:root {
  --cream: #FDFBF7;
  --cream-deep: #F5F0E8;
  --ink: #2A2724;
  --ink-muted: #6B6560;
  --ink-faint: #A09890;
  --terracotta: #C4694A;
  --terracotta-light: #F0E0D8;
  --sage: #5A7A5C;
  --sage-light: #DDE8D8;
  --blue-montessori: #3A6FA8;
  --blue-light: #D8E6F5;
  --rule: rgba(42, 39, 36, 0.12);
  --font-serif: 'Lora', Georgia, serif;
  --font-sans: 'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ─── GRAIN OVERLAY ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

/* ─── TYPOGRAPHY ─── */
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 500; line-height: 1.25; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
p { color: var(--ink-muted); }
a { color: inherit; text-decoration: none; }

.label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ─── LAYOUT ─── */
.container { max-width: 1080px; margin: 0 auto; padding: 0 2rem; }
.container-narrow { max-width: 680px; margin: 0 auto; padding: 0 2rem; }
section { padding: 7rem 0; }

/* ─── NAV ─── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(253, 251, 247, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--terracotta);
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

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

  .nav-cta-group {
    display: flex;
    gap: 0.85rem;
    align-items: center;
  }

  .nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 1.5px solid var(--ink);
    border-radius: 4px;
    color: var(--ink);
    transition: background 0.2s, color 0.2s, transform 0.1s;
  }

  .nav-cta:hover { 
    background: var(--ink); 
    color: var(--cream);
    transform: translateY(-1px);
  }

  .nav-cta img {
    width: 20px;
    height: 20px;
    object-fit: contain;
  }

  .nav-cta:hover img {
    filter: invert(1);
  }

  .nav-cta img.android-nav {
    opacity: 0.5;
    filter: grayscale(1);
  }

  .nav-cta:hover img.android-nav {
    opacity: 1;
    filter: invert(1) grayscale(0);
  }

.nav-cta:hover { background: var(--ink); color: var(--cream); }

/* ─── DOWNLOAD BUTTONS ─── */
  .btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.8rem 1.75rem;
    background: var(--terracotta);
    color: var(--cream);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 2px;
    transition: background 0.2s, transform 0.15s;
  }

  .btn-download:hover { background: #b05c40; transform: translateY(-1px); }

.btn-download.disabled {
  background: var(--cream-deep);
  color: var(--ink-faint);
  border: 1px solid var(--rule);
  cursor: default;
}

.btn-download.disabled:hover { transform: none; opacity: 1; }

.btn-download-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  text-align: left;
}

.btn-download-label {
  font-size: 0.65rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
}

.btn-download-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

/* Invert Apple logo for the dark button */
.btn-download:not(.disabled) .btn-download-icon {
  filter: invert(1) brightness(1.5);
}

/* Grey out Android logo for the disabled button */
.btn-download.disabled .btn-download-icon {
  filter: grayscale(1);
  opacity: 0.3;
}

/* ─── HERO ─── */
.hero {
  padding: 10rem 0 6rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.hero-eyebrow-line {
  width: 32px;
  height: 1.5px;
  background: var(--terracotta);
}

.hero h1 {
  margin-bottom: 1.5rem;
  color: var(--ink);
}

.hero h1 em {
  font-style: italic;
  color: var(--terracotta);
}

.hero-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
  color: var(--ink-muted);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.75rem;
  background: var(--terracotta);
  color: var(--cream);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 2px;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover { background: #b05c40; transform: translateY(-1px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: color 0.2s;
}

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

/* ─── HERO DEVICE MOCKUP ─── */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.device-frame {
  width: 280px;
  background: var(--ink);
  border-radius: 36px;
  padding: 14px;
  box-shadow: 0 32px 64px rgba(42, 39, 36, 0.18), 0 0 0 1px rgba(42,39,36,0.08);
  position: relative;
}

.device-notch {
  width: 80px;
  height: 22px;
  background: var(--ink);
  border-radius: 0 0 14px 14px;
  margin: 0 auto 6px;
  position: relative;
  z-index: 2;
}

.device-screen {
  background: var(--cream);
  border-radius: 24px;
  overflow: hidden;
  aspect-ratio: 9/19;
  display: flex;
  flex-direction: column;
}

.screen-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--cream);
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  width: 100%;
}

.screen-letter {
  aspect-ratio: 1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
}

.screen-letter.vowel { background: var(--blue-light); color: var(--blue-montessori); }
.screen-letter.consonant { background: var(--terracotta-light); color: var(--terracotta); }

.screen-title {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--ink);
  font-weight: 500;
}

.screen-subtitle {
  font-size: 0.65rem;
  color: var(--ink-faint);
  text-align: center;
}

/* ─── DIVIDER ─── */
.divider {
  height: 1px;
  background: var(--rule);
}

/* ─── MANIFESTO ─── */
.manifesto {
  padding: 7rem 0;
  background: var(--ink);
  position: relative;
  overflow: hidden;
}

.manifesto::before {
  content: '"';
  font-family: var(--font-serif);
  font-size: 28rem;
  color: rgba(255,255,255,0.03);
  position: absolute;
  top: -6rem;
  left: -2rem;
  line-height: 1;
  pointer-events: none;
}

.manifesto blockquote {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  line-height: 1.5;
  color: #F5F0E8;
  font-weight: 400;
  font-style: italic;
  margin-bottom: 2rem;
}

.manifesto blockquote strong {
  font-style: normal;
  color: #fff;
  font-weight: 500;
}

.manifesto-attr {
  font-size: 0.85rem;
  color: rgba(245, 240, 232, 0.45);
  letter-spacing: 0.06em;
}

