/* ==========================================================================
   Bird Picker – Pure Native CSS (Mobile First)
   Breakpoints: 560px, 720px
   No external fonts, no CDN dependencies
   ========================================================================== */

/* Design Tokens & CSS Variables */
:root {
  --color-bg: #F7F5F0;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F9FAFB;
  --color-surface-alt: #F0EDE4;
  --color-primary: #2D6A4F;
  --color-primary-dark: #1B4332;
  --color-primary-light: #E8F5E9;
  --color-accent: #D97706;
  --color-accent-dark: #B45309;
  --color-accent-light: #FEF3C7;
  --color-text-main: #1F2937;
  --color-text-muted: #4B5563;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;
  --color-border-dark: #D1D5DB;
  --color-success: #15803D;
  --color-focus: #2D6A4F;
  
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --transition-fast: 0.15s ease;
  --transition-norm: 0.25s ease;
}

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

html {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

/* Universal Focus Styles for Accessibility */
a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 1px #FFFFFF;
}

/* Screen reader utility */
.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;
}

/* Layout Containers */
.section-container {
  width: 100%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ==========================================================================
   1. Site Header
   ========================================================================== */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-primary-dark);
  font-weight: 800;
  font-size: 1.25rem;
  transition: opacity var(--transition-fast);
}

.site-logo:hover {
  opacity: 0.85;
}

.logo-emoji {
  font-size: 1.5rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* ==========================================================================
   2. Hero Section
   ========================================================================== */
.hero-section {
  padding: 2.5rem 0 1.5rem;
  text-align: center;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-primary-dark);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 1.5rem;
}

.hero-capsules {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.capsule {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

.capsule-icon {
  font-size: 1rem;
}

/* ==========================================================================
   3. Generator Section
   ========================================================================== */
.generator-section {
  padding: 2rem 0;
}

/* Filters Card */
.filters-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
}

.filters-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.75rem;
}

.filters-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.pool-counter {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.pool-counter strong {
  color: var(--color-primary);
  font-size: 1.05rem;
  background-color: var(--color-primary-light);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
}

.filters-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.filter-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.filter-select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-main);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.filter-select:hover {
  border-color: var(--color-primary);
}

.filter-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1rem;
}

.btn-reset-filters {
  background: none;
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-light);
  cursor: pointer;
  text-decoration: underline;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.btn-reset-filters:hover {
  color: var(--color-primary-dark);
}

/* Big Pick Button */
.pick-trigger-wrap {
  display: flex;
  justify-content: center;
  margin: 1.5rem 0 2rem;
}

.btn-pick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  max-width: 440px;
  padding: 1rem 1.75rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-pill);
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(45, 106, 79, 0.35);
  transition: transform 0.1s ease, box-shadow var(--transition-fast), opacity var(--transition-fast);
  min-height: 58px;
}

.btn-pick:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 106, 79, 0.45);
}

.btn-pick:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-pick.disabled,
.btn-pick:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-pick-icon {
  font-size: 1.4rem;
}

/* Result Card */
.result-area {
  margin-top: 1rem;
}

.result-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: transform var(--transition-norm);
}

.result-card.pulse-animation {
  animation: cardPulse 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cardPulse {
  0% { transform: scale(0.98); opacity: 0.8; }
  100% { transform: scale(1); opacity: 1; }
}

.result-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.25rem;
}

.bird-emoji-display {
  font-size: 4rem;
  line-height: 1;
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-pill);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.bird-headings {
  width: 100%;
}

.bird-common-name {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.bird-sci-name {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 0.6rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
}

.meta-badge {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(45, 106, 79, 0.2);
}

/* Bird Stats Grid */
.bird-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1.25rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--color-text-light);
  margin-bottom: 0.15rem;
}

.stat-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.4;
}

/* Description Box */
.bird-desc-box {
  background-color: #FFFFFF;
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 0.85rem 1rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.bird-desc-text {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--color-text-main);
}

/* Action Buttons (3 buttons) */
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 46px;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-action .action-icon {
  font-size: 1.1rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

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

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border-color: var(--color-border-dark);
}

.btn-secondary:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.btn-accent {
  background-color: var(--color-accent-light);
  color: var(--color-accent-dark);
  border-color: rgba(217, 119, 6, 0.3);
}

