/**
 * TytoNest Design System
 * Color Palette: Barn Owl (Tyto alba) inspired
 * Primary: Warm Brown #5C4033 (back plumage)
 * Secondary: Creamy White #F5F0E8 (face disc)
 * Accent: Golden Amber #D4A03C (owl eyes)
 * Design: Mobile-first, responsive, accessible
 */

/* ============================================
   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;
  scroll-behavior: smooth;
}

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

/* ============================================
   DESIGN TOKENS
   ============================================ */

:root {
  /* === Barn Owl Color Palette === */

  /* Primary - Warm Brown (back plumage) */
  --color-brown: #5C4033;
  --color-brown-light: #7A5D4F;
  --color-brown-dark: #3D2A21;
  --color-brown-rgb: 92, 64, 51;

  /* Accent - Golden Amber (owl eyes) */
  --color-amber: #D4A03C;
  --color-amber-light: #E4BD6B;
  --color-amber-dark: #B8872A;
  --color-amber-rgb: 212, 160, 60;

  /* Warm Naturals */
  --color-cream: #F5F0E8;
  --color-linen: #FAF7F2;
  --color-tan: #C4A882;
  --color-warm-gray: #A89585;

  /* Twilight (dark backgrounds) */
  --color-twilight: #2C2418;
  --color-twilight-light: #3D3427;
  --color-twilight-rgb: 44, 36, 24;

  /* Semantic mapping */
  --color-primary: var(--color-brown);
  --color-primary-light: var(--color-brown-light);
  --color-primary-dark: var(--color-brown-dark);
  --color-primary-rgb: var(--color-brown-rgb);
  --color-accent: var(--color-amber);
  --color-accent-light: var(--color-amber-light);
  --color-accent-dark: var(--color-amber-dark);

  /* Neutrals */
  --color-gray-50: #FAF8F6;
  --color-gray-100: #F0ECE6;
  --color-gray-200: #E0D8CE;
  --color-gray-300: #CCC1B3;
  --color-gray-500: #8C7E70;
  --color-gray-700: #504438;
  --color-gray-800: #3A3028;
  --color-gray-900: #2A2119;

  /* Surfaces */
  --color-background: var(--color-linen);
  --color-surface: #FFFFFF;
  --color-surface-dark: var(--color-cream);
  --color-border: var(--color-gray-200);
  --color-text: var(--color-gray-800);
  --color-text-light: var(--color-gray-500);
  --color-text-muted: var(--color-warm-gray);

  /* === Typography === */
  --font-primary: 'Georgia', 'Times New Roman', 'Noto Serif', serif;
  --font-heading: 'Trebuchet MS', 'Gill Sans', 'Avenir', 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'SF Mono', Monaco, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.04em;
  --tracking-wider: 0.08em;

  /* === Spacing (8pt grid) === */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* === Border Radius === */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* === Shadows (warm tinted) === */
  --shadow-sm: 0 1px 2px rgba(44, 36, 24, 0.06);
  --shadow-base: 0 1px 3px rgba(44, 36, 24, 0.08), 0 1px 2px rgba(44, 36, 24, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(44, 36, 24, 0.08), 0 2px 4px -1px rgba(44, 36, 24, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(44, 36, 24, 0.08), 0 4px 6px -2px rgba(44, 36, 24, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(44, 36, 24, 0.1), 0 10px 10px -5px rgba(44, 36, 24, 0.03);

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

/* ============================================
   BASE ELEMENTS
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-xl); }

p {
  line-height: var(--leading-normal);
  color: var(--color-text-light);
}

a {
  color: var(--color-brown);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-amber);
}

img { max-width: 100%; height: auto; }

:focus-visible {
  outline: 2px solid var(--color-amber);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
}

.section {
  padding: var(--space-16) 0;
}

.section-cream {
  background-color: var(--color-cream);
}

.section-dark {
  background-color: var(--color-twilight);
  color: var(--color-cream);
}

.section-dark h2,
.section-dark h3 {
  color: var(--color-cream);
}

.section-dark p {
  color: var(--color-warm-gray);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-lead {
  font-size: var(--text-lg);
  color: var(--color-text-light);
}

.section-dark .section-lead {
  color: var(--color-warm-gray);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
}

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

.logo:hover { text-decoration: none; }

.logo-icon {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-brown);
  letter-spacing: var(--tracking-tight);
}

.nav-links {
  display: flex;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.nav-link:hover {
  color: var(--color-brown);
  background-color: var(--color-gray-100);
  text-decoration: none;
}

@media (max-width: 639px) {
  .nav-links { display: none; }
}

/* ============================================
   HERO
   ============================================ */

.hero {
  padding: var(--space-16) 0 var(--space-20);
  overflow: hidden;
}

.hero > .container {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.hero-content {
  flex: 1;
  min-width: 0;
}

