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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #000000;
  color: #ffffff;
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.98);
  border-bottom-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  transition: all 0.3s ease;
}

.nav-logo:hover {
  transform: translateY(-2px);
}

.logo-icon {
  font-size: 2rem;
}

.logo-text {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #ffffff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-nav {
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 8rem 2rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.15), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.15), transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(16, 185, 129, 0.1), transparent 40%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 1100px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 2rem;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease;
}

.badge-text {
  color: #60a5fa;
  font-weight: 600;
  font-size: 0.9rem;
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.gradient-text {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 800px;
  margin: 0 auto 3rem;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-bottom: 4rem;
  animation: fadeInUp 0.8s ease 0.6s backwards;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 4rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  animation: fadeInUp 0.8s ease 0.8s backwards;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

/* Trust Section */
.trust-section {
  padding: 3rem 0;
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.trust-title {
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.trust-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.trust-logo {
  color: rgba(255, 255, 255, 0.4);
  font-size: 1.5rem;
  font-weight: 700;
  transition: all 0.3s ease;
}

.trust-logo:hover {
  color: rgba(255, 255, 255, 0.8);
  transform: scale(1.1);
}

/* Section Styles */
section {
  padding: 6rem 0;
}

.section-title {
  font-size: 3rem;
  font-weight: 900;
  text-align: center;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff, rgba(255, 255, 255, 0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.25rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  max-width: 800px;
  margin: 0 auto 4rem;
  line-height: 1.8;
}

/* Problem Section */
.problem-section {
  background: 
    radial-gradient(circle at 80% 20%, rgba(239, 68, 68, 0.1), transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(249, 115, 22, 0.1), transparent 40%);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.problem-card {
  padding: 2.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  transition: all 0.3s ease;
}

.problem-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(239, 68, 68, 0.3);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(239, 68, 68, 0.2);
}

.problem-stat {
  font-size: 3.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, #ef4444, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.problem-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.problem-text {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
}

/* Testimonials Section - Interface.ai Style */
.testimonials-section {
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.testimonial-card {
  padding: 2.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  transition: all 0.3s ease;
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  font-size: 4rem;
  color: rgba(59, 130, 246, 0.2);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.15);
}

.testimonial-content {
  margin-bottom: 2rem;
}

.testimonial-text {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.05rem;
  line-height: 1.8;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.author-name {
  font-weight: 700;
  color: #ffffff;
  font-size: 1rem;
}

.author-title {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* Solutions Section */
.solutions-section {
  background: 
    radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.1), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1), transparent 50%);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 3rem;
  margin-top: 3rem;
}

.solution-card {
  padding: 3rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.5rem;
  transition: all 0.3s ease;
}

.solution-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
}

.solution-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.solution-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.solution-text {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.solution-features {
  list-style: none;
  margin-bottom: 2rem;
}

.solution-features li {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
  line-height: 1.6;
}

/* Features Section */
.features-section {
  background: rgba(255, 255, 255, 0.02);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.feature-card {
  padding: 3rem 2.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-5px);
}

.feature-number {
  font-size: 3rem;
  font-weight: 900;
  color: rgba(59, 130, 246, 0.2);
  margin-bottom: 1.5rem;
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: #ffffff;
}

.feature-text {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

/* Categories Section */
.categories-section {
  background: 
    radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.08), transparent 50%);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.category-card {
  padding: 2.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  transition: all 0.3s ease;
  text-align: center;
}

.category-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(16, 185, 129, 0.3);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.15);
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.category-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.category-desc {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.category-count {
  color: rgba(16, 185, 129, 0.8);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* CTA Section */
.cta-section {
  padding: 8rem 0;
  background: 
    radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15), transparent 60%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15), transparent 50%);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.cta-title {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 3rem;
  line-height: 1.8;
}

.cta-buttons {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-text {
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-heading {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #ffffff;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: all 0.3s ease;
}

.footer-links a:hover {
  color: #3b82f6;
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Registration Forms Section */
.signup-section {
  padding: 8rem 0;
  background: #000000;
  position: relative;
}

.signup-header {
  text-align: center;
  margin-bottom: 4rem;
}

/* Tab Navigation */
.form-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin: 0 auto 3rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.15);
  max-width: 800px;
}

.tab-button {
  flex: 1;
  padding: 1.5rem 2.5rem;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: rgba(255, 255, 255, 0.5);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-family: 'Inter', sans-serif;
  position: relative;
}

.tab-button:hover {
  color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.02);
}

.tab-button.active {
  color: #3b82f6;
  border-bottom-color: #3b82f6;
  background: rgba(59, 130, 246, 0.05);
}

.tab-icon {
  font-size: 1.75rem;
}

.tab-label {
  font-size: 1.1rem;
}

/* Forms Container */
.forms-container {
  max-width: 1200px;
  margin: 0 auto;
}

.form-content {
  display: none;
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Form Structure */
.registration-form {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1.5rem;
  padding: 4rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.form-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem;
  margin-bottom: 2rem;
}

.form-column {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.form-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.section-heading {
  font-size: 0.95rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 0.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.form-row {
  display: flex;
  flex-direction: column;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.form-group label {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 0.5rem;
  color: #ffffff;
  font-size: 1rem;
  transition: all 0.3s ease;
  font-family: 'Inter', sans-serif;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(59, 130, 246, 0.6);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 3rem;
}

.form-group select option {
  background: #0a0a0a;
  color: #ffffff;
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.6;
}

.field-hint {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  font-style: italic;
  margin-top: -0.25rem;
}

/* Form Actions */
.form-actions {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: center;
}

.btn-large {
  padding: 1.25rem 3.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  border-radius: 0.75rem;
}

/* Form validation states */
.form-group input:invalid:not(:placeholder-shown),
.form-group select:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
  border-color: rgba(239, 68, 68, 0.6);
}

.form-group input:valid:not(:placeholder-shown),
.form-group select:valid:not(:placeholder-shown),
.form-group textarea:valid:not(:placeholder-shown) {
  border-color: rgba(16, 185, 129, 0.6);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .form-columns {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .registration-form {
    padding: 3rem;
  }
  
  .tab-button {
    padding: 1.25rem 2rem;
    font-size: 1rem;
  }
  
  .tab-icon {
    font-size: 1.5rem;
  }
}

@media (max-width: 640px) {
  .registration-form {
    padding: 2rem;
  }
  
  .form-columns {
    gap: 2rem;
  }
  
  .form-column {
    gap: 2rem;
  }
  
  .tab-button {
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.25rem 1rem;
  }
  
  .tab-label {
    font-size: 0.9rem;
  }
  
  .form-tabs {
    flex-direction: row;
    border-bottom: 2px solid rgba(255, 255, 255, 0.15);
  }
  
  .tab-button {
    border-bottom: 3px solid transparent;
    border-left: none;
  }
  
  .tab-button.active {
    border-bottom-color: #3b82f6;
    border-left: none;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 2rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .solutions-grid,
  .problem-grid,
  .categories-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-menu {
    display: none;
  }
  
  .signup-section {
    padding: 4rem 0;
  }
  
  .signup-header {
    margin-bottom: 2.5rem;
  }
  
  .form-tabs {
    max-width: 100%;
  }
}