/* ============================================================
   MoleculeViewer — style.css  (Insilo Labs Edition)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ══ Variables ══ */
:root {
  --bg-base:       #060b14;
  --bg-surface:    #0d1b2a;
  --bg-card:       #0f2035;
  --bg-card-hover: #152840;
  --accent-cyan:   #00d4ff;
  --accent-dim:    #0099bb;
  --accent-violet: #7b2fff;
  --accent-green:  #00ff9d;
  --accent-warn:   #ffb830;
  --text-primary:  #e2e8f0;
  --text-secondary:#7a9bbf;
  --text-muted:    #3d5a7a;
  --border:        rgba(0,212,255,.1);
  --border-hover:  rgba(0,212,255,.3);
  --border-active: rgba(0,212,255,.6);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-card:   0 8px 32px rgba(0,0,0,.5);
  --shadow-glow:   0 0 40px rgba(0,212,255,.1);
  --shadow-btn:    0 4px 20px rgba(0,212,255,.3);
  --tr: .22s cubic-bezier(.4,0,.2,1);
  /* Mouse position (updated via JS) */
  --hero-mx: 50%;
  --hero-my: 50%;
}

/* ══ Reset ══ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg-base);color:var(--text-primary);
  min-height:100dvh;overflow-x:hidden;line-height:1.6;
}
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:var(--bg-base)}
::-webkit-scrollbar-thumb{background:var(--accent-dim);border-radius:3px}

/* ══ BG Canvas ══ */
#bg-canvas{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.4}

/* ══ App wrapper ══ */
.app-wrapper{position:relative;z-index:1;display:flex;flex-direction:column;min-height:100dvh}

/* ══════════════════════════════════════════════════
   HEADER
══════════════════════════════════════════════════ */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(6,11,20,.88);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  height:68px;padding:0 1.5rem;
  display:flex;align-items:center;gap:1.25rem;
}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;flex-shrink:0}
.logo-icon{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--accent-cyan),var(--accent-violet));
  display:flex;align-items:center;justify-content:center;font-size:17px;
}
.logo-text{font-size:1.1rem;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}
.logo-text span{color:var(--accent-cyan)}

/* Search */
.search-wrapper{flex:1;max-width:540px;position:relative;}

/* Search Backdrop (only visible in focused mode) */
.search-backdrop {
  position:fixed;inset:0;background:rgba(5,9,16,0.65);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  z-index:9999;opacity:0;pointer-events:none;transition:opacity 0.2s ease;
}
.search-wrapper.focused-mode .search-backdrop {
  opacity:1;pointer-events:all;
}

.search-input-wrap{position:relative;display:flex;align-items:center;transition:all var(--tr);z-index:1;}
.search-wrapper.focused-mode .search-input-wrap {
  position:fixed;top:14vh;left:50%;transform:translateX(-50%);
  width:90%;max-width:680px;z-index:10000;
  box-shadow:0 30px 60px rgba(0,0,0,0.5);
}

.search-icon{position:absolute;left:13px;color:var(--text-muted);pointer-events:none;font-size:16px;transition:all var(--tr)}
.search-wrapper.focused-mode .search-icon {
  left:24px;font-size:26px;color:var(--text-primary);
}

#search-input{
  width:100%;background:var(--bg-card);border:1px solid var(--border);
  border-radius:50px;padding:9px 48px 9px 40px;
  font-family:'Inter',sans-serif;font-size:.875rem;
  color:var(--text-primary);outline:none;
  transition:all var(--tr);
}
.search-wrapper.focused-mode #search-input {
  background:rgba(12,20,32,0.95);border:1px solid rgba(0,212,255,0.25);
  border-radius:18px;padding:22px 70px 22px 64px;
  font-size:1.3rem;font-weight:500;color:#fff;
}
.search-wrapper.focused-mode #search-input::placeholder{color:rgba(255,255,255,0.3)}
#search-input:focus{
  border-color:var(--border-active);background:var(--bg-card-hover);
  box-shadow:0 0 0 3px rgba(0,212,255,.1);
}
.pulse-focus {
  animation: searchPulse 1.5s ease-out;
}
@keyframes searchPulse {
  0% { box-shadow: 0 0 0 0 rgba(0,212,255,0.7); border-color: rgba(0,212,255,1); }
  50% { box-shadow: 0 0 0 15px rgba(0,212,255,0); }
  100% { box-shadow: 0 0 0 0 rgba(0,212,255,0); }
}
.search-btn{
  position:absolute;right:5px;
  background:linear-gradient(135deg,var(--accent-cyan),var(--accent-violet));
  border:none;border-radius:50px;width:34px;height:34px;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;color:#fff;font-size:14px;
  transition:all var(--tr);
}
.search-wrapper.focused-mode .search-btn {
  right:14px;width:44px;height:44px;border-radius:12px;font-size:20px;
}
.search-btn:hover{transform:scale(1.1);box-shadow:var(--shadow-btn)}