.hero-title {
  font-size: var(--text-5xl);
  color: var(--color-brown-dark);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-8);
  max-width: 520px;
  line-height: var(--leading-relaxed);
}

.hero-subtitle em {
  font-style: italic;
  color: var(--color-brown);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-art {
  flex: 0 0 280px;
}

.owl-silhouette svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 4px 12px rgba(44, 36, 24, 0.1));
}

@media (max-width: 767px) {
  .hero > .container {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-title {
    font-size: var(--text-3xl);
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-art {
    flex: none;
    width: 180px;
  }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: 1;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: 44px;
  letter-spacing: var(--tracking-wide);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--color-brown);
  color: var(--color-cream);
}

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

.btn-outline {
  background-color: transparent;
  border-color: var(--color-brown);
  color: var(--color-brown);
}

.btn-outline:hover {
  background-color: var(--color-brown);
  color: var(--color-cream);
}

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

@media (max-width: 639px) {
  .btn {
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
  }
}

/* ============================================
   CARDS
   ============================================ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 767px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-base);
  transition: box-shadow var(--transition-slow), transform var(--transition-slow);
  border: 1px solid var(--color-border);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  color: var(--color-brown);
}

.card p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

/* ============================================
   FIELD NOTES
   ============================================ */

.notes-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 780px;
  margin: 0 auto;
}

.note-card {
  display: flex;
  gap: var(--space-6);
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.note-card:hover {
  box-shadow: var(--shadow-md);
}

.note-date {
  flex: 0 0 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--color-cream);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  text-align: center;
  min-height: 64px;
}

.note-day {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-brown);
  line-height: 1;
}

.note-month {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.note-content h3 {
  font-size: var(--text-lg);
  color: var(--color-brown);
  margin-bottom: var(--space-2);
}

.note-content p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
}

.note-author {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

@media (max-width: 639px) {
  .note-card {
    flex-direction: column;
    gap: var(--space-3);
  }

  .note-date {
    flex-direction: row;
    gap: var(--space-2);
    min-height: auto;
    width: fit-content;
  }
}

/* ============================================
   SEASONS
   ============================================ */

.seasons-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.season-card {
  background-color: var(--color-twilight-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  border: 1px solid rgba(196, 168, 130, 0.15);
  transition: border-color var(--transition-base);
}

.season-card:hover {
  border-color: rgba(212, 160, 60, 0.3);
}

.season-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-amber);
  margin-bottom: var(--space-3);
  letter-spacing: var(--tracking-wide);
}

.season-card p {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-warm-gray);
}

@media (max-width: 1023px) {
  .seasons-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 639px) {
  .seasons-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   CTA / COMMUNITY
   ============================================ */

.cta-box {
  display: flex;
  align-items: center;
  gap: var(--space-10);
  background-color: var(--color-cream);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  border: 1px solid var(--color-border);
}

.cta-content {
  flex: 1;
}

.cta-content h3 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  color: var(--color-brown);
  margin-bottom: var(--space-3);
}

.cta-content p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.cta-form {
  flex: 0 0 340px;
}

.input-group {
  display: flex;
  gap: var(--space-2);
}

.input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-height: 44px;
  transition: border-color var(--transition-base);
}

.input:focus {
  outline: none;
  border-color: var(--color-amber);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.cta-note {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

@media (max-width: 767px) {
  .cta-box {
    flex-direction: column;
    padding: var(--space-6);
    text-align: center;
  }

  .cta-form {
    flex: none;
    width: 100%;
  }

  .input-group {
    flex-direction: column;
  }
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  background-color: var(--color-twilight);
  padding: var(--space-10) 0 var(--space-6);
  color: var(--color-warm-gray);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: var(--space-8);
  border-bottom: 1px solid rgba(196, 168, 130, 0.15);
  margin-bottom: var(--space-6);
}

.footer-brand .logo-text {
  color: var(--color-cream);
  font-size: var(--text-lg);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-warm-gray);
  margin-top: var(--space-1);
}

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

.footer-links a {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-warm-gray);
  transition: color var(--transition-base);
  letter-spacing: var(--tracking-wide);
}

.footer-links a:hover {
  color: var(--color-amber);
  text-decoration: none;
}

.footer-bottom p {
  font-size: var(--text-sm);
  color: var(--color-warm-gray);
  text-align: center;
  opacity: 0.7;
}

@media (max-width: 639px) {
  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-6);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
  }
}

@media (max-width: 639px) {
  .section {
    padding: var(--space-10) 0;
  }

  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-lg); }

  .section-header {
    margin-bottom: var(--space-8);
  }
}