/* ==========================================================
   Présage marketing site — design system mirrors the iOS app
   ========================================================== */

:root {
  --surface-0: #060B10;
  --surface-1: #0C141B;
  --surface-2: #14202A;
  --surface-3: #1A2935;

  --text-1: #F2EDE6;
  --text-2: #8B9AA6;
  --text-3: #4A5A66;

  --accent: #2FA8A8;
  --accent-bright: #3FCFCF;
  --accent-glow: rgba(63, 207, 207, 0.42);
  --accent-coral: #D27D5A;
  --accent-coral-bright: #E89472;

  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;

  --space-xs: 6px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 56px;
  --space-2xl: 96px;
  --space-3xl: 128px;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro", "Inter", system-ui, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, monospace;

  --shadow-card: 0 16px 40px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  --shadow-glow: 0 0 80px rgba(47, 168, 168, 0.18);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--surface-0);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "ss03", "cv11";
  line-height: 1.55;
  overflow-x: hidden;
}

a {
  color: var(--accent-bright);
  text-decoration: none;
  transition: color 150ms ease;
}

a:hover {
  color: var(--text-1);
}

/* Layered atmospheric blooms */
body::before,
body::after {
  content: "";
  position: fixed;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 1600px;
  height: 1600px;
  background: radial-gradient(circle at 50% 50%, rgba(47, 168, 168, 0.10) 0%, transparent 55%);
}

body::after {
  bottom: -40%;
  right: -10%;
  width: 1200px;
  height: 1200px;
  background: radial-gradient(circle at 50% 50%, rgba(210, 125, 90, 0.06) 0%, transparent 55%);
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
  z-index: 1;
}

/* ===== SCROLL PROGRESS ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  width: 0%;
  z-index: 100;
  transition: width 80ms linear;
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ===== NAV ===== */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(6, 11, 16, 0.65);
  border-bottom: 1px solid transparent;
  transition: border-bottom-color 200ms ease;
}

nav.scrolled {
  border-bottom-color: var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.4px;
  color: var(--text-1);
}

.brand .glyph {
  width: 22px;
  height: 22px;
  border: 1.6px solid var(--text-1);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.brand .glyph::after {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 3.6s var(--ease-out-expo) infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { transform: scale(1.1); box-shadow: 0 0 0 6px transparent; }
}

nav .links {
  display: flex;
  gap: 28px;
  font-size: 14px;
}

nav .links a {
  color: var(--text-2);
}

nav .links a:hover {
  color: var(--text-1);
}

@media (max-width: 600px) {
  nav .links {
    display: none;
  }
}

/* ===== REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 800ms var(--ease-out-expo), transform 800ms var(--ease-out-expo);
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 700ms var(--ease-out-expo), transform 700ms var(--ease-out-expo);
}

.reveal-stagger.in > *:nth-child(1) { transition-delay: 50ms; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: 130ms; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: 210ms; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: 290ms; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: 370ms; }
.reveal-stagger.in > *:nth-child(6) { transition-delay: 450ms; }
.reveal-stagger.in > *:nth-child(7) { transition-delay: 530ms; }
.reveal-stagger.in > *:nth-child(8) { transition-delay: 610ms; }
.reveal-stagger.in > *:nth-child(9) { transition-delay: 690ms; }

.reveal-stagger.in > * {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-stagger > * { opacity: 1 !important; transform: none !important; transition: none !important; }
  .brand .glyph::after { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===== HERO ===== */
.hero {
  padding: 80px 0 140px;
  text-align: center;
  position: relative;
}

.hero-bg-curve {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -45%);
  width: min(1100px, 90vw);
  height: 600px;
  pointer-events: none;
  opacity: 0.4;
  z-index: -1;
}

.hero .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent);
  padding: 6px 12px;
  border: 1px solid rgba(47, 168, 168, 0.3);
  border-radius: 999px;
  margin-bottom: 28px;
  background: rgba(47, 168, 168, 0.06);
}

.hero .badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 3.6s ease-in-out infinite;
}

.hero h1 {
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -2.5px;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero h1 .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(20px) rotateX(-30deg);
  animation: word-in 900ms var(--ease-out-expo) forwards;
}

.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent-bright), var(--accent));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

