/* ==========================================================================
   The Battle for Better Air — V1 stylesheet
   Mobile-first. One file. No build step.
   ========================================================================== */

:root {
  --bg:            #0a0e1a;
  --bg-soft:       #0f172a;
  --surface-1:     #1e293b;
  --surface-grad:  linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
  --accent:        #7dd3fc;
  --accent-2:      #a78bfa;
  --text:          #fafafa;
  --text-muted:    #94a3b8;
  --text-dim:      #cbd5e1;
  --border:        rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --glow-cyan:        0 0 40px rgba(125, 211, 252, 0.30);
  --glow-cyan-soft:   0 0 30px rgba(125, 211, 252, 0.15);
  --glow-cyan-text:   0 0 30px rgba(125, 211, 252, 0.25);
  --glow-violet-soft: 0 0 24px rgba(167, 139, 250, 0.18);
  --inner-highlight:  inset 0 1px 0 rgba(255, 255, 255, 0.06);

  --font-serif: 'Fraunces', ui-serif, Georgia, 'Times New Roman', serif;
  --font-sans:  'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Consolas, 'Liberation Mono', monospace;

  --t-fast: 150ms ease;
  --t-base: 250ms ease;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --container-w: 1200px;
  --prose-w:     720px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'kern' 1, 'liga' 1;
  overflow-x: hidden;
}
img, video, svg { display: block; max-width: 100%; height: auto; }
hr { border: 0; }
button, input, select, textarea { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
  color: var(--text);
}
h1 { font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; transition: color var(--t-base); }
a:hover { color: var(--text); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
::selection { background: var(--accent); color: var(--bg); }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}
.prose {
  width: 100%;
  max-width: var(--prose-w);
  margin: 0 auto;
  padding-inline: clamp(1.25rem, 4vw, 2rem);
}
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75em;
}
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.55em 1.1em;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top var(--t-fast);
  text-decoration: none;
}
.skip-link:focus { top: 0.75rem; color: var(--bg); }

/* Buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.95em 1.6em;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.005em;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text);
  transition: transform var(--t-base), box-shadow var(--t-base), background var(--t-base), border-color var(--t-base), color var(--t-base);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: linear-gradient(180deg, rgba(125,211,252,0.95), rgba(125,211,252,0.85));
  color: #07111c;
  border-color: rgba(125,211,252,0.6);
  box-shadow: var(--glow-cyan), var(--inner-highlight);
}
.btn--primary:hover {
  box-shadow: 0 0 60px rgba(125, 211, 252, 0.45), var(--inner-highlight);
  color: #07111c;
}

.btn--secondary {
  background: rgba(255,255,255,0.02);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--secondary:hover {
  background: rgba(125,211,252,0.08);
  border-color: rgba(125,211,252,0.5);
  box-shadow: var(--glow-cyan-soft);
  color: var(--text);
}

/* Nav ------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(10, 14, 26, 0.4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background var(--t-base), border-color var(--t-base);
}
.nav.is-scrolled {
  background: rgba(10, 14, 26, 0.85);
  border-bottom-color: var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 64px;
}
.nav__brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.005em;
  color: var(--text);
}
.nav__brand:hover { color: var(--accent); }
.nav__links {
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  font-size: 0.9375rem;
  font-weight: 500;
}
.nav__links a {
  color: var(--text-muted);
  padding: 0.25em 0;
}
.nav__links a:hover { color: var(--text); }
@media (max-width: 480px) {
  .nav__brand { font-size: 0.95rem; }
  .nav__links a:nth-child(3) { display: none; }
}

