/* ==========================================================================
   Camera Settings — Design System
   A modern, minimal design system for photography tools
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-white: #ffffff;
  --color-black: #0a0a0a;
  
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  
  /* Semantic colors */
  --color-aurora-quiet: #22c55e;
  --color-aurora-active: #eab308;
  --color-aurora-storm: #ef4444;
  
  /* Typography */
  --font-family: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Font sizes */
  --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;
  --text-7xl: 4.5rem;
  
  /* Line heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* Letter spacing */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;
  
  /* Spacing */
  --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;
  --space-32: 8rem;
  
  /* Layout */
  --container-max: 1200px;
  --container-padding: var(--space-6);
  
  /* Borders */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows - Multi-layered for realistic depth */
  --shadow-sm: 
    0 1px 2px rgb(0 0 0 / 0.04),
    0 2px 4px rgb(0 0 0 / 0.04),
    0 4px 8px rgb(0 0 0 / 0.04);
  --shadow-md: 
    0 2px 4px rgb(0 0 0 / 0.02),
    0 4px 8px rgb(0 0 0 / 0.04),
    0 8px 16px rgb(0 0 0 / 0.04),
    0 16px 32px rgb(0 0 0 / 0.04);
  --shadow-lg: 
    0 2px 4px rgb(0 0 0 / 0.02),
    0 4px 8px rgb(0 0 0 / 0.02),
    0 8px 16px rgb(0 0 0 / 0.04),
    0 16px 32px rgb(0 0 0 / 0.04),
    0 32px 64px rgb(0 0 0 / 0.06);
  --shadow-xl: 
    0 2px 4px rgb(0 0 0 / 0.02),
    0 4px 8px rgb(0 0 0 / 0.02),
    0 8px 16px rgb(0 0 0 / 0.02),
    0 16px 32px rgb(0 0 0 / 0.04),
    0 32px 64px rgb(0 0 0 / 0.06),
    0 64px 128px rgb(0 0 0 / 0.08);
  --shadow-elevated:
    0 0 0 1px rgb(0 0 0 / 0.03),
    0 2px 4px rgb(0 0 0 / 0.02),
    0 8px 16px rgb(0 0 0 / 0.04),
    0 24px 48px rgb(0 0 0 / 0.06);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;
  
  /* Z-index */
  --z-header: 100;
  --z-modal: 200;
}

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

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

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
  background-color: var(--color-white);
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

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

ul,
ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Layout Components
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.section {
  padding-block: var(--space-12);
}

@media (max-width: 768px) {
  .section {
    padding-block: var(--space-8);
  }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-gray-100);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-tight);
}

.logo-icon {
  width: 24px;
  height: 24px;
  opacity: 0.9;
}

.site-footer .logo-icon {
  filter: invert(1);
}

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

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-black);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-black);
  border-radius: var(--radius-full);
}

/* Dropdown arrow */
.nav-link .nav-arrow {
  width: 10px;
  height: 10px;
  stroke: currentColor;
  stroke-width: 2;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-arrow {
  transform: rotate(180deg);
}

/* Dropdown menu */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  padding: var(--space-2) 0;
  margin-top: var(--space-3);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
}

/* Bridge element to prevent gap hover issues */
.nav-dropdown::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}

.nav-dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown-link:hover {
  background-color: var(--color-gray-50);
  color: var(--color-black);
}

.nav-dropdown-link.active {
  color: var(--color-black);
  font-weight: var(--font-weight-medium);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-bar {
  width: 24px;
  height: 2px;
  background-color: var(--color-black);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Mobile Navigation - separate element outside header */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  padding: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: 99;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav .nav-list {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}

.mobile-nav .nav-item {
  border-bottom: 1px solid var(--color-gray-100);
  padding: var(--space-4) 0;
}

.mobile-nav .nav-label {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.mobile-nav .nav-dropdown {
  position: static;
  transform: none;
  min-width: 100%;
  margin-top: 0;
  padding: 0 0 0 var(--space-4);
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  opacity: 1;
  visibility: visible;
  display: block;
}