/* Autocomplete */
#autocomplete-list{
  position:absolute;top:calc(100% + 7px);left:0;right:0;
  background:var(--bg-card);border:1px solid var(--border-hover);
  border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-card);
  z-index:200;display:none;transition:all var(--tr);
}
.search-wrapper.focused-mode #autocomplete-list {
  position:fixed;top:calc(14vh + 74px);left:50%;transform:translateX(-50%);
  width:90%;max-width:680px;z-index:9999;
  background:rgba(12,20,32,0.95);border:1px solid rgba(0,212,255,0.15);
  border-radius:16px;box-shadow:0 20px 40px rgba(0,0,0,0.6);
  backdrop-filter:blur(20px);
}
#autocomplete-list.visible{display:block}

.autocomplete-item{
  padding:9px 14px;cursor:pointer;font-size:.85rem;color:var(--text-secondary);
  border-bottom:1px solid var(--border);transition:all var(--tr);
  display:flex;align-items:center;gap:8px;
}
.search-wrapper.focused-mode .autocomplete-item {
  padding:14px 24px;font-size:1.05rem;border-bottom-color:rgba(255,255,255,0.04);
  gap:12px;
}
.autocomplete-item:last-child{border-bottom:none}
.autocomplete-item:hover{background:var(--bg-card-hover);color:var(--text-primary)}
.search-wrapper.focused-mode .autocomplete-item:hover {
  background:rgba(0,212,255,0.08);color:#fff;
}
.autocomplete-item .mol-name{font-weight:500}
.autocomplete-item .mol-cat{
  margin-left:auto;font-size:.7rem;color:var(--text-muted);
  background:rgba(0,212,255,.07);padding:2px 7px;border-radius:50px;white-space:nowrap;
}
.search-wrapper.focused-mode .autocomplete-item .mol-cat {
  font-size:.75rem;color:var(--accent-cyan);background:rgba(0,212,255,.1);
  padding:4px 10px;
}

/* Header actions */
.header-actions{display:flex;gap:7px;flex-shrink:0}
.btn-icon{
  width:36px;height:36px;background:var(--bg-card);
  border:1px solid var(--border);border-radius:9px;
  display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);cursor:pointer;
  transition:all var(--tr);text-decoration:none;font-size:16px;
}
.btn-icon:hover{border-color:var(--border-hover);color:var(--accent-cyan);background:var(--bg-card-hover)}

/* ══ MAIN ══ */
main{flex:1;display:flex;flex-direction:column}

/* ══════════════════════════════════════════════════
   WELCOME SCREEN — INSILO LABS STYLE
══════════════════════════════════════════════════ */
#welcome-screen{
  flex:1;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  padding:3rem 2rem;text-align:center;gap:2.2rem;
  animation:fadeInUp .6s ease both;
  position:relative;overflow:hidden;isolation:isolate;
}
#welcome-screen.hidden{display:none}

/* Animated grid texture */
#welcome-screen::before{
  content:'';position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(0,212,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 1px);
  background-size:72px 72px;
  animation:gridScroll 18s linear infinite;
  opacity:.7;
}
@keyframes gridScroll{from{background-position:0 0}to{background-position:72px 72px}}

/* Mouse spotlight */
.hero-spotlight{
  position:absolute;inset:0;pointer-events:none;z-index:1;
  background:radial-gradient(
    circle 700px at var(--hero-mx) var(--hero-my),
    rgba(0,200,255,.06) 0%,
    rgba(123,47,255,.04) 40%,
    transparent 65%
  );
  will-change:background;
}