/* Hero ------------------------------------------------------------------ */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: radial-gradient(ellipse at 50% 20%, #1e293b 0%, var(--bg) 70%);
  overflow: hidden;
  padding: 96px 0 80px;
}
.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.7;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,14,26,0.4) 0%, rgba(10,14,26,0.85) 100%);
  z-index: 1;
}
.hero__content {
  position: relative;
  z-index: 2;
}
.hero__headline {
  margin: 0 0 0.6em;
  font-size: clamp(2.5rem, 7vw, 6rem);
  text-shadow: var(--glow-cyan-text);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
.hero__headline-1 { display: block; }
.hero__headline-2 {
  display: block;
  font-size: 0.55em;
  font-weight: 500;
  color: var(--text-dim);
  margin-top: 0.35em;
  letter-spacing: -0.01em;
}
.hero__headline-2 em { font-style: italic; color: var(--accent); }
.hero__sub {
  max-width: 36em;
  margin: 0 auto 2em;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: var(--text-dim);
  line-height: 1.55;
}
.hero__scroll {
  position: absolute;
  bottom: 24px; left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  color: var(--text-muted);
  padding: 12px;
  border-radius: 50%;
  animation: bob 2.4s ease-in-out infinite;
}
.hero__scroll:hover { color: var(--accent); }
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.6; }
  50%      { transform: translate(-50%, 8px); opacity: 1; }
}

/* Thesis ---------------------------------------------------------------- */
.thesis {
  padding: clamp(3rem, 6vw, 4rem) 0 1.5rem;
}
.thesis__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 900px) {
  .thesis__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
    max-width: 1120px;
    gap: clamp(2.5rem, 4vw, 4rem);
  }
}
.thesis__content {
  max-width: 38em;
  margin: 0 auto;
}
.thesis__eyebrow {
  margin-bottom: 1.25rem;
}
.thesis__lede {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.05rem, 1.5vw, 1.15rem);
  line-height: 1.6;
  color: var(--text-dim);
  margin: 0 0 1.25rem;
}
.thesis__lede strong {
  font-weight: 600;
  color: var(--text);
}
.thesis__lede:first-of-type::first-letter {
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 600;
  float: left;
  font-size: 3.6em;
  line-height: 0.85;
  padding: 0.05em 0.12em 0 0;
  color: var(--accent);
  text-shadow: var(--glow-cyan-text);
}
.editorial-image {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 16px 32px rgba(0,0,0,0.3), var(--inner-highlight);
  border: 1px solid var(--border);
  background: var(--surface-1);
}
.editorial-image img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  display: block;
}
@media (min-width: 900px) {
  .editorial-image img {
    max-height: 400px;
  }
}
.editorial-image figcaption {
  padding: 1rem 1.25rem;
  background: var(--surface-grad);
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
  font-style: italic;
  border-top: 1px solid var(--border);
}

/* Calculator ------------------------------------------------------------ */
.calc {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(4rem, 8vw, 6rem);
  background: radial-gradient(ellipse at 50% 0%, rgba(125,211,252,0.04) 0%, transparent 60%);
}
.calc__title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  margin-bottom: 0.4em;
}
.calc__lede {
  color: var(--text-dim);
  font-size: 1.0625rem;
  max-width: 42em;
  margin-bottom: 2.5rem;
}
.calc__card {
  display: grid;
  gap: 0;
  background: linear-gradient(180deg, rgba(30,41,59,0.55) 0%, rgba(15,23,42,0.55) 100%);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glow-cyan-soft), var(--inner-highlight);
  overflow: hidden;
}
@media (min-width: 880px) {
  .calc__card { grid-template-columns: 1.15fr 1fr; }
}
.calc__form {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 1.25rem;
}

.field {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.field--full { grid-column: 1 / -1; }
.field label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}
.field__unit {
  color: var(--text-muted);
  font-weight: 400;
}
.field__hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}
.field input[type="number"],
.field input[type="email"],
.field select {
  width: 100%;
  padding: 0.7em 0.9em;
  background: rgba(10, 14, 26, 0.55);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color var(--t-base), box-shadow var(--t-base), background var(--t-base);
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(125,211,252,0.2);
  background: rgba(10, 14, 26, 0.85);
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none' stroke='%237dd3fc' stroke-width='1.5'><path d='M1 1l5 5 5-5'/></svg>");
  background-repeat: no-repeat;
  background-position: right 1em center;
  padding-right: 2.5em;
  font-weight: 500;
}
.field select option { background: #0f172a; color: var(--text); }