@keyframes word-in {
  to { opacity: 1; transform: translateY(0) rotateX(0); }
}

.hero p.lede {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--text-2);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.55;
  opacity: 0;
  animation: fade-up 1000ms 700ms var(--ease-out-expo) forwards;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 1000ms 1000ms var(--ease-out-expo) forwards;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.2px;
  transition: transform 220ms var(--ease-out-back), background 200ms ease, box-shadow 240ms ease;
  cursor: pointer;
  position: relative;
  border: none;
  font-family: inherit;
  user-select: none;
}

.cta-primary {
  background: var(--accent);
  color: #001818;
  box-shadow: 0 8px 32px rgba(47, 168, 168, 0.25), 0 0 0 1px rgba(63, 207, 207, 0.3) inset;
}

.cta-primary:hover {
  background: var(--accent-bright);
  color: #001818;
  transform: translateY(-2px);
  box-shadow: 0 16px 48px rgba(47, 168, 168, 0.45), 0 0 0 1px rgba(63, 207, 207, 0.5) inset;
}

.cta-secondary {
  background: var(--surface-2);
  color: var(--text-1);
  border: 1px solid var(--border-strong);
}

.cta-secondary:hover {
  background: var(--surface-3);
  color: var(--text-1);
  transform: translateY(-1px);
}

/* Scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 1.4px;
  text-transform: uppercase;
  animation: fade-up 1000ms 1400ms var(--ease-out-expo) backwards;
}

.scroll-cue .line {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, transparent, var(--text-3));
  position: relative;
  overflow: hidden;
}

.scroll-cue .line::after {
  content: "";
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(to bottom, transparent, var(--accent));
  animation: scroll-trickle 2.4s var(--ease-out-expo) infinite;
}

@keyframes scroll-trickle {
  to { top: 100%; }
}

/* ===== HOOK SECTION (the gap) ===== */
.hook {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.hook .stat-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
}

@media (max-width: 700px) {
  .hook .stat-row {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-md);
  }
}

.hook .stat {
  text-align: center;
}

.hook .stat .num {
  font-size: clamp(60px, 9vw, 110px);
  font-weight: 700;
  letter-spacing: -3px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  display: inline-block;
  position: relative;
}

.hook .stat:first-child .num {
  color: var(--accent-coral);
  text-shadow: 0 0 60px rgba(210, 125, 90, 0.25);
}

.hook .stat:last-child .num {
  color: var(--accent);
  text-shadow: 0 0 60px var(--accent-glow);
}

.hook .stat .label {
  margin-top: 12px;
  color: var(--text-2);
  font-size: 14px;
  letter-spacing: 0.4px;
  max-width: 220px;
  margin-left: auto;
  margin-right: auto;
}

.hook .gap-arc {
  width: 100px;
  height: 100px;
}

@media (max-width: 700px) {
  .hook .gap-arc {
    transform: rotate(90deg);
  }
}

.hook .caption {
  text-align: center;
  margin-top: 64px;
  font-size: 19px;
  color: var(--text-2);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hook .caption strong {
  color: var(--text-1);
  font-weight: 600;
}

/* ===== INTERACTIVE PREDICTION DEMO ===== */
.demo {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-top: 1px solid var(--border);
  position: relative;
}

.demo h2,
.mechanic h2,
.features h2,
.privacy h2,
.math h2 {
  font-size: clamp(32px, 4.5vw, 50px);
  font-weight: 700;
  letter-spacing: -1.4px;
  margin-bottom: 16px;
  text-align: center;
}

.section-lede {
  text-align: center;
  max-width: 660px;
  margin: 0 auto 64px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.65;
}

.demo-card {
  max-width: 520px;
  margin: 0 auto;
  background: linear-gradient(180deg, var(--surface-2) 0%, var(--surface-1) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-card), 0 0 80px rgba(47, 168, 168, 0.04);
  position: relative;
  overflow: hidden;
}

.demo-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 20%, var(--accent-bright) 50%, transparent 80%);
  opacity: 0.5;
}

.demo-step {
  display: none;
}

.demo-step.active {
  display: block;
  animation: demo-step-in 500ms var(--ease-out-expo);
}

