/* スーパー英会話 ブログ共通スタイル（ブランドテーマ準拠） */
:root{
  --bg:#06060F; --bg-soft:#0B0B1E; --bg-card:#0F0F24;
  --ink:#F4F2FF; --ink-2:#A6A4CE; --ink-3:#6A6890;
  --violet:#8B5CF6; --violet-2:#A78BFA; --violet-3:#6D28D9;
  --pink:#EC4899; --cyan:#22D3EE; --amber:#FBBF24; --green:#34D399;
  --line:rgba(255,255,255,.09); --line-2:rgba(255,255,255,.14);
  --glass:rgba(255,255,255,.035);
  --maxw:760px; --maxw-wide:1160px; --r:18px;
  --grad:linear-gradient(110deg,#A78BFA 0%,#EC4899 48%,#22D3EE 100%);
  --grad-v:linear-gradient(135deg,#6D28D9,#8B5CF6);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans JP',system-ui,sans-serif;
  background:var(--bg); color:var(--ink);
  line-height:1.9; -webkit-font-smoothing:antialiased; overflow-x:hidden; position:relative;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background:
    radial-gradient(60% 50% at 10% 4%, rgba(139,92,246,.28), transparent 70%),
    radial-gradient(50% 45% at 95% 14%, rgba(34,211,238,.14), transparent 70%),
    radial-gradient(55% 50% at 70% 98%, rgba(236,72,153,.14), transparent 70%);
}
a{color:var(--violet-2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px;position:relative;z-index:2}
.wrap-wide{max-width:var(--maxw-wide);margin:0 auto;padding:0 22px;position:relative;z-index:2}
.gtext{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sp{font-family:'Space Grotesk',sans-serif}

/* NAV */
nav:not(.breadcrumb){position:sticky;top:0;z-index:60;backdrop-filter:blur(20px);
  background:rgba(6,6,15,.62);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:62px;
  max-width:var(--maxw-wide);margin:0 auto;padding:0 22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:17px}
.brand img{width:32px;height:32px;border-radius:9px;box-shadow:0 0 0 1px var(--line-2),0 8px 22px rgba(139,92,246,.4)}
.nav-links{display:flex;gap:24px;font-size:14px;font-weight:600;color:var(--ink-2)}
.nav-links a{color:var(--ink-2)}.nav-links a:hover{color:var(--ink);text-decoration:none}
.nav-cta{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:800;
  padding:9px 18px;border-radius:999px;color:#fff!important;background:var(--grad-v);
  box-shadow:0 8px 24px rgba(124,58,237,.45);transition:.2s}
.nav-cta:hover{transform:translateY(-1px);text-decoration:none}
@media(max-width:680px){.nav-links{display:none}}

/* ARTICLE */
.breadcrumb{font-size:12.5px;color:var(--ink-3);margin:26px 0 14px;letter-spacing:.01em;background:none;border:none;box-shadow:none;position:static;backdrop-filter:none;padding:0}
.breadcrumb a{color:var(--ink-3)}.breadcrumb a:hover{color:var(--ink-2)}
.eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;
  color:var(--violet-2);margin-bottom:14px}
article h1{font-size:clamp(28px,4.6vw,42px);line-height:1.28;font-weight:900;letter-spacing:-.01em;margin:6px 0 18px}
.meta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;font-size:13px;color:var(--ink-3);
  padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:8px}
.meta .tag{padding:4px 11px;border-radius:999px;background:rgba(139,92,246,.12);
  border:1px solid rgba(139,92,246,.3);color:var(--violet-2);font-weight:700;font-size:12px}
.lead{font-size:18px;color:var(--ink-2);margin:26px 0 8px;line-height:1.85}
article h2{font-size:clamp(22px,3.2vw,28px);font-weight:900;line-height:1.4;margin:48px 0 16px;
  padding-top:8px;letter-spacing:-.01em}
article h2::before{content:"";display:block;width:46px;height:4px;border-radius:4px;background:var(--grad);margin-bottom:16px}
article h3{font-size:19px;font-weight:800;margin:30px 0 12px;color:var(--ink)}
article p{margin:14px 0;color:#D9D7F2}
article strong{color:#fff;font-weight:700;background:linear-gradient(transparent 62%,rgba(139,92,246,.28) 0)}
article ul,article ol{margin:16px 0 16px 2px;padding-left:22px;color:#D9D7F2}
article li{margin:9px 0;padding-left:4px}
article li::marker{color:var(--violet-2)}

