/* Reset e Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --background: #0d0d0d;
  --foreground: #ffffff;
  --card: #141414;
  --card-foreground: #ffffff;
  --primary: #dc2626;
  --primary-foreground: #ffffff;
  --secondary: #facc15;
  --secondary-foreground: #000000;
  --muted: #1a1a1a;
  --muted-foreground: #a1a1aa;
  --accent: #22c55e;
  --accent-foreground: #000000;
  --border: #27272a;
  --radius: 0.5rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Source Sans 3', sans-serif;
  background-color: var(--background);
  color: var(--foreground);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-extrabold { font-weight: 800; }
.uppercase { text-transform: uppercase; }
.italic { font-style: italic; }
.tracking-wide { letter-spacing: 0.025em; }

.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-secondary { color: var(--secondary); }
.text-muted { color: var(--muted-foreground); }
.text-gray-600 { color: #4b5563; }
.text-gray-900 { color: #111827; }
.text-blue-600 { color: #2563eb; }
.text-red-400 { color: #f87171; }
.text-yellow { color: #f5c518; }

.bg-white { background-color: #ffffff; }
.bg-background { background-color: var(--background); }
.bg-card { background-color: var(--card); }
.bg-primary { background-color: var(--primary); }
.bg-accent { background-color: var(--accent); }
.bg-secondary { background-color: var(--secondary); }
.bg-muted { background-color: var(--muted); }
.bg-dark { background-color: #0a0a0a; }
.bg-gray-light { background-color: #f8f9fa; }

.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-full { border-radius: 9999px; }

.border { border: 1px solid var(--border); }
.border-red { border-color: #7f1d1d; }
.border-green { border-color: #14532d; }

.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.shadow-xl { box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1); }
.shadow-2xl { box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.container-sm { max-width: 768px; margin: 0 auto; }
.container-md { max-width: 896px; margin: 0 auto; }
.container-lg { max-width: 1024px; margin: 0 auto; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.flex-grow { flex-grow: 1; }
.shrink-0 { flex-shrink: 0; }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

/* Sections */
section {
  padding: 3rem 1rem;
}

.section-padding {
  padding: 3rem 1rem;
}

/* Hero Section */
.hero {
  background-color: #ffffff;
  text-align: center;
  overflow: hidden;
  padding-top: 0;
}
.hero-pencils {
  width: 100%;
  height: auto;
}

.hero-content {
  max-width: 768px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.hero-logo {
  height: 8rem;
  width: auto;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.125rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-block;
  font-weight: 700;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--primary-foreground);
}

.btn-primary:hover {
  background-color: #b91c1c;
}

.btn-accent {
  background-color: var(--accent);
  color: var(--accent-foreground);
}

.btn-accent:hover {
  background-color: #16a34a;
}

.btn-rounded {
  border-radius: 9999px;
}

.btn-lg {
  font-size: 1.125rem;
  padding: 1rem 2rem;
}

/* Pulse Animation */
.pulse-glow {
  animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 5px var(--accent), 0 0 10px var(--accent);
  }
  50% {
    box-shadow: 0 0 20px var(--accent), 0 0 30px var(--accent);
  }
}

/* Notification */
.notification {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: white;
  color: black;
  padding: 12px 16px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: fadeInUp 0.4s ease;
}

.notification.hidden {
  display: none;
}

.notification-icon {
  color: #22c55e;
}

.notification-icon svg {
  width: 20px;
  height: 20px;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Countdown */
.countdown-box {
  background: rgba(127, 29, 29, 0.2);
  border: 1px solid var(--primary);
  border-radius: 0.5rem;
  padding: 1rem;
  max-width: 400px;
  margin: 0 auto 1.5rem;
}

.countdown-label {
  color: #f87171;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.countdown-timer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.countdown-item {
  background: var(--primary);
  color: white;
  font-weight: 700;
  font-size: 1.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  min-width: 48px;
  text-align: center;
}

.countdown-separator {
  color: #f87171;
  font-size: 1.5rem;
  font-weight: 700;
}

.countdown-hint {
  color: var(--muted-foreground);
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

/* Product Mockup Section */
.mockup-section {
  background-color: #ffffff;
  padding: 3rem 1rem;
}

.mockup-section h2 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: #111827;
}

.mockup-image {
  width: 100%;
  max-width: 768px;
  height: auto;
  margin: 0 auto;
  display: block;
  border-radius: 1rem;
}

/* Professor Section */
.professor-section {
  background-color: #ffffff;
  padding: 3rem 1rem;
}

.professor-logo {
  height: 7rem;
  width: auto;
  margin-bottom: 2rem;
}

.professor-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: #4b5563;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.trust-badge svg {
  color: var(--accent);
  width: 16px;
  height: 16px;
}

/* Benefits Section */
.benefits-section {
  padding: 3rem 1rem;
}

.benefits-section h2 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.benefit-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  text-align: left;
}

.benefit-card svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
  width: 20px;
  height: 20px;
}

.benefit-card span {
  font-size: 0.875rem;
}

/* Warning Section */
.warning-section {
  background-color: var(--secondary);
  padding: 2rem 1rem;
}

.warning-content {
  max-width: 768px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  color: var(--secondary-foreground);
}

.warning-content svg {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

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

/* Kit Section */
.kit-section {
  padding: 3rem 1rem;
}

.kit-section h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.kit-icons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.kit-icon-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

.kit-icon-circle {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kit-icon-circle svg {
  color: var(--primary-foreground);
  width: 24px;
  height: 24px;
}

.kit-icon-item span {
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

/* Preview Grid */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.preview-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s ease;
}

