/* ─────────────────────────────────────────
   Reset & Base
───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep:      #0F172A;
  --bg-surface:   #1E293B;
  --bg-glass:     rgba(30, 41, 59, 0.6);
  --border:       rgba(56, 189, 248, 0.12);
  --border-hover: rgba(56, 189, 248, 0.35);
  --accent:       #38BDF8;
  --accent-dim:   rgba(56, 189, 248, 0.18);
  --accent-glow:  rgba(56, 189, 248, 0.08);
  --teal:         #2DD4BF;
  --text-primary: #F8FAFC;
  --text-muted:   #94A3B8;
  --text-dim:     #475569;
  --radius:       14px;
  --radius-sm:    8px;
  --transition:   all 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Space Grotesk', sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
}

/* ─────────────────────────────────────────
   Sticky Header
───────────────────────────────────────── */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: radial-gradient(circle at 40% 40%, var(--accent-dim), transparent 70%);
  box-shadow: 0 0 12px rgba(56,189,248,0.3);
  flex-shrink: 0;
}

.sticky-header h1 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.header-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-left: auto;
}

/* ─────────────────────────────────────────
   Main Layout
───────────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
  display: flex;
  flex-direction: column;
  gap: 7rem;
}

/* ─────────────────────────────────────────
   Section
───────────────────────────────────────── */
.lab-section { display: flex; flex-direction: column; gap: 1.75rem; }

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.8;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-top: -0.25rem;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 680px;
  line-height: 1.75;
}

/* ─────────────────────────────────────────
   Glass Card Base
───────────────────────────────────────── */
.interactive-card,
.solutions-card {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

.interactive-card:hover,
.solutions-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 32px rgba(56,189,248,0.04);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.pill {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(56,189,248,0.25);
  border-radius: 999px;
  padding: 2px 10px;
}

/* ─────────────────────────────────────────
   Section 1: Year Slider & Chat
───────────────────────────────────────── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}

.slider-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.year-slider-wrapper {
  flex: 1;
  min-width: 200px;
}

.year-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  padding: 0 1px;
}

.year-ticks span {
  font-size: 0.65rem;
  color: var(--text-dim);
  font-weight: 500;
}

.year-display {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 48px;
  text-align: right;
}

/* Custom Slider */
.custom-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, var(--accent) 0%, var(--accent) 100%);
  border-radius: 999px;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.custom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2.5px solid var(--accent);
  box-shadow: 0 0 10px rgba(56,189,248,0.45);
  cursor: pointer;
  transition: var(--transition);
}

.custom-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 18px rgba(56,189,248,0.7);
  transform: scale(1.15);
}

.custom-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2.5px solid var(--accent);
  box-shadow: 0 0 10px rgba(56,189,248,0.45);
  cursor: pointer;
}

/* Chat Window */
.chat-window {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.chat-message {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
}

.ai-msg { flex-direction: row-reverse; }

.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.user-avatar {
  background: rgba(100, 116, 139, 0.25);
  border: 1px solid rgba(100,116,139,0.4);
  color: var(--text-muted);
}

.ai-avatar {
  background: var(--accent-dim);
  border: 1px solid rgba(56,189,248,0.35);
  color: var(--accent);
}

.bubble {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.9rem;
  line-height: 1.65;
  max-width: calc(100% - 54px);
}

.user-msg .bubble {
  background: rgba(100, 116, 139, 0.15);
  border: 1px solid rgba(100,116,139,0.2);
  color: var(--text-primary);
}

.ai-msg .bubble {
  background: rgba(56,189,248,0.08);
  border: 1px solid rgba(56,189,248,0.18);
  color: var(--text-primary);
  transition: opacity 0.25s ease;
}

/* ─────────────────────────────────────────
   Section 2: Bar Chart
───────────────────────────────────────── */
.statement-label {
  font-size: 1rem;
  font-style: italic;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 2rem;
  opacity: 0.85;
}

.chart-container {
  padding: 0 0.5rem;
  margin-bottom: 1.75rem;
}

.bar-chart {
  display: flex;
  gap: 1.25rem;
  align-items: flex-end;
  height: 220px;
}

.bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  height: 100%;
  justify-content: flex-end;
}

.bar-track {
  width: 100%;
  height: 160px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.bar-fill {
  width: 100%;
  height: 0%;
  background: linear-gradient(to top, var(--accent), var(--teal));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: height 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 -4px 16px rgba(56,189,248,0.2);
}

.bar-val {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  min-height: 1.1em;
}

