/* ==========================================================================
   CSE ALLY — COMPONENTS & SECTIONS (CSS)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Navbar
   -------------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(248, 250, 252, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-normal);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-brand img {
  height: 42px;
  width: auto;
  border-radius: var(--radius-sm);
}

.navbar-brand-text {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.navbar-brand-text span {
  color: var(--color-accent);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   2. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  overflow: hidden;
  padding-top: 60px;
  padding-bottom: 90px;
  background: radial-gradient(circle at 80% 20%, rgba(255, 159, 28, 0.08) 0%, transparent 40%),
              radial-gradient(circle at 10% 40%, rgba(15, 50, 119, 0.06) 0%, transparent 50%),
              var(--bg-page);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: #FFFFFF;
  border: 1px solid rgba(15, 50, 119, 0.12);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.hero-pill-badge {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  color: #FFFFFF;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 4.2vw, 3.65rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1E40AF 50%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 36px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-social-proof {
  display: flex;
  align-items: center;
  gap: 16px;
}

.avatar-stack {
  display: flex;
  align-items: center;
}

.avatar-stack img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 2px solid #FFFFFF;
  margin-left: -8px;
  object-fit: cover;
  background-color: #E2E8F0;
}

.avatar-stack img:first-child {
  margin-left: 0;
}

.proof-text {
  font-size: 0.85rem;
  color: var(--text-soft);
  line-height: 1.35;
}

.proof-stars {
  color: #F59E0B;
  display: flex;
  gap: 2px;
  margin-bottom: 2px;
}

/* Hero Phone Image Showcase */
.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.hero-phone-img {
  max-width: 440px;
  width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 25px 45px rgba(15, 50, 119, 0.16));
  transition: transform var(--transition-normal);
}

.hero-phone-img:hover {
  transform: translateY(-4px) scale(1.01);
}

@media (max-width: 1024px) {
  .hero-phone-img {
    max-width: 380px;
  }
}

@media (max-width: 640px) {
  .hero-phone-img {
    max-width: 300px;
  }
}

/* --------------------------------------------------------------------------
   3. Interactive Sample Quiz Teaser
   -------------------------------------------------------------------------- */
.quiz-teaser-section {
  background: #FFFFFF;
  border-top: 1px solid var(--border-card);
  border-bottom: 1px solid var(--border-card);
}

.quiz-box {
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-width: 820px;
  margin: 0 auto;
}

.quiz-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  background-color: #0A173B;
  color: #FFFFFF;
}

.quiz-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-accent);
}

.quiz-timer-sim {
  font-family: monospace;
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.quiz-content {
  padding: 36px 32px;
}

.quiz-question-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 24px;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.quiz-opt-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 14px 20px;
  text-align: left;
  background: #FFFFFF;
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.quiz-opt-btn:hover {
  border-color: var(--color-primary-light);
  background-color: #F8FAFC;
}

.quiz-opt-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background-color: #F1F5F9;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}

.quiz-opt-btn.selected {
  border-color: var(--color-primary);
  background-color: rgba(15, 50, 119, 0.05);
}

.quiz-opt-btn.selected .quiz-opt-letter {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.quiz-opt-btn.correct {
  border-color: var(--color-success);
  background-color: var(--color-success-soft);
  color: #065F46;
}

.quiz-opt-btn.correct .quiz-opt-letter {
  background-color: var(--color-success);
  color: #FFFFFF;
}

.quiz-opt-btn.incorrect {
  border-color: var(--color-danger);
  background-color: rgba(239, 68, 68, 0.08);
  color: #991B1B;
}

.quiz-opt-btn.incorrect .quiz-opt-letter {
  background-color: var(--color-danger);
  color: #FFFFFF;
}

/* AI Solution Box */
.ai-solution-box {
  display: none;
  background: linear-gradient(135deg, #0B1938 0%, #060E22 100%);
  color: #F8FAFC;
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid rgba(255, 159, 28, 0.25);
  box-shadow: 0 12px 30px rgba(10, 23, 59, 0.25);
  animation: fadeIn 0.3s ease;
}

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

.ai-solution-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ai-solution-identity {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ai-solution-identity h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-accent);
}

.ai-lang-tabs {
  display: flex;
  gap: 6px;
  background: rgba(255, 255, 255, 0.1);
  padding: 3px;
  border-radius: var(--radius-full);
}

.ai-tab-btn {
  background: none;
  border: none;
  color: #94A3B8;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ai-tab-btn.active {
  background-color: var(--color-accent);
  color: #0A1128;
}

