:root {
  --bg: #0f1222;
  --bg-2: #161a30;
  --card: #1b2039;
  --card-2: #222850;
  --line: #2c335c;
  --text: #eef1ff;
  --muted: #9aa3cf;
  --primary: #6c8cff;
  --primary-2: #8a6cff;
  --good: #3ad29f;
  --warn: #ffb454;
  --bad: #ff6b81;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, #20264a 0%, var(--bg) 55%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
.hidden { display: none !important; }
.view { display: none; animation: fade .25s ease; }
.view.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

.muted { color: var(--muted); }
h1,h2,h3,h4 { margin: 0 0 .4rem; font-weight: 700; letter-spacing: -.01em; }
p { line-height: 1.5; }

/* ---------- buttons ---------- */
.btn {
  border: none; border-radius: var(--radius-sm); padding: .85rem 1.2rem;
  font: inherit; font-weight: 600; cursor: pointer; transition: .15s;
}
.btn.primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.primary:disabled { opacity: .45; cursor: not-allowed; filter: none; }
.btn.ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.btn.ghost:hover { color: var(--text); border-color: var(--primary); }
.btn.block { display: block; width: 100%; margin-top: 1rem; }
.link-btn { background: none; border: none; color: var(--muted); cursor: pointer; font: inherit; padding: .3rem .5rem; }
.link-btn:hover { color: var(--text); }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.25rem; box-shadow: var(--shadow);
  margin-bottom: 1rem;
}
input, select {
  width: 100%; padding: .8rem .9rem; margin: .35rem 0 .2rem;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm);
  color: var(--text); font: inherit;
}
input:focus, select:focus { outline: none; border-color: var(--primary); }
label { font-size: .85rem; color: var(--muted); font-weight: 500; }
.form-msg { min-height: 1.1rem; font-size: .9rem; margin: .5rem 0 0; }
.form-msg.error { color: var(--bad); }
.form-msg.ok { color: var(--good); }

/* ---------- login ---------- */
.login-wrap { max-width: 440px; margin: 0 auto; padding: 14vh 1.1rem 2rem; }
.brand { display: flex; align-items: center; gap: .6rem; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center; font-size: 1.5rem;
  border-radius: 14px; background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
}
.brand-mark.sm { width: 30px; height: 30px; font-size: 1rem; border-radius: 9px; }
.brand h1 { font-size: 1.7rem; font-weight: 800; }
.tagline { color: var(--muted); margin: .8rem 0 1.4rem; }
.login-card h2 { font-size: 1.2rem; }

/* ---------- topbar / shell ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center;
  justify-content: space-between; gap: .5rem; padding: .8rem 1rem;
  background: rgba(15,18,34,.85); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; }
.topbar-nav { display: flex; align-items: center; gap: .2rem; flex-wrap: wrap; }
.who { font-size: .8rem; color: var(--muted); margin: 0 .3rem; }
.container { max-width: 880px; margin: 0 auto; padding: 1.1rem; }
.foot { text-align: center; font-size: .8rem; padding: 1.5rem 1rem 3rem; }
.section-title { margin: 1.2rem 0 .7rem; font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }

/* ---------- tool cards ---------- */
.tool-grid { display: grid; gap: .8rem; grid-template-columns: 1fr; }
.tool-card {
  text-align: left; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem; cursor: pointer; transition: .18s;
  color: var(--text); position: relative;
}
.tool-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.tool-card.selected { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary) inset; }
.tool-ic { font-size: 1.7rem; }
.tool-card h4 { margin: .5rem 0 .3rem; font-size: 1.05rem; }
.tool-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.badge {
  display: inline-block; margin-top: .7rem; font-size: .72rem; padding: .25rem .55rem;
  border-radius: 999px; background: var(--card-2); color: var(--muted);
}
.badge.recommended { background: rgba(58,210,159,.15); color: var(--good); }

/* ---------- upload ---------- */
.upload-card { margin-top: 1rem; }
.upload-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; flex-wrap: wrap; }
.pill { font-size: .8rem; color: var(--muted); background: var(--bg-2); padding: .3rem .7rem; border-radius: 999px; }
.dropzone {
  margin: 1rem 0; border: 2px dashed var(--line); border-radius: var(--radius);
  padding: 2rem 1rem; text-align: center; cursor: pointer; transition: .18s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: rgba(108,140,255,.06); }
.dz-ic { font-size: 2rem; }
.dz-title { font-weight: 600; margin: .5rem 0 .2rem; }
.dz-sub { font-size: .85rem; margin: 0; }
.file-chosen {
  display: flex; align-items: center; gap: .6rem; flex-wrap: wrap;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .7rem .9rem;
}
.file-chosen span:first-child { font-weight: 600; }

