/* ── NexTutor Landing Page Styles ─────────────────────────────────── */

/* Design Tokens */
:root {
  --primary: #4343D5;
  --primary-container: #5D5FEF;
  --secondary: #712AE2;
  --secondary-container: #8A4CFC;
  --tertiary: #0056B9;
  --surface: #0D0D1A;
  --surface-container: #141428;
  --surface-elevated: #1C1C36;
  --surface-glass: rgba(93, 95, 239, 0.08);
  --on-surface: #E4E1ED;
  --on-surface-variant: #C7C4D7;
  --on-surface-muted: #908F9F;
  --outline: #464555;
  --gradient-primary: linear-gradient(135deg, #4343D5, #712AE2);
  --gradient-hero: linear-gradient(160deg, #0D0D1A 0%, #1a1245 40%, #0D0D1A 100%);
  --gradient-card: linear-gradient(145deg, rgba(93,95,239,0.12), rgba(113,42,226,0.06));
  --gradient-cta: linear-gradient(135deg, #4343D5, #8A4CFC);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-xl: 40px;
  --shadow-glow: 0 0 60px rgba(67, 67, 213, 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ── Typography ──────────────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

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

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary-container);
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--on-surface-variant);
  max-width: 600px;
  margin: 0 auto;
}

/* ── Layout ──────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
  position: relative;
}

/* ── Navbar ──────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(13, 13, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(93, 95, 239, 0.1);
  padding: 12px 0;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
}

.nav-brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-links a:hover { color: var(--on-surface); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  padding: 10px 24px !important;
  background: var(--gradient-primary) !important;
  border-radius: var(--radius-sm) !important;
  color: #fff !important;
  font-weight: 600 !important;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(67, 67, 213, 0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(67, 67, 213, 0.5);
}

.nav-cta::after { display: none !important; }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Hero Section ────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(67, 67, 213, 0.15), transparent 70%);
  top: -100px;
  right: -100px;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(113, 42, 226, 0.1), transparent 70%);
  bottom: -50px;
  left: -50px;
  pointer-events: none;
}

#hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content { max-width: 580px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--surface-glass);
  border: 1px solid rgba(93, 95, 239, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary-container);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-badge .pulse {
  width: 8px;
  height: 8px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero h1 { margin-bottom: 20px; }

.hero-description {
  font-size: 1.2rem;
  color: var(--on-surface-variant);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  background: var(--gradient-cta);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(67, 67, 213, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(67, 67, 213, 0.6);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  background: transparent;
  color: var(--on-surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--primary-container);
  background: var(--surface-glass);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(93, 95, 239, 0.1);
}

.stat-item h4 {
  font-size: 1.75rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--on-surface-muted);
  margin-top: 4px;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-robot-wrapper {
  position: relative;
  width: 100%;
  max-width: 560px;
  height: 520px;
}

.hero-robot-wrapper canvas {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
}

.hero-glow {
  position: absolute;
  width: 80%;
  height: 80%;
  top: 10%;
  left: 10%;
  background: radial-gradient(circle, rgba(67, 67, 213, 0.25), transparent 60%);
  filter: blur(60px);
  z-index: -1;
}

/* ── Features Section ────────────────────────────────────────────── */
.features { text-align: center; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid rgba(93, 95, 239, 0.1);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  text-align: left;
  transition: var(--transition);
  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: var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(93, 95, 239, 0.25);
  box-shadow: 0 16px 48px rgba(67, 67, 213, 0.15);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-glass);
  border: 1px solid rgba(93, 95, 239, 0.15);
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 { margin-bottom: 12px; }

.feature-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ── How It Works ────────────────────────────────────────────────── */
.how-it-works { text-align: center; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 60px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 48px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-container), var(--secondary), var(--primary-container), transparent);
  opacity: 0.3;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 96px;
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 50%;
  margin: 0 auto 24px;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 8px 32px rgba(67, 67, 213, 0.35);
  position: relative;
}

.step-number::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(93, 95, 239, 0.3);
}

.step h3 { margin-bottom: 8px; }
.step p { color: var(--on-surface-variant); font-size: 0.95rem; }

/* ── Showcase / Screenshots ──────────────────────────────────────── */
.showcase { text-align: center; }

