/* ═══════════════════════════════════════════════════════════════════════════
   BARRIXA™ Decision Tree Tool — Main Stylesheet
   Antilia Tec Pack | Precision Barrier Recommendation Engine
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --ultra-dark:    #0d0d1a;
  --ultra-accent:  #e94560;
  --prime-dark:    #0f1c3f;
  --prime-accent:  #3d91f4;
  --pro-dark:      #0e2340;
  --pro-accent:    #7c5cbf;
  --smart-dark:    #1a1040;
  --smart-accent:  #8b5cf6;

  --bg:            #07070f;
  --bg-card:       #0e1120;
  --bg-card2:      #131628;
  --border:        rgba(255,255,255,0.08);
  --border-glow:   rgba(255,255,255,0.15);
  --text:          #e8eaf6;
  --text-muted:    #8892b0;
  --text-dim:      #4a5568;
  --gold:          #f6c90e;
  --success:       #10d48e;
  --warning:       #f59e0b;
  --danger:        #ef4444;

  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     20px;
  --radius-xl:     28px;

  --shadow-soft:   0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow:   0 0 40px rgba(233,69,96,0.15);
  --transition:    all 0.25s cubic-bezier(0.4,0,0.2,1);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background: var(--bg-card); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }

.bg-decoration {
  position: fixed; inset:0; pointer-events:none; z-index:0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(233,69,96,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(61,145,244,0.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 30% at 50% 50%, rgba(124,92,191,0.04) 0%, transparent 70%);
}

.site-header {
  position: relative; z-index: 10;
  border-bottom: 1px solid var(--border);
  background: rgba(7,7,15,0.9);
  backdrop-filter: blur(20px);
  padding: 0 clamp(16px, 4vw, 48px);
}
.header-inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 18px 0; flex-wrap: wrap;
}
.brand-logo { display: flex; align-items: center; gap: 14px; text-decoration: none; flex-shrink: 0; }
.brand-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: linear-gradient(135deg, var(--ultra-accent), #b91c3c);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 900; color: #fff; letter-spacing: -1px;
  box-shadow: 0 4px 16px rgba(233,69,96,0.4);
}
.brand-text { line-height: 1.2; }
.brand-name { font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--ultra-accent); }
.brand-sub { font-size: 11px; color: var(--text-muted); letter-spacing: 0.5px; }
.header-meta { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.meta-badge {
  font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
  padding: 4px 10px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.12); color: var(--text-muted);
}
.meta-badge.live { color: var(--success); border-color: rgba(16,212,142,0.3); background: rgba(16,212,142,0.08); }

.hero {
  position: relative; z-index:5;
  padding: clamp(40px,6vw,80px) clamp(16px,4vw,48px) clamp(32px,4vw,56px);
  text-align: center; border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--ultra-accent); margin-bottom: 20px;
  padding: 6px 16px; border-radius: 20px;
  border: 1px solid rgba(233,69,96,0.3); background: rgba(233,69,96,0.08);
}
.hero h1 {
  font-size: clamp(28px, 5vw, 52px); font-weight: 800; line-height: 1.15;
  letter-spacing: -1px; margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 30%, rgba(255,255,255,0.6));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero h1 span {
  background: linear-gradient(90deg, var(--ultra-accent), #f97316);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-desc { max-width: 640px; margin: 0 auto 28px; font-size: 16px; color: var(--text-muted); line-height: 1.7; }
.variant-pills { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.variant-pill {
  font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  padding: 5px 14px; border-radius: 20px; border: 1px solid; cursor: default;
}
.pill-ultra  { color: #e94560; border-color: rgba(233,69,96,0.4);   background: rgba(233,69,96,0.1); }
.pill-prime  { color: #3d91f4; border-color: rgba(61,145,244,0.4);  background: rgba(61,145,244,0.1); }
.pill-pro    { color: #a78bfa; border-color: rgba(167,139,250,0.4); background: rgba(167,139,250,0.1); }
.pill-smart  { color: #34d399; border-color: rgba(52,211,153,0.4);  background: rgba(52,211,153,0.1); }

.main-layout {
  position: relative; z-index:5;
  max-width: 1400px; margin: 0 auto;
  padding: clamp(24px,4vw,48px) clamp(16px,4vw,48px);
  display: grid; grid-template-columns: 380px 1fr;
  gap: 28px; align-items: start;
}

.input-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); overflow: hidden; position: sticky; top: 24px;
}
.panel-header {
  padding: 20px 24px 16px; border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.panel-header h2 { font-size: 15px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 8px; }
.panel-header p { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.panel-body { padding: 24px; }