.mobile-nav .nav-dropdown::before {
  display: none;
}

.mobile-nav .nav-dropdown-link {
  padding: var(--space-2) 0;
  color: var(--color-gray-500);
}

.mobile-nav .nav-dropdown-link:hover {
  color: var(--color-black);
  background: transparent;
}

@media (max-width: 768px) {
  /* Hide desktop nav on mobile */
  .desktop-nav {
    display: none;
  }
  
  /* Show mobile nav container (but still off-screen until .is-open) */
  .mobile-nav {
    display: block;
  }
  
  .menu-toggle {
    display: flex;
  }
}

/* --------------------------------------------------------------------------
   Page Hero Component — Unified Design System
   
   Base class: .page-hero
   Modifiers: .page-hero--aurora, .page-hero--reference, .page-hero--home
   
   Elements: .hero-eyebrow, .hero-title, .hero-description, .hero-content
   -------------------------------------------------------------------------- */

/* Base Page Hero */
.page-hero {
  padding: var(--space-16) 0 var(--space-10);
  background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
  border-bottom: 1px solid var(--color-gray-200);
}

/* Hero Content Container */
.page-hero .hero-content {
  max-width: 720px;
}

/* Hero Eyebrow — Consistent across all pages */
.page-hero .hero-eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

/* Hero Title — Consistent sizing */
.page-hero .hero-title {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

/* Hero Title Emphasis */
.page-hero .hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-gray-600), var(--color-black));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Hero Description — Consistent sizing */
.page-hero .hero-description {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  max-width: 600px;
  margin-bottom: var(--space-8);
}

/* Last element in hero should not have bottom margin */
.page-hero .hero-description:last-child,
.page-hero .hero-nav:last-child {
  margin-bottom: 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .page-hero {
    padding: var(--space-12) 0 var(--space-8);
  }
  
  .page-hero .hero-description {
    font-size: var(--text-base);
  }
}

/* --------------------------------------------------------------------------
   Hero Navigation Links — Shared Component
   -------------------------------------------------------------------------- */
.hero-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero-nav-link {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.hero-nav-link:hover {
  color: var(--color-black);
  background: var(--color-gray-100);
  border-color: var(--color-gray-300);
}

/* --------------------------------------------------------------------------
   Sticky Section Navigation (shared across pages)
   -------------------------------------------------------------------------- */
.section-nav-wrapper {
  position: sticky;
  top: 72px; /* Below the main site header */
  z-index: 90; /* Below header's z-index */
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-gray-200);
  transition: box-shadow var(--transition-fast);
}

.section-nav-wrapper.is-stuck {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.section-nav {
  padding: var(--space-3) 0;
}

.section-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.section-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  flex: 1;
}

.section-nav-link {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.section-nav-link:hover {
  color: var(--color-black);
  background: var(--color-gray-100);
  border-color: var(--color-gray-300);
}

.section-nav-link.active {
  color: var(--color-white);
  background: var(--color-black);
  border-color: var(--color-black);
}

.section-nav-top {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  background: var(--color-gray-100);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  opacity: 0;
  transform: translateX(10px);
  pointer-events: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.section-nav-wrapper.is-stuck .section-nav-top {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.section-nav-top:hover {
  color: var(--color-black);
  background: var(--color-gray-200);
  border-color: var(--color-gray-300);
}

@media (max-width: 768px) {
  .section-nav-links {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .section-nav-links::-webkit-scrollbar {
    display: none;
  }
  
  .section-nav-top span {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Legacy Hero Section (Aurora page specific with OVATION viewer)
   Kept for backward compatibility during transition
   -------------------------------------------------------------------------- */
.hero {
  padding-block: var(--space-20) var(--space-8);
  background: linear-gradient(to bottom, var(--color-gray-50), var(--color-white));
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: var(--space-12);
  align-items: center;
}

@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr 320px;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

