@import url('https://fonts.googleapis.com/css2?family=Syne:wght@700;800&family=Figtree:wght@400;500;600&display=swap');

:root {
  --bg:         #fafaf9;
  --bg-alt:     #f2f1ef;
  --text:       #111110;
  --text-muted: #787770;
  --accent:     #1a56db;
  --accent-h:   #1447be;
  --border:     rgba(0,0,0,0.09);
  --card:       #ffffff;
  --shadow:     0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.06);
  --radius:     12px;
  --header-h:   60px;
}

.dark {
  --bg:         #0c0c0c;
  --bg-alt:     #141414;
  --text:       #f0ede8;
  --text-muted: #6b6b68;
  --accent:     #4d8ef5;
  --accent-h:   #6ba1f7;
  --border:     rgba(255,255,255,0.08);
  --card:       #191919;
  --shadow:     0 1px 3px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Figtree', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  transition: background 0.25s, color 0.25s;
}

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s, border-color 0.25s;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--text);
  flex-shrink: 0;
  transition: opacity 0.15s;
}
.logo:hover { opacity: 0.7; }

.logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}

/* Desktop nav — oculta por defecto, visible en 640px+ */
.nav-desktop {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

.nav-desktop a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.nav-desktop a:hover {
  color: var(--text);
  background: var(--bg-alt);
}

/* Theme toggle (compartido desktop y mobile) */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.25s;
}
.theme-toggle:hover { background: var(--bg-alt); }

/* Controles mobile (theme + hamburger) */
.nav-mobile-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Hamburger */
.hamburger {
  background: none;
  border: 1px solid var(--border);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: border-color 0.25s;
}

.hamburger span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s, background 0.25s;
  margin: 2px auto;
}

.hamburger.active span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* Mobile drawer */
.mobile-menu {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 auto 0;
  z-index: 99;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem 1rem;
  transition: background 0.25s;
}
.mobile-menu.open { display: block; }

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.mobile-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  transition: color 0.15s, background 0.15s;
}
.mobile-nav a:hover {
  color: var(--text);
  background: var(--bg-alt);
}

main { margin-top: var(--header-h); }

.section-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.hero {
  padding: 5rem 1.25rem;
  text-align: center;
}

.hero-inner {
  max-width: 680px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.75rem 1.75rem;
  border-radius: 100px;
  transition: background 0.15s, transform 0.15s;
}
.cta-btn:hover {
  background: var(--accent-h);
  transform: translateY(-1px);
}

.features {
  padding: 4rem 0;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s, border-color 0.25s;
}

.features h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 2.5rem;
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition:
    box-shadow 0.2s,
    transform 0.2s,
    background 0.25s,
    border-color 0.25s,
    opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

/* Override hover transform when card hasn't appeared yet */
.feature-card.fade-up:not(.visible):hover {
  transform: translateY(28px);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.875rem;
  display: block;
}

.feature-card h3 {
  font-family: 'Syne', sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.downloads {
  padding: 4rem 0;
}

.downloads h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.5rem;
  text-align: center;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 2.5rem;
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  max-width: 520px;
  margin: 0 auto;
}

.download-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.125rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition:
    border-color 0.15s,
    box-shadow 0.15s,
    transform 0.15s,
    background 0.25s,
    opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
.download-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent);
  transform: translateY(-1px);
}

/* Override hover transform when card hasn't appeared yet */
.download-card.fade-up:not(.visible):hover {
  transform: translateY(28px);
}

.os-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  object-fit: contain;
}

.download-info { flex: 1; }

.download-info h3 {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text);
}

.download-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.dl-arrow {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 600;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s, transform 0.15s;
}
.download-card:hover .dl-arrow {
  opacity: 1;
  transform: translateY(2px);
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 1.25rem;
  transition: border-color 0.25s;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.875rem;
  text-align: center;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.github-link:hover { color: var(--text); }

.github-stars {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ── Demo section ─────────────────────────────────────── */

.demo {
  padding: 4rem 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s, border-color 0.25s;
}

.demo h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.5rem;
  text-align: center;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.demo-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition:
    box-shadow 0.2s,
    transform 0.2s,
    background 0.25s,
    border-color 0.25s,
    opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}

.demo-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.demo-card.fade-up:not(.visible):hover {
  transform: translateY(28px);
}

.demo-video {
  width: 100%;
  max-height: 400px; /* video más grande */
  display: block;
  border-bottom: 1px solid var(--border);
  background: #000;
  object-fit: cover;
}

.demo-card h3 {
  font-family: 'Syne', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  margin: 0.75rem 1rem 0.25rem;
  color: var(--text);
}

.demo-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0 1rem 1rem;
}

/* Desktop: un video por row */
@media (min-width: 640px) {
  .demo-grid {
    grid-template-columns: 1fr;
    max-width: 640px;
    margin: 0 auto;
  }
}

@media (min-width: 960px) {
  .demo {
    padding: 5.5rem 0;
  }
  .demo-video {
    max-height: 480px;
  }
}

/* ── Fade-up scroll animation ───────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

/* ── Tablet+ (640px) ────────────────────────────────────── */
@media (min-width: 640px) {
  .nav-desktop         { display: flex; }
  .nav-mobile-controls { display: none; }
  .mobile-menu         { display: none !important; }

  .hero { padding: 6rem 1.25rem; }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .download-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 100%;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ── Desktop (960px) ────────────────────────────────────── */
@media (min-width: 960px) {
  .hero      { padding: 8rem 1.25rem 7rem; }
  .features  { padding: 5.5rem 0; }
  .downloads { padding: 5.5rem 0; }
}