/* ================================
   🌗 Appteck Landing v3.5
   Light / Dark + Scroll Reveal
================================ */

:root {
  --primary: #0074D9;
  --secondary: #00BFA6;
  --dark: #0f172a;
  --light: #f5f7fa;
  --white: #ffffff;
  --radius: 10px;
  --text: #0f172a;
  --bg: var(--light);
  --card-bg: var(--white);
}

[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e2e8f0;
  --card-bg: #111827;
}

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

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  color: var(--text);
  background-color: var(--bg);
  scroll-behavior: smooth;
  transition: background 0.4s ease, color 0.4s ease;
}

a { text-decoration: none; color: inherit; }

/* Header */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  background: var(--card-bg);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo { height: 55px; }

.navbar nav a {
  margin: 0 1rem;
  font-weight: 600;
  color: var(--text);
  transition: color 0.2s ease;
}
.navbar nav a:hover { color: var(--primary); }

.theme-btn {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.2s ease;
}
.theme-btn:hover { transform: translateY(-2px); }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  text-align: center;
  padding: 6rem 2rem;
  transition: background 0.4s ease;
}

.hero-content {
  max-width: 700px;
  margin: auto;
}

.hero h1 { font-size: 2.8rem; font-weight: 700; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; margin-bottom: 2rem; }

.cta-btn {
  background: #fff;
  color: var(--primary);
  font-weight: 600;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius);
  transition: all 0.2s ease;
}
.cta-btn:hover {
  background: var(--secondary);
  color: #fff;
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 4rem 8%;
  text-align: center;
}
.section.alt { background: var(--card-bg); }
.section h2 {
  color: var(--primary);
  margin-bottom: 2rem;
  font-size: 2rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.12);
}

/* Formulario */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 500px;
  margin: 2rem auto 0;
}
.contact-form input, .contact-form textarea {
  padding: 0.8rem;
  border-radius: var(--radius);
  border: 1px solid #d0d7de;
  font-size: 1rem;
  background: var(--card-bg);
  color: var(--text);
}
.contact-form button {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  padding: 0.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.contact-form button:hover { transform: translateY(-2px); }

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  background: var(--dark);
  color: #fff;
  font-size: 0.9rem;
}
footer a {
  color: var(--secondary);
  font-weight: 600;
}

/* ✨ Animaciones Reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}