-bottom:1px solid var(--rule);
  font-size:13.5px;line-height:1.9;
}
.career .c-org{font-weight:700;color:var(--navy);letter-spacing:.04em}
.career .c-role{color:var(--muted)}
@media (max-width:900px){
  .president-grid{grid-template-columns:1fr;gap:56px}
  .president-photo{max-width:380px}
  .career li{grid-template-columns:1fr;gap:6px}
}

/* ---------------- 会社概要 ---------------- */
.company{background:var(--paper)}
.company-table{max-width:760px;border-top:1px solid var(--rule)}
.company-table > div{
  display:grid;grid-template-columns:180px 1fr;gap:24px;
  padding:22px 8px;
  border-bottom:1px solid var(--rule);
  font-size:14.5px;
}
.company-table dt{font-weight:700;color:var(--navy);letter-spacing:.08em}
.company-table dd{letter-spacing:.05em}
@media (max-width:600px){
  .company-table > div{grid-template-columns:96px 1fr;gap:16px;font-size:13.5px}
}

/* ---------------- Contact ---------------- */
.contact{
  background:
    radial-gradient(900px 500px at 15% 110%, rgba(58,80,140,.5), transparent 60%),
    linear-gradient(200deg, #16244a 0%, var(--navy-deep) 70%);
  color:#fff;
}
.contact .section-inner{text-align:center}
.contact .sec-title{color:#fff}
.contact .sec-kicker{color:var(--brass-soft);justify-content:center}
.contact .sec-kicker::after{content:"";width:40px;height:1px;background:var(--brass)}
.contact-body{max-width:640px;margin:0 auto}
.contact-body > p{font-size:15px;line-height:2.3;color:rgba(255,255,255,.82);margin-bottom:44px}
.contact-btn{
  display:inline-flex;align-items:center;gap:16px;
  font-family:var(--serif-ja);font-size:15.5px;letter-spacing:.16em;
  background:#fff;color:var(--navy);
  border:none;cursor:pointer;
  padding:19px 52px;
  transition:background .3s,color .3s,opacity .3s;
}
.contact-btn::after{content:"→";font-family:var(--serif-en);transition:transform .35s}
.contact-btn:hover{background:var(--brass-soft);color:var(--navy-deep)}
.contact-btn:hover::after{transform:translateX(6px)}
.contact-btn:disabled{opacity:.5;cursor:default}
.contact-form{margin:8px auto 0;max-width:640px;text-align:left}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media (max-width:600px){ .form-row{grid-template-columns:1fr} }
.form-field{display:block;margin-bottom:22px}
.form-label{
  display:flex;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.14em;color:rgba(255,255,255,.75);
  margin-bottom:8px;
}
.form-label em{
  font-style:normal;font-size:10.5px;letter-spacing:.08em;
  color:var(--brass-soft);border:1px solid rgba(200,177,131,.5);
  padding:1px 6px;
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea{
  width:100%;box-sizing:border-box;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.28);
  color:#fff;
  font-family:var(--sans);font-size:15px;letter-spacing:.03em;
  padding:13px 14px;
  border-radius:0;
  transition:border-color .3s,background .3s;
}
.contact-form textarea{resize:vertical;line-height:1.9}
.contact-form input:focus,
.contact-form textarea:focus{
  outline:none;border-color:var(--brass-soft);background:rgba(255,255,255,.1);
}
.form-hp{position:absolute;left:-9999px;top:auto;height:1px;width:1px;overflow:hidden}
.contact-form .contact-btn{margin-top:6px}
.form-status{margin-top:16px;font-size:13.5px;line-height:1.9;color:rgba(255,255,255,.85);min-height:1.5em}
.contact-addr{
  margin-top:28px;
  font-size:13px;letter-spacing:.08em;
  color:rgba(255,255,255,.6);
}
.contact-addr a{
  font-family:var(--serif-en);font-size:14.5px;letter-spacing:.06em;
  color:rgba(255,255,255,.85);
  border-bottom:1px solid rgba(255,255,255,.35);
  padding-bottom:1px;
}
.contact-addr a:hover{color:var(--brass-soft);border-color:var(--brass-soft)}

/* ---------------- フッター ---------------- */
.site-foot{background:var(--navy-deep);color:#fff;border-top:1px solid rgba(255,255,255,.12)}
.foot-inner{
  max-width:var(--max);margin:0 auto;
  padding:48px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
}
.foot-logo{width:164px;height:auto;opacity:.92}
.foot-copy{font-family:var(--serif-en);font-size:12.5px;letter-spacing:.14em;color:rgba(255,255,255,.5)}

/* ---------------- 出現アニメーション ----------------
   JS無効時にも本文が見えるよう、隠すのは .js が付いたときだけ */
.reveal{opacity:1;transform:none;transition:opacity .9s ease,transform .9s ease}
.js .reveal{opacity:0;transform:translateY(28px)}
.js .reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
}

/* ---------------- スマホの文字詰め ---------------- */
@media (max-width:600px){
  body{letter-spacing:.02em}
  .sec-title{font-size:23px;letter-spacing:.05em}
  .philosophy-body{line-height:2.15;letter-spacing:.025em}
  .president-text{line-height:2.15;letter-spacing:.025em}
}