/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --primary: #8a2be2;
  --primary-light: #a855f7;
  --primary-dark: #6d28d9;
  --accent-gold: #f59e0b;
  --bg-dark: #0a0a0f;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --text-primary: #f1f1f1;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(138, 43, 226, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s ease;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #c084fc;
}

/* ===========================
   Background Gradient Mesh
   =========================== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(138, 43, 226, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

/* ===========================
   Floating Physics Elements
   =========================== */
.physics-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.physics-symbol {
  position: absolute;
  font-family: 'Georgia', 'Times New Roman', serif;
  font-style: italic;
  color: rgba(138, 43, 226, 0.18);
  font-size: clamp(1rem, 2.2vw, 1.4rem);
  animation: floatSymbol 20s ease-in-out infinite;
  user-select: none;
  white-space: nowrap;
}

.physics-graphic {
  position: absolute;
  color: rgba(138, 43, 226, 0.17);
  animation: floatGraphic 22s ease-in-out infinite;
  user-select: none;
}

.physics-graphic--wave {
  animation: floatWave 18s ease-in-out infinite;
}

@keyframes floatSymbol {
  0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.6; }
  25%      { transform: translateY(-14px) rotate(1.5deg); opacity: 1; }
  50%      { transform: translateY(-6px) rotate(-0.5deg); opacity: 0.7; }
  75%      { transform: translateY(-18px) rotate(1deg); opacity: 0.9; }
}

@keyframes floatGraphic {
  0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.5; }
  25%      { transform: translateY(-12px) rotate(8deg); opacity: 0.85; }
  50%      { transform: translateY(-4px) rotate(-4deg); opacity: 0.6; }
  75%      { transform: translateY(-16px) rotate(6deg); opacity: 0.8; }
}

@keyframes floatWave {
  0%, 100% { transform: translateY(0) scaleX(1); opacity: 0.5; }
  25%      { transform: translateY(-10px) scaleX(1.05); opacity: 0.9; }
  50%      { transform: translateY(-4px) scaleX(0.98); opacity: 0.6; }
  75%      { transform: translateY(-14px) scaleX(1.03); opacity: 0.8; }
}

/* Hide physics decoration on small screens where margins disappear */
@media (max-width: 1024px) {
  .physics-bg {
    display: none;
  }
}

/* ===========================
   Section Utility
   =========================== */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px;
  position: relative;
  z-index: 1;
}

.section-title {
  font-family: 'Yeseva One', serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  text-align: center;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 30%, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 40px;
}

.divider {
  border: none;
  height: 1px;
  max-width: var(--max-width);
  margin: 0 auto;
  background: linear-gradient(90deg, transparent, var(--border-subtle) 30%, var(--border-subtle) 70%, transparent);
}

/* ===========================
   Hero / Pricing Header
   =========================== */
.hero {
  text-align: center;
  padding: 80px 24px 20px;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-family: 'Yeseva One', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 20%, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  display: inline-block;
}

/* Decorative atom orbital around hero heading */
.hero h1::after {
  content: '⚛';
  position: absolute;
  font-size: 0.4em;
  top: -0.3em;
  right: -0.8em;
  -webkit-text-fill-color: var(--primary-light);
  opacity: 0.5;
  animation: atomSpin 6s linear infinite;
}

@keyframes atomSpin {
  0%   { transform: rotate(0deg) scale(1); opacity: 0.4; }
  50%  { transform: rotate(180deg) scale(1.15); opacity: 0.7; }
  100% { transform: rotate(360deg) scale(1); opacity: 0.4; }
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  margin-bottom: 36px;
}

/* ===========================
   Toggle Switch
   =========================== */
.toggle-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin-bottom: 48px;
}

.toggle-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  user-select: none;
}

.toggle-label.active {
  color: var(--text-primary);
}

.toggle {
  position: relative;
  width: 56px;
  height: 30px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

.toggle.annual {
  background: var(--primary);
  border-color: var(--primary);
}

.toggle-switch {
  position: absolute;
  width: 24px;
  height: 24px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 3px;
  transition: left var(--transition-base);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.toggle.annual .toggle-switch {
  left: 28px;
}