.hero-content {
  max-width: 720px;
}

.hero-eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.hero-title {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-gray-600), var(--color-black));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  max-width: 600px;
}

@media (max-width: 768px) {
  .hero {
    padding-block: var(--space-16) var(--space-12);
  }
  
  .hero-description {
    font-size: var(--text-base);
  }
}

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  margin-bottom: var(--space-10);
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-2);
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-gray-500);
}

/* --------------------------------------------------------------------------
   Reference Sections — Shared Component
   Used by guide, nightsky, iphone pages
   -------------------------------------------------------------------------- */
.ref-section {
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.ref-section--alt {
  background: var(--color-gray-50);
}

.ref-subtitle {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-5);
  margin-top: var(--space-10);
}

.ref-subtitle:first-child {
  margin-top: 0;
}

/* Reference Notes — Shared callout style */
.ref-note {
  padding: var(--space-4);
  background: var(--color-gray-100);
  border-left: 3px solid var(--color-gray-400);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  margin-top: var(--space-8);
}

.ref-note strong {
  color: var(--color-black);
}

.ref-note a {
  color: var(--color-gray-700);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ref-note a:hover {
  color: var(--color-black);
}

/* --------------------------------------------------------------------------
   Reference Tables — Shared Component
   -------------------------------------------------------------------------- */
.ref-table-container {
  overflow-x: auto;
  margin-bottom: var(--space-6);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.ref-table th,
.ref-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

.ref-table th {
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-gray-500);
  background: var(--color-gray-100);
}

.ref-table tbody tr:last-child td {
  border-bottom: none;
}

.ref-table tbody tr:hover {
  background: var(--color-gray-50);
}

.ref-table--compact td {
  padding: var(--space-2) var(--space-4);
}

.row-highlight {
  background: rgba(0, 0, 0, 0.02);
}

.row-highlight td:first-child {
  border-left: 3px solid var(--color-black);
}

.row-highlight-label {
  display: inline-block;
  margin-left: var(--space-2);
  padding: 2px var(--space-2);
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--color-black);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  vertical-align: middle;
}

.row-divider {
  border-top: 2px solid var(--color-gray-300);
}

/* Monospace utility for tables */
.mono {
  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.9em;
}

/* --------------------------------------------------------------------------
   Badges — Shared Component
   -------------------------------------------------------------------------- */
.badge {
  display: inline-block;
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
}

.badge--yes {
  background: rgba(34, 197, 94, 0.15);
  color: #15803d;
}

.badge--caution {
  background: rgba(234, 179, 8, 0.15);
  color: #a16207;
}

.badge--no {
  background: rgba(239, 68, 68, 0.1);
  color: #b91c1c;
}

/* Format Badges (for iPhone ProRes etc) */
.format-badge {
  display: inline-block;
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
  background: var(--color-gray-200);
  color: var(--color-gray-700);
}

.format-badge--pro {
  background: var(--color-black);
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   Scenario Cards — Shared Component
   -------------------------------------------------------------------------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

@media (min-width: 1024px) {
  .scenario-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .scenario-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.scenario-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.scenario-title {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-4);
  background: var(--color-black);
  color: var(--color-white);
}

.scenario-settings {
  padding: var(--space-3);
}

.scenario-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) var(--space-1);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-gray-100);
}

.scenario-row:last-child {
  border-bottom: none;
}

.scenario-row span:first-child {
  color: var(--color-gray-500);
}

.scenario-row span:last-child {
  font-weight: var(--font-weight-medium);
}

/* --------------------------------------------------------------------------
   Tips Grid — Shared Component
   -------------------------------------------------------------------------- */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .tips-grid {
    grid-template-columns: 1fr;
  }
}

.tip-block {
  background: var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.tip-block-title {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

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

.tip-list li {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  padding-left: var(--space-4);
  position: relative;
}

.tip-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-gray-400);
}

/* --------------------------------------------------------------------------
   Cheat Grid — Shared Component
   -------------------------------------------------------------------------- */
.cheat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
}