.preview-item:hover {
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
}

.preview-item img {
  width: 100%;
  height: auto;
  display: block;
}

/* Testimonials Section */
.testimonials-section {
  background-color: #0a0a0a;
  padding: 3rem 1rem;
}

.testimonials-section h2 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.testimonial-item {
  background: #1a1a1a;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s ease;
  aspect-ratio: 9 / 16;
}

.testimonial-item:hover {
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
}

.testimonial-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Problem vs Solution */
.problem-solution-section {
  background: var(--card);
  padding: 3rem 1rem;
}

.problem-solution-section h2 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

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

.problem-box, .solution-box {
  background: #1a1a1a;
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.problem-box {
  border: 1px solid #7f1d1d;
}

.solution-box {
  border: 1px solid #14532d;
}

.box-title {
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.box-title svg {
  width: 20px;
  height: 20px;
}

.problem-box .box-title {
  color: var(--primary);
}

.solution-box .box-title {
  color: var(--accent);
}

.box-list {
  list-style: none;
  text-align: left;
  color: var(--muted-foreground);
}

.box-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.box-list li svg {
  flex-shrink: 0;
  margin-top: 4px;
  width: 16px;
  height: 16px;
}

.problem-box .box-list li svg {
  color: var(--primary);
}

.solution-box .box-list li svg {
  color: var(--accent);
}

/* Pricing Section */
.pricing-section {
  background: #0d1117;
  padding: 3rem 1rem;
}

.pricing-section h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.pricing-section h3 {
  font-size: 1.25rem;
  color: #f5c518;
  margin-bottom: 2rem;
}

.pricing-cards {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.pricing-card {
  background: #0d1520;
  border: 1px solid #1e293b;
  border-radius: 0.75rem;
  padding: 1.5rem;
  max-width: 380px;
  width: 100%;
  display: flex;
  flex-direction: column;
}

.pricing-badge {
  display: inline-block;
  background: #374151;
  color: var(--foreground);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 9999px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.pricing-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.badge-bestseller {
  background: #f5c518;
  color: var(--secondary-foreground);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.badge-bestseller svg {
  width: 12px;
  height: 12px;
}

.badge-popular {
  border: 1px solid var(--muted-foreground);
  color: var(--muted-foreground);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
}

.pricing-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.025em;
  margin-bottom: 1rem;
}

.pricing-subtitle {
  font-size: 1rem;
  font-weight: 700;
  color: #f5c518;
  margin-bottom: 1rem;
}

.price-old {
  color: var(--muted-foreground);
  text-decoration: line-through;
  font-size: 0.875rem;
}

.price-label {
  color: var(--muted-foreground);
  font-size: 0.875rem;
}

.price-current {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0.25rem 0;
}

.price-installment {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  margin-bottom: 1rem;
}

.pricing-features {
  list-style: none;
  text-align: left;
  font-size: 0.875rem;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.pricing-features li svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
  width: 16px;
  height: 16px;
}

/* Guarantee Section */
.guarantee-section {
  background: var(--card);
  padding: 3rem 1rem;
}

.guarantee-box {
  background: #1a1a1a;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 2rem;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.guarantee-icon {
  width: 96px;
  height: 96px;
  background: linear-gradient(to bottom, var(--accent), #16a34a);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 10px 15px -3px rgba(34, 197, 94, 0.3);
  position: relative;
}

.guarantee-icon svg {
  width: 48px;
  height: 48px;
  color: var(--foreground);
}

.guarantee-checkmark {
  position: absolute;
  bottom: -4px;
  right: -4px;
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #1a1a1a;
}

.guarantee-checkmark svg {
  width: 16px;
  height: 16px;
  color: var(--accent-foreground);
}

.guarantee-section h2 {
  font-size: 1.25rem;
  color: #f5c518;
  margin-bottom: 0.5rem;
}

.guarantee-section h3 {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.guarantee-badge {
  display: inline-block;
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

.guarantee-text {
  color: var(--muted-foreground);
  margin-bottom: 1rem;
}

.guarantee-text strong {
  color: var(--foreground);
}

/* FAQ Section */
.faq-section {
  padding: 3rem 1rem;
}

.faq-section h2 {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.faq-list {
  max-width: 768px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--card);
  color: var(--foreground);
  font-weight: 500;
  text-align: left;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

.faq-question:hover {
  background: var(--muted);
}

.faq-question svg {
  color: var(--muted-foreground);
  flex-shrink: 0;
  transition: transform 0.2s ease;
  width: 20px;
  height: 20px;
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-content {
  padding: 1rem;
  background: var(--muted);
  border-top: 1px solid var(--border);
  color: var(--muted-foreground);
  text-align: left;
}

.faq-cta {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  background: var(--card);
  color: var(--foreground);
  font-weight: 500;
  text-align: center;
}

/* Final CTA */
.final-cta {
  background: var(--secondary);
  padding: 3rem 1rem;
}

.final-cta-content {
  max-width: 768px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  color: var(--secondary-foreground);
}

.final-cta-content svg {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.final-cta h2 {
  font-size: 1.125rem;
  font-weight: 700;
}

/* Responsive */
@media (min-width: 640px) {
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .hero-logo {
    height: 12rem;
  }
  
  .professor-logo {
    height: 9rem;
  }
  
  .benefits-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .kit-icons {
    grid-template-columns: repeat(6, 1fr);
  }
  
  .preview-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .problem-solution-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-cards {
    flex-direction: row;
    justify-content: center;
    align-items: stretch;
  }
  
  .warning-content,
  .final-cta-content {
    flex-direction: row;
    text-align: left;
  }
  
  section h2 {
    font-size: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}