.bar-lbl {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.35;
}

.chart-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.sample-btn {
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid rgba(100,116,139,0.35);
  background: rgba(100,116,139,0.12);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.sample-btn:hover {
  border-color: var(--text-muted);
  background: rgba(100,116,139,0.22);
}

.sample-btn--ai {
  border-color: rgba(56,189,248,0.35);
  background: var(--accent-dim);
  color: var(--accent);
}

.sample-btn--ai:hover {
  border-color: var(--accent);
  background: rgba(56,189,248,0.25);
  box-shadow: 0 0 16px rgba(56,189,248,0.2);
}

/* ─────────────────────────────────────────
   Section 3: Filter Layout
───────────────────────────────────────── */
.filter-layout {
  display: flex;
  gap: 1.25rem;
  align-items: stretch;
  min-height: 160px;
}

.filter-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.filter-panel-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.filter-text {
  flex: 1;
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.raw-text {
  background: rgba(100,116,139,0.1);
  border: 1px solid rgba(100,116,139,0.2);
}

.ai-output-text {
  background: rgba(56,189,248,0.06);
  border: 1px solid rgba(56,189,248,0.15);
  color: var(--text-primary);
  transition: opacity 0.25s ease;
}

.filter-slider-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0;
  min-width: 64px;
}

.filter-pct {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

.vertical-slider-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vertical-slider {
  -webkit-appearance: slider-vertical;
  writing-mode: vertical-lr;
  direction: rtl;
  width: 4px;
  height: 120px;
  cursor: pointer;
}

/* Firefox vertical slider */
@supports (-moz-appearance: none) {
  .vertical-slider {
    -moz-appearance: none;
    appearance: none;
    width: 120px;
    height: 4px;
    transform: rotate(-90deg);
  }
}

.filter-slider-labels {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.6rem;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.filter-tag {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(45,212,191,0.12);
  border: 1px solid rgba(45,212,191,0.25);
  border-radius: 999px;
  padding: 2px 8px;
  transition: var(--transition);
}

/* ─────────────────────────────────────────
   ML Solutions Module
───────────────────────────────────────── */
.solutions-card {
  border-color: rgba(45,212,191,0.12);
}

.solutions-prompt {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.options-grid {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0;
}

.option-btn {
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid rgba(45,212,191,0.25);
  background: rgba(45,212,191,0.07);
  color: var(--teal);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.option-btn:hover {
  border-color: var(--teal);
  background: rgba(45,212,191,0.14);
  box-shadow: 0 0 12px rgba(45,212,191,0.15);
}

.option-btn.selected {
  background: rgba(45,212,191,0.2);
  border-color: var(--teal);
  color: var(--text-primary);
  box-shadow: 0 0 18px rgba(45,212,191,0.2);
}

.solutions-reveal {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, margin-top 0.3s ease;
}

.solutions-reveal.open {
  max-height: 600px;
  margin-top: 1.5rem;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.rank-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: rgba(15,23,42,0.5);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  animation: fadeSlideIn 0.35s ease forwards;
  opacity: 0;
}

.rank-item:nth-child(1) { animation-delay: 0.05s; }
.rank-item:nth-child(2) { animation-delay: 0.15s; }
.rank-item:nth-child(3) { animation-delay: 0.25s; }

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.rank-badge {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}

.rank-badge.r1 { background: rgba(56,189,248,0.18); color: var(--accent); border: 1px solid rgba(56,189,248,0.35); }
.rank-badge.r2 { background: rgba(45,212,191,0.14); color: var(--teal);   border: 1px solid rgba(45,212,191,0.3); }
.rank-badge.r3 { background: rgba(100,116,139,0.18); color: var(--text-muted); border: 1px solid rgba(100,116,139,0.3); }

.rank-content {}

.rank-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.rank-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.rank-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─────────────────────────────────────────
   Footer
───────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ─────────────────────────────────────────
   Responsive
───────────────────────────────────────── */
@media (max-width: 640px) {
  .section-title { font-size: 1.8rem; }
  .filter-layout { flex-direction: column; }
  .filter-slider-col {
    flex-direction: row;
    min-width: unset;
    width: 100%;
    justify-content: space-between;
  }
  .vertical-slider-wrapper { flex: 1; }
  .vertical-slider {
    -webkit-appearance: none;
    appearance: none;
    writing-mode: unset;
    direction: unset;
    width: 100%;
    height: 4px;
  }
  .filter-slider-labels { flex-direction: row; }
  .header-sub { display: none; }
  .chart-buttons { flex-direction: column; align-items: center; }
}