/* ============================================================
   MarkyMarkdown — Promotional Site Styles
   No external dependencies. GitHub Pages compatible.
   ============================================================ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #f0f4ff;
  --bg-alt:    #e8f0fe;
  --dark:      #0a0e15;
  --navy:      #1a2744;
  --accent:    #2c6fef;
  --accent-h:  #1a56d6;
  --muted:     #4a5778;
  --border:    rgba(44, 111, 239, 0.15);
  --card-bg:   #ffffff;
  --nav-bg:    rgba(240, 244, 255, 0.88);
  --callout-bg: rgba(44, 111, 239, 0.08);
  --radius:    12px;
  --font:      -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Helvetica, Arial, sans-serif;
  --shadow:    0 4px 24px rgba(26, 39, 68, 0.10);
  --shadow-lg: 0 12px 48px rgba(26, 39, 68, 0.16);

  /* Single source of truth for dark-palette values.
     Both the system-preference media query and the explicit
     [data-theme="dark"] override below alias the live theme
     variables to these. */
  --bg-dark:        #0d1320;
  --bg-alt-dark:    #141b2d;
  --dark-dark:      #05080f;
  --navy-dark:      #e8efff;
  --accent-dark:    #5b8def;
  --accent-h-dark:  #7aa3f5;
  --muted-dark:     #9aa7c7;
  --border-dark:    rgba(91, 141, 239, 0.22);
  --card-bg-dark:   #1a2236;
  --nav-bg-dark:    rgba(13, 19, 32, 0.85);
  --callout-bg-dark: rgba(91, 141, 239, 0.12);
  --shadow-dark:    0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg-dark: 0 12px 48px rgba(0, 0, 0, 0.5);
}

/* Dark theme — applied automatically with System default,
   or explicitly when the user picks Dark via the switcher.
   Both selectors below resolve to the same *-dark values
   defined once in :root above. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        var(--bg-dark);
    --bg-alt:    var(--bg-alt-dark);
    --dark:      var(--dark-dark);
    --navy:      var(--navy-dark);
    --accent:    var(--accent-dark);
    --accent-h:  var(--accent-h-dark);
    --muted:     var(--muted-dark);
    --border:    var(--border-dark);
    --card-bg:   var(--card-bg-dark);
    --nav-bg:    var(--nav-bg-dark);
    --callout-bg: var(--callout-bg-dark);
    --shadow:    var(--shadow-dark);
    --shadow-lg: var(--shadow-lg-dark);
  }
}
:root[data-theme="dark"] {
  --bg:        var(--bg-dark);
  --bg-alt:    var(--bg-alt-dark);
  --dark:      var(--dark-dark);
  --navy:      var(--navy-dark);
  --accent:    var(--accent-dark);
  --accent-h:  var(--accent-h-dark);
  --muted:     var(--muted-dark);
  --border:    var(--border-dark);
  --card-bg:   var(--card-bg-dark);
  --nav-bg:    var(--nav-bg-dark);
  --callout-bg: var(--callout-bg-dark);
  --shadow:    var(--shadow-dark);
  --shadow-lg: var(--shadow-lg-dark);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--navy);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Layout helpers ────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 24px;
}

section { padding-block: 80px; }

/* ── Nav ───────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 14px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--navy);
  text-decoration: none;
}

.nav-logo img {
  width: 32px;
  height: 32px;
  border-radius: 7px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--accent); text-decoration: none; }

.nav-links .btn-nav {
  background: var(--accent);
  color: #fff;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  transition: background 0.15s;
}

.nav-links .btn-nav:hover { background: var(--accent-h); text-decoration: none; }

/* ── Theme switcher (Light / System / Dark) ───────────────── */
.theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background: var(--callout-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  margin-left: 4px;
}

.theme-switch button {
  appearance: none;
  background: transparent;
  border: 0;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.theme-switch button:hover { color: var(--accent); }

.theme-switch button[aria-checked="true"] {
  background: var(--card-bg);
  color: var(--accent);
  box-shadow: var(--shadow);
}

.theme-switch button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px rgba(44, 111, 239, 0.35);
}