.annual-badge {
  background: linear-gradient(135deg, var(--accent-gold), #d97706);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ===========================
   Pricing Cards
   =========================== */
.plan-container {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.plan {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px 32px;
  width: 340px;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  --glow-x: 50%;
  --glow-y: 50%;
}

.plan::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    300px circle at var(--glow-x) var(--glow-y),
    rgba(138, 43, 226, 0.12),
    transparent 60%
  );
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.plan:hover::after {
  opacity: 1;
}

.plan:hover {
  box-shadow:
    var(--shadow-glow),
    0 0 40px rgba(138, 43, 226, 0.1);
  border-color: rgba(138, 43, 226, 0.35);
}

.plan.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.plan.featured::before {
  content: '⭐ Mais Popular';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  z-index: 2;
}

.plan h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan .plan-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.plan .price {
  font-size: 2.6rem;
  font-weight: 700;
  margin: 16px 0 24px;
  letter-spacing: -0.02em;
}

.plan .price span {
  font-size: 0.55em;
  color: var(--text-muted);
  font-weight: 400;
}

.plan ul {
  list-style: none;
  text-align: left;
  margin-bottom: 28px;
}

.plan ul li {
  padding: 8px 0;
  font-size: 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan ul li:last-child {
  border-bottom: none;
}

.plan ul li .icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  margin-top: 2px;
}

.plan ul li.available .icon {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}

.plan ul li.unavailable .icon {
  background: rgba(113, 113, 122, 0.15);
  color: var(--text-muted);
}

.plan ul li.unavailable {
  color: var(--text-muted);
}

/* CTA Button */
.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 12px 36px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(138, 43, 226, 0.35);
  color: #fff;
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--primary-light);
  padding: 12px 36px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--primary);
  transition: background var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ===========================
   Curriculum Section
   =========================== */
.curriculum-container {
  text-align: center;
}

.subject-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}

.subject-tag {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.subject-tag:hover {
  border-color: var(--primary);
  color: var(--text-primary);
  background: rgba(138, 43, 226, 0.08);
}

/* ===========================
   Testimonials
   =========================== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.testimonial-card .quote-icon {
  font-size: 2.4rem;
  color: var(--primary);
  opacity: 0.4;
  line-height: 1;
  margin-bottom: 8px;
}

.testimonial-card .quote-text {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.testimonial-card .quote-author {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary-light);
}

/* ===========================
   FAQ Section
   =========================== */
.faq-container {
  text-align: center;
}

.faq-header p {
  margin-bottom: 10px;
}

.faq-header a {
  color: var(--primary-light);
  text-decoration: underline;
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: left;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(138, 43, 226, 0.25);
  transform: translateY(-2px);
}

.faq-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.faq-item p,
.faq-item ol {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.faq-item ol {
  padding-left: 18px;
}

.faq-item ol li {
  margin-bottom: 4px;
}

.faq-item .link {
  color: var(--primary-light);
}

.faq-item .link:hover {
  text-decoration: underline;
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--border-subtle);
  margin-top: 60px;
  padding: 40px 24px 32px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer .share-heading {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.social-links a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer .contact-link {
  display: inline-block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
  transition: color var(--transition-fast);
}

.footer .contact-link:hover {
  color: var(--primary-light);
}

.footer .rights {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===========================
   Scroll Reveal Animation
   =========================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  .hero {
    padding: 60px 16px 16px;
  }

  .section {
    padding: 40px 16px;
  }

  .plan-container {
    padding: 0 16px;
  }

  .plan {
    width: 100%;
    max-width: 400px;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .testimonial-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .plan .price {
    font-size: 2rem;
  }

  .subject-tags {
    gap: 8px;
  }

  .subject-tag {
    font-size: 0.8rem;
    padding: 6px 14px;
  }
}

/* ===========================
   Reduced Motion
   =========================== */
@media (prefers-reduced-motion: reduce) {
  .physics-symbol,
  .physics-graphic {
    animation: none;
    opacity: 0.5;
  }

  .hero h1::after {
    animation: none;
    opacity: 0.5;
  }

  .reveal {
    transition: none;
    opacity: 1;
    transform: none;
  }
}