/* ========================================
   TutorGPT Landing Page Styles
   Warm beige/cream palette - old book aesthetic
   ======================================== */

:root {
  /* Colors - warm beige/cream palette */
  --color-bg: #f5f0e6;
  --color-bg-elevated: #faf8f3;
  --color-bg-secondary: #ebe5d8;
  --color-bg-dark: #3d3831;
  --color-text: #2c2820;
  --color-text-secondary: #5c5548;
  --color-text-tertiary: #8a8275;
  --color-accent: #8b7355;
  --color-accent-light: #a69279;
  --color-border: #d9d0c1;
  --color-border-light: #e8e2d6;

  /* Typography */
  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(44, 40, 32, 0.04);
  --shadow-md: 0 4px 12px rgba(44, 40, 32, 0.06);
  --shadow-lg: 0 8px 24px rgba(44, 40, 32, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

/* ========================================
   Navbar
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(245, 240, 230, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
}

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

.nav-cta {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-bg-elevated);
  background: var(--color-accent);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-lg);
  transition: background 0.2s ease;
  box-shadow: none;
}

.nav-cta:hover {
  background: var(--color-accent-light);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease;
}

.user-avatar:hover {
  background: var(--color-accent-light);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg-elevated);
}

.btn-primary:hover {
  background: var(--color-accent-light);
}

.btn-secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-secondary);
}

.btn-lg {
  font-size: 1.05rem;
  padding: var(--space-4) var(--space-8);
}

.btn-disabled {
  background: var(--color-border);
  color: var(--color-text-tertiary);
  cursor: not-allowed;
  pointer-events: none;
}

.download-note {
  display: block;
  margin-top: var(--space-3);
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   Hero Section - Text Only
   ======================================== */
.hero {
  padding: calc(var(--space-20) + 80px) var(--space-6) var(--space-20);
  text-align: center;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero-text {
  max-width: 800px;
  margin: 0 auto;
}

.social-proof {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.avatars {
  display: flex;
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-border);
  border: 2px solid var(--color-bg);
  margin-left: -8px;
}

.avatar:first-child {
  margin-left: 0;
}

.social-proof span {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 4.5rem;
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: var(--space-8);
}

.hero h1 em {
  font-style: italic;
}

.hero-subtitle {
  font-size: 1.35rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-10);
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.hero-video {
  margin: var(--space-10) auto;
  max-width: 800px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.hero-video video {
  width: 100%;
  display: block;
}

.hero-ctas {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
}

/* Hide the app preview visual */
.hero-visual {
  display: none;
}

/* ========================================
   Partners Section
   ======================================== */
.partners {
  padding: var(--space-12) var(--space-6);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.partners p {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-6);
}

.partner-logos {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.partner-logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  opacity: 0.5;
}

/* ========================================
   Benefits Section
   ======================================== */
.benefits {
  padding: var(--space-20) var(--space-6);
}

.benefits h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-12);
}

.benefits-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.benefit-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.benefit-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  margin-bottom: var(--space-5);
}

.benefit-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--space-3);
}

.benefit-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ========================================
   How it Works Section
   ======================================== */
.how-it-works {
  padding: var(--space-20) var(--space-6);
  background: var(--color-bg-secondary);
}

.how-it-works h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-12);
}

.steps {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.step {
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-accent);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  margin: 0 auto var(--space-5);
}

.step h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: var(--space-3);
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
  padding: var(--space-20) var(--space-6);
}

.pricing h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-3);
}

.pricing-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
}

.pricing-cards {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.pricing-cards.pricing-single {
  grid-template-columns: 1fr;
  max-width: 380px;
}

.pricing-cards.pricing-triple {
  max-width: 1000px;
  grid-template-columns: repeat(3, 1fr);
}

.pricing-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
}

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

.pricing-badge {
  position: absolute;
  top: calc(var(--space-4) * -1);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: var(--color-bg-elevated);
  font-size: 0.75rem;
  font-weight: 500;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-md);
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
}

.pricing-header h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--space-2);
}

