/* ==========================================================================
   LANDING PAGE GUÍAS SANTILLANA SECUNDARIA 2026-2027
   Styles & Design System (Vanilla CSS with Modern Glassmorphism)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --font-primary: 'Plus Jakarta Sans', sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Color Palette */
  --bg-dark: #080C14;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-glass: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(99, 102, 241, 0.4);

  --accent-primary: #6366F1;
  --accent-secondary: #A855F7;
  --accent-pink: #EC4899;
  --accent-cyan: #06B6D4;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;

  --gradient-primary: linear-gradient(135deg, #6366F1 0%, #A855F7 50%, #EC4899 100%);
  --gradient-emerald: linear-gradient(135deg, #10B981 0%, #059669 100%);
  --gradient-amber: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
  --gradient-dark: linear-gradient(180deg, #080C14 0%, #0F172A 100%);

  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;

  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.25);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.5);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Animated Blobs */
.bg-glow-1, .bg-glow-2, .bg-glow-3 {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
}

.bg-glow-1 {
  top: -10%;
  left: 20%;
  width: 500px;
  height: 500px;
  background: #6366F1;
  animation: pulseGlow 8s infinite alternate ease-in-out;
}

.bg-glow-2 {
  top: 30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: #EC4899;
  animation: pulseGlow 10s infinite alternate-reverse ease-in-out;
}

.bg-glow-3 {
  bottom: 10%;
  left: -5%;
  width: 550px;
  height: 550px;
  background: #06B6D4;
  animation: pulseGlow 9s infinite alternate ease-in-out;
}

@keyframes pulseGlow {
  0% { transform: scale(1) translate(0, 0); opacity: 0.3; }
  100% { transform: scale(1.2) translate(30px, -20px); opacity: 0.5; }
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography Helpers */
.font-display {
  font-family: var(--font-display);
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-emerald {
  background: linear-gradient(135deg, #34D399 0%, #10B981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-amber {
  background: linear-gradient(135deg, #FBBF24 0%, #F59E0B 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.9rem 1.8rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  outline: none;
  position: relative;
  z-index: 1;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #FFFFFF;
  box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.5);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 35px -5px rgba(168, 85, 247, 0.6);
}

.btn-emerald {
  background: var(--gradient-emerald);
  color: #FFFFFF;
  box-shadow: 0 10px 25px -5px rgba(16, 185, 129, 0.5);
}

.btn-emerald:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 35px -5px rgba(16, 185, 129, 0.7);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1.15rem 2.2rem;
  font-size: 1.1rem;
}

/* Badge Pill */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #A5B4FC;
  font-size: 0.875rem;
  font-weight: 600;
  backdrop-filter: blur(8px);
  margin-bottom: 1.25rem;
}

.badge-pill.emerald {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
  color: #6EE7B7;
}

/* Header / Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(8, 12, 20, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  padding: 0.75rem 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.logo-brand img {
  height: 42px;
  width: auto;
  border-radius: 8px;
}

.logo-brand span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
  padding-top: 9rem;
  padding-bottom: 5rem;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-content p.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-checklist {
  list-style: none;
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.hero-checklist li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: #E2E8F0;
}

.hero-checklist li .icon-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.2);
  color: #34D399;
  font-size: 0.85rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: center;
}

/* Hero Video Mockup Frame */
.hero-media {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
}

.phone-mockup {
  position: relative;
  width: 310px;
  height: 620px;
  background: #0F172A;
  border-radius: 44px;
  border: 12px solid #1E293B;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.7),
              0 0 50px rgba(99, 102, 241, 0.3);
  overflow: hidden;
  z-index: 2;
}

.phone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 140px;
  height: 25px;
  background: #1E293B;
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 16px;
  z-index: 10;
}

.phone-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-overlay-play {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 12;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.video-overlay-play:hover {
  background: var(--accent-primary);
  transform: translateX(-50%) scale(1.05);
}

/* Badges Container Below Mockup */
.hero-badges-below {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
  max-width: 360px;
  z-index: 3;
}

.badge-item-below {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.badge-item-below:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.25);
}

.floating-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.floating-icon.purple { background: rgba(168, 85, 247, 0.2); color: #C084FC; }
.floating-icon.emerald { background: rgba(16, 185, 129, 0.2); color: #34D399; }

.floating-text h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.floating-text p {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.2;
  margin-top: 2px;
}

/* Section Header Base */
.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem auto;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.15rem;
  color: var(--text-muted);
}

/* Features Grid (3 PDFs + Plataforma) */
.features-section {
  padding: 6rem 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), 0 0 30px rgba(99, 102, 241, 0.15);
}

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

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

.feature-badge-corner {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(236, 72, 153, 0.2);
  color: #F472B6;
  border: 1px solid rgba(236, 72, 153, 0.3);
}

/* Grade Selector Section */
.grades-section {
  padding: 6rem 0;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.4) 0%, rgba(8, 12, 20, 0.8) 100%);
  position: relative;
}

.grade-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.9rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--gradient-primary);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.5);
}

.grade-content {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.grade-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.subjects-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}

.subject-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.3s ease;
}

.subject-chip:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  background: rgba(30, 41, 59, 0.9);
}

.subject-icon {
  font-size: 1.6rem;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.subject-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.subject-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Covers Gallery Showcase */
.gallery-section {
  padding: 6rem 0;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2rem;
}

.cover-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.35s ease;
  position: relative;
  group: true;
}

.cover-card:hover {
  transform: translateY(-10px) scale(1.02);
  border-color: var(--accent-secondary);
  box-shadow: 0 20px 40px rgba(168, 85, 247, 0.25);
}

.cover-img-wrap {
  width: 100%;
  height: 290px;
  overflow: hidden;
  position: relative;
  background: #0B0F19;
}

.cover-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.cover-card:hover .cover-img-wrap img {
  transform: scale(1.08);
}

.cover-card-body {
  padding: 1.25rem;
  text-align: center;
}

.cover-card-body h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.cover-card-body p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Interactive Platform Highlight Banner */
.platform-highlight {
  padding: 6rem 0;
  position: relative;
}

.platform-box {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 4rem 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.platform-box-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.platform-box-content h3 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.platform-box-content p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.platform-features-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.platform-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 0.98rem;
}

.platform-item-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.2);
  color: #A5B4FC;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Pricing / Offer CTA */
.pricing-section {
  padding: 6rem 0;
  position: relative;
}

.pricing-card {
  max-width: 700px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 2px solid var(--accent-emerald);
  border-radius: var(--radius-lg);
  padding: 3.5rem 3rem;
  text-align: center;
  position: relative;
  box-shadow: 0 0 50px rgba(16, 185, 129, 0.2);
}

.pricing-badge-popular {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-emerald);
  color: #FFF;
  padding: 0.4rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.pricing-card h3 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.pricing-includes-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  text-align: left;
}

.pricing-includes-box h4 {
  font-size: 1.05rem;
  color: var(--accent-emerald);
  margin-bottom: 1rem;
  text-align: center;
}

.pricing-checklist {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.pricing-checklist li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: 500;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: 3rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive Adjustments */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .hero-content h1 {
    font-size: 2.6rem;
  }

  .hero-content p.hero-subtitle {
    margin: 0 auto 2rem auto;
  }

  .hero-checklist {
    align-items: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .platform-box-grid {
    grid-template-columns: 1fr;
  }
}

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

  .hero-content h1 {
    font-size: 2.1rem;
  }

  .pricing-checklist, .platform-features-list {
    grid-template-columns: 1fr;
  }

  .phone-mockup {
    width: 270px;
    height: 540px;
  }
}