/* ================================================================
   AI Fake Profile Detector — Premium Dark UI  (v2)
   ================================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#0b0d13;
  --surf:#13151d;
  --surf2:#1a1d2a;
  --surf3:#23263a;
  --brd:rgba(255,255,255,.07);
  --brd2:rgba(255,255,255,.12);
  --txt:#e2e5f0;
  --txt2:#858a9e;
  --accent:#6c63ff;
  --accent2:#a78bfa;
  --aglow:rgba(108,99,255,.35);
  --green:#22c55e;
  --gglow:rgba(34,197,94,.25);
  --red:#ef4444;
  --rglow:rgba(239,68,68,.25);
  --orange:#f59e0b;
  --cyan:#06b6d4;
  --cglow:rgba(6,182,212,.25);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --r:14px;
  --rs:10px;
}

html{font-size:16px}
body{font-family:var(--font);background:var(--bg);color:var(--txt);min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}

/* ── Header ──────────────────────────────────────── */
.header{text-align:center;padding:2.5rem 1rem 1rem}
.header__logo{display:flex;align-items:center;justify-content:center;gap:.55rem;margin-bottom:.4rem}
.header__icon{width:30px;height:30px;color:var(--accent);filter:drop-shadow(0 0 8px var(--aglow))}
.header h1{font-size:1.55rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.header__sub{color:var(--txt2);font-size:.88rem;max-width:480px;margin:0 auto;line-height:1.5}

/* ── Container ───────────────────────────────────── */
.container{flex:1;width:100%;max-width:740px;margin:0 auto;padding:0 1.25rem 3rem}

/* ── Tabs ────────────────────────────────────────── */
.tabs{
  display:flex;
  gap:4px;
  margin:1.25rem 0 1.5rem;
  background:var(--surf);
  border:1px solid var(--brd);
  border-radius:var(--rs);
  padding:4px;
}
.tabs__btn{
  flex:1;
  display:flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font);font-size:.88rem;font-weight:600;
  padding:.7rem 1rem;
  border:none;border-radius:8px;
  background:transparent;color:var(--txt2);
  cursor:pointer;
  transition:all .2s ease;
}
.tabs__btn svg{opacity:.5;transition:opacity .2s}
.tabs__btn:hover{color:var(--txt);background:var(--surf2)}
.tabs__btn--active{
  color:#fff !important;
  background:linear-gradient(135deg,var(--accent),var(--accent2)) !important;
  box-shadow:0 2px 12px var(--aglow);
}
.tabs__btn--active svg{opacity:1}

/* ── Panels ──────────────────────────────────────── */
.panel{display:flex;flex-direction:column;gap:1.5rem}
.panel--hidden{display:none !important}

/* ── Card ────────────────────────────────────────── */
.card{
  background:var(--surf);
  border:1px solid var(--brd);
  border-radius:var(--r);
  padding:1.75rem;
  box-shadow:0 4px 20px rgba(0,0,0,.3);
  transition:box-shadow .3s;
}
.card:hover{box-shadow:0 6px 28px rgba(0,0,0,.42)}
.card__heading{font-size:1.1rem;font-weight:700;margin-bottom:1rem;color:var(--txt)}
.card__sub{font-size:.84rem;color:var(--txt2);margin-bottom:1.25rem;line-height:1.55}

/* ── Dropzone ────────────────────────────────────── */
.dropzone{
  border:2px dashed rgba(108,99,255,.3);
  border-radius:var(--rs);
  padding:2.25rem 1rem;
  text-align:center;
  cursor:pointer;
  transition:border-color .2s,background .2s;
}
.dropzone:hover,.dropzone.drag-over{border-color:var(--accent);background:rgba(108,99,255,.06)}
.dropzone__icon{width:44px;height:44px;color:var(--accent);margin-bottom:.65rem;opacity:.65}
.dropzone__label{color:var(--txt2);line-height:1.6;font-size:.9rem}
.dropzone__link{color:var(--accent);font-weight:600;text-decoration:underline;text-underline-offset:3px}