/* Floating CPK atoms */
.float-layer{position:absolute;inset:0;pointer-events:none;z-index:2}
.hero-float-atom{
  position:absolute;width:44px;height:44px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:'JetBrains Mono',monospace;font-size:.7rem;font-weight:700;
  border:1.5px solid;
  will-change:transform;
  transition:transform .2s cubic-bezier(.4,0,.2,1);
  user-select:none;
  animation:heroDrift ease-in-out infinite;
}
@keyframes heroDrift{
  0%,100%{translate:0 0}
  25%{translate:8px -14px}
  50%{translate:-10px 8px}
  75%{translate:12px 5px}
}

/* HERO CONTENT */
.hero-content{
  position:relative;z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:1.5rem;
  max-width:760px;
}

/* Badge */
.hero-badge{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 16px;
  background:rgba(0,212,255,.06);
  border:1px solid rgba(0,212,255,.16);
  border-radius:50px;
  font-size:.7rem;font-weight:600;color:var(--accent-cyan);
  letter-spacing:.07em;text-transform:uppercase;
}

/* MASSIVE HERO TITLE */
.hero-title{
  font-size:clamp(3.4rem,9.5vw,7rem);
  font-weight:900;
  letter-spacing:-.05em;
  line-height:.88;
}

/* Animated gradient text */
.gradient-text{
  background:linear-gradient(135deg,#00d4ff 0%,#7b2fff 38%,#ff00cc 68%,#00d4ff 100%);
  background-size:250% 250%;
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  animation:gradientShift 5s ease-in-out infinite;
  display:block;/* line break each word */
}
@keyframes gradientShift{
  0%,100%{background-position:0% 50%}
  50%{background-position:100% 50%}
}

/* Subtitle */
.hero-subtitle{
  font-size:1.05rem;color:var(--text-secondary);
  max-width:480px;line-height:1.75;
}
.hero-subtitle strong{color:var(--text-primary)}

/* HERO STATS */
.hero-stats{
  display:flex;align-items:center;gap:1.6rem;
  background:rgba(9,17,30,.72);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid rgba(0,212,255,.1);
  border-radius:50px;padding:10px 26px;
  box-shadow:0 0 40px rgba(0,0,0,.3);
}
.hero-stat{display:flex;flex-direction:column;align-items:center;gap:2px}
.stat-n{font-size:1.18rem;font-weight:800;color:var(--accent-cyan);letter-spacing:-.02em;line-height:1}
.stat-l{font-size:.6rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;font-weight:600}
.hero-stat-div{width:1px;height:28px;background:rgba(0,212,255,.15);flex-shrink:0}

/* PRESETS SECTION — glass card */
.presets-section{
  position:relative;z-index:3;
  width:100%;max-width:940px;
  background:rgba(13,27,42,.55);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border:1px solid rgba(0,212,255,.09);
  border-radius:28px;padding:22px;
  box-shadow:0 2px 0 rgba(255,255,255,.03) inset,0 24px 64px rgba(0,0,0,.4);
}

/* Category Tabs */
.category-tabs{
  display:flex;gap:6px;flex-wrap:wrap;justify-content:center;
  margin-bottom:16px;
}
.category-tab{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:7px 18px;
  background:rgba(15,32,53,.8);
  border:1px solid var(--border);
  border-radius:50px;
  font-family:'Inter',sans-serif;font-size:.8rem;font-weight:500;
  color:var(--text-secondary);cursor:pointer;
  transition:all var(--tr);white-space:nowrap;
}
.category-tab:hover{border-color:var(--border-hover);color:var(--text-primary)}
.category-tab.active{
  background:rgba(0,212,255,.1);border-color:var(--border-active);
  color:var(--accent-cyan);font-weight:600;
  box-shadow:0 0 0 1px rgba(0,212,255,.15);
}
.tab-emoji{font-size:16px;line-height:1;margin-top:-2px;}
.tab-title{line-height:1;}

/* Category Panels */
.category-panels{min-height:80px}
.category-panel{display:none;flex-wrap:wrap;gap:8px;justify-content:center;animation:fadeInUp .3s ease both}
.category-panel.active{display:flex}