.btn-primary:hover {
  background: var(--accent-h);
  box-shadow: 0 4px 20px rgba(44, 111, 239, 0.45);
  text-decoration: none;
}

/* ── Hero ──────────────────────────────────────────────────── */
.hero-tagline {
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}

#hero {
  padding-block: 64px 80px;
  text-align: center;
  background: linear-gradient(160deg, var(--bg-alt) 0%, var(--bg) 100%);
}

.hero-image-wrap {
  margin-inline: auto;
  max-width: 860px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 40px;
}

.hero-image-wrap img { width: 100%; }

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.trust-badge {
  font-size: 14px;
  color: var(--muted);
  background: rgba(44, 111, 239, 0.08);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 16px;
  display: inline-block;
}

/* ── Privacy banner ────────────────────────────────────────── */
#privacy-banner {
  background: var(--dark);
  color: #e8efff;
  padding-block: 64px;
  text-align: center;
}

.privacy-banner-headline {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 32px;
}

.privacy-banner-padlock {
  font-size: 40px;
  margin-bottom: 12px;
}

.privacy-pillars {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.pillar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 160px;
}

.pillar-icon { font-size: 28px; }

.pillar-text {
  font-size: 14px;
  color: rgba(232, 239, 255, 0.75);
  font-weight: 500;
}

/* ── How it works ──────────────────────────────────────────── */
#how-it-works {
  background: var(--bg-alt);
  text-align: center;
}

.section-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  margin-bottom: 48px;
  color: var(--navy);
}

.steps {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.step {
  flex: 1 1 220px;
  max-width: 300px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: var(--shadow);
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
}

.step-icon { font-size: 32px; margin-bottom: 10px; }

.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }

.step p { font-size: 14px; color: var(--muted); }

.step-arrow {
  display: none;
}

/* ── Features ──────────────────────────────────────────────── */
#features { background: var(--bg); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
}

.feature-icon { font-size: 32px; margin-bottom: 12px; }

.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }

.feature-card p { font-size: 15px; color: var(--muted); }

/* ── Formats ───────────────────────────────────────────────── */
#formats {
  background: var(--bg-alt);
  text-align: center;
}

.format-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.format-badge {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--navy);
  box-shadow: var(--shadow);
}

/* ── Download CTA ──────────────────────────────────────────── */
#download {
  background: linear-gradient(160deg, var(--accent) 0%, #1a56d6 100%);
  text-align: center;
  color: #fff;
}

#download .section-title { color: #fff; margin-bottom: 12px; }

.download-sub {
  font-size: 17px;
  color: rgba(255,255,255,0.82);
  margin-bottom: 36px;
}

#download .btn-primary {
  background: #fff;
  color: var(--accent);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

#download .btn-primary:hover {
  background: #f0f4ff;
}

.os-badge {
  margin-top: 16px;
  font-size: 14px;
  color: rgba(255,255,255,0.65);
}

/* ── Footer ────────────────────────────────────────────────── */
footer {
  background: var(--dark);
  color: rgba(232,239,255,0.65);
  padding-block: 40px;
  text-align: center;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.footer-links a {
  color: rgba(232,239,255,0.75);
  transition: color 0.15s;
}

.footer-links a:hover { color: #fff; text-decoration: none; }

/* ── Privacy page ──────────────────────────────────────────── */
.privacy-hero {
  padding-block: 64px 48px;
  background: linear-gradient(160deg, var(--bg-alt) 0%, var(--bg) 100%);
  text-align: center;
}

.privacy-hero h1 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 12px;
}

.privacy-hero .subtitle {
  font-size: 18px;
  color: var(--muted);
}

.privacy-content {
  max-width: 760px;
  margin-inline: auto;
  padding-block: 48px 80px;
  padding-inline: 24px;
}

.privacy-section {
  margin-bottom: 48px;
}

.privacy-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 10px;
}

.privacy-section p, .privacy-section ul {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.75;
}

.privacy-section ul {
  padding-left: 20px;
}

.privacy-section ul li { margin-bottom: 6px; }

.callout {
  background: var(--callout-bg);
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 15px;
  color: var(--navy);
  font-weight: 500;
}

