/* ==========================================================================
   Local Permit AI - Design System & Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Primary (Trust Blue) */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  /* Colors - Accent (Success Green) */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

  /* Colors - Warning (Amber) */
  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;

  /* Colors - Error (Red) */
  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;

  /* Colors - Neutral */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Type Scale */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Spacing Scale */
  --space-1: 0.25rem;     /* 4px */
  --space-2: 0.5rem;      /* 8px */
  --space-3: 0.75rem;     /* 12px */
  --space-4: 1rem;        /* 16px */
  --space-5: 1.25rem;     /* 20px */
  --space-6: 1.5rem;      /* 24px */
  --space-8: 2rem;        /* 32px */
  --space-10: 2.5rem;     /* 40px */
  --space-12: 3rem;       /* 48px */
  --space-16: 4rem;       /* 64px */

  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  min-height: 100vh;
}

/* Focus States for Accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   3. Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* --------------------------------------------------------------------------
   4. Header
   -------------------------------------------------------------------------- */
.header {
  background: white;
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-gray-900);
}

.header__logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-700));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-xl);
}

.header__logo-text {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
}

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

.header__link {
  color: var(--color-gray-600);
  text-decoration: none;
  font-weight: var(--font-medium);
  transition: color var(--transition-fast);
}

.header__link:hover {
  color: var(--color-primary-600);
}

.header__cta {
  background: var(--color-primary-600);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-semibold);
  transition: background var(--transition-fast);
}

.header__cta:hover {
  background: var(--color-primary-700);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-16) 0;
  text-align: center;
  background: linear-gradient(180deg, white 0%, var(--color-primary-50) 100%);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: 3rem;
  }
}

.hero__title-highlight {
  color: var(--color-primary-600);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

/* --------------------------------------------------------------------------
   6. Search Box
   -------------------------------------------------------------------------- */
.search-box {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-6);
  max-width: 700px;
  margin: 0 auto;
}

.search-box__location {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.search-box__location-icon {
  color: var(--color-primary-500);
}

.search-box__location-text {
  flex: 1;
  color: var(--color-gray-700);
}

.search-box__location-change {
  color: var(--color-primary-600);
  background: none;
  border: none;
  cursor: pointer;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
}

.search-box__form {
  display: flex;
  gap: var(--space-3);
}

.search-box__input-wrapper {
  flex: 1;
  position: relative;
}

.search-box__input {
  width: 100%;
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-12);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box__input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.search-box__input::placeholder {
  color: var(--color-gray-400);
}

.search-box__input-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-gray-400);
}

.search-box__button {
  background: var(--color-primary-600);
  color: white;
  border: none;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.search-box__button:hover:not(:disabled) {
  background: var(--color-primary-700);
  transform: translateY(-1px);
}

.search-box__button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   7. Quick Questions
   -------------------------------------------------------------------------- */
.quick-questions {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-gray-200);
}

.quick-questions__label {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.quick-questions__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.quick-questions__item {
  background: var(--color-gray-100);
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.quick-questions__item:hover {
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

/* --------------------------------------------------------------------------
   8. Results Section
   -------------------------------------------------------------------------- */
.results {
  padding: var(--space-12) 0;
  display: none;
}

.results.is-visible {
  display: block;
}

.results__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.results__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
}

.results__meta {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* --------------------------------------------------------------------------
   9. Answer Card
   -------------------------------------------------------------------------- */
.answer-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.answer-card__header {
  padding: var(--space-6);
  background: linear-gradient(135deg, var(--color-primary-50), white);
  border-bottom: 1px solid var(--color-gray-200);
}

.answer-card__question {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.answer-card__question-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--color-primary-500);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-sm);
}

.answer-card__body {
  padding: var(--space-6);
}

.answer-card__summary {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-gray-700);
  margin-bottom: var(--space-6);
}

.answer-card__summary strong {
  color: var(--color-gray-900);
}

/* Requirements List */
.requirements {
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-6);
}

.requirements__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-gray-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.requirements__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.requirements__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
}

.requirements__item-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: var(--color-success-100);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-success-600);
  font-size: var(--text-xs);
}

.requirements__item-text {
  flex: 1;
}

.requirements__item-name {
  font-weight: var(--font-medium);
  color: var(--color-gray-900);
}

.requirements__item-detail {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin-top: var(--space-1);
}

/* Sources */
.sources {
  border-top: 1px solid var(--color-gray-200);
  padding-top: var(--space-5);
}

.sources__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-gray-700);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.sources__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary-600);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.sources__link:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

/* Disclaimer */
.disclaimer {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: var(--color-warning-50);
  border: 1px solid var(--color-warning-100);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-warning-600);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   10. Loading State
   -------------------------------------------------------------------------- */
.loading {
  display: none;
  padding: var(--space-12);
  text-align: center;
}

.loading.is-visible {
  display: block;
}

.loading__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-4);
}

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

.loading__text {
  color: var(--color-gray-600);
  font-size: var(--text-base);
}

.loading__subtext {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   11. Error State
   -------------------------------------------------------------------------- */
.error {
  display: none;
  padding: var(--space-8);
  text-align: center;
  background: var(--color-error-50);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-error-100);
}

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

.error__icon {
  width: 48px;
  height: 48px;
  background: var(--color-error-100);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  color: var(--color-error-500);
  font-size: var(--text-2xl);
}

.error__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-error-600);
  margin-bottom: var(--space-2);
}

.error__message {
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
}

.error__retry {
  background: var(--color-error-500);
  color: white;
  border: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.error__retry:hover {
  background: var(--color-error-600);
}

/* --------------------------------------------------------------------------
   12. Features Section
   -------------------------------------------------------------------------- */
.features {
  padding: var(--space-16) 0;
  background: white;
}

.features__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.features__title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.features__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.feature-card__icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-100);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: var(--text-2xl);
}

.feature-card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.feature-card__text {
  color: var(--color-gray-600);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-8) 0;
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  text-align: center;
}

.footer__text {
  font-size: var(--text-sm);
}

.footer__heart {
  color: var(--color-error-500);
}

/* --------------------------------------------------------------------------
   14. Utilities
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Mobile responsive nav */
@media (max-width: 768px) {
  .header__nav {
    display: none;
  }
  
  .hero__title {
    font-size: var(--text-2xl);
  }
  
  .search-box__form {
    flex-direction: column;
  }
  
  .search-box__button {
    justify-content: center;
  }
}