.price {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text);
}

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

.pricing-features {
  margin-bottom: var(--space-8);
}

.pricing-features li {
  padding: var(--space-2) 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.pricing-features li::before {
  content: '';
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.25;
  flex-shrink: 0;
}

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

/* ========================================
   Testimonials Section
   ======================================== */
.testimonials {
  padding: var(--space-20) var(--space-6);
  background: var(--color-bg-secondary);
}

.testimonials h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-12);
}

.testimonials-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.testimonial-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.testimonial-stars {
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.testimonial-card p {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-border);
}

.testimonial-author strong {
  display: block;
  font-size: 0.9rem;
}

.testimonial-author span {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq {
  padding: var(--space-20) var(--space-6);
}

.faq h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-12);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

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

.faq-item summary {
  padding: var(--space-5) 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-tertiary);
}

.faq-item[open] summary::after {
  content: '-';
}

.faq-item p {
  padding-bottom: var(--space-5);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
  padding: var(--space-20) var(--space-6);
  background: var(--color-bg-dark);
  color: var(--color-bg);
}

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

.cta h2 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.cta p {
  font-size: 1.1rem;
  opacity: 0.8;
  margin-bottom: var(--space-8);
}

.cta .btn-primary {
  background: var(--color-bg);
  color: var(--color-bg-dark);
}

.cta .btn-primary:hover {
  background: var(--color-bg-secondary);
}

.cta-note {
  display: block;
  margin-top: var(--space-4);
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--space-16) var(--space-6) var(--space-8);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-12);
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--space-16);
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: 1000px;
  margin: 0 auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-light);
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 900px) {
  .hero h1 {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .benefits-grid,
  .pricing-cards,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .nav-links {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-10);
  }

  .footer-links {
    gap: var(--space-8);
  }
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-ctas {
    flex-direction: column;
  }

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

  .partner-logos {
    gap: var(--space-6);
  }
}

/* ========================================
   Auth Section
   ======================================== */
.auth-section {
  min-height: 100vh;
  padding: calc(var(--space-20) + 80px) var(--space-6) var(--space-20);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-container {
  width: 100%;
  max-width: 440px;
}

.auth-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
}

.auth-card h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 400;
  margin-bottom: var(--space-3);
}

.auth-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.form-group input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

.form-group input::placeholder {
  color: var(--color-text-tertiary);
}

.btn-block {
  width: 100%;
}

.message {
  margin-top: var(--space-6);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
}

.message.success {
  background: rgba(74, 124, 89, 0.1);
  color: #4a7c59;
  border: 1px solid rgba(74, 124, 89, 0.2);
}

.message.error {
  background: rgba(158, 59, 59, 0.1);
  color: #9e3b3b;
  border: 1px solid rgba(158, 59, 59, 0.2);
}

.hidden {
  display: none !important;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: var(--space-6) auto;
}

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

/* ========================================
   Dashboard Section
   ======================================== */
.dashboard-section {
  min-height: 100vh;
  padding: calc(var(--space-16) + 80px) var(--space-6) var(--space-16);
}

.dashboard-container {
  max-width: 700px;
  margin: 0 auto;
}

.dashboard-container h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  margin-bottom: var(--space-8);
}

.dashboard-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.dashboard-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.dashboard-card > p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.key-display {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.key-display code {
  flex: 1;
  padding: var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  word-break: break-all;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.85rem;
}

.subscription-info {
  margin-bottom: var(--space-5);
}

.subscription-info p {
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.cancel-notice {
  color: var(--color-accent) !important;
  font-style: italic;
  margin-bottom: var(--space-5);
}

.subscription-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.btn-danger {
  background: #9e3b3b;
  color: white;
}

.btn-danger:hover {
  background: #b34545;
}

.loading-container {
  text-align: center;
  padding: var(--space-16) 0;
}

.loading-container p {
  color: var(--color-text-secondary);
  margin-top: var(--space-4);
}

.error-card {
  text-align: center;
}

/* ========================================
   Modal
   ======================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(44, 40, 32, 0.5);
}

.modal-content {
  position: relative;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 440px;
  width: 100%;
}

.modal-content h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.modal-content p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-top: var(--space-8);
}