/* ========================================
   Vhh — Smart Todo List App
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --primary: #6C3AED;
  --primary-dark: #5B21B6;
  --primary-light: #8B5CF6;
  --accent: #F97316;
  --accent-dark: #EA580C;
  --background: #FAFAF9;
  --surface: #FFFFFF;
  --surface-alt: #F5F5F0;
  --text-primary: #1C1917;
  --text-secondary: #57534E;
  --text-muted: #A8A29E;
  --border: #E7E5E4;
  --border-light: #F0EFED;
  --success: #10B981;
  --danger: #EF4444;
  --gradient-primary: linear-gradient(135deg, #6C3AED 0%, #8B5CF6 50%, #A78BFA 100%);
  --gradient-accent: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
  --gradient-hero: linear-gradient(160deg, #FAFAF9 0%, #F0EDFF 40%, #FFF7ED 100%);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  /* Spacing */
  --section-padding: 100px;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.06);
  --shadow-glow: 0 0 40px rgba(108, 58, 237, 0.15);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--background);
  overflow-x: hidden;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(108, 58, 237, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108, 58, 237, 0.45);
}

.btn-accent {
  background: var(--gradient-accent);
  color: white;
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 16px;
}

.btn-ghost:hover {
  color: var(--primary);
  background: rgba(108, 58, 237, 0.06);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-full {
  width: 100%;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all 0.3s ease;
}

.nav.scrolled {
  background: rgba(250, 250, 249, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: 12px 0;
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  color: var(--text-primary);
}

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

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 14px;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.nav-mobile a, .nav-mobile .btn {
  padding: 12px 16px;
  font-size: 16px;
  text-align: center;
  border-radius: var(--radius-md);
}

.nav-mobile a:hover {
  background: var(--surface-alt);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
}

.hero-blob-1 {
  width: 500px;
  height: 500px;
  background: rgba(108, 58, 237, 0.15);
  top: -100px;
  right: -100px;
}

.hero-blob-2 {
  width: 400px;
  height: 400px;
  background: rgba(249, 115, 22, 0.1);
  bottom: -50px;
  left: -100px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.4;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.hero-title {
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.1s forwards;
}

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

.hero-subtitle {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.2s forwards;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.3s forwards;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.4s forwards;
}

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

.hero-stat-num {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
}

.hero-stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* --- Logos Bar --- */
.logos-bar {
  padding: 60px 0;
  border-bottom: 1px solid var(--border-light);
  background: var(--surface);
}

.logos-label {
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.logos-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.logo-item {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-muted);
  opacity: 0.5;
  transition: opacity 0.3s;
}

.logo-item:hover {
  opacity: 0.8;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(108, 58, 237, 0.08);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Features --- */
.features {
  padding: var(--section-padding) 0;
  background: var(--background);
}

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

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108, 58, 237, 0.08);
  border-radius: var(--radius-md);
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- Process --- */
.process {
  padding: var(--section-padding) 0;
  background: var(--surface-alt);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: var(--border);
}

.process-step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 50%;
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  position: relative;
  z-index: 1;
}

.step-content h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 280px;
  margin: 0 auto;
}

/* --- App Section --- */
.app-section {
  padding: var(--section-padding) 0;
  background: var(--background);
}

.app-container {
  max-width: 680px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  background: var(--surface-alt);
}

.app-filters {
  display: flex;
  gap: 4px;
}

.filter-btn {
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-heading);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover {
  color: var(--text-primary);
  background: rgba(0,0,0,0.04);
}

.filter-btn.active {
  background: var(--primary);
  color: white;
}

.app-count {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.app-input-row {
  display: flex;
  gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
}

.app-input-row input {
  flex: 1;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-body);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s;
}

.app-input-row input:focus {
  border-color: var(--primary);
}

.task-list {
  list-style: none;
  max-height: 400px;
  overflow-y: auto;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-light);
  transition: all 0.2s;
  animation: slideIn 0.3s ease;
}