@keyframes demo-step-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.demo-step .step-label {
  font-size: 11px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.demo-step .step-label .step-dots {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.demo-step .step-label .step-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--surface-3);
}

.demo-step .step-label .step-dots span.on {
  background: var(--accent);
}

.demo-step h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: -0.4px;
}

.demo-step .field {
  margin-bottom: 20px;
}

.demo-step label {
  display: block;
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 8px;
  letter-spacing: 0.2px;
}

.demo-step input[type="text"] {
  width: 100%;
  background: var(--surface-3);
  border: 1px solid transparent;
  color: var(--text-1);
  font-family: inherit;
  font-size: 15px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  transition: border-color 150ms;
}

.demo-step input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

/* Confidence slider — custom styled */
.conf-display {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 4px;
}

.conf-display .pct {
  font-size: 44px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1.6px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.conf-display .qual {
  font-size: 13px;
  color: var(--text-2);
  letter-spacing: 0.3px;
}

.conf-track {
  position: relative;
  height: 32px;
  display: flex;
  align-items: center;
}

.conf-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--surface-3);
  border-radius: 999px;
  top: 50%;
  transform: translateY(-50%);
}

.conf-track .fill {
  position: absolute;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  border-radius: 999px;
  top: 50%;
  transform: translateY(-50%);
  transition: width 80ms ease;
  box-shadow: 0 0 12px var(--accent-glow);
}

.conf-track input[type="range"] {
  width: 100%;
  height: 32px;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  position: relative;
  z-index: 2;
  cursor: pointer;
}

.conf-track input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.45), 0 0 0 8px rgba(47, 168, 168, 0.15);
  cursor: grab;
  transition: transform 120ms;
}

.conf-track input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.15);
  cursor: grabbing;
}

.conf-track input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.45), 0 0 0 8px rgba(47, 168, 168, 0.15);
  cursor: grab;
}

.conf-marks {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}

.demo-step .helper {
  font-size: 12px;
  color: var(--text-3);
  margin-top: 6px;
}

.demo-step .submit {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: #001818;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 200ms, transform 200ms;
  margin-top: 8px;
}

.demo-step .submit:hover { background: var(--accent-bright); }
.demo-step .submit:active { transform: scale(0.98); }
.demo-step .submit:disabled { opacity: 0.4; cursor: not-allowed; }

/* Step 2: hidden confidence reveal */
.hidden-pill {
  background: var(--surface-3);
  border-radius: 999px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-2);
  filter: blur(4px);
  transition: filter 600ms var(--ease-out-expo);
  user-select: none;
}

.hidden-pill.unblur { filter: blur(0); }

.outcome-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin: 22px 0;
}

@media (max-width: 480px) {
  .outcome-row { grid-template-columns: 1fr; }
}

.outcome-btn {
  padding: 16px 12px;
  border: 1px solid var(--border-strong);
  background: var(--surface-3);
  color: var(--text-1);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  transition: border-color 150ms, background 150ms, transform 150ms;
}

.outcome-btn:hover {
  border-color: var(--accent);
  background: rgba(47, 168, 168, 0.08);
  transform: translateY(-1px);
}

.outcome-btn .label-strong {
  display: block;
  font-weight: 600;
  margin-bottom: 4px;
}

.outcome-btn .label-sub {
  display: block;
  font-size: 11px;
  color: var(--text-2);
}

/* Step 3: reveal */
.reveal-card {
  text-align: center;
  padding: 8px 0;
}

.reveal-card .badge-result {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.reveal-card .badge-result.correct {
  background: rgba(47, 168, 168, 0.15);
  color: var(--accent-bright);
  border: 1px solid rgba(47, 168, 168, 0.3);
}

.reveal-card .badge-result.incorrect {
  background: rgba(210, 125, 90, 0.15);
  color: var(--accent-coral);
  border: 1px solid rgba(210, 125, 90, 0.3);
}

.reveal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 24px 0;
}

.reveal-cell {
  padding: 18px 14px;
  background: var(--surface-3);
  border-radius: var(--radius-md);
}

.reveal-cell .lbl {
  font-size: 10px;
  color: var(--text-3);
  letter-spacing: 1.4px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.reveal-cell .val {
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.6px;
}