.calc__actions {
  margin-top: 1.5rem;
}
.calc__submit {
  width: 100%;
  justify-content: center;
  padding: 1.15em 1.5em;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 0 20px rgba(125,211,252,0.25), var(--inner-highlight);
}
.calc__submit:hover {
  box-shadow: 0 0 35px rgba(125,211,252,0.4), var(--inner-highlight);
}

/* Range slider */
.field input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--accent) var(--ach-pct, 33%), rgba(255,255,255,0.1) var(--ach-pct, 33%));
  border-radius: 999px;
  cursor: pointer;
  margin: 0.5rem 0;
}
.field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: var(--glow-cyan-soft);
  cursor: pointer;
  transition: transform var(--t-fast);
}
.field input[type="range"]::-moz-range-thumb {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: var(--glow-cyan-soft);
  cursor: pointer;
}
.field input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.1); }
.field input[type="range"]:focus { outline: none; }
.field input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 4px rgba(125,211,252,0.35), var(--glow-cyan-soft);
}
output {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  font-size: 1.05em;
  margin-left: 0.25em;
}

/* Tooltip help button */
.field__help {
  position: absolute;
  top: -2px; right: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(255,255,255,0.04);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.field__help:hover,
.field__help:focus-visible {
  color: var(--bg);
  border-color: var(--accent);
  background: var(--accent);
}
.field__help::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 10px);
  right: -8px;
  width: max-content;
  max-width: 260px;
  padding: 0.75em 1em;
  background: #0f172a;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 400;
  line-height: 1.45;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 30px rgba(0,0,0,0.6);
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity var(--t-fast), transform var(--t-fast);
  z-index: 10;
  text-align: left;
  letter-spacing: 0;
}
.field__help:hover::after,
.field__help:focus-visible::after,
.field__help[aria-expanded="true"]::after {
  opacity: 1;
  transform: translateY(0);
}

/* Results panel */
.calc__results {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  background: linear-gradient(180deg, rgba(125,211,252,0.05) 0%, rgba(15,23,42,0.6) 100%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}
@media (min-width: 880px) {
  .calc__results { border-left: 1px solid var(--border); }
}
@media (max-width: 879px) {
  .calc__results { border-top: 1px solid var(--border); }
}

.results__primary {
  text-align: center;
  padding: 1.5rem 1rem;
  background: rgba(10, 14, 26, 0.5);
  border: 1px solid rgba(125,211,252,0.2);
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 20px rgba(125,211,252,0.05);
}
.results__label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem 0;
}
.results__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(3.5rem, 8vw, 5.5rem);
  line-height: 1;
  color: var(--text);
  text-shadow: var(--glow-cyan-text);
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.results__meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0.5rem 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.results__meta div { min-width: 0; }
.results__meta dt {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35em;
}
.results__meta dd {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-dim);
  margin: 0;
}

.results__explanation {
  background: rgba(255,255,255,0.02);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-strong);
}
.results__copy {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}

.noscript {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: rgba(167,139,250,0.08);
  border: 1px solid rgba(167,139,250,0.2);
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Picks ----------------------------------------------------------------- */
.picks { margin-top: clamp(4rem, 8vw, 6rem); }
.picks__title { 
  font-size: clamp(1.75rem, 3vw, 2.5rem); 
  margin-bottom: 0.5em; 
  color: var(--text); 
}
.picks__note {
  background: rgba(125, 211, 252, 0.06);
  border: 1px solid rgba(125, 211, 252, 0.2);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--glow-cyan-soft);
}

.picks__grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) { .picks__grid { grid-template-columns: repeat(3, 1fr); } }

