/* CSS Variables */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-elevated: #1a1a24;
  --bg-hover: #22222e;

  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-tertiary: #606070;

  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

  --border-default: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-default);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
}

.brand-name {
  font-size: 20px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

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

.btn-full {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  background: radial-gradient(ellipse at top, rgba(102, 126, 234, 0.15) 0%, transparent 50%);
}

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

.hero-title {
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
}

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

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.preview-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  text-align: center;
}

.preview-icon {
  font-size: 40px;
  margin-bottom: 8px;
}

.preview-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.preview-arrow {
  font-size: 24px;
  color: var(--text-tertiary);
}

/* Sections */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 24px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

/* Features */
.features {
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s;
}

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

.feature-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Oikos Types */
.oikos-types {
  background: var(--bg-primary);
}

.oikos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 32px;
}

.oikos-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 40px;
  transition: all 0.3s;
}

.oikos-card:hover {
  border-color: var(--border-hover);
}

.oikos-card.personal {
  border-top: 3px solid var(--accent-primary);
}

.oikos-card.shared {
  border-top: 3px solid var(--accent-secondary);
}

.oikos-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.oikos-icon {
  font-size: 48px;
}

.oikos-title {
  font-size: 24px;
  font-weight: 600;
}

.oikos-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

.oikos-desc strong {
  color: var(--text-primary);
}

.oikos-features {
  list-style: none;
}

.oikos-features li {
  padding: 8px 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.oikos-features li::before {
  content: "✓";
  color: var(--accent-primary);
  font-weight: 600;
}

/* CTA */
.cta {
  background: var(--bg-secondary);
  text-align: center;
}

.cta-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Footer */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-default);
  padding: 40px 24px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand .brand-icon {
  width: 32px;
  height: 32px;
  font-size: 16px;
}

.footer-brand .brand-name {
  font-size: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

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

.footer-copy {
  color: var(--text-tertiary);
  font-size: 14px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal.active {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

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

/* Auth Forms */
.auth-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
}

.auth-subtitle {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 16px;
  transition: all 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

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

.form-hint {
  display: block;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 6px;
}

.form-hint strong {
  color: var(--accent-primary);
}

.auth-switch {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.auth-switch a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
}

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

.auth-error {
  background: rgba(255, 100, 100, 0.1);
  border: 1px solid rgba(255, 100, 100, 0.3);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: #ff6464;
  font-size: 14px;
  margin-top: 16px;
}

.auth-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--text-secondary);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-default);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Family/Character Selection */
.family-list,
.character-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  max-height: 300px;
  overflow-y: auto;
}

.family-item,
.character-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
}

.family-item:hover,
.character-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-hover);
}

.family-icon,
.character-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--bg-elevated);
}

.character-avatar {
  border-radius: 50%;
}

.family-info,
.character-info {
  flex: 1;
}

.family-info h3,
.character-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.family-info p,
.character-info p {
  font-size: 13px;
  color: var(--text-secondary);
}

.family-arrow {
  color: var(--text-tertiary);
  font-size: 20px;
}

.quarters-badge {
  color: #ffd700;
}

.back-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  padding: 0;
  margin-bottom: 16px;
  transition: color 0.2s;
}

.back-btn:hover {
  color: var(--text-primary);
}

/* Avatar Picker */
.avatar-picker {
  display: flex;
  align-items: center;
  gap: 16px;
}

.avatar-input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 24px;
  text-align: center;
}

.avatar-preview {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.avatar-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.avatar-option {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.avatar-option:hover {
  border-color: var(--accent-primary);
  transform: scale(1.1);
}

/* Color Picker */
.color-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.color-option {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: all 0.2s;
}

.color-option:hover {
  transform: scale(1.1);
}

.color-option.selected {
  border-color: white;
  box-shadow: 0 0 0 2px var(--accent-primary);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  .hero-subtitle {
    font-size: 16px;
  }

  .preview-arrow {
    display: none;
  }

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

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

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}