.reveal-cell.you .val { color: var(--accent); }
.reveal-cell.reality .val { color: var(--text-1); }

.brier-impact {
  margin-top: 16px;
  padding: 16px;
  background: rgba(47, 168, 168, 0.08);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--text-1);
  line-height: 1.6;
}

.brier-impact .formula {
  font-family: var(--font-mono);
  color: var(--accent-bright);
  margin-top: 6px;
  font-size: 13px;
}

.demo-step .restart {
  margin-top: 18px;
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border-strong);
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: color 150ms, border-color 150ms;
}

.demo-step .restart:hover {
  color: var(--text-1);
  border-color: var(--accent);
}

/* ===== HONESTY MECHANIC PHASE CARDS ===== */
.mechanic {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.mechanic .lede {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.6;
}

.mechanic-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 980px;
  margin: 0 auto;
}

@media (max-width: 800px) {
  .mechanic-flow {
    grid-template-columns: 1fr;
  }
}

.phase-card {
  background: linear-gradient(180deg, var(--surface-2) 0%, var(--surface-1) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: border-color 300ms, transform 400ms var(--ease-out-expo);
}

.phase-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}

.phase-card .step {
  font-size: 11px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.phase-card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 10px;
}

.phase-card p {
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.6;
}

.phase-card.hidden-confidence {
  background: linear-gradient(180deg, rgba(210, 125, 90, 0.10) 0%, var(--surface-1) 100%);
  border-color: rgba(210, 125, 90, 0.25);
}

.phase-card.hidden-confidence .step {
  color: var(--accent-coral);
}

.phase-card.hidden-confidence .blur-bar {
  display: inline-block;
  background: var(--surface-3);
  color: transparent;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  filter: blur(4px);
  user-select: none;
}

/* ===== FEATURES ===== */
.features {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.features .lede {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.6;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 900px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.feature {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 200ms ease, transform 200ms ease;
  position: relative;
  overflow: hidden;
}

.feature::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), rgba(47, 168, 168, 0.08), transparent 40%);
  opacity: 0;
  transition: opacity 300ms;
  pointer-events: none;
}

.feature:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.feature:hover::before {
  opacity: 1;
}

.feature .icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(47, 168, 168, 0.16);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}

.feature.coral .icon {
  background: rgba(210, 125, 90, 0.16);
  color: var(--accent-coral);
}

.feature h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.2px;
  margin-bottom: 6px;
  position: relative;
  z-index: 1;
}

.feature p {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.55;
  position: relative;
  z-index: 1;
}

/* ===== PRIVACY ===== */
.privacy {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.privacy-card {
  max-width: 720px;
  margin: 48px auto 0;
  background: linear-gradient(180deg, rgba(47, 168, 168, 0.08) 0%, var(--surface-1) 100%);
  border: 1px solid rgba(47, 168, 168, 0.25);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.privacy-card::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg, transparent 0deg, rgba(63, 207, 207, 0.10) 90deg, transparent 180deg);
  animation: rotate-glow 14s linear infinite;
  pointer-events: none;
  z-index: 0;
}

.privacy-card > * { position: relative; z-index: 1; }

@keyframes rotate-glow {
  to { transform: rotate(360deg); }
}

.privacy-card .label {
  font-size: 11px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.privacy-card h3 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 14px;
}

.privacy-card p {
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.privacy-counters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 480px;
  margin: 0 auto 28px;
}

.privacy-counter {
  text-align: center;
}

.privacy-counter .num {
  font-size: 38px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
  font-variant-numeric: tabular-nums;
}

.privacy-counter .lbl {
  font-size: 11px;
  color: var(--text-2);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-top: 4px;
}

.privacy-card ul {
  list-style: none;
  text-align: left;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
  max-width: 520px;
  margin: 0 auto;
}

@media (max-width: 600px) {
  .privacy-card ul {
    grid-template-columns: 1fr;
  }
}

.privacy-card ul li {
  font-size: 13px;
  color: var(--text-1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.privacy-card ul li::before {
  content: "✓";
  color: var(--accent);
  font-weight: 700;
}

/* ===== MATH (interactive Brier calculator) ===== */
.math {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.math .lede {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.6;
}

.brier-calc {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 700px) {
  .brier-calc { grid-template-columns: 1fr; }
}