/* TOC */
.toc{background:var(--glass);border:1px solid var(--line);border-radius:var(--r);padding:20px 24px;margin:28px 0}
.toc b{display:block;font-size:13px;color:var(--ink-2);margin-bottom:10px;letter-spacing:.03em}
.toc ol{margin:0;padding-left:20px}
.toc li{margin:6px 0}
.toc a{color:var(--ink-2);font-size:14.5px}.toc a:hover{color:var(--ink)}

/* callout / table */
.callout{background:linear-gradient(135deg,rgba(139,92,246,.12),rgba(34,211,238,.06));
  border:1px solid var(--line-2);border-radius:var(--r);padding:20px 24px;margin:26px 0}
.callout b{color:var(--violet-2)}
.tbl{width:100%;border-collapse:collapse;margin:24px 0;font-size:14.5px;overflow:hidden;border-radius:14px;
  border:1px solid var(--line)}
.tbl th,.tbl td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.tbl th{background:rgba(139,92,246,.12);font-weight:800;color:var(--ink)}
.tbl tr:last-child td{border-bottom:none}
.tbl td{color:#D9D7F2}

/* in-article CTA */
.cta-card{background:linear-gradient(135deg,rgba(109,40,217,.32),rgba(236,72,153,.18));
  border:1px solid var(--line-2);border-radius:24px;padding:30px 28px;margin:40px 0;text-align:center}
.cta-card h3{font-size:21px;margin:0 0 8px;color:#fff}
.cta-card p{color:var(--ink-2);margin:0 0 18px;font-size:15px}
.appstore-btn{display:inline-flex;align-items:center;gap:11px;background:#fff;color:#06060F!important;
  padding:12px 22px;border-radius:14px;transition:.2s;font-weight:700;box-shadow:0 14px 40px rgba(255,255,255,.12)}
.appstore-btn:hover{transform:translateY(-3px);text-decoration:none}
.appstore-btn svg{width:25px;height:25px;flex:none}
.appstore-btn .t{text-align:left;line-height:1.05}
.appstore-btn .t small{display:block;font-size:10.5px;color:#3a3a52;font-weight:600}
.appstore-btn .t span{font-size:18px;font-weight:800;font-family:'Space Grotesk',sans-serif}

/* FAQ */
.faq{margin:40px 0}
details{border:1px solid var(--line);border-radius:14px;padding:4px 20px;margin:12px 0;background:var(--glass)}
summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;font-size:15.5px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--violet-2);font-size:20px;line-height:1}
details[open] summary::after{content:"–"}
details .body{padding:0 0 16px;color:var(--ink-2);font-size:14.5px;line-height:1.8}

/* related */
.related{margin:46px 0 20px}
.related h2{font-size:20px;margin-bottom:18px}
.rel-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.rel-card{display:block;background:var(--glass);border:1px solid var(--line);border-radius:16px;padding:20px;transition:.2s}
.rel-card:hover{transform:translateY(-3px);border-color:var(--line-2);text-decoration:none}
.rel-card .k{font-size:11.5px;font-weight:800;color:var(--violet-2);letter-spacing:.05em;text-transform:uppercase}
.rel-card .t{display:block;margin-top:8px;font-size:16px;font-weight:800;color:var(--ink);line-height:1.5}
@media(max-width:600px){.rel-grid{grid-template-columns:1fr}}

/* blog index cards */
.hub-hero{padding:40px 0 6px;text-align:center}
.hub-hero h1{font-size:clamp(30px,5vw,46px);font-weight:900;margin:10px 0 14px}
.hub-hero p{color:var(--ink-2);max-width:560px;margin:0 auto;font-size:16px}
.post-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:36px 0 10px}
.post{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--line);
  border-radius:20px;padding:26px;transition:.2s}
.post:hover{transform:translateY(-4px);border-color:var(--line-2);text-decoration:none}
.post .k{font-size:11.5px;font-weight:800;color:var(--violet-2);letter-spacing:.05em;text-transform:uppercase}
.post h2{font-size:20px;font-weight:800;color:var(--ink);margin:12px 0 10px;line-height:1.5}
.post p{color:var(--ink-2);font-size:14px;margin:0;flex:1}
.post .more{margin-top:16px;font-size:13.5px;font-weight:700;color:var(--violet-2)}
@media(max-width:680px){.post-grid{grid-template-columns:1fr}}

/* footer */
footer{border-top:1px solid var(--line);margin-top:60px;padding:34px 0;position:relative;z-index:2}
.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  max-width:var(--maxw-wide);margin:0 auto;padding:0 22px;font-size:13px;color:var(--ink-3)}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink-2)}
.foot-brand img{width:26px;height:26px;border-radius:7px}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a{color:var(--ink-3)}.foot-links a:hover{color:var(--ink-2);text-decoration:none}