/* =====================================================
   MedImaging Lab — main.css
   Dark sci-fi / medical-tech design system
   ===================================================== */

:root {
  --bg:        #050a12;
  --surface:   #0c1520;
  --surface2:  #111d2e;
  --accent:    #00e5ff;
  --accent2:   #7c3aed;
  --accent3:   #10b981;
  --text:      #e2eaf4;
  --muted:     #5a7a99;
  --warm:      #fb923c;
  --glow:      0 0 30px rgba(0,229,255,0.3);
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --radius-sm: 0.6rem;
  --font-mono: 'Space Mono', monospace;
  --font-main: 'Syne', sans-serif;
  --transition: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Animated dot-grid background */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

a { color: var(--accent); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .75; }

/* ── Header ──────────────────────────────────────── */
header {
  position: relative; z-index: 10;
  padding: 1.5rem 3rem;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(0,229,255,.1);
  background: rgba(5,10,18,.85);
  backdrop-filter: blur(12px);
}

.logo { font-size: 1.3rem; font-weight: 800; letter-spacing: -.02em; color: var(--accent); text-shadow: var(--glow); }
.logo span { color: var(--text); }

.badge {
  font-family: var(--font-mono); font-size: .7rem;
  background: rgba(0,229,255,.1); border: 1px solid rgba(0,229,255,.3);
  color: var(--accent); padding: .3rem .8rem; border-radius: 999px; letter-spacing: .1em;
}

/* ── Hero ────────────────────────────────────────── */
.hero { position: relative; z-index: 5; text-align: center; padding: 5rem 2rem 3rem; }

.hero-tag {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--accent); letter-spacing: .2em; margin-bottom: 1rem; text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 800;
  line-height: 1.05; letter-spacing: -.03em; margin-bottom: 1.2rem;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero p { max-width: 600px; margin: 0 auto 2.5rem; color: var(--muted); font-size: 1rem; line-height: 1.7; }

/* ── Tabs ────────────────────────────────────────── */
.tabs {
  display: flex; justify-content: center; gap: .5rem; flex-wrap: wrap;
  margin-bottom: 3rem; padding: 0 2rem; position: relative; z-index: 5;
}

.tab {
  background: var(--surface); border: 1px solid rgba(0,229,255,.1);
  color: var(--muted); padding: .6rem 1.4rem; border-radius: 999px; cursor: pointer;
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .05em;
  transition: var(--transition); white-space: nowrap;
}
.tab:hover, .tab.active {
  background: rgba(0,229,255,.1); border-color: var(--accent);
  color: var(--accent); box-shadow: 0 0 15px rgba(0,229,255,.2);
}

/* ── Main Grid ───────────────────────────────────── */
.main {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
  max-width: 1400px; margin: 0 auto; padding: 0 2rem 4rem;
  position: relative; z-index: 5;
}
@media (max-width: 960px) {
  .main { grid-template-columns: 1fr; }
  header { padding: 1rem 1.5rem; }
}

/* ── 3D Viewer ───────────────────────────────────── */
.viewer-panel {
  background: var(--surface); border: 1px solid rgba(0,229,255,.15);
  border-radius: var(--radius-lg); overflow: hidden;
}

.viewer-header {
  padding: 1.2rem 1.5rem; border-bottom: 1px solid rgba(0,229,255,.08);
  display: flex; justify-content: space-between; align-items: center;
}

.viewer-title {
  font-size: .8rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); font-family: var(--font-mono);
}

.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent3); box-shadow: 0 0 8px var(--accent3);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .5; transform: scale(.8); }
}

canvas { width: 100% !important; display: block; cursor: grab; }
canvas:active { cursor: grabbing; }

.viewer-controls {
  padding: 1rem 1.5rem; display: flex; gap: .5rem;
  flex-wrap: wrap; border-top: 1px solid rgba(0,229,255,.08);
}

.ctrl-btn {
  background: rgba(0,229,255,.05); border: 1px solid rgba(0,229,255,.15);
  color: var(--muted); padding: .4rem .9rem; border-radius: var(--radius-sm);
  cursor: pointer; font-family: var(--font-mono); font-size: .7rem; transition: var(--transition);
}
.ctrl-btn:hover  { background: rgba(0,229,255,.12); color: var(--accent); border-color: var(--accent); }
.ctrl-btn.active { background: rgba(0,229,255,.15); color: var(--accent); border-color: var(--accent); }

/* ── Info Panel ──────────────────────────────────── */
.info-panel {
  display: flex; flex-direction: column; gap: 1.2rem;
  overflow-y: auto; max-height: 700px;
}
.info-panel::-webkit-scrollbar       { width: 4px; }
.info-panel::-webkit-scrollbar-track { background: transparent; }
.info-panel::-webkit-scrollbar-thumb { background: var(--accent2); border-radius: 2px; }