@media (min-width: 1024px) {
  .cheat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .cheat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.cheat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
}

.cheat-term {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-black);
}

.cheat-answer {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
}

/* --------------------------------------------------------------------------
   Photography Guide
   -------------------------------------------------------------------------- */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

@media (max-width: 1024px) {
  .guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .guide-grid {
    grid-template-columns: 1fr;
  }
}

.guide-card {
  background-color: var(--color-gray-100);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.guide-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.guide-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  color: var(--color-gray-600);
}

.guide-title {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-2);
}

.guide-value {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-3);
}

.guide-description {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   Attribution Section
   -------------------------------------------------------------------------- */
.attribution-section {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-gray-100);
}

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

.attribution-text a {
  color: var(--color-gray-700);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.attribution-text a:hover {
  color: var(--color-black);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding-block: var(--space-16) var(--space-8);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-16);
  margin-bottom: var(--space-12);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

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

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

@media (max-width: 640px) {
  .footer-nav {
    grid-template-columns: repeat(2, 1fr);
  }
}

.footer-nav-title {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav-list a {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-gray-800);
}

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

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.condition-card,
.forecast-item,
.guide-card {
  animation: fadeIn var(--transition-slow) ease-out forwards;
}

.condition-card--primary { animation-delay: 0ms; }
.conditions-grid-secondary .condition-card:nth-child(1) { animation-delay: 50ms; }
.conditions-grid-secondary .condition-card:nth-child(2) { animation-delay: 100ms; }
.conditions-grid-secondary .condition-card:nth-child(3) { animation-delay: 150ms; }
.conditions-grid-secondary .condition-card:nth-child(4) { animation-delay: 200ms; }

.guide-card:nth-child(1) { animation-delay: 0ms; }
.guide-card:nth-child(2) { animation-delay: 50ms; }
.guide-card:nth-child(3) { animation-delay: 100ms; }
.guide-card:nth-child(4) { animation-delay: 150ms; }

/* --------------------------------------------------------------------------
   Reference Section Animations
   -------------------------------------------------------------------------- */
.ref-section {
  animation: fadeIn 0.3s ease-out;
}

/* Smooth scroll offset for fixed header */
[id] {
  scroll-margin-top: 100px;
}

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

/* --------------------------------------------------------------------------
   Night Vision Toggle
   -------------------------------------------------------------------------- */
.night-vision-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  background: transparent;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.night-vision-toggle:hover {
  color: var(--color-black);
  border-color: var(--color-gray-400);
  background: var(--color-gray-50);
}

.night-vision-toggle .toggle-icon {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.night-vision-toggle .toggle-label {
  display: inline;
}

@media (max-width: 900px) {
  .night-vision-toggle .toggle-label {
    display: none;
  }
  
  .night-vision-toggle {
    padding: var(--space-2);
  }
}

@media (max-width: 768px) {
  .night-vision-toggle {
    padding: var(--space-2);
    border: none;
    background: transparent;
  }
  
  .night-vision-toggle:hover {
    background: transparent;
  }
}

/* Header layout adjustment for toggle */
.site-header .container {
  position: relative;
}

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

@media (max-width: 768px) {
  .header-actions {
    gap: var(--space-2);
  }
}

/* --------------------------------------------------------------------------
   Night Vision Mode — Red Light Theme
   Preserves night vision for astrophotographers
   -------------------------------------------------------------------------- */
body.night-vision {
  --nv-bg: #0a0000;
  --nv-bg-elevated: #120000;
  --nv-bg-card: #1a0000;
  --nv-border: #3d0000;
  --nv-border-subtle: #2a0000;
  --nv-text: #cc3333;
  --nv-text-muted: #992222;
  --nv-text-dim: #661a1a;
  --nv-accent: #ff4444;
}