/* ── Preview ─────────────────────────────────────── */
.preview{margin-top:1rem;text-align:center}
.preview img{max-width:200px;max-height:200px;border-radius:var(--rs);border:1px solid var(--brd);object-fit:cover;box-shadow:0 2px 10px rgba(0,0,0,.3)}

/* ── Buttons ─────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-family:var(--font);font-weight:600;font-size:.92rem;
  border:none;border-radius:var(--rs);padding:.7rem 1.5rem;
  cursor:pointer;transition:transform .15s,box-shadow .25s,opacity .2s;
}
.btn:active{transform:scale(.97)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn--accent{margin-top:1.25rem;width:100%;background:linear-gradient(135deg,var(--accent),#8b5cf6);color:#fff;box-shadow:0 4px 16px var(--aglow)}
.btn--accent:hover:not(:disabled){box-shadow:0 6px 24px var(--aglow)}
.btn--cyan{margin-top:1.25rem;width:100%;background:linear-gradient(135deg,var(--cyan),#0ea5e9);color:#fff;box-shadow:0 4px 16px var(--cglow)}
.btn--cyan:hover:not(:disabled){box-shadow:0 6px 24px var(--cglow)}
.btn--ghost{margin-top:.6rem;background:var(--surf2);color:var(--txt2);border:1px solid var(--brd);padding:.5rem 1.2rem;font-size:.82rem}
.btn__spin{display:none;width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}
.btn.loading .btn__label{display:none}
.btn.loading .btn__spin{display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Top-k ───────────────────────────────────────── */
.topk-row{display:flex;align-items:center;gap:.75rem;margin-top:1.25rem}
.topk-row__label{font-size:.84rem;font-weight:600;color:var(--txt2)}
.select{font-family:var(--font);font-size:.84rem;font-weight:600;padding:.4rem .7rem;background:var(--surf2);color:var(--txt);border:1px solid var(--brd);border-radius:8px;cursor:pointer}
.select:focus{outline:none;border-color:var(--accent)}

/* ── Metrics (detection result) ──────────────────── */
.metrics{display:flex;flex-direction:column;gap:1.2rem}
.metric{display:flex;flex-direction:column;gap:.35rem}
.metric__name{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--txt2)}
.metric__val{font-size:.92rem;font-weight:600}

/* Badge */
.badge{display:inline-block;padding:.3rem .9rem;border-radius:999px;font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;width:fit-content}
.badge--real{background:var(--gglow);color:var(--green);box-shadow:0 0 10px var(--gglow)}
.badge--fake{background:var(--rglow);color:var(--red);box-shadow:0 0 10px var(--rglow)}

/* Progress bars */
.bar{height:8px;background:var(--surf2);border-radius:999px;overflow:hidden}
.bar__fill{height:100%;border-radius:999px;width:0;transition:width .8s cubic-bezier(.22,1,.36,1);background:linear-gradient(90deg,var(--accent),var(--accent2));box-shadow:0 0 6px var(--aglow)}
.bar--cyan .bar__fill,.bar__fill--cyan{background:linear-gradient(90deg,var(--cyan),#38bdf8);box-shadow:0 0 6px var(--cglow)}

/* ── History table ───────────────────────────────── */
.table-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:.84rem}
.tbl th{text-align:left;padding:.55rem .45rem;color:var(--txt2);font-weight:600;text-transform:uppercase;letter-spacing:.05em;font-size:.7rem;border-bottom:1px solid var(--brd)}
.tbl td{padding:.5rem .45rem;border-bottom:1px solid var(--brd);color:var(--txt);vertical-align:middle}
.tbl tbody tr{transition:background .15s}
.tbl tbody tr:hover{background:var(--surf2)}
.tbl img{width:34px;height:34px;border-radius:6px;object-fit:cover;border:1px solid var(--brd)}
.tbl__empty{text-align:center;color:var(--txt2);padding:1.5rem!important}

