/*
Theme Name: KUROSE Lab Prototype
Theme URI: https://staging.kuroselaboratory.site/
Author: KUROSE Laboratory
Description: Prototype WordPress theme for KUROSE Laboratory. Designed around Research, Collaboration, Student Projects, Achievements, People, and Contact.
Version: 0.1.0
Requires at least: 6.5
Requires PHP: 8.0
Text Domain: kurose-lab
*/

:root {
  --wine: #7d171c;
  --wine-dark: #5e1115;
  --ink: #211b1a;
  --muted: #6d6360;
  --line: #e7dfdc;
  --soft: #f7f2f0;
  --paper: #ffffff;
  --max: 1180px;
  --radius: 16px;
  --shadow: 0 14px 42px rgba(58, 29, 24, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--wine); }
img { max-width: 100%; height: auto; }

.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.eyebrow { color: var(--wine); font-size: .76rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.section { padding: 78px 0; }
.section--soft { background: linear-gradient(180deg, #fbf7f5 0%, #f7f1ef 100%); }
.section-head { display:flex; gap:32px; align-items:end; justify-content:space-between; margin-bottom:30px; }
.section-head h2 { font-family: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(2rem, 3vw, 3rem); line-height:1.2; margin:.2rem 0 0; }
.section-head p { max-width: 620px; color: var(--muted); margin:0; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(10px);
  border-top: 5px solid var(--wine);
  border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 82px; display:flex; align-items:center; justify-content:space-between; gap:26px; }
.brand { display:flex; flex-direction:column; min-width:max-content; }
.brand-title { font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.25rem, 2vw, 1.85rem); color: var(--wine-dark); line-height:1.1; }
.brand-sub { margin-top:5px; font-size:.72rem; color:#5c514e; letter-spacing:.03em; }
.site-nav { display:flex; align-items:center; gap: 24px; font-size:.88rem; font-weight:650; }
.site-nav a { padding:10px 0; }
.site-nav .contact-link { color:#fff; background:var(--wine); padding:11px 22px; border-radius:10px; }
.site-nav .contact-link:hover { background:var(--wine-dark); color:#fff; }
.nav-toggle { display:none; border:1px solid var(--line); background:#fff; border-radius:9px; padding:9px 12px; font-size:1.15rem; }

.hero { padding: 56px 0 68px; background: radial-gradient(circle at 76% 30%, #faf7f5 0, #fff 44%); }
.hero-grid { display:grid; grid-template-columns: 1.05fr .95fr; gap:44px; align-items:center; }
.hero-kicker { display:flex; align-items:center; gap:12px; color:var(--wine); font-weight:800; letter-spacing:.06em; font-size:.9rem; }
.hero-kicker::before { content:""; width:44px; height:2px; background:var(--wine); }
.hero h1 { font-family: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight:500; font-size:clamp(2.6rem,5vw,5.2rem); line-height:1.14; letter-spacing:.01em; margin:22px 0 18px; }
.hero .lead { font-size:clamp(1.05rem,1.8vw,1.38rem); font-weight:700; margin:0 0 10px; }
.hero .sublead { color:var(--muted); max-width:700px; margin:0 0 26px; }
.hero-actions { display:flex; flex-wrap:wrap; gap:12px; }
.btn { display:inline-flex; align-items:center; gap:12px; padding:12px 20px; border-radius:9px; font-weight:800; border:1px solid var(--wine); }
.btn-primary { color:#fff; background:var(--wine); }
.btn-primary:hover { background:var(--wine-dark); color:#fff; }
.btn-ghost { color:var(--wine); background:#fff; }
.hero-art { position:relative; min-height:390px; }
.hero-art .plate { position:absolute; left:50%; width:72%; height:64px; border:1px solid rgba(90,70,64,.12); box-shadow: 0 16px 30px rgba(70,50,45,.12); transform: translateX(-50%) skewY(-6deg); background:linear-gradient(135deg,#f6f6f5,#dfdeda); }
.hero-art .plate:nth-child(1){ top:44px; margin-left:35px; }
.hero-art .plate:nth-child(2){ top:108px; margin-left:-28px; background:linear-gradient(135deg,#9c262b,#64151a); }
.hero-art .plate:nth-child(3){ top:167px; margin-left:48px; }
.hero-art .plate:nth-child(4){ top:226px; margin-left:-15px; background:linear-gradient(135deg,#b0383d,#71191e); }
.hero-art .plate:nth-child(5){ top:286px; margin-left:28px; }
.hero-art .tagline { position:absolute; right:0; top:285px; width:180px; color:#8c7670; font-family:Georgia, serif; font-size:1.2rem; line-height:1.35; }

.card-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.card { background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:25px; box-shadow:0 4px 15px rgba(40,30,25,.03); }
.card .icon { width:46px; height:46px; border-radius:12px; display:grid; place-items:center; background:#f4e8e7; color:var(--wine); font-size:1.35rem; font-weight:900; margin-bottom:18px; }
.card h3 { margin:0 0 10px; font-size:1.06rem; }
.card p { margin:0; color:var(--muted); font-size:.91rem; }

