/* ==========================================================
   青空教室 LP - style.css
   ========================================================== */

:root{
  --sky:#5B9BD5;
  --sky-deep:#2E6FA6;
  --sky-soft:#EAF3FB;
  --ink:#2C2C2C;
  --ink-soft:#5A5A5A;
  --line:#E5E8EC;
  --bg:#FFFFFF;
  --bg-alt:#FAFBFC;
  --max:1160px;
  --radius:10px;
  --shadow:0 6px 24px rgba(20,40,70,.08);
  --font-jp:"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic UI","Meiryo",sans-serif;
  --font-en:"Inter",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-jp);
  color:var(--ink);
  background:var(--bg);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"palt";
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--sky-deep);text-decoration:none;}
a:hover{text-decoration:underline;}

.container{max-width:var(--max);margin:0 auto;padding:0 24px;}
.sp-only{display:none;}
@media(max-width:680px){.sp-only{display:inline;}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  -webkit-backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,#7EB6E0,#3F84C2);
  box-shadow:0 2px 8px rgba(91,155,213,.4);
  display:inline-block;
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-name{font-weight:700;font-size:18px;letter-spacing:.04em;}
.brand-sub{font-family:var(--font-en);font-size:11px;color:var(--ink-soft);letter-spacing:.1em;}
.nav{display:flex;gap:28px;}
.nav a{color:var(--ink);font-size:14px;font-weight:500;text-decoration:none;}
.nav a:hover{color:var(--sky-deep);}
@media(max-width:720px){.nav{display:none;}}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:88vh;
  display:flex;align-items:center;
  overflow:hidden;
  color:#fff;
}
.hero-bg{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  transform:scale(1.04);
  filter:brightness(.7);
}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(120deg,rgba(20,50,90,.55) 0%,rgba(91,155,213,.35) 100%);
}
.hero-content{position:relative;z-index:2;padding:80px 24px;width:100%;}
.hero-eyebrow{
  font-size:13px;letter-spacing:.18em;
  text-transform:uppercase;
  opacity:.9;margin:0 0 20px;
}
.hero-title{
  font-size:clamp(28px,5vw,52px);
  font-weight:700;
  line-height:1.4;
  margin:0 0 28px;
  letter-spacing:.02em;
  text-shadow:0 2px 16px rgba(0,0,0,.3);
}
.hero-lead{
  font-size:clamp(15px,1.6vw,18px);
  max-width:640px;
  line-height:2;
  margin:0 0 36px;
  text-shadow:0 1px 8px rgba(0,0,0,.3);
}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;
  padding:14px 28px;
  border-radius:999px;
  font-weight:600;font-size:14px;
  letter-spacing:.04em;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
  text-decoration:none;
}
.btn:hover{text-decoration:none;transform:translateY(-1px);}
.btn-primary{
  background:var(--sky);color:#fff;
  box-shadow:0 6px 20px rgba(91,155,213,.45);
}
.btn-primary:hover{background:var(--sky-deep);}
.btn-ghost{
  background:rgba(255,255,255,.12);
  color:#fff;
  border:1px solid rgba(255,255,255,.5);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{background:rgba(255,255,255,.22);}
.btn-white{
  background:#fff;color:var(--sky-deep);
  font-family:var(--font-en);
  box-shadow:0 6px 20px rgba(0,0,0,.18);
  padding:16px 36px;font-size:16px;
}
.btn-white:hover{background:var(--sky-soft);}

/* ---------- Section base ---------- */
.section{padding:96px 0;}
.section-alt{background:var(--bg-alt);}
@media(max-width:680px){.section{padding:64px 0;}}

.section-head{text-align:center;margin-bottom:56px;}
.eyebrow{
  font-family:var(--font-en);
  font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sky-deep);
  margin:0 0 12px;font-weight:600;
}
.eyebrow-light{color:rgba(255,255,255,.85);}
.section-title{
  font-size:clamp(24px,3.4vw,36px);
  font-weight:700;
  margin:0 0 16px;
  letter-spacing:.04em;
}
.section-title-light{color:#fff;}
.section-desc{
  color:var(--ink-soft);
  max-width:640px;margin:0 auto;
}

