/* ============================================
   WriteFlow AI - Landing Page Styles
   Mobile-First Responsive Design
   ============================================ */

/* === CSS Variables === */
:root {
  --color-primary: #4F46E5;
  --color-primary-dark: #4338CA;
  --color-primary-light: #6366F1;
  --color-secondary: #7C3AED;
  --color-accent: #F59E0B;
  --color-accent-light: #FCD34D;
  --color-success: #10B981;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F9FAFB;
  --color-bg-dark: #F3F4F6;
  --color-text: #111827;
  --color-text-body: #4B5563;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --gradient-primary: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  --gradient-hero: linear-gradient(135deg, #EEF2FF 0%, #F5F3FF 50%, #FDF2F8 100%);
  --gradient-cta: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #EC4899 100%);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --transition: 300ms cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1200px;
  --container-padding: 20px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

ul, ol {
  list-style: none;
}

/* === Utility Classes === */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: 60px 0;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(124, 58, 237, 0.08));
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 600px;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header .section-desc {
  margin: 0 auto;
}

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

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  min-height: 48px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: all var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-logo-icon svg {
  width: 20px;
  height: 20px;
  color: #fff;
}

.nav-links {
  display: none;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-body);
  transition: color var(--transition);
  position: relative;
}

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

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

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

.nav-cta {
  display: none;
}

.nav-cta .btn {
  padding: 10px 22px;
  font-size: 14px;
  min-height: 40px;
}

/* Hamburger */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 24px var(--container-padding);
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-menu-link {
  display: block;
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-body);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  min-height: 48px;
  display: flex;
  align-items: center;
}

.mobile-menu-link:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.mobile-menu-cta {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.mobile-menu-cta .btn {
  width: 100%;
}

/* === Hero Section === */
.hero {
  position: relative;
  padding: 100px 0 60px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(79, 70, 229, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.3); }
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-desc {
  font-size: 16px;
  color: var(--color-text-body);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.hero-trust-stars {
  display: flex;
  gap: 2px;
  color: var(--color-accent);
}

.hero-image {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

/* === Stats Section === */
.stats {
  padding: 40px 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
  padding: 16px 8px;
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 4px;
  font-family: 'Inter', sans-serif;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* === Features Section === */
.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-card {
  position: relative;
  padding: 28px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  border-color: rgba(79, 70, 229, 0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(124, 58, 237, 0.1));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

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

.feature-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* === How It Works === */
.how-it-works {
  background: var(--color-bg-alt);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  font-family: 'Inter', sans-serif;
  position: relative;
  z-index: 2;
}

.step-content {
  flex: 1;
  padding-top: 4px;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* === Use Cases === */
.use-cases {
  background: var(--color-bg);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.use-case-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.use-case-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.use-case-content {
  padding: 20px;
}

.use-case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(124, 58, 237, 0.08));
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.use-case-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.use-case-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* === Testimonials === */
.testimonials {
  background: var(--color-bg-alt);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.testimonial-card {
  padding: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}

.testimonial-stars {
  display: flex;
  gap: 3px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 14px;
  color: var(--color-text-body);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
}

.testimonial-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-role {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* === Pricing === */
.pricing {
  background: var(--color-bg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.pricing-card {
  padding: 28px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--color-primary);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.pricing-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.pricing-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
}

.pricing-currency {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.pricing-amount {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-text);
  font-family: 'Inter', sans-serif;
  line-height: 1;
}

.pricing-period {
  font-size: 14px;
  color: var(--color-text-muted);
}

.pricing-features {
  margin-bottom: 24px;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--color-text-body);
}

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

.pricing-card .btn {
  width: 100%;
}

/* === FAQ === */
.faq {
  background: var(--color-bg-alt);
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: var(--color-bg);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: rgba(79, 70, 229, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  min-height: 56px;
  cursor: pointer;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 400ms ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* === CTA Section === */
.cta-section {
  position: relative;
  padding: 80px 0;
  background: var(--gradient-cta);
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.cta-title {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.3;
}

.cta-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.cta-actions .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.cta-actions .btn-primary:hover {
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* === Footer === */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
}

.footer-copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-legal {
  display: flex;
  gap: 16px;
}