.pick {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
  background: var(--surface-grad);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--inner-highlight), 0 8px 24px rgba(0,0,0,0.3);
  overflow: hidden;
  transition: transform var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
}
.pick:hover {
  transform: translateY(-4px);
  border-color: rgba(125,211,252,0.4);
  box-shadow: var(--glow-cyan), var(--inner-highlight);
}

.pick__header {
  padding: 1.5rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
}
.pick__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #0a0e1a;
  background: var(--accent);
  padding: 0.3em 0.7em;
  border-radius: 4px;
  margin: 0 0 0.75rem 0;
  box-shadow: var(--glow-cyan-soft);
}
.pick__tag[data-rank="great-alternative"] {
  background: var(--text-dim);
  box-shadow: none;
}
.pick__tag[data-rank="also-consider"] {
  background: var(--surface-1);
  color: var(--text-dim);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}

.pick__name { 
  font-size: 1.35rem; 
  margin: 0 0 0.5rem; 
  color: var(--text);
}

.pick__stats {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.stat__label {
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  margin-right: 0.25em;
}
.stat-divider {
  width: 1px;
  height: 12px;
  background: var(--border-strong);
}
.stat--status {
  color: var(--accent);
  font-weight: 500;
}

.pick__why {
  background: rgba(125,211,252,0.06);
  border-bottom: 1px solid rgba(125,211,252,0.15);
  padding: 1.25rem 1.5rem;
  font-size: 0.9rem;
}
.pick__why strong {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.pick__why strong::before {
  content: '';
  display: inline-block;
  width: 16px; height: 16px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237dd3fc' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M22 11.08V12a10 10 0 1 1-5.93-9.14'></path><polyline points='22 4 12 14.01 9 11.01'></polyline></svg>");
}
.pick__why p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.5;
}

.pick__body {
  padding: 1.25rem 1.5rem 0;
  flex-grow: 1;
}

.pick__best {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--text-dim);
}
.pick__best strong {
  color: var(--text);
}

.pick__strengths {
  margin: 0 0 1rem;
  padding-left: 0;
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-dim);
}
.pick__strengths li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.4rem;
}
.pick__strengths li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.pick__tradeoff {
  background: rgba(0,0,0,0.2);
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}
.pick__tradeoff strong {
  display: block;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
}
.pick__tradeoff p {
  margin: 0;
  color: #94a3b8;
  line-height: 1.5;
}

.pick__action {
  padding: 1rem 1.5rem 1.5rem;
}

.btn--amazon {
  width: 100%;
  justify-content: center;
  background: #f59e0b;
  color: #1e1e1e;
  border: 1px solid #d97706;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.2), inset 0 1px 0 rgba(255,255,255,0.4);
}
.btn--amazon:hover {
  background: #fbbf24;
  color: #000;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(245, 158, 11, 0.3), inset 0 1px 0 rgba(255,255,255,0.5);
  border-color: #b45309;
}

/* Why this matters ------------------------------------------------------ */
.why {
  padding: clamp(5rem, 8vw, 8rem) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(167,139,250,0.02) 0%, transparent 100%);
}
.why__header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.why__title {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  margin-bottom: 0.5em;
}
.why__lede {
  color: var(--text-dim);
  font-size: 1.125rem;
  line-height: 1.6;
}

.explainer-image {
  margin: 0 auto 4rem;
  max-width: 900px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-1);
  box-shadow: var(--glow-cyan-soft), var(--inner-highlight);
}
.explainer-image img { width: 100%; display: block; }
.explainer-image figcaption {
  padding: 1.25rem 1.5rem;
  background: rgba(10,14,26,0.6);
  color: var(--text-dim);
  font-size: 0.95rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.strategy-image {
  margin: 4rem auto 0;
}

.why__grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) { .why__grid { grid-template-columns: repeat(3, 1fr); } }

