:root {
  --bg: #faf8f4;
  --ink: #0f0f12;
  --ink-soft: #45464d;
  --line: #e8e4dc;
  --accent: #ff5a36;
  --accent-soft: #ffe4dc;
  --card: #ffffff;
  --good: #16a34a;
  --bad: #dc2626;
  --warn: #d97706;
  --radius: 18px;
  --max: 1100px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-snap-type: y mandatory; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* topbar */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: rgba(250, 248, 244, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.topbar-left .dot { color: var(--accent); }
.topbar-left .live {
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 500;
}
.topbar-left .live a { color: var(--accent); }
.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.counter-pill {
  font-size: 12.5px;
  color: var(--ink-soft);
  font-weight: 600;
  padding: 6px 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.btn-bar {
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease;
}
.btn-bar:hover { transform: translateY(-1px); }
.btn-submit {
  background: var(--ink);
  color: var(--bg);
}
.btn-clear {
  background: transparent;
  color: var(--bad);
  border-color: var(--bad);
}
.contrast-warning {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  background: #b91c1c;
  color: #fff;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  z-index: 99;
  display: none;
}

/* slide layout */
main {
  padding-top: 56px;
}
.slide {
  min-height: calc(100vh - 56px);
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px 40px;
  border-bottom: 1px solid var(--line);
}
.slide-inner {
  width: 100%;
  max-width: var(--max);
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 48px;
  align-items: start;
}
.slide-content {
  min-width: 0;
}
.slide-feedback {
  position: sticky;
  top: 80px;
}
.slide-num {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.slide h1, .slide h2 {
  font-size: clamp(34px, 4.6vw, 60px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 800;
  margin-bottom: 24px;
}
.slide h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: -0.02em;
  font-weight: 700;
  margin-bottom: 14px;
  margin-top: 30px;
}
.slide p {
  font-size: 17px;
  color: var(--ink-soft);
  margin-bottom: 16px;
  max-width: 680px;
}
.slide p strong { color: var(--ink); }
.slide ul {
  list-style: none;
  margin-bottom: 18px;
}
.slide ul li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
  color: var(--ink);
}
.slide ul li:last-child { border-bottom: none; }
.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-right: 8px;
}

.bad-list li { color: var(--bad); }
.good-list li { color: var(--good); font-weight: 600; }

.dark { background: var(--ink); color: var(--bg); }
.dark h1, .dark h2, .dark h3 { color: var(--bg); }
.dark p { color: rgba(250, 248, 244, 0.78); }
.dark ul li { color: var(--bg); border-bottom-color: rgba(255,255,255,0.12); }
.dark .slide-num { background: var(--accent-soft); color: var(--accent); }

/* hero images */
.hero-img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  margin-bottom: 18px;
}
.img-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 18px 0 24px;
}
.img-grid img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
}

/* product spec rows */
.spec-row {
  display: flex;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.spec-row .k {
  width: 110px;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.spec-row .v { color: var(--ink); }

/* pricing tiers (slide 6) */
.tiers-mini {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin: 18px 0;
}
.tier-mini {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 16px;
}
.tier-mini.featured {
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, #fff 0%, #fff7f4 100%);
}
.tier-mini .tname {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.tier-mini .tprice {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}
.tier-mini .tdesc {
  font-size: 13.5px;
  color: var(--ink-soft);
}

/* split allowed/banned */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 22px 0;
}
.col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  background: var(--card);
}
.col h4 {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 12px;
}
.col.bad h4 { color: var(--bad); }
.col.good h4 { color: var(--good); }
.col ul li {
  padding: 8px 0;
  font-size: 14.5px;
  font-family: 'Inter', sans-serif;
}

/* feedback panel */
.fb-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
}
.fb-card h5 {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 12px;
}
.stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}
.star {
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1.5px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-soft);
  font-family: inherit;
  transition: all 0.15s ease;
}
.star:hover, .star.on {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.tri {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 6px;
  margin-bottom: 16px;
}
.tri button {
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  padding: 9px 6px;
  border-radius: 8px;
  border: 1.5px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.15s ease;
}
.tri button:hover { border-color: var(--ink-soft); }
.tri button.love.on { background: var(--good); color: #fff; border-color: var(--good); }
.tri button.tweak.on { background: var(--warn); color: #fff; border-color: var(--warn); }
.tri button.kill.on { background: var(--bad); color: #fff; border-color: var(--bad); }
.fb-card textarea {
  width: 100%;
  min-height: 120px;
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  resize: vertical;
  outline: none;
}
.fb-card textarea:focus { border-color: var(--accent); }
.ask {
  margin-top: 18px;
  padding: 14px 16px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  font-size: 14.5px;
  color: var(--ink);
  font-weight: 500;
}
.ask strong {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}

/* econ math */
.econ-math {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 18px 0;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  line-height: 1.8;
}
.econ-math .row { display: flex; justify-content: space-between; }
.econ-math .row .k { color: var(--ink-soft); }
.econ-math .row .v { font-weight: 700; }
.econ-math hr { margin: 10px 0; border: none; border-top: 1px solid var(--line); }

/* mobile */
@media (max-width: 880px) {
  .slide-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .slide-feedback { position: static; }
  .img-grid { grid-template-columns: 1fr; }
  .tiers-mini { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  .topbar { padding: 0 14px; }
  .topbar-left .live { display: none; }
  .counter-pill { display: none; }
  .btn-bar { padding: 8px 12px; font-size: 12px; }
  html { scroll-snap-type: none; }
  .slide { min-height: auto; padding: 40px 16px; }
}