/* ============================================================
   Index / landing page
   ============================================================ */

.idx-root {
  min-height: 100vh;
  background: var(--surface-base);
  display: flex;
  flex-direction: column;
}

.idx-hero {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 64px 64px 32px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}
.idx-hero-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.idx-hero-logo {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--ut-teal-500) 0%, var(--ut-blue-500) 55%, var(--ut-yellow-500) 100%);
  display: grid;
  place-items: center;
  color: white;
  font: 800 22px/1 var(--font-body);
  letter-spacing: -0.02em;
}
.idx-hero-stamp {
  font: 700 13px/1 var(--font-body);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-body-light);
}
.idx-hero-stamp .v {
  color: var(--ut-blue-700);
}
.idx-hero-author {
  font: 400 14px/1.4 var(--font-body);
  color: var(--fg-body-light);
}

.idx-headline-wrap {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 24px 64px 56px;
}
.idx-headline {
  font: 800 96px/1 var(--font-body);
  letter-spacing: -0.028em;
  color: var(--fg-heading-strong);
  margin: 0 0 28px;
  max-width: 1080px;
}
.idx-headline em {
  font-style: normal;
  background: linear-gradient(120deg, var(--ut-teal-500) 0%, var(--ut-blue-500) 55%, var(--ut-yellow-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.idx-dek {
  font: 400 22px/1.5 var(--font-body);
  color: var(--fg-body);
  max-width: 760px;
  margin: 0;
}

/* ─── Modes summary strip ────────────────────────────────────── */
.idx-modes {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 0 64px 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.idx-mode {
  background: var(--mode-bg);
  border: 1.5px solid var(--mode-line);
  border-radius: var(--radius-xl);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
}
.idx-mode-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font: 700 22px/1.1 var(--font-body);
  letter-spacing: -0.012em;
  color: var(--mode-fg);
}
.idx-mode-bar {
  width: 32px; height: 7px; border-radius: 4px;
  background: var(--mode-mark);
}
.idx-mode-short {
  font: 400 14px/1.4 var(--font-body);
  color: var(--mode-fg);
  opacity: 0.78;
  margin-top: 4px;
}
.idx-mode-stat {
  font: 800 48px/1 var(--font-body);
  letter-spacing: -0.03em;
  color: var(--mode-fg);
  font-variant-numeric: tabular-nums;
}

/* ─── Format cards ───────────────────────────────────────────── */
.idx-formats-section {
  background: var(--ut-neutral-25);
  padding: 64px 0 96px;
  border-top: 1px solid var(--border-divider);
}
.idx-formats-head {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 64px 40px;
}
.idx-formats-eyebrow {
  font: 700 12px/1 var(--font-body);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-body-light);
  margin-bottom: 12px;
}
.idx-formats-title {
  font: 800 48px/1.05 var(--font-body);
  letter-spacing: -0.02em;
  color: var(--fg-heading-strong);
  margin: 0 0 12px;
}
.idx-formats-sub {
  font: 400 18px/1.5 var(--font-body);
  color: var(--fg-body);
  max-width: 720px;
  margin: 0;
}

.idx-format-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 64px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
}
.idx-format {
  background: var(--surface-base);
  border: 1px solid var(--border-divider);
  border-radius: var(--radius-2xl);
  padding: 32px 32px 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: border-color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.idx-format:hover {
  border-color: var(--ut-blue-300);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.idx-format-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.idx-format-tag {
  font: 700 11px/1 var(--font-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-body-light);
}
.idx-format-tag.is-primary {
  background: var(--ut-blue-500);
  color: white;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
}
.idx-format-arrow {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--surface-canvas);
  display: grid;
  place-items: center;
  color: var(--fg-body);
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}
.idx-format:hover .idx-format-arrow {
  background: var(--ut-blue-500);
  color: white;
}

.idx-format-preview {
  height: 220px;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  background: var(--surface-canvas);
}