/* Molecule Chips */
.preset-chip{
  padding:7px 15px;
  background:rgba(13,27,42,.9);border:1px solid var(--border);
  border-radius:50px;font-size:.82rem;font-weight:500;
  color:var(--text-secondary);cursor:pointer;
  transition:all var(--tr);
  display:flex;align-items:center;gap:6px;
}
.preset-chip:hover{
  border-color:var(--border-hover);color:var(--text-primary);
  background:var(--bg-card-hover);transform:translateY(-2px);
  box-shadow:0 6px 18px rgba(0,0,0,.4),0 0 0 1px rgba(0,212,255,.08);
}

/* Search Promo Banner */
.search-promo-banner{
  margin-top:20px;width:100%;padding:14px;
  background:rgba(0,212,255,.05);
  border:1px dashed rgba(0,212,255,.3);
  border-radius:12px;
  color:var(--accent-cyan);font-family:'Inter',sans-serif;font-size:.85rem;font-weight:600;
  display:flex;align-items:center;justify-content:center;gap:8px;
  cursor:pointer;transition:all var(--tr);
}
.search-promo-banner:hover{
  background:rgba(0,212,255,.1);
  border-style:solid;border-color:var(--accent-cyan);
  color:#fff;
}
.search-promo-banner iconify-icon{font-size:18px;}

.chip-emoji{font-size:14px}
.protein-chip{border-color:rgba(123,47,255,.25)}
.protein-chip:hover{border-color:rgba(123,47,255,.6);box-shadow:0 6px 18px rgba(123,47,255,.2)}
.chip-pdb{
  font-family:'JetBrains Mono',monospace;font-size:.62rem;
  background:rgba(123,47,255,.2);color:#a78bfa;
  padding:1px 6px;border-radius:4px;
}

/* Search hint */
.search-hint{
  font-size:.75rem;color:var(--text-muted);
  display:flex;align-items:center;gap:6px;
  position:relative;z-index:3;
}
.search-hint kbd{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:4px;padding:1px 7px;font-family:'JetBrains Mono',monospace;
  font-size:.75rem;color:var(--text-secondary);
}
.search-hint code{color:var(--accent-cyan)}

/* ══════════════════════════════════════════════════
   VIEWER SCREEN
══════════════════════════════════════════════════ */
#viewer-screen{display:none;flex-direction:column;flex:1}
#viewer-screen.visible{display:flex;height:calc(100dvh - 68px);overflow:hidden}

.mol-titlebar{
  display:flex;align-items:center;justify-content:space-between;
  padding:.85rem 1.5rem;border-bottom:1px solid var(--border);
  gap:1rem;
  flex-shrink:0;
  animation:fadeInDown .35s ease both;
  overflow-x:auto;
}
.mol-titlebar::-webkit-scrollbar{display:none}
.mol-name-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.mol-display-name{font-size:1.35rem;font-weight:700;letter-spacing:-.02em}
.mol-iupac{
  font-size:.75rem;color:var(--text-muted);
  font-family:'JetBrains Mono',monospace;
  margin-top:2px;max-width:400px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.mol-type-badge{
  display:inline-flex;align-items:center;gap:5px;
  padding:3px 10px;border-radius:50px;
  font-size:.68rem;font-weight:600;white-space:nowrap;letter-spacing:.03em;
}
.mol-type-badge.small{background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.25);color:var(--accent-cyan)}
.mol-type-badge.protein{background:rgba(123,47,255,.15);border:1px solid rgba(123,47,255,.35);color:#a78bfa}

.mol-actions{display:flex;gap:7px;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 16px;border-radius:50px;
  font-family:'Inter',sans-serif;font-size:.8rem;font-weight:600;
  cursor:pointer;transition:all var(--tr);border:1px solid transparent;
  text-decoration:none;
}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text-secondary)}
.btn-outline:hover{border-color:var(--border-hover);color:var(--text-primary);background:var(--bg-card)}
.btn-primary{background:linear-gradient(135deg,var(--accent-cyan),var(--accent-violet));color:#fff;box-shadow:var(--shadow-btn)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(0,212,255,.4)}

/* Viewer layout */
.viewer-layout{
  display:grid;grid-template-columns:1fr 330px;
  flex:1;min-height:0;
}
#viewer-container{
  position:relative;
  background:radial-gradient(ellipse at 50% 60%,#091524 0%,var(--bg-base) 80%);
  border-right:1px solid var(--border);
  overflow:hidden;
  min-height:0;
}
#mol-viewer{width:100%;height:100%}