/* ─── ABOUT ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-portrait {
  background: var(--cream-deep);
  border-radius: 4px;
  aspect-ratio: 4/5;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule);
  overflow: hidden;
  position: relative;
}

.placeholder-text {
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  padding: 1rem;
}

.placeholder-dashes {
  position: absolute;
  inset: 12px;
  border: 1.5px dashed var(--rule);
  border-radius: 2px;
  pointer-events: none;
}

.about-body h2 { margin-bottom: 1.5rem; }
.about-body p { margin-bottom: 1.25rem; }

.about-signature {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--ink);
  margin-top: 2rem;
}

/* ─── APP SECTION ─── */
.app-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: end;
  margin-bottom: 5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--rule);
}

.app-label { margin-bottom: 1rem; }

.app-tagline {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--ink-muted);
  line-height: 1.6;
}

.app-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  background: var(--sage-light);
  color: var(--sage);
  border-radius: 2px;
  margin-bottom: 1.5rem;
}

/* ─── FEATURES ─── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 5rem;
}

.feature-card {
  background: var(--cream);
  padding: 2.5rem 2rem;
  transition: background 0.2s;
}

.feature-card:hover { background: var(--cream-deep); }

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.feature-icon.blue { background: var(--blue-light); }
.feature-icon.terra { background: var(--terracotta-light); }
.feature-icon.sage { background: var(--sage-light); }
.feature-icon.ink { background: var(--cream-deep); }

.feature-number {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-bottom: 0.5rem;
}

.feature-card h3 { margin-bottom: 0.75rem; color: var(--ink); font-size: 1.1rem; }
.feature-card p { font-size: 0.9rem; color: var(--ink-muted); }

/* ─── SCREENSHOTS ─── */
.screenshots-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.screenshot-frame {
  background: var(--cream-deep);
  border-radius: 12px;
  aspect-ratio: 9/16;
  border: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.screenshot-inner-dashes {
  position: absolute;
  inset: 10px;
  border: 1.5px dashed var(--rule);
  border-radius: 8px;
  pointer-events: none;
}

.screenshot-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ─── PHILOSOPHY PILLARS ─── */
.pillars {
  background: var(--cream-deep);
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  margin-top: 4rem;
}

.pillar {
  padding: 2.5rem;
  background: var(--cream);
  border-radius: 4px;
  border: 1px solid var(--rule);
  position: relative;
}

.pillar-number {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 500;
  color: rgba(42, 39, 36, 0.05);
  line-height: 1;
  pointer-events: none;
}

.pillar h3 { color: var(--ink); margin-bottom: 0.75rem; }
.pillar p { font-size: 0.9rem; }

.pillar-rule {
  width: 24px;
  height: 2px;
  background: var(--terracotta);
  margin-bottom: 1.25rem;
}

/* ─── TECH TRANSPARENCY ─── */
.tech-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 3rem;
  font-size: 0.9rem;
}

.tech-table th {
  text-align: left;
  padding: 0.75rem 0;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--rule);
}

.tech-table td {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-muted);
  vertical-align: top;
}

.tech-table td:first-child {
  color: var(--ink);
  font-weight: 500;
  width: 30%;
}

.tech-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--sage-light);
  color: var(--sage);
  border-radius: 2px;
  font-weight: 500;
}

/* ─── ROADMAP ─── */
.roadmap-list {
  margin-top: 3rem;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.roadmap-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 2rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}

.roadmap-phase {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.roadmap-phase.active { color: var(--terracotta); }

.roadmap-content h4 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.roadmap-content p { font-size: 0.875rem; }

/* ─── EMAIL SIGNUP ─── */
.signup-section {
  background: var(--ink);
  padding: 6rem 0;
}

.signup-inner {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
}

.signup-inner h2 { color: #F5F0E8; margin-bottom: 1rem; }
.signup-inner p { color: rgba(245, 240, 232, 0.6); margin-bottom: 2.5rem; }

.signup-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

.signup-input {
  flex: 1;
  min-width: 220px;
  padding: 0.8rem 1.25rem;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 2px;
  color: #F5F0E8;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.signup-input::placeholder { color: rgba(245, 240, 232, 0.35); }
.signup-input:focus { border-color: rgba(255,255,255,0.4); }

.btn-signup {
  padding: 0.8rem 1.75rem;
  background: var(--terracotta);
  color: var(--cream);
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.2s;
}

.btn-signup:hover { background: #b05c40; }

/* ─── FOOTER ─── */
footer {
  padding: 3rem 0;
  border-top: 1px solid var(--rule);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  font-family: var(--font-serif);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.footer-links a:hover { color: var(--ink); }

/* ─── FADE IN ANIMATIONS ─── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── COLLAPSIBLE SECTION ─── */
.collapsible-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.5rem 0;
  background: none;
  border: none;
  border-top: 1px solid var(--rule);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--ink);
  transition: color 0.2s;
}

.collapsible-trigger:hover { color: var(--terracotta); }

.collapsible-trigger .icon {
  transition: transform 0.3s ease;
}

.collapsible-trigger.active .icon {
  transform: rotate(180deg);
}

.collapsible-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s ease;
  overflow: hidden;
}

.collapsible-content.active {
  grid-template-rows: 1fr;
}

.collapsible-inner {
  min-height: 0;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; gap: 3rem; padding: 8rem 0 4rem; }
  .hero-visual { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .about-portrait { aspect-ratio: 3/2; }
  .features-grid { grid-template-columns: 1fr; }
  .screenshots-row { grid-template-columns: 1fr; }
  .pillars-grid { grid-template-columns: 1fr; }
  .app-header { grid-template-columns: 1fr; }
  .roadmap-item { grid-template-columns: 1fr; gap: 0.25rem; }
  .nav-links { display: none; }
}