.footer-legal a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* === Scroll Animations === */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 500ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 80ms; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 160ms; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 240ms; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 320ms; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 400ms; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* === Tablet (>= 640px) === */
@media (min-width: 640px) {
  :root {
    --container-padding: 32px;
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 32px;
  }

  .hero {
    padding: 120px 0 80px;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .stat-number {
    font-size: 32px;
  }

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

  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .cta-title {
    font-size: 32px;
  }

  .cta-actions {
    flex-direction: row;
    justify-content: center;
  }

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

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* === Desktop (>= 1024px) === */
@media (min-width: 1024px) {
  :root {
    --container-padding: 40px;
  }

  .section {
    padding: 100px 0;
  }

  .section-title {
    font-size: 36px;
  }

  .section-desc {
    font-size: 16px;
  }

  .nav-links {
    display: flex;
  }

  .nav-cta {
    display: block;
  }

  .nav-hamburger {
    display: none;
  }

  .hero {
    padding: 140px 0 100px;
  }

  .hero-title {
    font-size: 48px;
  }

  .hero-desc {
    font-size: 18px;
  }

  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .steps {
    flex-direction: row;
    gap: 40px;
  }

  .step {
    flex: 1;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 16px;
  }

  .use-cases-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 960px;
    margin: 0 auto;
  }

  .cta-title {
    font-size: 36px;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

/* ============================================
   Modal Overlay
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-container {
  position: relative;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-container {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-text-muted);
  transition: all var(--transition);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}

.modal-close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.modal-body {
  padding: 20px 24px 24px;
}

/* === Modal Form Styles === */
.modal-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  min-height: 48px;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-light);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
  line-height: 1.6;
}

.form-hint {
  font-size: 12px;
  color: var(--color-text-muted);
}

.form-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-muted);
  font-size: 13px;
}

.form-divider::before,
.form-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.modal-switch {
  text-align: center;
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.modal-switch a {
  color: var(--color-primary);
  font-weight: 600;
  cursor: pointer;
}

.modal-switch a:hover {
  text-decoration: underline;
}

/* === Demo Modal === */
.demo-modal .modal-container {
  max-width: 640px;
}

.demo-input-area {
  margin-bottom: 16px;
}

.demo-input-area .form-textarea {
  min-height: 70px;
}

.demo-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.demo-tag {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
  color: var(--color-text-body);
  background: var(--color-bg);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.demo-tag:hover,
.demo-tag.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(79, 70, 229, 0.05);
}

.demo-output {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  min-height: 160px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-body);
  position: relative;
}

.demo-output-placeholder {
  color: var(--color-text-light);
  font-style: italic;
}

.demo-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--color-primary);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.demo-output-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

/* === Contact Modal === */
.contact-modal .modal-container {
  max-width: 520px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
  padding: 16px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(124, 58, 237, 0.05));
  border-radius: var(--radius-md);
  border: 1px solid rgba(79, 70, 229, 0.1);
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-body);
}

.contact-info-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* === Legal Modal === */
.legal-modal .modal-container {
  max-width: 640px;
}

.legal-content {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-body);
}

.legal-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 20px 0 8px;
}

.legal-content h3:first-child {
  margin-top: 0;
}

.legal-content p {
  margin-bottom: 12px;
}

.legal-content ul {
  margin: 8px 0 12px 20px;
  list-style: disc;
}

.legal-content ul li {
  margin-bottom: 4px;
}

/* === Toast Notification === */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  pointer-events: auto;
  transform: translateX(120%);
  transition: transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 360px;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left: 3px solid var(--color-success);
}

.toast.success .toast-icon {
  color: var(--color-success);
}

.toast.error {
  border-left: 3px solid #EF4444;
}

.toast.error .toast-icon {
  color: #EF4444;
}

.toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

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

/* === Back to Top Button === */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 900;
  width: 44px;
  height: 44px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  color: var(--color-text-body);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* === Mobile Modal Adjustments === */
@media (max-width: 639px) {
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }

  .modal-container {
    max-height: 85vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .demo-controls {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .demo-tag {
    flex-shrink: 0;
  }

  .toast-container {
    left: 20px;
    right: 20px;
  }

  .toast {
    max-width: 100%;
  }
}}