.ai-explanation-body {
  font-size: 0.95rem;
  line-height: 1.6;
  color: #E2E8F0;
}

/* --------------------------------------------------------------------------
   4. Features Grid
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.feature-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(15, 50, 119, 0.2);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-icon-wrapper.blue {
  background-color: rgba(15, 50, 119, 0.08);
  color: var(--color-primary);
}

.feature-icon-wrapper.gold {
  background-color: rgba(255, 159, 28, 0.12);
  color: #D97706;
}

.feature-icon-wrapper.cyan {
  background-color: rgba(0, 180, 216, 0.12);
  color: #0284C7;
}

.feature-icon-wrapper.green {
  background-color: var(--color-success-soft);
  color: var(--color-success);
}

.feature-card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

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

/* --------------------------------------------------------------------------
   5. Subjects Breakdown
   -------------------------------------------------------------------------- */
.subjects-section {
  background-color: var(--dark-bg);
  color: var(--dark-text);
}

.subjects-section .section-title {
  color: #FFFFFF;
}

.subjects-section .section-subtitle {
  color: var(--dark-muted);
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.subject-card {
  background-color: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
}

.subject-card:hover {
  background-color: var(--dark-card);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
}

.subject-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.subject-pill {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-accent);
}

.subject-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #FFFFFF;
}

.subject-desc {
  font-size: 0.88rem;
  color: var(--dark-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   6. Pricing Plans
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

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

.pricing-card.featured {
  border-color: var(--color-accent);
  box-shadow: 0 20px 35px -5px rgba(255, 159, 28, 0.2);
  background: linear-gradient(180deg, #FFFFFF 0%, #FFFDF9 100%);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  color: #FFFFFF;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 4px 10px rgba(255, 159, 28, 0.4);
}

.plan-name {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 44px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-card);
}

.plan-price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.plan-price-amount {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-main);
  line-height: 1;
}

.plan-price-period {
  font-size: 0.9rem;
  color: var(--text-soft);
  font-weight: 500;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.plan-feature-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-success);
}

.plan-feature-item.disabled {
  color: var(--text-light);
}

.plan-feature-item.disabled svg {
  color: var(--text-light);
}

/* --------------------------------------------------------------------------
   7. Testimonials
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.testimonial-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.testimonial-quote {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background-color: #E2E8F0;
}

.author-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-main);
}

.author-role {
  font-size: 0.82rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   8. FAQ Accordion
   -------------------------------------------------------------------------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background-color: #FFFFFF;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active {
  border-color: rgba(15, 50, 119, 0.3);
  box-shadow: var(--shadow-md);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 22px 26px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  gap: 16px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--color-primary);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  color: var(--text-muted);
  line-height: 1.65;
  font-size: 0.98rem;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 24px;
}

/* --------------------------------------------------------------------------
   9. Download Banner Section
   -------------------------------------------------------------------------- */
.download-banner {
  background: linear-gradient(135deg, #0A1B44 0%, #0F3277 60%, #1A4AB0 100%);
  color: #FFFFFF;
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.download-banner-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.download-banner-sub {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin: 0 auto 36px auto;
}

.download-banner-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   10. Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: #070D1E;
  color: #94A3B8;
  padding-top: 72px;
  padding-bottom: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFFFFF;
}

.footer-brand-title span {
  color: var(--color-accent);
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 320px;
  margin-bottom: 20px;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.9rem;
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
}

.footer-disclaimer {
  max-width: 600px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: #64748B;
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   11. Legal Document Styles (Privacy & Terms)
   -------------------------------------------------------------------------- */
.legal-page {
  padding-top: 60px;
  padding-bottom: 96px;
  background-color: #FFFFFF;
}

.legal-header {
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 32px;
  margin-bottom: 40px;
}

.legal-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.legal-meta {
  font-size: 0.9rem;
  color: var(--text-soft);
}

.legal-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #334155;
}

.legal-body h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #E2E8F0;
}

.legal-body h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 24px;
  margin-bottom: 12px;
}

.legal-body p {
  margin-bottom: 18px;
}

.legal-body ul, .legal-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.legal-body li {
  margin-bottom: 8px;
}

/* --------------------------------------------------------------------------
   12. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-social-proof {
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .navbar-nav, .navbar-actions .btn {
    display: none;
  }

  .nav-toggle-btn {
    display: block;
  }

  .mobile-menu.open {
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--border-card);
  }

  .floating-badge {
    display: none;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}