.info-card {
  background: var(--surface); border: 1px solid rgba(0,229,255,.1);
  border-radius: var(--radius-md); padding: 1.5rem; transition: border-color .3s;
}
.info-card:hover { border-color: rgba(0,229,255,.3); }

.card-label {
  font-family: var(--font-mono); font-size: .65rem; letter-spacing: .15em;
  color: var(--accent); text-transform: uppercase; margin-bottom: .5rem;
}
.card-title { font-size: 1.3rem; font-weight: 700; margin-bottom: .8rem; }
.card-desc  { color: var(--muted); font-size: .9rem; line-height: 1.7; margin-bottom: 1rem; }

/* Specs */
.specs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.spec       { background: var(--surface2); border-radius: var(--radius-sm); padding: .7rem; }
.spec-key   { font-family: var(--font-mono); font-size: .6rem; color: var(--muted); margin-bottom: .2rem; }
.spec-val   { font-size: .85rem; font-weight: 700; }

/* Pipeline flow */
.flow       { display: flex; flex-direction: column; }
.flow-step  { display: flex; gap: 1rem; position: relative; }
.flow-step:not(:last-child)::after {
  content: ''; position: absolute; left: 14px; top: 32px;
  width: 2px; height: calc(100% - 10px);
  background: linear-gradient(to bottom, var(--accent2), transparent);
}
.flow-num {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  background: rgba(124,58,237,.2); border: 1px solid var(--accent2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: .7rem; color: #a78bfa;
  margin-top: .8rem; position: relative; z-index: 1;
}
.flow-content { padding: .8rem 0 1.2rem; }
.flow-title   { font-size: .85rem; font-weight: 700; margin-bottom: .3rem; }
.flow-desc    { font-size: .78rem; color: var(--muted); line-height: 1.6; }

/* Code block */
.code-section {
  background: var(--surface2); border: 1px solid rgba(124,58,237,.2);
  border-radius: .8rem; overflow: hidden; margin-top: 1rem;
}
.code-header {
  background: rgba(124,58,237,.1); padding: .6rem 1rem;
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid rgba(124,58,237,.15);
}
.code-lang { font-family: var(--font-mono); font-size: .65rem; color: #a78bfa; letter-spacing: .1em; }
.copy-btn  {
  background: none; border: none; cursor: pointer;
  font-family: var(--font-mono); font-size: .65rem; color: var(--muted); transition: color .2s;
}
.copy-btn:hover { color: var(--accent); }

pre {
  padding: 1.2rem; font-family: var(--font-mono); font-size: .72rem;
  line-height: 1.8; overflow-x: auto; color: #c4d7f0;
}

/* Syntax highlighting */
.kw  { color: #7c3aed; }
.fn  { color: #00e5ff; }
.str { color: #10b981; }
.num { color: #fb923c; }
.cm  { color: #3d5a7a; }
.cls { color: #f43f5e; }
.var { color: #e2eaf4; }

/* Code explanation */
.code-explain {
  background: var(--surface2); border: 1px solid rgba(16,185,129,.2);
  border-radius: .8rem; overflow: hidden; margin-top: 1rem;
}
.explain-header {
  background: rgba(16,185,129,.08); padding: .6rem 1rem;
  border-bottom: 1px solid rgba(16,185,129,.15);
  font-family: var(--font-mono); font-size: .65rem; color: #34d399; letter-spacing: .1em;
}
.explain-body   { padding: 1.2rem; }
.explain-item   { display: flex; gap: .8rem; margin-bottom: .9rem; align-items: flex-start; }
.explain-tag    {
  font-family: var(--font-mono); font-size: .62rem; color: var(--accent2);
  background: rgba(124,58,237,.15); border: 1px solid rgba(124,58,237,.25);
  border-radius: 4px; padding: .2rem .5rem; white-space: nowrap; flex-shrink: 0; margin-top: 2px;
}
.explain-text         { font-size: .8rem; color: var(--muted); line-height: 1.65; }
.explain-text strong  { color: var(--text); font-weight: 700; }
.explain-text code    {
  font-family: var(--font-mono); font-size: .7rem; color: var(--accent);
  background: rgba(0,229,255,.06); padding: .1rem .35rem; border-radius: 3px;
}

/* ── Footer ──────────────────────────────────────── */
footer {
  text-align: center; padding: 2rem;
  font-family: var(--font-mono); font-size: .65rem; color: var(--muted);
  border-top: 1px solid rgba(0,229,255,.06); position: relative; z-index: 5;
}
.footer-sep { margin: 0 .5rem; opacity: .4; }