.form-group { margin-bottom: 22px; }
.form-label {
  display: block; font-size: 12px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 8px;
}
.form-label .required { color: var(--ultra-accent); margin-left: 3px; }

.form-select {
  width: 100%; background: var(--bg-card2); border: 1px solid var(--border);
  border-radius: var(--radius-md); color: var(--text); font-size: 14px; font-family: inherit;
  padding: 12px 38px 12px 14px; cursor: pointer; transition: var(--transition);
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238892b0' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center;
}
.form-select:focus { outline: none; border-color: rgba(233,69,96,0.5); box-shadow: 0 0 0 3px rgba(233,69,96,0.08); }
.form-select option { background: #131628; color: #e8eaf6; }

.shelf-life-display { display: flex; align-items: baseline; gap: 6px; margin-bottom: 12px; }
.shelf-life-number { font-size: 36px; font-weight: 800; color: #fff; line-height: 1; font-variant-numeric: tabular-nums; }
.shelf-life-unit { font-size: 14px; color: var(--text-muted); }
.shelf-life-label { font-size: 11px; color: var(--text-dim); margin-top: 2px; display: flex; align-items: center; gap: 4px; }

.range-slider {
  -webkit-appearance: none; appearance: none; width: 100%; height: 6px;
  border-radius: 3px; background: var(--border); outline: none; cursor: pointer; transition: var(--transition);
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: linear-gradient(135deg, var(--ultra-accent), #b91c3c); cursor: pointer;
  border: 2px solid rgba(255,255,255,0.3); box-shadow: 0 2px 8px rgba(233,69,96,0.5); transition: var(--transition);
}
.range-slider::-webkit-slider-thumb:hover { transform: scale(1.2); box-shadow: 0 4px 16px rgba(233,69,96,0.6); }
.range-slider::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: linear-gradient(135deg, var(--ultra-accent), #b91c3c);
  cursor: pointer; border: 2px solid rgba(255,255,255,0.3);
}
.range-marks { display: flex; justify-content: space-between; font-size: 10px; color: var(--text-dim); margin-top: 6px; padding: 0 2px; }

.zone-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.zone-btn {
  padding: 12px 16px; border-radius: var(--radius-md); border: 1px solid var(--border);
  background: var(--bg-card2); color: var(--text-muted); font-size: 13px; font-weight: 600;
  cursor: pointer; transition: var(--transition); display: flex; align-items: center; gap: 8px; justify-content: center;
}
.zone-btn:hover { border-color: rgba(255,255,255,0.2); color: var(--text); }
.zone-btn.active-coastal { background: rgba(61,145,244,0.12); border-color: rgba(61,145,244,0.5); color: #3d91f4; }
.zone-btn.active-inland { background: rgba(167,139,250,0.12); border-color: rgba(167,139,250,0.5); color: #a78bfa; }

.btn-analyze {
  width: 100%; padding: 14px 24px; border: none; border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--ultra-accent) 0%, #b91c3c 100%);
  color: #fff; font-size: 15px; font-weight: 700; cursor: pointer; transition: var(--transition);
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 4px 20px rgba(233,69,96,0.4); margin-top: 8px;
}
.btn-analyze:hover { transform: translateY(-1px); box-shadow: 0 8px 28px rgba(233,69,96,0.5); }
.btn-analyze:active { transform: translateY(0); }
.btn-analyze:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: 0 4px 12px rgba(233,69,96,0.2); }

.output-area { display: flex; flex-direction: column; gap: 20px; }

.empty-state {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 60px 32px; text-align: center;
}
.empty-icon { font-size: 56px; margin-bottom: 20px; opacity: 0.5; }
.empty-title { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.empty-desc { color: var(--text-muted); max-width: 420px; margin: 0 auto 24px; }
.empty-steps { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; }
.empty-step { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); }
.step-num {
  width: 24px; height: 24px; border-radius: 50%; background: var(--border); color: var(--text-muted);
  font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}

.result-card { border-radius: var(--radius-xl); overflow: hidden; border: 1px solid var(--border); }

.variant-hero { padding: 32px; position: relative; overflow: hidden; }
.variant-hero::before {
  content: ''; position: absolute; inset: 0; opacity: 0.04;
  background: repeating-linear-gradient(45deg, transparent, transparent 20px, #fff 20px, #fff 21px);
}
.vh-ultra  { background: linear-gradient(135deg, #1a0510 0%, #2d0820 60%, #0d0d1a 100%); }
.vh-prime  { background: linear-gradient(135deg, #050e28 0%, #0a1f52 60%, #07070f 100%); }
.vh-pro    { background: linear-gradient(135deg, #120a2e 0%, #1e1050 60%, #0d0d1a 100%); }
.vh-smart  { background: linear-gradient(135deg, #0a0e28 0%, #160d3c 60%, #07070f 100%); }