/* Toolbar */
.btn-toolbar-toggle {
  position:absolute;top:14px;left:14px;z-index:20;
  background:rgba(6,11,20,.82);border:1px solid var(--border);
  color:var(--text-secondary);border-radius:8px;padding:6px 8px;
  cursor:pointer;backdrop-filter:blur(14px);transition:all var(--tr);
}
.btn-toolbar-toggle:hover { color:var(--text-primary);border-color:var(--border-hover); }

.viewer-toolbar{position:absolute;top:54px;left:14px;z-index:10;display:flex;flex-direction:column;gap:8px;transform-origin:top left;transition:opacity 0.2s, transform 0.2s;}
.viewer-toolbar.hidden { opacity:0;pointer-events:none;transform:scale(0.95); }
.toolbar-group{
  background:rgba(6,11,20,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border);border-radius:var(--radius-md);
  padding:6px;display:flex;flex-direction:column;gap:3px;
}
.toolbar-label{font-size:.58rem;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--text-muted);padding:2px 8px}
.style-btn{
  background:none;border:none;padding:6px 10px;border-radius:7px;
  color:var(--text-secondary);font-family:'Inter',sans-serif;font-size:.77rem;font-weight:500;
  cursor:pointer;transition:all var(--tr);text-align:left;
  display:flex;align-items:center;gap:6px;white-space:nowrap;position:relative;
}
.style-btn:hover{background:rgba(0,212,255,.08);color:var(--text-primary)}
.style-btn.active{background:rgba(0,212,255,.14);color:var(--accent-cyan)}
.style-btn.unavailable{opacity:.35;cursor:not-allowed}
.style-btn.unavailable:hover{background:none;color:var(--text-secondary)}
.style-badge{
  font-size:.58rem;font-weight:600;letter-spacing:.03em;
  background:rgba(123,47,255,.2);color:#a78bfa;
  padding:1px 6px;border-radius:4px;margin-left:auto;
}

/* Fullscreen Button */
.btn-fullscreen{
  position:absolute;top:14px;right:14px;z-index:20;
  width:40px;height:40px;border-radius:10px;
  background:rgba(6,11,20,.6);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.15);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-primary);font-size:22px;cursor:pointer;
  transition:all var(--tr);
}
.btn-fullscreen:hover{background:rgba(0,212,255,.2);border-color:var(--accent-cyan);transform:scale(1.05)}

.style-btn.active .style-badge,
.style-btn:not(.unavailable) .style-badge{display:none}
.style-btn.unavailable .style-badge{display:inline-block}

/* Bottom viewer controls */
.viewer-bottom{position:absolute;bottom:14px;right:14px;display:flex;gap:6px}
.viewer-control-btn{
  width:34px;height:34px;
  background:rgba(6,11,20,.82);backdrop-filter:blur(14px);
  border:1px solid var(--border);border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);cursor:pointer;font-size:15px;
  transition:all var(--tr);
}
.viewer-control-btn:hover{border-color:var(--border-hover);color:var(--accent-cyan)}
.viewer-control-btn.active-btn{border-color:var(--border-active);color:var(--accent-cyan)}

/* Atom tooltip */
.atom-tooltip{
  position:absolute;pointer-events:none;
  background:rgba(9,18,32,.95);border:1px solid var(--border-hover);
  border-radius:8px;padding:5px 12px;
  font-size:.8rem;white-space:nowrap;
  opacity:0;transition:opacity .12s;z-index:20;
  display:flex;align-items:center;gap:7px;
}
.atom-tooltip.visible{opacity:1}
.atom-dot{width:11px;height:11px;border-radius:50%;flex-shrink:0;border:1px solid rgba(255,255,255,.15)}