.collab-grid { display:grid; grid-template-columns:.9fr 1.6fr; gap:34px; align-items:center; }
.collab-copy h2 { font-family:Georgia, "Yu Mincho", serif; font-size:clamp(2rem,3.5vw,3.2rem); line-height:1.2; margin:.25rem 0 15px; }
.collab-copy p { color:var(--muted); }
.flow { display:grid; grid-template-columns:1.05fr 1.15fr 1.05fr; gap:18px; align-items:stretch; }
.flow-core { background:linear-gradient(145deg,#9b2b31,#611318); color:#fff; border-radius:50%; aspect-ratio:1/1; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:25px; box-shadow:var(--shadow); }
.flow-core strong { font-family:Georgia, "Yu Mincho", serif; font-size:1.35rem; line-height:1.3; }
.flow-core small { margin-top:14px; opacity:.9; }
.company-stack { display:grid; gap:10px; align-content:center; }
.company { background:#fff; border:1px solid #d9ceca; border-radius:12px; padding:16px; text-align:center; font-weight:800; }
.flow-result { border:1px solid #d9ceca; border-radius:14px; background:#fff; padding:24px; display:flex; flex-direction:column; justify-content:center; }
.flow-result strong { font-size:1.1rem; margin-bottom:10px; }
.flow-result ul { margin:0; padding-left:1.2em; color:var(--muted); }

.student { display:grid; grid-template-columns:.95fr 1.65fr; gap:36px; align-items:center; }
.student h2 { font-family:Georgia, serif; font-size:clamp(2rem,3.4vw,3.1rem); margin:.25rem 0 13px; }
.student p { color:var(--muted); }
.steps { display:grid; grid-template-columns:repeat(5,1fr); gap:10px; }
.step { text-align:center; }
.step-num { margin:auto; width:62px; height:62px; border-radius:50%; display:grid; place-items:center; background:#f6eceb; color:var(--wine); font-weight:900; font-size:1.15rem; }
.step strong { display:block; margin-top:10px; font-size:.88rem; }
.step span { display:block; margin-top:3px; color:var(--muted); font-size:.78rem; }

.achievement-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.metric { min-height:180px; }
.metric .metric-big { font-family:Georgia, serif; color:var(--wine); font-size:2.3rem; line-height:1; margin:16px 0 8px; }
.metric .mini-graphic { height:70px; border-radius:10px; background:linear-gradient(165deg,#fbf6f4,#efe4e0); position:relative; overflow:hidden; }
.metric .mini-graphic::after { content:""; position:absolute; left:14px; right:14px; bottom:18px; height:2px; background:linear-gradient(90deg,#b5a7a3 0 25%, #8e1d23 25% 60%, #b5a7a3 60%); transform:skewY(-8deg); }

.news-list { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.news-item { border-top:3px solid var(--wine); padding-top:15px; }
.news-item time { color:#8a7e7a; font-size:.78rem; }
.news-item h3 { margin:7px 0 0; font-size:1rem; line-height:1.5; }

.contact-cta { display:grid; grid-template-columns:1.15fr .85fr; border-radius:20px; overflow:hidden; box-shadow:var(--shadow); }
.contact-cta .left { background:linear-gradient(135deg,#8f2027,#5f1217); color:#fff; padding:38px; }
.contact-cta .left h2 { font-family:Georgia, "Yu Mincho", serif; font-size:clamp(1.8rem,3vw,2.8rem); margin:.25rem 0 10px; }
.contact-cta .left p { margin:0; opacity:.9; }
.contact-cta .right { background:#fbf8f7; display:flex; align-items:center; justify-content:center; padding:32px; }

.site-footer { border-top:1px solid var(--line); padding:30px 0 38px; }
.footer-grid { display:flex; align-items:end; justify-content:space-between; gap:28px; }
.footer-title { font-family:Georgia, serif; color:var(--wine-dark); font-size:1.25rem; }
.footer-meta { color:var(--muted); font-size:.8rem; margin-top:4px; }
.footer-links { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:16px; color:var(--muted); font-size:.82rem; }

.page-hero { padding:68px 0 40px; background:linear-gradient(180deg,#fbf7f5,#fff); border-bottom:1px solid var(--line); }
.page-hero h1 { font-family:Georgia, "Yu Mincho", serif; font-size:clamp(2.5rem,5vw,4.5rem); margin:.4rem 0 0; }
.page-content { padding:50px 0 90px; }
.page-content > *:first-child { margin-top:0; }
.page-content h2 { font-family:Georgia, "Yu Mincho", serif; font-size:2rem; margin-top:2.2em; }
.page-content h3 { margin-top:1.8em; }
.page-content p, .page-content li { color:#423937; }

@media (max-width: 980px) {
  .hero-grid, .collab-grid, .student, .contact-cta { grid-template-columns:1fr; }
  .card-grid, .achievement-grid { grid-template-columns:repeat(2,1fr); }
  .hero-art { min-height:320px; }
  .steps { grid-template-columns:repeat(5,minmax(90px,1fr)); overflow-x:auto; padding-bottom:8px; }
  .site-nav { position:absolute; left:20px; right:20px; top:84px; display:none; background:#fff; border:1px solid var(--line); border-radius:14px; padding:14px; box-shadow:var(--shadow); flex-direction:column; align-items:stretch; gap:0; }
  .site-nav.is-open { display:flex; }
  .site-nav a { padding:11px 12px; }
  .nav-toggle { display:block; }
  .brand-sub { display:none; }
}
@media (max-width: 680px) {
  .container { width:min(calc(100% - 28px), var(--max)); }
  .section { padding:58px 0; }
  .section-head { align-items:start; flex-direction:column; gap:10px; }
  .hero { padding-top:34px; }
  .hero-grid { gap:18px; }
  .hero-art { min-height:260px; }
  .hero-art .tagline { display:none; }
  .card-grid, .achievement-grid, .news-list { grid-template-columns:1fr; }
  .flow { grid-template-columns:1fr; }
  .flow-core { width:220px; margin:auto; }
  .footer-grid { align-items:start; flex-direction:column; }
  .footer-links { justify-content:flex-start; }
}