/**
 * Landing Page Styles
 * Public-facing landing page for TubeMate
 */

/* ========== Page Layout ========== */
.landing-page {
  min-height: 100vh;
  background: var(--color-background);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  overflow-x: hidden;
}

/* ========== Navbar ========== */
.landing-nav {
  height: 72px;
  padding: 0 var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.landing-nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}

.landing-nav-brand img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
}

.landing-nav-brand span {
  font-size: 1.2rem;
  font-weight: 700;
}

.landing-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.landing-nav-links a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.landing-nav-cta {
  background: var(--color-primary);
  color: var(--color-white) !important;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-lg);
  font-weight: 600 !important;
  transition: background var(--transition-fast) !important;
}

.landing-nav-cta:hover {
  background: var(--color-primary-dark) !important;
  color: var(--color-white) !important;
}

/* Theme Toggle */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border-light, transparent);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.theme-toggle-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

/* Show sun in dark mode, moon in light mode */
[data-theme="light"] .theme-icon-sun,
:root:not([data-theme="dark"]) .theme-icon-sun { display: none; }
[data-theme="light"] .theme-icon-moon,
:root:not([data-theme="dark"]) .theme-icon-moon { display: block; }
[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="dark"] .theme-icon-moon { display: none; }

/* ========== Hero Section ========== */
.landing-hero {
  padding: 80px var(--space-8) 64px;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.landing-hero-content {
  max-width: 560px;
}

.landing-hero h1 {
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  margin: 0 0 var(--space-4);
}

.landing-hero-sub {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 0 var(--space-8);
}

/* URL Input Block */
.landing-input-group {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.landing-url-input {
  flex: 1;
  height: 56px;
  padding: 0 var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
}

.landing-url-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.landing-url-input::placeholder {
  color: var(--color-text-tertiary);
}

.landing-submit-btn {
  height: 56px;
  padding: 0 var(--space-6);
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast);
}

.landing-submit-btn:hover {
  background: var(--color-primary-dark);
}

.landing-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.landing-submit-btn .btn-spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.landing-submit-btn.loading .btn-text {
  display: none;
}

.landing-submit-btn.loading .btn-spinner {
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.landing-secondary-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-fast);
}

.landing-secondary-cta:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.landing-trust-note {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
}

/* Error message */
.landing-error {
  color: var(--color-danger);
  font-size: 0.875rem;
  margin-top: var(--space-2);
  display: none;
}

.landing-error.visible {
  display: block;
}

/* ========== Preview Card ========== */
.landing-preview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
}

.landing-preview-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.landing-preview-label .dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
}

.landing-preview-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-5);
}

.landing-preview-bullets li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-text);
}

.landing-preview-bullets li .bullet-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  color: var(--color-primary);
}

.landing-preview-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.landing-preview-actions .btn-copy {
  width: 100%;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.landing-preview-actions .btn-copy:hover {
  background: var(--color-primary-dark);
}

.landing-preview-actions .btn-followup {
  width: 100%;
  height: 44px;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.landing-preview-actions .btn-followup:hover {
  background: var(--color-primary-transparent);
}

.landing-preview-footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-4);
}

/* ========== Result Display (replaces preview after generation) ========== */
.landing-result {
  display: none;
}

.landing-result.visible {
  display: block;
}

.landing-result-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.landing-result-thumb {
  width: 80px;
  height: 45px;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.landing-result-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.landing-result-overview {
  margin-bottom: var(--space-4);
}

.landing-result-overview p {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin: 0;
}

.landing-result-keypoints {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-5);
}

.landing-result-keypoints li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-text);
}

.landing-result-keypoints li .bullet-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  color: var(--color-primary);
}

/* ========== Landing Chat ========== */
.landing-chat {
  margin-top: var(--space-4);
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--space-4);
}

.landing-chat-messages {
  max-height: 240px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.landing-chat-bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  line-height: 1.5;
  max-width: 90%;
}

.landing-chat-bubble.user {
  background: var(--color-primary);
  color: var(--color-white);
  align-self: flex-end;
  border-bottom-right-radius: var(--radius-sm);
}

.landing-chat-bubble.ai {
  background: var(--color-surface-secondary);
  color: var(--color-text);
  align-self: flex-start;
  border-bottom-left-radius: var(--radius-sm);
}

.landing-chat-bubble.ai p {
  margin: 0 0 var(--space-2);
}

.landing-chat-bubble.ai p:last-child {
  margin-bottom: 0;
}

.landing-chat-form {
  display: flex;
  gap: var(--space-2);
}

.landing-chat-input {
  flex: 1;
  height: 40px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
}

.landing-chat-input:focus {
  border-color: var(--color-primary);
}

.landing-chat-input::placeholder {
  color: var(--color-text-tertiary);
}

.landing-chat-send {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.landing-chat-send:hover {
  background: var(--color-primary-dark);
}

.landing-chat-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.landing-chat-limit {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin: var(--space-2) 0 0;
  text-align: center;
}

.landing-chat-limit a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.landing-chat-limit a:hover {
  text-decoration: underline;
}

