:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --panel: rgba(19, 24, 31, 0.8);
  --panel-strong: rgba(15, 19, 25, 0.96);
  --border: rgba(255, 255, 255, 0.08);
  --text: #f3f5f7;
  --muted: #98a4b3;
  --accent: #c9ff57;
  --accent-2: #5ef0c5;
  --danger: #ff7d7d;
  --shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(94, 240, 197, 0.12), transparent 30%),
    radial-gradient(circle at top right, rgba(201, 255, 87, 0.1), transparent 25%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, select, textarea {
  font: inherit;
}

body {
  position: relative;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image: radial-gradient(#ffffff 0.8px, transparent 0.8px);
  background-size: 20px 20px;
}

.shell {
  width: min(1280px, calc(100vw - 32px));
  margin: 32px auto 48px;
  position: relative;
  z-index: 1;
}

.glass {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.hero {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 28px;
  padding: 36px;
}

.hero h1,
section h2,
.result h3,
.result h4 {
  margin: 0;
  letter-spacing: -0.03em;
}

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 5rem);
  line-height: 0.95;
  margin-bottom: 14px;
}

.eyebrow,
.label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0 0 10px;
}

.lede {
  max-width: 62ch;
  color: #d7dde5;
  font-size: 1.05rem;
  line-height: 1.6;
}

.hero-actions,
.section-head,
.result-grid,
.tabs,
.history-list {
  display: flex;
  gap: 12px;
}

.hero-actions {
  margin-top: 22px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.stat-card,
.card {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 20px;
}

.stat-card {
  padding: 18px;
}

.stat-card strong {
  display: block;
  font-size: 1.9rem;
  margin-bottom: 6px;
}

.stat-card span,
.subtle {
  color: var(--muted);
}

.grid-two {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(420px, 1.05fr);
  gap: 22px;
  margin-top: 22px;
}

.lower-grid {
  align-items: start;
}

.planner,
.result,
.ask,
.knowledge,
.history {
  padding: 28px;
}

.section-head {
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.planner-form,
.ask-form {
  display: grid;
  gap: 16px;
}

label span {
  display: block;
  margin-bottom: 8px;
  color: #dae1e8;
  font-weight: 600;
}

select,
textarea {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  padding: 14px 16px;
  outline: none;
}

select:focus,
textarea:focus {
  border-color: rgba(201, 255, 87, 0.65);
  box-shadow: 0 0 0 4px rgba(201, 255, 87, 0.08);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 13px 18px;
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease, background 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #9affdf);
  color: #0a0f09;
  font-weight: 800;
}

.btn-secondary,
.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.08);
}

.btn-ghost {
  color: var(--muted);
}

.full {
  width: 100%;
}

.badge {
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.82rem;
  color: var(--muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
}

.live {
  color: #0c1208;
  background: linear-gradient(135deg, #d9ff84, #7fffd0);
}

.result-block {
  margin-bottom: 18px;
}

.result h3 {
  font-size: 2.2rem;
  margin-top: 4px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.inset {
  padding: 18px;
}

.result ul,
.shopping-gaps,
.formula-list,
.tier-groups {
  margin: 0;
  padding-left: 18px;
}

.result li,
.shopping-gaps li,
.formula-card li {
  margin-bottom: 8px;
  color: #dce3ea;
}

.answer {
  min-height: 240px;
  white-space: pre-wrap;
  line-height: 1.6;
}

.answer p,
.answer li,
.answer h2 {
  margin-top: 0;
}

.tabs {
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tab {
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
}

.tab.active {
  color: #08110b;
  background: linear-gradient(135deg, var(--accent), #9affdf);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tier-group,
.formula-card,
.history-item {
  padding: 16px;
  margin-bottom: 12px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--panel-strong);
}

.tier-group h3,
.formula-card h3,
.history-item h3 {
  margin: 0 0 10px;
}

.history-list {
  flex-direction: column;
}

.history-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 8px;
}

.status {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(201,255,87,0.08);
  color: #dff7a1;
  border: 1px solid rgba(201,255,87,0.18);
}

.hidden {
  display: none;
}

.markdown-body h2 {
  margin-top: 16px;
  font-size: 1rem;
}

.markdown-body ul {
  padding-left: 18px;
}

@media (max-width: 980px) {
  .hero,
  .grid-two {
    grid-template-columns: 1fr;
  }

  .result-grid,
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100vw - 20px, 1280px);
    margin: 10px auto 20px;
  }

  .hero,
  .planner,
  .result,
  .ask,
  .knowledge,
  .history {
    padding: 20px;
    border-radius: 20px;
  }

  .hero h1 {
    font-size: 2.3rem;
  }
}