/* AnkiTov landing - Modern, professional design with dark mode support */
:root {
  --bg: #f8fafc;
  --bg-secondary: #f1f5f9;
  --ink: #0f172a;
  --ink-secondary: #64748b;
  --accent: #10b981;
  --accent-dark: #059669;
  --accent-light: #6ee7b7;
  --card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow: rgba(15, 23, 42, 0.05);
  --shadow-medium: rgba(15, 23, 42, 0.1);
  --shadow-strong: rgba(15, 23, 42, 0.15);
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --ink: #f1f5f9;
    --ink-secondary: #94a3b8;
    --card: #1e293b;
    --border: #334155;
    --border-light: #1e293b;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.2);
    --shadow-strong: rgba(0, 0, 0, 0.3);
    color-scheme: dark;
  }
}

* { 
  box-sizing: border-box; 
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans Hebrew", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  padding-inline: 1rem;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 80rem;
  margin-inline: auto;
  padding-block: 1.5rem 1rem;
}

.brand { 
  font-weight: 800; 
  font-size: 1.5rem; 
  letter-spacing: -0.02em;
}
.brand-accent { 
  color: var(--accent); 
}

.lang { 
  display: flex; 
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.lang-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink-secondary);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 2.5rem;
}
.lang-btn.is-active { 
  background: var(--accent); 
  border-color: var(--accent); 
  color: #062b1a; 
  font-weight: 600; 
}
.lang-btn:hover:not(.is-active) {
  background: var(--bg-secondary);
  border-color: var(--border-light);
}

/* Main content */
main {
  max-width: 80rem;
  margin-inline: auto;
}

/* Hero section */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding-block: 4rem 3rem;
}

.hero-content h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
}

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

.hero-sub {
  margin: 0 0 2rem;
  font-size: 1.125rem;
  color: var(--ink-secondary);
  max-width: 36rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-primary {
  display: inline-block;
  background: var(--accent);
  color: #062b1a;
  font-weight: 600;
  text-decoration: none;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  box-shadow: 0 4px 6px var(--shadow);
}
.cta-primary:hover {
  background: var(--accent-dark);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px var(--shadow-medium);
}

.cta-secondary {
  display: inline-block;
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}
.cta-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--border-light);
}

/* Hero visual card stack & mock flashcard UI */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

.card-stack {
  position: relative;
  width: 100%;
  max-width: 380px;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-bg-2 {
  position: absolute;
  inset: 0;
  width: 90%;
  height: 94%;
  margin: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transform: rotate(6deg) translateY(12px) translateX(12px);
  opacity: 0.45;
  box-shadow: 0 12px 24px var(--shadow-medium);
  z-index: 1;
  pointer-events: none;
}

.card-bg-1 {
  position: absolute;
  inset: 0;
  width: 95%;
  height: 97%;
  margin: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transform: rotate(-3deg) translateY(6px) translateX(-6px);
  opacity: 0.75;
  box-shadow: 0 16px 28px var(--shadow-medium);
  z-index: 2;
  pointer-events: none;
}

.card-main {
  position: relative;
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 20px 35px var(--shadow-strong);
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-main:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 40px var(--shadow-strong);
}

.fc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.fc-deck-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.625rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink-secondary);
}

.fc-due-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-dark);
  border-radius: 999px;
}

@media (prefers-color-scheme: dark) {
  .fc-due-badge {
    background: rgba(16, 185, 129, 0.25);
    color: var(--accent-light);
  }
}

.fc-body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1rem 1.125rem;
  border: 1px solid var(--border-light);
}

.fc-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-secondary);
  opacity: 0.85;
}

.fc-question {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.fc-divider {
  height: 1px;
  background: var(--border);
  margin-block: 0.25rem;
}

.fc-answer {
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.45;
}

.fc-footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.fc-rating-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-secondary);
}

.fc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.375rem;
}

.fc-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 0.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.fc-btn-time {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.75;
  margin-bottom: 0.1rem;
}

.fc-btn-again:hover {
  background: #fee2e2;
  border-color: #ef4444;
  color: #991b1b;
}

.fc-btn-hard:hover {
  background: #fef3c7;
  border-color: #f59e0b;
  color: #92400e;
}

.fc-btn-good:hover {
  background: #dcfce7;
  border-color: #10b981;
  color: #065f46;
}

.fc-btn-easy:hover {
  background: #e0e7ff;
  border-color: #6366f1;
  color: #3730a3;
}

@media (prefers-color-scheme: dark) {
  .fc-btn-again:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: #ef4444;
    color: #fca5a5;
  }
  .fc-btn-hard:hover {
    background: rgba(245, 158, 11, 0.2);
    border-color: #f59e0b;
    color: #fcd34d;
  }
  .fc-btn-good:hover {
    background: rgba(16, 185, 129, 0.2);
    border-color: #10b981;
    color: #6ee7b7;
  }
  .fc-btn-easy:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: #6366f1;
    color: #a5b4fc;
  }
}

/* Features section */
.features {
  padding-block: 4rem 3rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px var(--shadow);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px var(--shadow-medium);
  border-color: var(--accent-light);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  color: var(--accent-dark);
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.feature-card p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 0.95rem;
}

/* How it works */
.how-it-works {
  padding-block: 3rem;
  text-align: center;
}

.how-it-works h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 3rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 60rem;
  margin: 0 auto;
}

.step {
  position: relative;
  padding: 1.5rem;
}

.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #062b1a;
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
}

.step h3 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.step p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 0.95rem;
}

/* Target audience */
.target-audience {
  padding-block: 4rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin: 3rem 0;
}

.audience-content {
  max-width: 50rem;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
}

.target-audience h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

.target-audience p {
  font-size: 1.125rem;
  color: var(--ink-secondary);
  margin-bottom: 2rem;
}

.audience-benefits {
  text-align: left;
  max-width: 30rem;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.audience-benefits li {
  margin-bottom: 1rem;
  padding-left: 2rem;
  position: relative;
  color: var(--ink-secondary);
}

.audience-benefits li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* Privacy section */
.privacy {
  padding-block: 4rem;
}

.privacy-content {
  max-width: 50rem;
  margin: 0 auto;
  text-align: center;
}

.privacy-content h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

.privacy-statement {
  font-size: 1.125rem;
  color: var(--ink-secondary);
  margin-bottom: 3rem;
}

.privacy-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.privacy-feature h3 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.privacy-feature p {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 0.95rem;
}

/* CTA section */
.cta-section {
  padding-block: 5rem;
  text-align: center;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  border-radius: var(--radius-lg);
  margin: 3rem 0;
  color: #062b1a;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

.cta-primary.large {
  padding: 1.125rem 2.25rem;
  font-size: 1.125rem;
}

/* Footer */
.site-footer {
  max-width: 80rem;
  margin-inline: auto;
  padding-block: 3rem;
  color: var(--ink-secondary);
  font-size: 0.9rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.site-footer p { 
  margin: 0.5rem 0; 
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-note { 
  opacity: 0.75; 
  font-size: 0.8rem; 
}

/* Responsive design */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .privacy-features {
    grid-template-columns: 1fr;
  }
  
  .target-audience,
  .privacy,
  .cta-section {
    padding-block: 2rem;
  }
}

@media (min-width: 1024px) {
  body { 
    padding-inline: 2rem; 
  }
  
  .hero {
    padding-block: 6rem 4rem;
  }
  
  .features {
    padding-block: 5rem 4rem;
  }
  
  .how-it-works {
    padding-block: 4rem;
  }
}