.lead{font-size:17px;line-height:2;margin:0 0 20px;}

/* ---------- Grid 2-col ---------- */
.grid-2{
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:64px;
  align-items:center;
}
@media(max-width:860px){
  .grid-2{grid-template-columns:1fr;gap:40px;}
}
.grid-image img{
  width:100%;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  aspect-ratio:4/3;
  object-fit:cover;
}
.rep-figure{margin:0;}
.rep-figure img{
  aspect-ratio:4/5;
  object-position:center top;
}
.rep-figure figcaption{
  text-align:center;
  font-size:14px;
  color:var(--ink-soft);
  letter-spacing:.08em;
  margin-top:14px;
}
.bullet-list{
  list-style:none;padding:0;margin:24px 0 0;
}
.bullet-list li{
  position:relative;
  padding:10px 0 10px 28px;
  border-bottom:1px solid var(--line);
}
.bullet-list li::before{
  content:"";
  position:absolute;left:4px;top:18px;
  width:10px;height:10px;border-radius:50%;
  background:var(--sky);
}

/* ---------- Band (full-width photo) ---------- */
.band{
  width:100%;
  height:42vh;min-height:280px;max-height:520px;
  overflow:hidden;
}
.band-img{
  width:100%;height:100%;
  object-fit:cover;object-position:center;
}

/* ---------- Project Card ---------- */
.project-card{
  display:grid;
  grid-template-columns:1.1fr 1fr;
  background:#fff;
  border-radius:16px;
  overflow:hidden;
  box-shadow:0 10px 40px rgba(20,50,90,.1);
  margin-bottom:48px;
}
@media(max-width:860px){.project-card{grid-template-columns:1fr;}}

.project-card-media{position:relative;min-height:320px;}
.project-card-media img{
  width:100%;height:100%;object-fit:cover;position:absolute;inset:0;
}
.project-badge{
  position:absolute;top:20px;left:20px;
  background:var(--sky-deep);color:#fff;
  font-size:12px;font-weight:600;
  padding:8px 16px;border-radius:999px;
  letter-spacing:.04em;
  box-shadow:0 4px 14px rgba(0,0,0,.2);
  z-index:2;
}
.project-card-body{padding:48px 40px;}
@media(max-width:680px){.project-card-body{padding:32px 24px;}}

.project-name-en{
  font-family:var(--font-en);
  font-size:13px;letter-spacing:.2em;
  color:var(--sky-deep);
  text-transform:uppercase;
  margin:0 0 8px;font-weight:600;
}
.project-name{
  font-size:clamp(22px,2.6vw,30px);
  font-weight:700;
  margin:0 0 16px;
}
.project-catch{
  font-size:17px;
  color:var(--ink);
  background:var(--sky-soft);
  padding:14px 18px;border-radius:8px;
  border-left:4px solid var(--sky);
  margin:0 0 24px;
}
.project-meta{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px 24px;
  margin:0 0 24px;
}
@media(max-width:580px){.project-meta{grid-template-columns:1fr;}}
.project-meta>div{border-top:1px solid var(--line);padding-top:10px;}
.project-meta dt{
  font-size:11px;color:var(--ink-soft);
  letter-spacing:.1em;margin-bottom:2px;
  font-weight:600;
}
.project-meta dd{margin:0;font-size:14px;font-weight:500;}
.project-text{font-size:15px;color:var(--ink-soft);margin:0;}

/* ---------- Gallery ---------- */
.gallery{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
}
@media(max-width:860px){.gallery{grid-template-columns:repeat(2,1fr);}}
.gallery figure{margin:0;overflow:hidden;border-radius:8px;}
.gallery img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  transition:transform .4s ease;
}
.gallery figure:hover img{transform:scale(1.04);}

/* ---------- About ---------- */
.info-table{
  width:100%;
  border-collapse:collapse;
  font-size:14px;
}
.info-table th,.info-table td{
  text-align:left;
  padding:16px 12px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.info-table th{
  width:32%;
  color:var(--ink-soft);
  font-weight:500;
  font-size:13px;
  letter-spacing:.06em;
}
.info-table td{font-weight:500;}
.info-table small{color:var(--ink-soft);font-weight:400;}

/* ---------- Contact ---------- */
.section-contact{
  background:linear-gradient(135deg,var(--sky-deep) 0%,var(--sky) 100%);
  color:#fff;
  text-align:center;
}
.contact-inner{max-width:640px;}
.contact-lead{
  color:rgba(255,255,255,.92);
  font-size:16px;
  margin:0 0 32px;
}

/* ---------- Footer ---------- */
.site-footer{
  background:#1F2A36;
  color:#A8B3C0;
  padding:32px 0;
  font-size:13px;
}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:16px;
}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:600;}
.footer-brand .brand-mark{width:22px;height:22px;}
.copyright{margin:0;letter-spacing:.04em;}