/* QOSE Case Studies hub — stylesheet. Responsive for any screen size and input type. */
:root{--bg:#02040a;--p:rgba(8,14,28,.88);--ln:rgba(120,170,255,.22);--ac:#5cc8ff;--tx:#dfe9ff;--dim:#8da2c4;--green:#34d399}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--tx);font:14px/1.4 system-ui,-apple-system,Segoe UI,sans-serif}
a{color:inherit}

/* ---------- Auth gate (same pattern as Echo / CAD Inspector) ---------- */
#auth-gate{position:fixed;inset:0;z-index:999;display:flex;align-items:center;justify-content:center;background:var(--bg)}
.gate-spinner{width:36px;height:36px;border-radius:50%;border:3px solid rgba(0,194,255,.2);border-top-color:var(--ac);animation:spin .9s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.gate-card{text-align:center;padding:32px;max-width:340px;margin:0 16px;background:var(--p);border:1px solid var(--ln);border-radius:8px}
.gate-mark{font-weight:700;font-size:28px;color:var(--ac);margin-bottom:12px}
.gate-title{font-size:16px;margin-bottom:8px}
.gate-sub{font-size:12px;color:var(--dim);margin-bottom:20px;line-height:1.5}
.gate-btn{display:inline-block;padding:8px 20px;border:1px solid var(--ac);color:var(--ac);text-decoration:none;border-radius:4px;font-size:12px}

#app-root{display:none;min-height:100vh}
.cs-top{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:10px calc(14px + env(safe-area-inset-right)) 10px calc(14px + env(safe-area-inset-left));padding-top:calc(10px + env(safe-area-inset-top));border-bottom:1px solid var(--ln);background:var(--p)}
.cs-brand{display:flex;gap:10px;align-items:center;font-size:16px;letter-spacing:.5px}
.cs-brand img{width:28px;height:28px}
.cs-sp{flex:1}
.cs-btn{display:inline-flex;align-items:center;min-height:38px;padding:4px 12px;border:1px solid var(--ln);border-radius:8px;background:rgba(30,50,90,.55);color:var(--tx);text-decoration:none;font-size:13px}
.cs-btn:hover{border-color:var(--ac);color:var(--ac)}
.cs-wrap{max-width:1100px;margin:0 auto;padding:22px calc(14px + env(safe-area-inset-right)) calc(30px + env(safe-area-inset-bottom)) calc(14px + env(safe-area-inset-left))}
.cs-wrap h2{margin:0 0 6px;font-size:22px;font-weight:600}
.cs-lead{margin:0 0 4px;color:var(--dim);max-width:62ch}
.cs-count{color:var(--dim);font-size:12px;margin:0 0 18px}
#cs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr));gap:14px}
.cs-card{display:flex;flex-direction:column;gap:10px;padding:16px;border:1px solid var(--ln);border-radius:12px;background:var(--p);text-decoration:none;min-height:190px}
a.cs-card:hover,a.cs-card:focus-visible{border-color:var(--ac);outline:none}
.cs-card.soon{opacity:.6}
.cs-card-top{display:flex;justify-content:space-between;align-items:center}
.cs-card-icon img{width:36px;height:36px}
.cs-topic{font-size:10px;letter-spacing:1.5px;color:var(--ac);border:1px solid rgba(92,200,255,.35);border-radius:10px;padding:3px 8px}
.cs-card-name{font-size:19px;font-weight:600}
.cs-card-tag{color:var(--dim);flex:1}
.cs-card-foot{display:flex;justify-content:space-between;align-items:center;font-size:11px;letter-spacing:1px}
.cs-free{color:var(--green);border:1px solid rgba(52,211,153,.35);border-radius:10px;padding:2px 8px}
.cs-status{color:var(--dim)}
.cs-note{margin-top:22px;color:var(--dim);font-size:12px}