/* Inline Signup Gate (shown after chat limit) */
.inline-signup-gate {
  margin-top: var(--space-4);
  padding: var(--space-5);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(147, 51, 234, 0.06));
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-lg, 12px);
  text-align: center;
}

.inline-signup-header {
  margin-bottom: var(--space-4);
}

.inline-signup-icon {
  font-size: 1.5rem;
  display: block;
  margin-bottom: var(--space-1);
}

.inline-signup-header h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-1) 0;
}

.inline-signup-header p {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.inline-signup-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.inline-signup-form input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md, 8px);
  font-size: 0.875rem;
  background: var(--color-surface, #fff);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.inline-signup-form input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.inline-signup-form .landing-submit-btn {
  width: 100%;
  margin-top: var(--space-1);
}

.inline-signup-error {
  font-size: 0.8rem;
  color: var(--color-error, #ef4444);
  margin: var(--space-2) 0 0;
  min-height: 1.2em;
}

.inline-signup-login {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin: var(--space-2) 0 0;
}

.inline-signup-login a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.inline-signup-login a:hover {
  text-decoration: underline;
}

.landing-chat-typing {
  display: flex;
  gap: 4px;
  padding: var(--space-3) var(--space-4);
  align-self: flex-start;
}

.landing-chat-typing span {
  width: 6px;
  height: 6px;
  background: var(--color-text-tertiary);
  border-radius: 50%;
  animation: chatTyping 1.4s ease-in-out infinite;
}

.landing-chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.landing-chat-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatTyping {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-4px); }
}

/* ========== Benefits Section ========== */
.landing-benefits {
  padding: 64px var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
}

.landing-section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 var(--space-12);
  color: var(--color-text);
}

.landing-benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.landing-benefit-card {
  text-align: center;
  padding: var(--space-6);
}

.landing-benefit-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  background: var(--color-primary-transparent);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.landing-benefit-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--color-text);
}

.landing-benefit-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ========== How It Works ========== */
.landing-steps {
  padding: 64px var(--space-8);
  background: var(--color-surface-secondary);
}

.landing-steps-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.landing-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

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

.landing-step-number {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-4);
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
}

.landing-step h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--color-text);
}

.landing-step p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ========== Pricing Section ========== */
.landing-pricing {
  padding: 64px var(--space-8);
  max-width: 900px;
  margin: 0 auto;
}

.landing-pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.landing-pricing-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: border-color var(--transition-fast);
}

.landing-pricing-card.featured {
  border-color: var(--color-primary);
  position: relative;
}

.landing-pricing-card.featured::before {
  content: 'Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-white);
  padding: 2px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.landing-pricing-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--color-text);
}

.landing-pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-4) 0;
}

.landing-pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.landing-pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
  text-align: left;
}

.landing-pricing-features li {
  padding: var(--space-2) 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.landing-pricing-features li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
}

.landing-pricing-btn {
  display: block;
  width: 100%;
  height: 48px;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.landing-pricing-btn.primary {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
}

.landing-pricing-btn.primary:hover {
  background: var(--color-primary-dark);
}

.landing-pricing-btn.secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}

.landing-pricing-btn.secondary:hover {
  border-color: var(--color-primary);
}

/* ========== Final CTA Section ========== */
.landing-final-cta {
  padding: 80px var(--space-8);
  text-align: center;
  background: var(--color-surface-secondary);
}

.landing-final-cta h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 var(--space-4);
  color: var(--color-text);
}

.landing-final-cta p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-8);
}

.landing-final-input-group {
  display: flex;
  gap: var(--space-3);
  max-width: 560px;
  margin: 0 auto;
}

/* ========== Footer ========== */
.landing-footer {
  padding: var(--space-8) var(--space-8);
  border-top: 1px solid var(--color-border);
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.landing-footer-links {
  display: flex;
  gap: var(--space-6);
}

.landing-footer-links a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.landing-footer-links a:hover {
  color: var(--color-text);
}

.landing-footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .landing-hero {
    grid-template-columns: 1fr;
    padding: 48px var(--space-4) 32px;
    gap: var(--space-8);
  }

  .landing-hero h1 {
    font-size: 2.25rem;
  }

  .landing-input-group,
  .landing-final-input-group {
    flex-direction: column;
  }

  .landing-submit-btn {
    width: 100%;
  }

  .landing-preview-card {
    max-width: 100%;
  }

  .landing-benefits-grid,
  .landing-steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .landing-pricing-grid {
    grid-template-columns: 1fr;
  }

  .landing-nav {
    padding: 0 var(--space-4);
  }

  .landing-nav-links {
    gap: var(--space-4);
  }

  .landing-nav-links .nav-link-desktop {
    display: none;
  }

  .landing-footer {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .landing-hero h1 {
    font-size: 1.875rem;
  }

  .landing-hero-sub {
    font-size: 1rem;
  }

  .landing-benefits,
  .landing-steps,
  .landing-pricing,
  .landing-final-cta {
    padding: 48px var(--space-4);
  }
}