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 60px;
}

.showcase-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.showcase-item:hover { transform: translateY(-8px) scale(1.02); }

.showcase-item img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid rgba(93, 95, 239, 0.15);
  transition: var(--transition);
}

.showcase-item:hover img {
  box-shadow: 0 20px 60px rgba(67, 67, 213, 0.2);
}

.showcase-label {
  margin-top: 16px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--on-surface-variant);
}

/* ── Pricing Section ─────────────────────────────────────────────── */
.pricing { text-align: center; }

.pricing-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 60px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background: var(--gradient-card);
  border: 1px solid rgba(93, 95, 239, 0.1);
  border-radius: var(--radius-md);
  padding: 48px 40px;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

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

.pricing-card.featured::before {
  content: 'BEST VALUE';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 20px;
  background: var(--gradient-primary);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #fff;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(67, 67, 213, 0.2);
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.pricing-card .price {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  margin: 20px 0 8px;
}

.pricing-card .price-currency { font-size: 1.25rem; vertical-align: super; }
.pricing-card .price-period { font-size: 1rem; color: var(--on-surface-muted); font-weight: 400; }

.pricing-card .price-desc {
  color: var(--on-surface-variant);
  margin-bottom: 32px;
  font-size: 0.95rem;
}

.pricing-features {
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}

.pricing-features li::before {
  content: '✓';
  color: #4ade80;
  font-weight: 700;
  font-size: 1rem;
}

/* ── Languages Section ───────────────────────────────────────────── */
.languages { text-align: center; }

.languages-grid {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.language-card {
  background: var(--gradient-card);
  border: 1px solid rgba(93, 95, 239, 0.1);
  border-radius: var(--radius-md);
  padding: 40px 48px;
  text-align: center;
  transition: var(--transition);
  min-width: 200px;
}

.language-card:hover {
  transform: translateY(-8px);
  border-color: rgba(93, 95, 239, 0.25);
  box-shadow: 0 12px 40px rgba(67, 67, 213, 0.15);
}

.language-card .lang-emoji {
  font-size: 3rem;
  margin-bottom: 16px;
}

.language-card h3 { font-size: 1.25rem; }
.language-card p { color: var(--on-surface-variant); font-size: 0.9rem; margin-top: 4px; }

/* ── CTA Section ─────────────────────────────────────────────────── */
.cta-section {
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(67, 67, 213, 0.12), transparent 60%);
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-content h2 { margin-bottom: 16px; }
.cta-content p { margin-bottom: 40px; }

.coming-soon-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: var(--gradient-cta);
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 8px 40px rgba(67, 67, 213, 0.4);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 8px 40px rgba(67, 67, 213, 0.4); }
  50% { box-shadow: 0 8px 60px rgba(67, 67, 213, 0.6); }
}

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid rgba(93, 95, 239, 0.1);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
}

.footer-brand img { width: 32px; height: 32px; border-radius: 8px; }

.footer-links { display: flex; gap: 24px; }
.footer-links a {
  color: var(--on-surface-muted);
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--on-surface); }

.footer-copy {
  width: 100%;
  text-align: center;
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px solid rgba(93, 95, 239, 0.06);
  color: var(--on-surface-muted);
  font-size: 0.85rem;
}

/* ── Scroll Animations ───────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { margin-top: 40px; }
  .hero-robot-wrapper { max-width: 360px; height: 400px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid .showcase-item:last-child { grid-column: span 2; max-width: 50%; margin: 0 auto; }
}

@media (max-width: 768px) {
  section { padding: 80px 0; }
  .nav-links { display: none; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(13, 13, 26, 0.97);
    backdrop-filter: blur(20px);
    justify-content: center;
    align-items: center;
    gap: 24px;
    z-index: 999;
  }
  .nav-links.active a { font-size: 1.25rem; }
  .mobile-menu-btn { display: flex; z-index: 1001; }
  .features-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .steps::before { display: none; }
  .showcase-grid { grid-template-columns: 1fr; max-width: 360px; margin-left: auto; margin-right: auto; }
  .showcase-grid .showcase-item:last-child { grid-column: auto; max-width: 100%; }
  .pricing-cards { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-primary, .btn-secondary { justify-content: center; }
  .pricing-card { padding: 32px 24px; }
}