.advanced { margin-top: .6rem; border-top: 1px solid var(--line); padding-top: .6rem; }
.advanced summary { cursor: pointer; color: var(--muted); font-size: .9rem; }
.opt-grid { display: grid; gap: .7rem; grid-template-columns: 1fr; margin-top: .8rem; }
.opt-group label { display: block; margin-bottom: .1rem; }

/* ---------- progress ---------- */
.progress { height: 12px; background: var(--bg-2); border-radius: 999px; overflow: hidden; margin: 1rem 0 .6rem; }
.progress-bar { height: 100%; width: 0%; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--primary-2)); transition: width .4s ease; }
.proc-step { font-weight: 600; margin: .3rem 0 1rem; }
.step-list { list-style: none; padding: 0; margin: 0 0 1rem; }
.step-list li { padding: .45rem .2rem; color: var(--muted); display: flex; align-items: center; gap: .5rem; font-size: .92rem; }
.step-list li::before { content: "○"; }
.step-list li.done { color: var(--good); }
.step-list li.done::before { content: "✓"; }
.step-list li.active { color: var(--text); font-weight: 600; }
.step-list li.active::before { content: "◉"; color: var(--primary); }

/* ---------- results ---------- */
.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin: .8rem 0; }
.stat { background: var(--bg-2); border-radius: var(--radius-sm); padding: .7rem .8rem; }
.stat .k { font-size: .75rem; color: var(--muted); }
.stat .v { font-size: 1.05rem; font-weight: 700; }
.stat .v .arrow { color: var(--muted); font-weight: 400; }
.status-banner { border-radius: var(--radius-sm); padding: .9rem 1rem; margin: .6rem 0; font-weight: 500; }
.status-banner.good { background: rgba(58,210,159,.13); color: #b9f4dd; border: 1px solid rgba(58,210,159,.3); }
.status-banner.warn { background: rgba(255,180,84,.12); color: #ffdcab; border: 1px solid rgba(255,180,84,.3); }
.status-banner.bad { background: rgba(255,107,129,.12); color: #ffc2cc; border: 1px solid rgba(255,107,129,.3); }
.tag { display: inline-block; font-size: .72rem; padding: .15rem .5rem; border-radius: 999px; background: var(--card-2); margin-left: .3rem; }
.tag.yes { background: rgba(58,210,159,.18); color: var(--good); }
.tag.no { background: rgba(255,107,129,.18); color: var(--bad); }

.download-row { display: flex; align-items: center; justify-content: space-between; gap: .6rem; padding: .6rem 0; border-bottom: 1px solid var(--line); }
.download-row:last-child { border-bottom: none; }
.dl-info { display: flex; flex-direction: column; }
.dl-info .nm { font-weight: 600; word-break: break-all; }
.dl-info .sz { font-size: .78rem; color: var(--muted); }
.btn.sm { padding: .5rem .85rem; font-size: .85rem; }

details.tech summary { cursor: pointer; color: var(--muted); margin-top: .5rem; }
.tech-table { width: 100%; border-collapse: collapse; margin-top: .6rem; font-size: .88rem; }
.tech-table td { padding: .4rem .2rem; border-bottom: 1px solid var(--line); }
.tech-table td:last-child { text-align: right; font-weight: 600; }

.seg-item { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .8rem; margin-bottom: .5rem; }
.seg-head { display: flex; align-items: center; gap: .5rem; justify-content: space-between; }
.seg-dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.seg-meta { font-size: .8rem; color: var(--muted); margin-top: .3rem; display: flex; flex-wrap: wrap; gap: .3rem .9rem; }

/* ---------- viewer ---------- */
.viewer-wrap { margin: .8rem 0; }
#viewer { width: 100%; height: 320px; background: #0b0e1d; border-radius: var(--radius); border: 1px solid var(--line); touch-action: none; }
.viewer-controls { display: flex; gap: .4rem; flex-wrap: wrap; margin-top: .5rem; }
.viewer-controls .chip { font-size: .8rem; padding: .35rem .7rem; border-radius: 999px; border: 1px solid var(--line); background: var(--bg-2); cursor: pointer; color: var(--text); display: flex; align-items: center; gap: .4rem; }
.viewer-controls .chip.off { opacity: .4; }

/* ---------- admin log ---------- */
.admin-log { display: flex; flex-direction: column; gap: .5rem; }
.log-row { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .7rem .8rem; font-size: .85rem; }
.log-row .lr-top { display: flex; justify-content: space-between; gap: .5rem; flex-wrap: wrap; }
.log-row .st { font-weight: 700; }
.log-row .st.done { color: var(--good); } .log-row .st.error { color: var(--bad); } .log-row .st.timeout { color: var(--warn); }

/* ---------- desktop ---------- */
@media (min-width: 720px) {
  .tool-grid { grid-template-columns: repeat(3, 1fr); }
  .opt-grid { grid-template-columns: 1fr 1fr; }
  #viewer { height: 420px; }
}