/* ── Stats row (query info) ──────────────────────── */
.stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem}
.stat{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.7rem;background:var(--surf2);border-radius:8px;border:1px solid var(--brd)}
.stat__label{font-size:.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--txt2);text-align:center}
.stat__val{font-size:.95rem;font-weight:700}
.stat__val--ok{color:var(--green)}

/* ── Match grid ──────────────────────────────────── */
.match-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:1rem}

.match-card{
  background:var(--surf2);border:1px solid var(--brd);border-radius:var(--rs);
  overflow:hidden;position:relative;
  transition:transform .2s,box-shadow .2s,border-color .2s;
  animation:slideUp .4s ease both;
}
.match-card:hover{transform:translateY(-4px);box-shadow:0 10px 28px rgba(0,0,0,.4);border-color:var(--brd2)}
.match-card:nth-child(1){animation-delay:0s}
.match-card:nth-child(2){animation-delay:.06s}
.match-card:nth-child(3){animation-delay:.12s}
.match-card:nth-child(4){animation-delay:.18s}
.match-card:nth-child(5){animation-delay:.24s}

.match-card__rank{position:absolute;top:6px;left:6px;width:26px;height:26px;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:800;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);border-radius:50%;border:1px solid var(--brd);color:var(--txt);z-index:1}
.match-card__rank--1{background:rgba(108,99,255,.75);color:#fff}
.match-card__rank--2{background:rgba(6,182,212,.65);color:#fff}
.match-card__rank--3{background:rgba(249,115,22,.6);color:#fff}

.match-card__img{width:100%;aspect-ratio:1;object-fit:cover;display:block;background:var(--surf3)}

.match-card__body{padding:.7rem}
.match-card__sim{display:flex;align-items:center;justify-content:space-between;margin-bottom:.4rem}
.match-card__sim-lbl{font-size:.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--txt2)}
.match-card__sim-val{font-size:.9rem;font-weight:800}
.sim--high{color:var(--green);text-shadow:0 0 6px var(--gglow)}
.sim--mid{color:var(--orange)}
.sim--low{color:var(--red)}

.match-bar{height:3px;background:var(--surf3);border-radius:999px;overflow:hidden;margin-bottom:.45rem}
.match-bar__fill{height:100%;border-radius:999px;transition:width .8s cubic-bezier(.22,1,.36,1)}
.match-bar__fill--high{background:linear-gradient(90deg,var(--green),#4ade80)}
.match-bar__fill--mid{background:linear-gradient(90deg,var(--orange),#facc15)}
.match-bar__fill--low{background:linear-gradient(90deg,var(--red),#f97316)}

.match-card__meta{display:flex;flex-direction:column;gap:.15rem}
.match-card__row{display:flex;justify-content:space-between;font-size:.7rem;color:var(--txt2)}
.match-card__row span:last-child{font-weight:600;color:var(--txt)}

/* ── Error Box ───────────────────────────────────── */
.error-box{
  background:rgba(239,68,68,.1);
  color:#fca5a5;
  border:1px solid rgba(239,68,68,.4);
  padding:.8rem;
  border-radius:8px;
  margin-top:1.25rem;
  font-size:.84rem;
  font-weight:600;
  display:none;
}

/* ── Footer ──────────────────────────────────────── */
.footer{text-align:center;padding:1.5rem;font-size:.76rem;color:var(--txt2)}

/* ── Animations ──────────────────────────────────── */
.fade-in{animation:fadeIn .45s ease forwards}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

/* ── Responsive ──────────────────────────────────── */
@media(max-width:560px){
  .header h1{font-size:1.25rem}
  .card{padding:1.2rem}
  .tabs__btn{font-size:.8rem;padding:.6rem .6rem}
  .stats-row{grid-template-columns:1fr}
  .match-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
}