.vh-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  flex-wrap: wrap; gap: 16px; margin-bottom: 24px; position: relative; z-index:2;
}
.vh-variant-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  padding: 4px 12px; border-radius: 20px; border: 1px solid; margin-bottom: 8px;
}
.vh-name { font-size: clamp(26px,4vw,40px); font-weight: 900; line-height: 1.1; letter-spacing: -1px; color: #fff; }
.vh-tagline { font-size: 15px; color: rgba(255,255,255,0.6); font-weight: 500; }

.vh-specs { display: flex; gap: 16px; flex-wrap: wrap; position: relative; z-index:2; }
.vh-spec {
  background: rgba(0,0,0,0.35); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm); padding: 12px 16px; flex: 1; min-width: 120px;
}
.vh-spec-label { font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: 4px; }
.vh-spec-val { font-size: 20px; font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.vh-spec-sub { font-size: 11px; color: rgba(255,255,255,0.4); margin-top: 2px; }

.vh-meta {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  position: relative; z-index:2; margin-top: 20px; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.vh-meta-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: rgba(255,255,255,0.6); }
.vh-meta-icon { font-size: 14px; }

.accent-ultra { color: var(--ultra-accent); border-color: rgba(233,69,96,0.4); }
.accent-prime { color: var(--prime-accent); border-color: rgba(61,145,244,0.4); }
.accent-pro   { color: #a78bfa; border-color: rgba(167,139,250,0.4); }
.accent-smart { color: #34d399; border-color: rgba(52,211,153,0.4); }

.result-details { background: var(--bg-card); padding: 24px; border-top: 1px solid var(--border); }

.detail-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-bottom: 20px; }
.detail-block {
  background: var(--bg-card2); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 16px 18px;
}
.detail-block-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.detail-block-content { font-size: 13px; line-height: 1.7; color: var(--text-muted); }
.detail-block-content strong { color: var(--text); font-weight: 600; }

.spoilage-rank { list-style: none; padding: 0; }
.spoilage-rank li {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-muted); margin-bottom: 6px;
}
.rank-num {
  width: 20px; height: 20px; border-radius: 50%; background: rgba(255,255,255,0.07);
  font-size: 11px; font-weight: 700; color: var(--text-dim);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.rank-1 .rank-num { background: rgba(239,68,68,0.2); color: var(--danger); }
.rank-2 .rank-num { background: rgba(245,158,11,0.15); color: var(--warning); }
.rank-3 .rank-num { background: rgba(16,212,142,0.1); color: var(--success); }

.packaging-notes {
  background: rgba(61,145,244,0.06); border: 1px solid rgba(61,145,244,0.2);
  border-radius: var(--radius-md); padding: 14px 18px; margin-bottom: 16px;
}
.packaging-notes-title {
  font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: #3d91f4; margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.note-list { list-style: none; padding: 0; }
.note-list li {
  font-size: 13px; color: var(--text-muted); margin-bottom: 5px;
  display: flex; align-items: flex-start; gap: 8px; line-height: 1.5;
}
.note-list li::before { content: '→'; color: #3d91f4; flex-shrink: 0; margin-top: 1px; }

.zone-comparison {
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 16px 18px; margin-bottom: 16px;
}
.zone-comparison-title {
  font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 12px; display: flex; align-items: center; gap: 6px;
}
.zone-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.zone-block {
  background: var(--bg-card2); border-radius: var(--radius-sm);
  padding: 12px 14px; border: 1px solid transparent;
}
.zone-block.active { border-color: rgba(255,255,255,0.15); }
.zone-block-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 6px; display: flex; align-items: center; gap: 6px;
}
.label-coastal { color: #3d91f4; }
.label-inland  { color: #a78bfa; }
.zone-variant-name { font-size: 14px; font-weight: 700; color: #fff; }
.zone-variant-note { font-size: 11px; color: var(--text-muted); margin-top: 3px; }
.zone-note-text { font-size: 12px; color: var(--text-muted); margin-top: 8px; line-height: 1.6; grid-column: 1 / -1; }

.justification-block {
  background: rgba(233,69,96,0.05); border: 1px solid rgba(233,69,96,0.2);
  border-left: 3px solid var(--ultra-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px; margin-bottom: 16px;
}
.justification-block p { font-size: 13px; color: var(--text-muted); line-height: 1.7; }
.justification-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: var(--ultra-accent); margin-bottom: 6px;
}