/* Loading overlay */
#loading-overlay{
  display:none;position:absolute;inset:0;
  background:rgba(6,11,20,.9);backdrop-filter:blur(6px);
  align-items:center;justify-content:center;
  flex-direction:column;gap:16px;z-index:50;
}
#loading-overlay.visible{display:flex}
.mol-spinner{width:54px;height:54px;position:relative}
.mol-spinner::before,.mol-spinner::after{
  content:'';position:absolute;inset:0;
  border-radius:50%;border:2px solid transparent;
  border-top-color:var(--accent-cyan);
  animation:spin .85s linear infinite;
}
.mol-spinner::after{
  inset:8px;border-top-color:var(--accent-violet);
  animation-duration:1.4s;animation-direction:reverse;
}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-text{font-size:.85rem;color:var(--text-secondary)}
.loading-steps{display:flex;flex-direction:column;gap:5px;margin-top:4px}
.loading-step{display:flex;align-items:center;gap:8px;font-size:.75rem;color:var(--text-muted);transition:color .2s}
.loading-step.active{color:var(--accent-cyan)}
.loading-step.done{color:var(--accent-green)}
.step-dot{width:7px;height:7px;border-radius:50%;background:currentColor;flex-shrink:0}

/* ══ INFO PANEL ══ */
.info-panel{
  overflow-y:auto;padding:1.25rem;
  display:flex;flex-direction:column;gap:1rem;
  animation:fadeInRight .4s ease both;
  min-height:0;height:100%;
}
.card-header{
  width:100%;padding:9px 13px;
  font-size:.67rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;
  color:var(--text-muted);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:6px;
}

/* Description card */
.desc-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.desc-text{
  padding:10px 13px;font-size:.82rem;color:var(--text-secondary);line-height:1.75;
  font-style:normal;
}
.desc-text.loading{
  color:var(--text-muted);font-style:italic;
  display:flex;align-items:center;gap:6px;
}

/* 2D image */
.mol-2d-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.mol-2d-img-wrap{background:#fff;width:100%;min-height:140px;display:flex;align-items:center;justify-content:center;padding:10px}
#mol-2d-img{max-width:100%;max-height:150px;object-fit:contain;cursor:zoom-in;transition:transform .18s,opacity .18s}
#mol-2d-img:hover{transform:scale(1.04);opacity:.88}

/* Properties */
.props-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.props-list{padding:4px 0}
.prop-row{display:flex;align-items:center;justify-content:space-between;padding:7px 13px;border-bottom:1px solid rgba(255,255,255,.03);gap:8px}
.prop-row:last-child{border-bottom:none}
.prop-key{font-size:.77rem;color:var(--text-secondary);flex-shrink:0;display:flex;align-items:center;gap:4px}
.prop-value{font-family:'JetBrains Mono',monospace;font-size:.8rem;color:var(--text-primary);font-weight:500;text-align:right;word-break:break-all}
.prop-value.formula{color:var(--accent-cyan);font-size:.88rem}
.prop-badge{display:inline-flex;align-items:center;padding:1px 8px;border-radius:50px;font-size:.67rem;font-weight:700;margin-left:6px;vertical-align:middle}
.prop-badge.good{background:rgba(0,255,157,.1);color:var(--accent-green)}
.prop-badge.warn{background:rgba(255,184,48,.1);color:var(--accent-warn)}
.prop-help{font-size:11px;color:var(--text-muted);vertical-align:middle}
.prop-link{color:var(--accent-cyan);text-decoration:none}
.prop-link:hover{text-decoration:underline}

/* CPK Legend */
.legend-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.legend-header{
  display:flex;align-items:center;gap:6px;padding:9px 13px;
  font-size:.67rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;
  color:var(--text-muted);border-bottom:1px solid var(--border);
}
.legend-toggle{margin-left:auto;background:none;border:none;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;font-size:16px;transition:color var(--tr)}
.legend-toggle:hover{color:var(--text-secondary)}
.legend-body{padding:10px 12px}
.legend-intro{font-size:.7rem;color:var(--text-muted);margin-bottom:10px;line-height:1.5}
.legend-intro strong{color:var(--text-secondary)}
.legend-grid{display:grid;grid-template-columns:1fr 1fr;gap:5px}
.legend-item{display:flex;align-items:center;gap:7px;cursor:default}
.legend-dot{width:26px;height:26px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700;border:1px solid rgba(255,255,255,.15)}
.legend-sym{font-size:.78rem;font-weight:700;color:var(--text-primary);font-family:'JetBrains Mono',monospace}
.legend-name{font-size:.68rem;color:var(--text-muted)}