.task-item:hover {
  background: var(--surface-alt);
}

.task-item:last-child {
  border-bottom: none;
}

.task-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.task-checkbox:hover {
  border-color: var(--primary);
}

.task-checkbox.checked {
  background: var(--success);
  border-color: var(--success);
}

.task-checkbox.checked::after {
  content: '✓';
  color: white;
  font-size: 12px;
  font-weight: 700;
}

.task-text {
  flex: 1;
  font-size: 15px;
  color: var(--text-primary);
  transition: all 0.2s;
}

.task-text.completed {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-delete {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: all 0.2s;
}

.task-item:hover .task-delete {
  opacity: 1;
}

.task-delete:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-top: 1px solid var(--border-light);
  background: var(--surface-alt);
}

.app-footer span {
  font-size: 13px;
  color: var(--text-muted);
}

.app-empty {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
  color: var(--text-muted);
}

.app-empty p {
  margin-top: 16px;
  font-size: 15px;
}

.app-empty.visible {
  display: flex;
}

/* --- Testimonials --- */
.testimonials {
  padding: var(--section-padding) 0;
  background: var(--surface);
}

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

.testimonial-card {
  background: var(--background);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s;
}

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

.testimonial-stars {
  color: #FBBF24;
  font-size: 18px;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-card > p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

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

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.testimonial-author strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
}

.testimonial-author span {
  font-size: 13px;
  color: var(--text-muted);
}

/* --- FAQ --- */
.faq {
  padding: var(--section-padding) 0;
  background: var(--background);
}

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

.faq-item {
  border-bottom: 1px solid var(--border-light);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  background: none;
  border: none;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  transition: color 0.2s;
}

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

.faq-question svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.open .faq-question svg {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- CTA Section --- */
.cta-section {
  padding: var(--section-padding) 0;
  background: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  background: rgba(108, 58, 237, 0.2);
  border-radius: 50%;
  filter: blur(100px);
}

.cta-content {
  text-align: center;
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  color: white;
  margin-bottom: 16px;
}

.cta-content > p {
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto 16px;
}

.cta-form input {
  flex: 1;
  padding: 14px 20px;
  font-size: 15px;
  font-family: var(--font-body);
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.08);
  color: white;
  outline: none;
  transition: border-color 0.2s;
}

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

.cta-form input:focus {
  border-color: var(--primary-light);
}

.cta-note {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* --- Footer --- */
.footer {
  padding: 80px 0 40px;
  background: #0C0A09;
  color: rgba(255,255,255,0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand .nav-logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 280px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.5);
  transition: all 0.2s;
}

.footer-social a:hover {
  background: var(--primary);
  color: white;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: white;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  font-size: 13px;
}

/* --- Auth Modal --- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 440px;
  width: 100%;
  position: relative;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.3s ease;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.2s;
}

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

.modal-header {
  text-align: center;
  margin-bottom: 28px;
}

.modal-header h2 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
}

.modal-header p {
  font-size: 15px;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-body);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--primary);
}

.auth-switch {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

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

.auth-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
}

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

.auth-divider span {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* --- Keyframes --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }

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

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

  .testimonials-grid .testimonial-card:last-child {
    grid-column: span 2;
    max-width: 500px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
  }

  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-mobile.open {
    display: flex;
  }

  .nav-actions .btn {
    display: none;
  }

  .nav-actions .nav-user {
    display: none;
  }

  .nav-actions .nav-user.mobile-visible {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 60px;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stat-num {
    font-size: 24px;
  }

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

  .process-steps {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .process-steps::before {
    display: none;
  }

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

  .testimonials-grid .testimonial-card:last-child {
    grid-column: span 1;
    max-width: none;
  }

  .app-input-row {
    flex-direction: column;
  }

  .cta-form {
    flex-direction: column;
  }

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

  .footer-brand {
    grid-column: span 1;
  }

  .modal {
    padding: 28px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .logos-grid {
    gap: 24px;
  }

  .logo-item {
    font-size: 15px;
  }
}