.max-warning {
  background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.3);
  border-radius: var(--radius-md); padding: 14px 18px; margin-bottom: 16px; display: flex; gap: 12px;
}
.max-warning-icon { font-size: 20px; flex-shrink: 0; padding-top: 2px; }
.max-warning-text { font-size: 13px; color: rgba(245,158,11,0.9); line-height: 1.7; }
.max-warning-text strong { color: var(--warning); }

.sources-block {
  background: rgba(255,255,255,0.02); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 12px 16px;
}
.sources-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.sources-list { display: flex; flex-wrap: wrap; gap: 6px; }
.source-chip {
  font-size: 11px; color: var(--text-dim);
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.07);
  border-radius: 4px; padding: 3px 8px;
}

.disclaimer-card {
  background: rgba(239,68,68,0.05); border: 1px solid rgba(239,68,68,0.25);
  border-radius: var(--radius-lg); padding: 20px 24px; display: flex; gap: 16px;
}
.disclaimer-icon { font-size: 24px; flex-shrink: 0; padding-top: 2px; }
.disclaimer-title {
  font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px;
  color: rgba(239,68,68,0.9); margin-bottom: 8px; display: flex; align-items: center; gap: 8px;
}
.disclaimer-text { font-size: 12px; color: var(--text-muted); line-height: 1.8; }
.disclaimer-text strong { color: rgba(239,68,68,0.8); }

.quick-ref { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-xl); overflow: hidden; }
.section-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: rgba(255,255,255,0.02);
}
.section-header h3 { font-size: 14px; font-weight: 700; color: #fff; }
.section-header p { font-size: 12px; color: var(--text-muted); }

.variant-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.variant-card {
  padding: 20px; border-right: 1px solid var(--border); transition: var(--transition);
}
.variant-card:last-child { border-right: none; }
.variant-card:hover { background: rgba(255,255,255,0.02); }
.vc-badge {
  font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  padding: 3px 8px; border-radius: 10px; border: 1px solid; display: inline-block; margin-bottom: 10px;
}
.vc-name { font-size: 16px; font-weight: 800; color: #fff; margin-bottom: 4px; }
.vc-tagline { font-size: 11px; color: var(--text-muted); margin-bottom: 12px; }
.vc-specs { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.vc-spec-item { font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 4px; background: rgba(255,255,255,0.06); color: var(--text-muted); }
.vc-ideal { font-size: 11px; color: var(--text-dim); line-height: 1.6; }
.vc-ideal span { display: block; margin-bottom: 2px; }
.vc-ideal span::before { content: '• '; color: var(--text-dim); }

.examples-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-xl); overflow: hidden; }
.example-list { padding: 8px 12px 16px; }
.example-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  cursor: pointer; transition: var(--transition); border: 1px solid transparent;
}
.example-item:hover { background: rgba(255,255,255,0.04); border-color: var(--border); }
.example-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.example-text { font-size: 13px; color: var(--text-muted); flex: 1; }
.example-text strong { color: var(--text); font-weight: 600; }
.example-arrow { font-size: 11px; color: var(--text-dim); }

.site-footer { position: relative; z-index:5; border-top: 1px solid var(--border); padding: 24px clamp(16px,4vw,48px); text-align: center; }
.footer-inner { max-width: 1400px; margin: 0 auto; }
.footer-text { font-size: 12px; color: var(--text-dim); line-height: 1.8; }
.footer-text a { color: var(--text-muted); text-decoration: none; }
.footer-text a:hover { color: var(--text); }

.analyzing-overlay { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 32px; color: var(--text-muted); font-size: 14px; }
.spin-dots { display: flex; gap: 4px; }
.spin-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ultra-accent); animation: pulse-dot 1.2s ease-in-out infinite; }
.spin-dot:nth-child(2) { animation-delay: 0.2s; }
.spin-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse-dot {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

@media (max-width: 900px) {
  .main-layout { grid-template-columns: 1fr; }
  .input-panel { position: static; }
  .variant-cards { grid-template-columns: repeat(2, 1fr); }
  .variant-card { border-bottom: 1px solid var(--border); }
  .variant-card:nth-child(odd) { border-right: 1px solid var(--border); }
  .variant-card:nth-child(even) { border-right: none; }
  .variant-card:nth-last-child(-n+2) { border-bottom: none; }
}
@media (max-width: 600px) {
  .variant-cards { grid-template-columns: 1fr; }
  .variant-card { border-right: none !important; }
  .variant-card:last-child { border-bottom: none; }
  .zone-grid { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
  .vh-specs { flex-direction: column; }
  .header-meta { display: none; }
}