.why__card {
  padding: clamp(1.5rem, 2.5vw, 2rem);
  background: var(--surface-grad);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--inner-highlight);
  transition: transform var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
}
.why__card:hover {
  transform: translateY(-3px);
  border-color: rgba(125,211,252,0.3);
  box-shadow: var(--glow-cyan-soft), var(--inner-highlight);
}
.why__card h3 {
  font-size: 1.4rem;
  margin: 0.75rem 0 0.5rem;
}
.why__card p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}
.why__card strong {
  color: var(--text);
}
.why__icon {
  color: var(--accent);
  filter: drop-shadow(0 0 12px rgba(125,211,252,0.4));
}

/* Coming soon ----------------------------------------------------------- */
.soon {
  padding: clamp(5rem, 10vw, 8rem) 0;
  text-align: center;
}
.soon__title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  margin-bottom: 0.5em;
}
.soon__copy {
  color: var(--text-dim);
  margin: 0 auto 2.5rem;
  max-width: 38em;
  font-size: 1.05rem;
}
.soon__form {
  display: flex;
  gap: 0.75rem;
  max-width: 28rem;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}
.soon__form input[type="email"] {
  flex: 1 1 220px;
  padding: 0.95em 1.25em;
  background: rgba(10,14,26,0.55);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 1rem;
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
.soon__form input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(125,211,252,0.2);
}
.soon__form .btn { flex: 0 0 auto; }

/* Footer ---------------------------------------------------------------- */
.footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-size: 0.875rem;
}
.footer__inner { 
  display: flex; 
  flex-direction: column; 
  align-items: center;
  text-align: center;
  gap: 1.25rem; 
}
.footer__brand { color: var(--text-dim); margin: 0; font-weight: 500; }
.footer__disclosure { margin: 0 auto; line-height: 1.6; max-width: 50em; }
.footer__copy { margin: 0; opacity: 0.7; }

/* FAQ Styles */
.faq-list {
  margin-top: 2rem;
}
.faq-item {
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
  transition: border-color var(--t-base), background var(--t-base);
}
.faq-item:hover {
  border-color: var(--accent);
  background: rgba(125, 211, 252, 0.04);
}
.faq-item summary {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent);
  transition: transform var(--t-base);
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item p {
  padding: 0 1.5rem 1.5rem;
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Footer Nav */
.footer__nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-bottom: 0.5rem;
}
.footer__nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--t-base);
}
.footer__nav a:hover {
  color: var(--accent);
}

/* Guide Pages & Hub -------------------------------------------------------- */
.guides-hub {
  padding: clamp(3rem, 6vw, 4rem) 0;
}
.guides-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  margin-top: 3rem;
}
.guide-card {
  display: flex;
  flex-direction: column;
  background: var(--surface-grad);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
  box-shadow: var(--inner-highlight);
}
.guide-card:hover {
  transform: translateY(-4px);
  border-color: rgba(125,211,252,0.3);
  box-shadow: var(--glow-cyan-soft), var(--inner-highlight);
}
.guide-card__img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--surface-1);
  border-bottom: 1px solid var(--border);
}
.guide-card__content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.guide-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.guide-card__excerpt {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}
.guide-card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
}
.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover {
  color: var(--accent);
}

/* Info block / Diagram component */
.info-block {
  margin: 3rem 0;
  padding: 2rem;
  background: rgba(125,211,252,0.03);
  border: 1px solid rgba(125,211,252,0.1);
  border-radius: var(--radius-md);
}
.info-block h3 {
  margin-top: 0;
  color: var(--accent);
}

/* Guide Images ------------------------------------------------------------ */

.guide-hero-image {
  margin: 2rem 0 3rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.guide-hero-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-hero-image figcaption {
  padding: 1rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.5;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.01);
  text-align: center;
}

/* Reduced motion -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero__video { display: none; }
  .hero__scroll { animation: none; }
}
.reduced-motion .hero__video { display: none; }