/* Explorer preview — schematic of 3-col app */
.idx-preview-explorer {
  background:
    linear-gradient(to bottom, var(--ut-blue-25) 0, var(--ut-blue-25) 36px, transparent 36px),
    var(--surface-base);
  border: 1px solid var(--border-divider);
}
.idx-preview-explorer .row { position: absolute; }
.idx-preview-explorer .topdot {
  top: 12px; left: 12px;
  display: flex; gap: 6px;
}
.idx-preview-explorer .topdot span {
  width: 8px; height: 8px; border-radius: 50%;
}
.idx-preview-explorer .chips {
  top: 50px; left: 12px; right: 12px;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px;
}
.idx-preview-explorer .chips span {
  height: 36px;
  border-radius: 8px;
  border: 1.5px solid var(--ut-neutral-100);
}
.idx-preview-explorer .chips .a { background: var(--ut-teal-50); border-color: var(--ut-teal-500); }
.idx-preview-explorer .chips .b { background: var(--ut-blue-35); border-color: var(--ut-blue-500); }
.idx-preview-explorer .chips .c { background: var(--ut-yellow-100); border-color: var(--ut-yellow-500); }
.idx-preview-explorer .cols {
  top: 102px; left: 12px; right: 12px; bottom: 12px;
  display: grid; grid-template-columns: 80px 1fr 1fr; gap: 8px;
}
.idx-preview-explorer .colA, .idx-preview-explorer .colB, .idx-preview-explorer .colC {
  background: var(--surface-canvas);
  border: 1px solid var(--border-divider);
  border-radius: 8px;
  padding: 8px;
  display: flex; flex-direction: column; gap: 6px;
}
.idx-preview-explorer .colA span { height: 18px; border-radius: 4px; background: var(--ut-neutral-50); }
.idx-preview-explorer .colA span:nth-child(1) { background: var(--ut-blue-50); }
.idx-preview-explorer .colB .card {
  border-left: 3px solid;
  background: var(--surface-base);
  border-radius: 4px;
  height: 24px;
  display: flex; align-items: center; padding: 0 8px;
}
.idx-preview-explorer .colB .card.t { border-left-color: var(--ut-teal-500); }
.idx-preview-explorer .colB .card.b { border-left-color: var(--ut-blue-500); }
.idx-preview-explorer .colB .card.y { border-left-color: var(--ut-yellow-500); }
.idx-preview-explorer .colB .card::before {
  content: '';
  width: 100%;
  height: 4px;
  background: var(--ut-neutral-50);
  border-radius: 2px;
}
.idx-preview-explorer .colC {
  background: var(--surface-base);
}
.idx-preview-explorer .colC span {
  background: var(--ut-neutral-50);
  border-radius: 4px;
  height: 8px;
}
.idx-preview-explorer .colC span:first-child {
  height: 18px;
  background: var(--ut-blue-200);
  margin-bottom: 4px;
}

/* Subway preview */
.idx-preview-subway {
  background: var(--surface-base);
  display: grid;
  place-items: center;
  border: 1px solid var(--border-divider);
}

/* Deck preview */
.idx-preview-deck {
  background: var(--ut-neutral-25);
  display: grid;
  place-items: center;
  position: relative;
  border: 1px solid var(--border-divider);
}
.idx-preview-deck .deckpile {
  position: relative;
  width: 78%;
  height: 70%;
}
.idx-preview-deck .deckpile .slide {
  position: absolute;
  inset: 0;
  background: var(--surface-base);
  border: 1px solid var(--border-divider);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.idx-preview-deck .deckpile .slide:nth-child(1) { transform: translate(-12px, -10px) rotate(-3deg); }
.idx-preview-deck .deckpile .slide:nth-child(2) { transform: translate(0px, 0px) rotate(0deg); z-index: 2; }
.idx-preview-deck .deckpile .slide:nth-child(3) { transform: translate(14px, 10px) rotate(3deg); }
.idx-preview-deck .deckpile .slide-content {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
}
.idx-preview-deck .deckpile .slide-content .tag {
  width: 60px; height: 7px; background: var(--ut-neutral-100); border-radius: 4px;
}
.idx-preview-deck .deckpile .slide-content .title {
  width: 80%; height: 18px;
  background: linear-gradient(120deg, var(--ut-teal-500), var(--ut-blue-500), var(--ut-yellow-500));
  border-radius: 4px;
}
.idx-preview-deck .deckpile .slide-content .body {
  width: 70%; height: 6px; background: var(--ut-neutral-50); border-radius: 4px;
}
.idx-preview-deck .deckpile .slide-content .pills {
  margin-top: auto;
  display: flex; gap: 6px;
}
.idx-preview-deck .deckpile .slide-content .pills span {
  width: 24px; height: 12px; border-radius: 20px;
}
.idx-preview-deck .deckpile .slide-content .pills span:nth-child(1) { background: var(--ut-teal-200); }
.idx-preview-deck .deckpile .slide-content .pills span:nth-child(2) { background: var(--ut-blue-150); }
.idx-preview-deck .deckpile .slide-content .pills span:nth-child(3) { background: var(--ut-yellow-200); }

.idx-format-title {
  font: 800 28px/1.1 var(--font-body);
  letter-spacing: -0.018em;
  color: var(--fg-heading-strong);
  margin: 0;
}
.idx-format-blurb {
  font: 400 15px/1.5 var(--font-body);
  color: var(--fg-body);
  margin: 0;
}
.idx-format-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-divider);
  font: 600 12px/1.4 var(--font-body);
  color: var(--fg-body-light);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ─── Footer ─────────────────────────────────────────────────── */
.idx-foot {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 32px 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font: 400 13px/1.4 var(--font-body);
  color: var(--fg-body-light);
}
.idx-foot strong { color: var(--fg-body); font-weight: 700; }

/* ─── Comparison callout ─────────────────────────────────────── */
.idx-compare {
  max-width: 1280px;
  margin: 0 auto 0;
  padding: 32px 64px 64px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: center;
}
.idx-compare-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ut-blue-25);
  border: 1.5px solid var(--ut-blue-300);
  color: var(--ut-blue-800);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font: 700 13px/1 var(--font-body);
  letter-spacing: 0.04em;
}
.idx-compare-tag .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ut-blue-500);
}
.idx-compare-text {
  font: 400 16px/1.55 var(--font-body);
  color: var(--fg-body);
}
.idx-compare-text strong { color: var(--fg-body-strong); font-weight: 700; }