body.night-vision {
  background-color: var(--nv-bg);
  color: var(--nv-text);
}

/* Header in Night Vision */
body.night-vision .site-header {
  background-color: rgba(10, 0, 0, 0.95);
  border-bottom-color: var(--nv-border);
  backdrop-filter: none;
}

body.night-vision .logo {
  color: var(--nv-text);
}

body.night-vision .logo-icon {
  filter: invert(25%) sepia(100%) saturate(2000%) hue-rotate(340deg) brightness(85%);
}

body.night-vision .nav-link {
  color: var(--nv-text-muted);
}

body.night-vision .nav-link:hover,
body.night-vision .nav-link.active {
  color: var(--nv-text);
}

body.night-vision .nav-link.active::after {
  background-color: var(--nv-text);
}

body.night-vision .nav-arrow {
  stroke: currentColor;
}

body.night-vision .nav-dropdown {
  background: var(--nv-bg-elevated);
  border-color: var(--nv-border);
}

body.night-vision .nav-dropdown-link {
  color: var(--nv-text-muted);
}

body.night-vision .nav-dropdown-link:hover {
  background-color: var(--nv-bg-card);
  color: var(--nv-text);
}

body.night-vision .menu-bar {
  background-color: var(--nv-text);
}

/* Mobile nav in Night Vision */
body.night-vision .mobile-nav {
  background: var(--nv-bg);
}

body.night-vision .mobile-nav .nav-item {
  border-bottom-color: var(--nv-border);
}

body.night-vision .mobile-nav .nav-label {
  color: var(--nv-text);
}

body.night-vision .mobile-nav .nav-dropdown-link {
  color: var(--nv-text-muted);
}

body.night-vision .mobile-nav .nav-dropdown-link:hover {
  color: var(--nv-text);
}

/* Night Vision Toggle Active State */
body.night-vision .night-vision-toggle {
  color: var(--nv-accent);
  border-color: var(--nv-accent);
  background: rgba(255, 68, 68, 0.1);
}

body.night-vision .night-vision-toggle:hover {
  background: rgba(255, 68, 68, 0.2);
}

/* Hero in Night Vision */
body.night-vision .page-hero,
body.night-vision .hero,
body.night-vision .home-hero {
  background: linear-gradient(180deg, var(--nv-bg-elevated) 0%, var(--nv-bg) 100%);
  border-bottom-color: var(--nv-border);
}

body.night-vision .hero-eyebrow {
  color: var(--nv-text-dim);
}

body.night-vision .hero-title,
body.night-vision .home-hero-title {
  color: var(--nv-text);
}

body.night-vision .hero-title em {
  background: linear-gradient(135deg, var(--nv-text-muted), var(--nv-text));
  -webkit-background-clip: text;
  background-clip: text;
}

body.night-vision .hero-description,
body.night-vision .home-hero-description {
  color: var(--nv-text-muted);
}

/* Sections in Night Vision */
body.night-vision .section {
  background-color: var(--nv-bg);
}

body.night-vision .ref-section {
  border-bottom-color: var(--nv-border);
}

body.night-vision .ref-section--alt {
  background: var(--nv-bg-elevated);
}

body.night-vision .section-header .section-badge {
  background: var(--nv-bg-card);
  color: var(--nv-text);
  border-color: var(--nv-border);
}

body.night-vision .section-title {
  color: var(--nv-text);
}

body.night-vision .section-subtitle {
  color: var(--nv-text-muted);
}

/* Cards in Night Vision */
body.night-vision .tool-card,
body.night-vision .reference-card,
body.night-vision .guide-card,
body.night-vision .scenario-card,
body.night-vision .quick-ref-card,
body.night-vision .download-card {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
  color: var(--nv-text);
}

body.night-vision .tool-card:hover,
body.night-vision .reference-card:hover {
  border-color: var(--nv-text-dim);
  box-shadow: 0 8px 32px rgba(204, 51, 51, 0.1);
}

body.night-vision .tool-title,
body.night-vision .reference-title,
body.night-vision .guide-title,
body.night-vision .quick-ref-title {
  color: var(--nv-text);
}

body.night-vision .tool-description,
body.night-vision .reference-description,
body.night-vision .guide-description {
  color: var(--nv-text-muted);
}