.brier-calc .controls h3 {
  font-size: 13px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 18px;
}

.brier-calc .controls .field { margin-bottom: 22px; }

.brier-calc .conf-display .pct { font-size: 36px; }

.outcome-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--surface-3);
  border-radius: var(--radius-md);
  padding: 4px;
}

.outcome-toggle button {
  padding: 12px;
  background: transparent;
  border: none;
  border-radius: 10px;
  color: var(--text-2);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 200ms, color 200ms;
}

.outcome-toggle button.on {
  background: var(--accent);
  color: #001818;
  box-shadow: 0 4px 16px rgba(47, 168, 168, 0.3);
}

.outcome-toggle button.no.on {
  background: var(--accent-coral);
  color: #001818;
  box-shadow: 0 4px 16px rgba(210, 125, 90, 0.3);
}

.brier-output {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brier-output .lbl {
  font-size: 13px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 18px;
}

.brier-output .score {
  font-size: 72px;
  font-weight: 700;
  letter-spacing: -3px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  text-shadow: 0 0 60px var(--accent-glow);
  transition: color 240ms;
}

.brier-output.bad .score { color: var(--accent-coral); }

.brier-output .formula {
  font-family: var(--font-mono);
  margin-top: 18px;
  font-size: 14px;
  color: var(--text-2);
}

.brier-output .formula .num {
  color: var(--accent-bright);
}

.brier-scale {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  font-size: 12px;
  color: var(--text-2);
  position: relative;
}

.brier-scale-bar {
  grid-column: 1 / -1;
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--text-3) 25%, var(--accent-coral) 100%);
  border-radius: 999px;
  position: relative;
  margin-bottom: 8px;
}

.brier-scale-pointer {
  position: absolute;
  top: -5px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  border: 4px solid var(--accent);
  transform: translateX(-50%);
  transition: left 240ms var(--ease-out-expo), border-color 240ms;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.brier-scale .pt {
  text-align: center;
}

.brier-scale .pt .num {
  display: block;
  font-size: 18px;
  color: var(--text-1);
  font-weight: 600;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.brier-scale .pt:nth-child(2) .num { color: var(--accent); }
.brier-scale .pt:nth-child(4) .num { color: var(--accent-coral); }

/* ===== FINAL CTA ===== */
.final {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
  position: relative;
}

.final::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(47, 168, 168, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.final h2 {
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 700;
  letter-spacing: -1.6px;
  margin-bottom: 16px;
  position: relative;
}

.final h2 .accent {
  background: linear-gradient(135deg, var(--accent-bright), var(--accent));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.final p {
  color: var(--text-2);
  font-size: 17px;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* ===== FOOTER ===== */
footer {
  padding: var(--space-xl) 0 60px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-3);
}

footer .row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

footer .row a {
  color: var(--text-2);
  margin-right: 24px;
}

footer .row a:hover {
  color: var(--text-1);
}

footer .credit {
  margin-top: 32px;
  color: var(--text-3);
  font-size: 12px;
}

/* ===== ARTICLE PAGES ===== */
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 20px;
}

.article h1 {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  letter-spacing: -1.4px;
  margin-bottom: 12px;
}

.article .meta {
  color: var(--text-3);
  font-size: 13px;
  margin-bottom: 40px;
}

.article h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.4px;
  margin: 40px 0 14px;
  color: var(--text-1);
}

.article h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 10px;
  color: var(--text-1);
}

.article p {
  margin-bottom: 16px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.7;
}

.article p strong { color: var(--text-1); font-weight: 600; }
.article ul, .article ol { margin: 0 0 18px 22px; color: var(--text-2); font-size: 15px; line-height: 1.7; }
.article ul li, .article ol li { margin-bottom: 6px; }
.article ul li strong { color: var(--text-1); }
.article hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
.article .callout {
  background: rgba(47, 168, 168, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 16px 20px;
  margin: 24px 0;
  color: var(--text-1);
  font-size: 15px;
}
.article .back { display: inline-block; margin-bottom: 24px; color: var(--text-2); font-size: 13px; }
.article .back::before { content: "← "; }
.article code {
  font-family: var(--font-mono);
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--accent-bright);
}