/* ── App Screenshot ────────────────────────────────────────── */
#screenshot {
  background: var(--bg-alt);
  text-align: center;
}

.screenshot-wrap {
  margin-inline: auto;
  max-width: 600px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 20px;
}

.screenshot-wrap img { width: 100%; }

.screenshot-caption {
  max-width: 600px;
  margin-inline: auto;
  font-size: 15px;
  color: var(--muted);
}

/* ── What is Markdown? ─────────────────────────────────────── */
#what-is-markdown { background: var(--bg); }

.markdown-explainer {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.markdown-text {
  flex: 1 1 340px;
}

.markdown-text p {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.markdown-text p:last-child { margin-bottom: 0; }

.markdown-links {
  flex: 0 0 280px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
}

.markdown-links h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.markdown-links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.markdown-links ul li a {
  font-size: 14px;
  color: var(--accent);
  line-height: 1.5;
}

.markdown-links ul li a:hover { text-decoration: underline; }

/* ── Responsive breakpoints ────────────────────────────────── */

/* Tablet & small laptop */
@media (max-width: 900px) {
  .markdown-explainer { gap: 32px; }
  .markdown-links { flex: 1 1 100%; }
  .hero-image-wrap { max-width: 100%; }
}

/* Tablet portrait & large phones */
@media (max-width: 768px) {
  section { padding-block: 64px; }
  #hero { padding-block: 48px 64px; }
  #privacy-banner { padding-block: 48px; }
  .section-title { margin-bottom: 36px; }

  .nav-inner {
    flex-wrap: wrap;
    gap: 8px 16px;
  }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 14px; }

  .privacy-pillars { gap: 20px; }
  .pillar { min-width: 130px; }

  .features-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

/* Phones */
@media (max-width: 640px) {
  body { font-size: 16px; }

  .container { padding-inline: 18px; }

  nav { position: static; }
  .nav-inner { padding-block: 12px; }
  .nav-logo { font-size: 16px; }
  .nav-logo img { width: 28px; height: 28px; }
  .nav-links {
    gap: 4px 14px;
    flex-wrap: wrap;
    justify-content: flex-end;
  }
  .nav-links a {
    /* Ensure ≥44px tap target height per iOS HIG */
    padding: 10px 0;
    font-size: 14px;
  }
  .nav-links .btn-nav {
    padding: 10px 18px;
    font-size: 14px;
  }

  section { padding-block: 48px; }
  #hero { padding-block: 32px 48px; }
  .hero-tagline { margin-bottom: 24px; }
  .hero-image-wrap { border-radius: 12px; margin-bottom: 28px; }

  .btn { padding: 14px 24px; font-size: 16px; }
  .hero-cta .btn-primary { width: 100%; max-width: 320px; justify-content: center; }
  #download .btn-primary { width: 100%; max-width: 320px; justify-content: center; }

  .steps { flex-direction: column; align-items: stretch; gap: 16px; }
  .step { max-width: 100%; padding: 24px 20px; }

  .features-grid { grid-template-columns: 1fr; gap: 16px; }
  .feature-card { padding: 24px 20px; }

  .format-badges { gap: 8px; }
  .format-badge { padding: 8px 14px; font-size: 14px; }

  .markdown-explainer { gap: 24px; }
  .markdown-links { padding: 22px 20px; }

  .privacy-content { padding-block: 36px 56px; }
  .privacy-section { margin-bottom: 36px; }
  .privacy-section h2 { font-size: 18px; }
  .privacy-section p, .privacy-section ul { font-size: 15px; }

  .footer-links { gap: 12px 20px; }
  .footer-links a { padding: 6px 0; }
}

/* Small phones (iPhone SE etc.) */
@media (max-width: 380px) {
  .container { padding-inline: 14px; }
  .nav-links a { font-size: 13px; }
  .nav-links .btn-nav { padding: 9px 14px; font-size: 13px; }
  .privacy-pillars { flex-direction: column; gap: 16px; }
  .pillar { min-width: 0; }
}