.btn-accent:hover {
  background-color: #FDE68A;
}

/* Copied Alert Toast */
.copy-alert {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: var(--color-text-main);
  color: #FFFFFF;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-md);
  z-index: 10;
}

.copy-alert.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   4. How It Works Section
   ========================================================================== */
.how-it-works-section {
  padding: 3rem 0;
  background-color: #FFFFFF;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  text-align: center;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.section-lead {
  font-size: 1rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.step-card {
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 1.1rem;
  border-radius: var(--radius-pill);
  margin-bottom: 0.75rem;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

/* ==========================================================================
   5. Educational Guide Section
   ========================================================================== */
.guide-wrapper {
  padding: 3rem 0;
}

.guide-article {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.guide-article h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  line-height: 1.3;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 0.75rem;
}

.article-body p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-main);
  margin-bottom: 1.25rem;
}

.article-body p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   6. Complete Directory Section (Grouped by Family)
   ========================================================================== */
.directory-section {
  padding: 3rem 0;
  background-color: #FFFFFF;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.directory-header {
  margin-bottom: 1.5rem;
}

.directory-search-wrap {
  max-width: 450px;
  margin: 1.25rem auto 0;
}

.directory-search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-pill);
  background-color: var(--color-bg);
  min-height: 46px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.directory-search-input:hover,
.directory-search-input:focus {
  background-color: #FFFFFF;
  border-color: var(--color-primary);
}

.directory-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.directory-family-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.directory-family-card[open] {
  border-color: var(--color-primary);
}

.family-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  cursor: pointer;
  background-color: var(--color-surface);
  user-select: none;
  list-style: none;
}

.family-summary::-webkit-details-marker {
  display: none;
}

.family-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.family-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.family-order {
  font-size: 0.8rem;
  color: var(--color-text-light);
  font-style: italic;
}

.family-badge {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-pill);
}

.family-species-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.species-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.species-chip:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary-dark);
}

.species-chip:hover .chip-sci {
  color: rgba(255, 255, 255, 0.85);
}

.chip-emoji {
  font-size: 1rem;
}

.chip-name {
  font-weight: 600;
}

.chip-sci {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-left: 0.15rem;
}

.directory-empty {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-light);
  font-style: italic;
}

/* ==========================================================================
   7. FAQ Section
   ========================================================================== */
.faq-section {
  padding: 3rem 0;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.4;
  margin: 0;
}

.faq-icon {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-left: 0.75rem;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid transparent;
}

.faq-answer p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* ==========================================================================
   8. Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary-dark);
  color: #D1D5DB;
  padding: 2.5rem 0 1.5rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-brand {
  margin-bottom: 1.25rem;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: #FFFFFF;
  display: inline-block;
  margin-bottom: 0.25rem;
}

.footer-tagline {
  color: #9CA3AF;
  font-size: 0.85rem;
}

.footer-disclaimer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
  margin-bottom: 1.25rem;
}

.footer-disclaimer p {
  font-size: 0.85rem;
  color: #9CA3AF;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
  font-size: 0.8rem;
  color: #6B7280;
  text-align: center;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINT 1: 560px and up
   ========================================================================== */
@media (min-width: 560px) {
  .hero-title {
    font-size: 2.4rem;
  }

  .filters-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .filters-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .bird-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-actions {
    flex-direction: row;
  }

  .result-actions .btn-action {
    flex: 1;
  }

  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .guide-article {
    padding: 2.5rem 2rem;
  }

  .guide-article h2 {
    font-size: 1.75rem;
  }
}

/* ==========================================================================
   RESPONSIVE BREAKPOINT 2: 720px and up
   ========================================================================== */
@media (min-width: 720px) {
  .header-container {
    flex-direction: row;
    justify-content: space-between;
    padding: 1rem;
  }

  .hero-title {
    font-size: 2.85rem;
  }

  .filters-card {
    padding: 1.5rem;
  }

  .filters-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .result-card {
    padding: 2rem;
  }

  .result-top {
    flex-direction: row;
    text-align: left;
    align-items: center;
    gap: 1.5rem;
  }

  .bird-emoji-display {
    width: 105px;
    height: 105px;
    font-size: 4.5rem;
    flex-shrink: 0;
  }

  .badge-row {
    justify-content: flex-start;
  }

  .bird-stats-grid {
    grid-template-columns: repeat(4, 1fr);
    padding: 1.25rem;
  }

  .family-summary {
    padding: 1rem 1.25rem;
  }
}