/* Source card */
.source-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:11px 13px;
  display:flex;align-items:center;gap:9px;
  text-decoration:none;color:var(--text-secondary);font-size:.8rem;transition:all var(--tr);
}
.source-card:hover{border-color:var(--border-hover);color:var(--text-primary);background:var(--bg-card-hover)}
.source-logo{font-size:20px}
.source-name{font-weight:600;color:var(--text-primary);font-size:.82rem}
.source-sub{font-size:.7rem;color:var(--text-muted)}

/* ══ TOASTS ══ */
#toast-container{position:fixed;bottom:20px;right:20px;z-index:1000;display:flex;flex-direction:column;gap:7px;pointer-events:none}
.toast{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:10px 16px;font-size:.82rem;color:var(--text-primary);
  box-shadow:var(--shadow-card);
  display:flex;align-items:center;gap:9px;
  animation:toastIn .28s ease both;max-width:300px;pointer-events:all;
}
.toast.error{border-color:rgba(255,80,80,.4)}.toast.error .toast-icon{color:#ff5050}
.toast.success{border-color:rgba(0,255,157,.3)}.toast.success .toast-icon{color:var(--accent-green)}
.toast.info .toast-icon{color:var(--accent-cyan)}
.toast.fadeout{animation:toastOut .28s ease both}
@keyframes toastIn{from{opacity:0;transform:translateX(18px) scale(.95)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateX(18px) scale(.95)}}

/* ══ Base animations ══ */
@keyframes fadeInUp{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:none}}
@keyframes fadeInDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
@keyframes fadeInRight{from{opacity:0;transform:translateX(18px)}to{opacity:1;transform:none}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* Footer */
footer{text-align:center;padding:.85rem 2rem;font-size:.7rem;color:var(--text-muted);border-top:1px solid var(--border)}
footer a{color:var(--accent-dim);text-decoration:none}
footer a:hover{color:var(--accent-cyan)}

/* ══ Responsive ══ */
@media(max-width:900px){
  .viewer-layout{grid-template-columns:1fr;grid-template-rows:380px auto}
  #viewer-container{border-right:none;border-bottom:1px solid var(--border)}
  .info-panel{max-height:none;overflow-y:visible}
  .hero-title{font-size:clamp(2.8rem,9vw,4.5rem)}
}
@media(max-width:600px){
  header{padding:0 1rem}
  .logo-text{display:none}
  .header-actions{display:none}
  .search-wrapper{flex:1;max-width:none}
  .mol-titlebar{padding:.7rem 1rem}
  .btn-toolbar-toggle{top:8px;left:8px}
  .viewer-toolbar{top:45px;left:8px;transform:scale(0.85);transform-origin:top left}
  .hero-stats{gap:1rem;padding:8px 16px}
  .stat-n{font-size:.95rem}
  .presets-section { padding: 1.5rem 1rem; }
  .mol-card { min-width: 130px; }
}

/* ══════════════════════════════════════════════════
   LIGHTBOX
══════════════════════════════════════════════════ */
.lightbox{
  position:fixed;inset:0;z-index:600;
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity .25s;
}
.lightbox.open{opacity:1;pointer-events:all}
.lightbox-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.92);backdrop-filter:blur(10px);cursor:zoom-out}
.lightbox-content{
  position:relative;z-index:1;background:#fff;border-radius:16px;padding:20px;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  max-width:min(90vw,700px);max-height:90vh;
  box-shadow:0 30px 80px rgba(0,0,0,.8);
  animation:fadeInUp .22s ease both;
}
.lb-close{
  position:absolute;top:10px;right:10px;
  background:rgba(0,0,0,.09);border:none;border-radius:50%;
  width:32px;height:32px;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:18px;color:#333;transition:background .15s;
}
.lb-close:hover{background:rgba(0,0,0,.18)}
#lightbox-img{max-width:100%;max-height:70vh;object-fit:contain;border-radius:4px}
.lightbox-caption{font-family:'JetBrains Mono',monospace;font-size:.82rem;color:#444;text-align:center}
.lightbox-hint{font-size:.68rem;color:#999}

@media(max-width:600px){
  .chat-panel{width:calc(100vw - 20px);margin:10px;height:calc(100vh - 20px)}
}