/* Tables in Night Vision */
body.night-vision .ref-table-container {
  border-color: var(--nv-border);
}

body.night-vision .ref-table th {
  background: var(--nv-bg-elevated);
  color: var(--nv-text-dim);
}

body.night-vision .ref-table td {
  color: var(--nv-text);
  border-bottom-color: var(--nv-border-subtle);
}

body.night-vision .ref-table tbody tr:hover {
  background: var(--nv-bg-card);
}

/* Notes in Night Vision */
body.night-vision .ref-note {
  background: var(--nv-bg-elevated);
  border-left-color: var(--nv-text-dim);
  color: var(--nv-text-muted);
}

body.night-vision .ref-note strong {
  color: var(--nv-text);
}

/* Buttons & Links in Night Vision */
body.night-vision .section-nav-link,
body.night-vision .hero-nav-link {
  background: var(--nv-bg-card);
  border-color: var(--nv-border);
  color: var(--nv-text-muted);
}

body.night-vision .section-nav-link:hover,
body.night-vision .hero-nav-link:hover {
  background: var(--nv-bg-elevated);
  border-color: var(--nv-text-dim);
  color: var(--nv-text);
}

body.night-vision .section-nav-link.active {
  background: var(--nv-text);
  border-color: var(--nv-text);
  color: var(--nv-bg);
}

body.night-vision .section-nav-wrapper {
  background-color: rgba(10, 0, 0, 0.95);
  border-bottom-color: var(--nv-border);
  backdrop-filter: none;
}

/* Tips & Cheat Grid in Night Vision */
body.night-vision .tip-block,
body.night-vision .cheat-item {
  background: var(--nv-bg-elevated);
}

body.night-vision .tip-block-title,
body.night-vision .cheat-term {
  color: var(--nv-text);
}

body.night-vision .tip-list li,
body.night-vision .cheat-answer {
  color: var(--nv-text-muted);
}

/* Badges in Night Vision */
body.night-vision .badge--yes {
  background: rgba(34, 100, 34, 0.3);
  color: #66aa66;
}

body.night-vision .badge--caution {
  background: rgba(100, 80, 20, 0.3);
  color: #aa9944;
}

body.night-vision .badge--no {
  background: rgba(100, 34, 34, 0.3);
  color: #aa6666;
}

body.night-vision .format-badge {
  background: var(--nv-border);
  color: var(--nv-text-muted);
}

body.night-vision .format-badge--pro {
  background: var(--nv-text);
  color: var(--nv-bg);
}

/* Footer in Night Vision */
body.night-vision .site-footer {
  background-color: var(--nv-bg);
  color: var(--nv-text-muted);
}

body.night-vision .footer-brand .logo {
  color: var(--nv-text);
}

body.night-vision .footer-tagline {
  color: var(--nv-text-dim);
}

body.night-vision .footer-nav-title {
  color: var(--nv-text);
}

body.night-vision .footer-nav-list a {
  color: var(--nv-text-muted);
}

body.night-vision .footer-nav-list a:hover {
  color: var(--nv-text);
}

body.night-vision .footer-bottom {
  border-top-color: var(--nv-border);
}

body.night-vision .copyright {
  color: var(--nv-text-dim);
}

/* Scrollbar in Night Vision */
body.night-vision ::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

body.night-vision ::-webkit-scrollbar-track {
  background: var(--nv-bg);
}

body.night-vision ::-webkit-scrollbar-thumb {
  background: var(--nv-border);
  border-radius: 4px;
}

body.night-vision ::-webkit-scrollbar-thumb:hover {
  background: var(--nv-text-dim);
}

/* Selection in Night Vision */
body.night-vision ::selection {
  background: rgba(204, 51, 51, 0.3);
  color: var(--nv-accent);
}