/* Core theme */
:root{
  --fg:#e9e9f5; --muted:#b9b9d2; --accent:#b388ff; --accent2:#ff8bd1; --bg:#0b0b16;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;color:var(--fg);background:var(--bg);overflow-x:hidden}
.bg{position:fixed;inset:0;background:url('assets/background.jpg') center/cover no-repeat;filter:saturate(110%) brightness(.9);z-index:-2}
.overlay{position:fixed;inset:0;background:
  radial-gradient(1200px 800px at 70% 10%, rgba(179,136,255,.25), transparent 60%),
  radial-gradient(1200px 800px at 20% 90%, rgba(255,139,209,.22), transparent 60%),
  rgba(5,5,18,.55);z-index:-1}
.site-header{position:sticky;top:0;backdrop-filter:blur(8px);background:rgba(10,10,20,.38);display:flex;justify-content:space-between;align-items:center;padding:14px 28px;border-bottom:1px solid rgba(255,255,255,.06);z-index:5}
.brand{display:flex;align-items:center;gap:12px}
.logo{height:38px;width:auto;filter:drop-shadow(0 0 6px rgba(179,136,255,.3))}
.wordmark{font-weight:800;letter-spacing:.5px}
nav a{color:var(--fg);text-decoration:none;margin-left:18px;font-weight:600;opacity:.9}
nav a:hover{opacity:1;text-shadow:0 0 10px rgba(255,255,255,.25)}
.hero{min-height:72vh;display:grid;place-items:center;text-align:center;padding:10vh 20px 0}
h1{font-size:clamp(44px,8vw,96px);margin:0}
.grad{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 6px 40px rgba(179,136,255,.25)}
.tag{font-size:clamp(16px,2.6vw,22px);color:var(--muted);margin-top:8px}
.cta-row{display:flex;gap:12px;margin-top:22px;justify-content:center;flex-wrap:wrap}
.btn{border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);color:var(--fg);padding:12px 20px;border-radius:999px;text-decoration:none;font-weight:700;transition:transform .15s ease,background .2s ease}
.btn:hover{transform:translateY(-2px);background:rgba(255,255,255,.12)}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent2));border-color:transparent}
.btn.primary:hover{background:linear-gradient(90deg,var(--accent2),var(--accent))}
.panel{padding:56px 20px;max-width:1100px;margin:0 auto}
.panel h2{font-size:clamp(28px,4vw,40px);margin:0 0 8px}
.muted{color:var(--muted);margin-bottom:18px}
.card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:20px;box-shadow:0 10px 40px rgba(0,0,0,.24)}
.card input[type=file]{width:100%;padding:16px;border-radius:12px;background:#111325;border:1px dashed rgba(255,255,255,.2);color:#fff}
.row{margin:14px 0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:16px}
.tile{display:block;padding:18px 18px;border-radius:18px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);text-decoration:none;color:var(--fg);box-shadow:0 10px 30px rgba(0,0,0,.18);transition:transform .15s ease, box-shadow .2s ease, background .2s}
.tile:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,0,0,.28);background:rgba(255,255,255,.1)}
.tile-head{font-weight:800;font-size:18px}
.tile-sub{color:var(--muted);margin-top:6px}
.bullets{line-height:1.7}
.last{padding-bottom:120px}
.site-footer{text-align:center;padding:20px;border-top:1px solid rgba(255,255,255,.06);background:rgba(10,10,20,.38);backdrop-filter:blur(8px)}
.progress{height:14px;background:#111325;border-radius:999px;overflow:hidden;border:1px solid rgba(255,255,255,.12)}
.progress>div{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .8s ease}
.result-badge{display:inline-block;padding:8px 12px;border-radius:999px;font-weight:800;margin-top:10px}
.result-real{background:rgba(99,255,180,.18);border:1px solid rgba(99,255,180,.5)}
.result-ai{background:rgba(255,99,132,.18);border:1px solid rgba(255,99,132,.5)}
.result-uncertain{background:rgba(255,206,86,.18);border:1px solid rgba(255,206,86,.5)}
/* tiny sparkle used by scripts.js */
.spark{position:fixed;width:4px;height:4px;border-radius:50%;background:rgba(255,255,255,.5);box-shadow:0 0 10px rgba(255,255,255,.7);pointer-events:none;transform:translate(-50%,-50%)}