/* ==========================================================================
   Base Styles - Body, Typography, Page Layouts
   ========================================================================== */

/* ========================================================================
   HTML & Body
   ======================================================================== */
html {
  font-family: var(--font-sans);
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-canvas);
  background: var(--color-canvas-alt);
  color: var(--color-ink);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
}

/* ========================================================================
   Typography
   ======================================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-ink);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-colors);
}

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

strong, b {
  font-weight: var(--font-bold);
}

em, i {
  font-style: italic;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-gray-100);
  padding: 0.125rem 0.25rem;
  border-radius: var(--radius-sm);
}

.dark code,
html.dark code {
  background-color: var(--color-slate-800);
}

/* ========================================================================
   Selection
   ======================================================================== */
::selection {
  background-color: var(--color-pink-200);
  color: var(--color-pink-900);
}

.dark ::selection,
html.dark ::selection {
  background-color: var(--color-pink-700);
  color: var(--color-pink-100);
}

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

/* ========================================================================
   Grid Patterns
   ======================================================================== */
.bg-grid-light {
  background-image:
    linear-gradient(90deg, rgba(139, 92, 246, 0.15) 1px, transparent 1px),
    linear-gradient(0deg, rgba(139, 92, 246, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(236, 72, 153, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(236, 72, 153, 0.08) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 40px 40px, 40px 40px;
  background-color: #f7f4ff;
  background-position: 0 0, 0 0, 0 0, 0 0;
}

.bg-grid-dark {
  background-image:
    linear-gradient(90deg, rgba(139, 92, 246, 0.25) 1px, transparent 1px),
    linear-gradient(0deg, rgba(139, 92, 246, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167, 139, 250, 0.15) 1px, transparent 1px),
    linear-gradient(0deg, rgba(167, 139, 250, 0.15) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 40px 40px, 40px 40px;
  background-color: #0b1220;
  background-position: 0 0, 0 0, 0 0, 0 0;
}

.grid-pattern {
  position: relative;
  background-image:
    linear-gradient(to right, rgba(0, 0, 255, 0.2) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 255, 0.2) 1px, transparent 1px);
  background-size: 40px 40px;
}

.dark .grid-pattern,
html.dark .grid-pattern {
  background-image:
    linear-gradient(to right, rgba(59, 130, 246, 0.3) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(59, 130, 246, 0.3) 1px, transparent 1px);
}

/* Paper texture */
.paper-texture {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.4'/%3E%3C/svg%3E");
  background-blend-mode: overlay;
}

/* ========================================================================
   Page Layout Components
   ======================================================================== */

/* Page wrapper */
.page {
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--color-gray-100);
}

.page__wrapper {
  min-height: 100vh;
  min-height: 100dvh;
}

/* Header - Unified design with single background */
.header {
  position: relative;
  z-index: var(--z-fixed);
  background: linear-gradient(180deg, 
    oklch(22% 0.04 280 / 0.98) 0%, 
    oklch(20% 0.05 300 / 0.98) 50%, 
    oklch(18% 0.04 320 / 0.98) 100%);
  border-left: var(--border-retro) solid var(--color-border-dark-default);
  border-right: var(--border-retro) solid var(--color-border-dark-default);
  border-bottom: var(--border-retro) solid oklch(40% 0.15 320);
  box-shadow: 0 4px 20px oklch(0% 0 0 / 0.4), 0 2px 8px oklch(50% 0.2 320 / 0.3);
}

/* Light mode header */
html:not(.dark) .header {
  background: linear-gradient(180deg, 
    var(--color-pastel-cream) 0%, 
    var(--color-pastel-pink) 50%, 
    var(--color-pastel-blue) 100%);
  border-color: var(--color-shadow-light);
  border-bottom-color: oklch(70% 0.15 320);
  box-shadow: 0 4px 20px oklch(0% 0 0 / 0.15), 0 2px 8px oklch(70% 0.15 320 / 0.3);
}

@media (prefers-color-scheme: light) {
  html:not(.dark) .header {
    background: linear-gradient(180deg, 
      var(--color-pastel-cream) 0%, 
      var(--color-pastel-pink) 50%, 
      var(--color-pastel-blue) 100%);
    border-color: var(--color-shadow-light);
    border-bottom-color: oklch(70% 0.15 320);
  }
}

.header--fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

/* Flex column layout for header content */
.header__content {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Header inner - no background, inherits from parent */
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  box-shadow: none;
  margin-bottom: 0;
}

.dark .header__inner,
html.dark .header__inner {
  background: transparent;
  border: none;
  box-shadow: none;
}

@media (prefers-color-scheme: dark) {
  .header__inner {
    background: transparent;
    border: none;
    box-shadow: none;
  }
}

/* Mobile responsive for header */
@media (max-width: 640px) {
  .header__bottom {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xs);
    padding: var(--space-xs);
  }
  
  .header__film-strip {
    padding: var(--space-xs);
  }
}

.dark .header__bottom,
html.dark .header__bottom {
  border-top: none;
}

/* Header Date Bar - transparent, part of unified header */
.header__date-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  box-shadow: none;
}

.dark .header__date-bar,
html.dark .header__date-bar {
  background: transparent;
  border: none;
  box-shadow: none;
}

/* Date input - elegant glass effect with square shape */
.header__date-input {
  background: oklch(100% 0 0 / 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid oklch(100% 0 0 / 0.3);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-lg);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: oklch(95% 0 0);
  text-align: center;
  min-width: 200px;
  box-shadow: 0 2px 8px oklch(0% 0 0 / 0.2), inset 0 1px 0 oklch(100% 0 0 / 0.2);
  transition: all 0.2s ease;
}

.header__date-input::placeholder {
  color: oklch(80% 0 0 / 0.7);
}

.header__date-input:hover {
  background: oklch(100% 0 0 / 0.2);
  border-color: oklch(100% 0 0 / 0.4);
}

.header__date-input:focus {
  outline: none;
  background: oklch(100% 0 0 / 0.25);
  border-color: oklch(75% 0.15 320);
  box-shadow: 0 0 0 3px oklch(75% 0.15 320 / 0.3), 0 4px 12px oklch(0% 0 0 / 0.3);
}

/* Light mode date input */
html:not(.dark) .header__date-input {
  background: oklch(100% 0 0 / 0.7);
  border: 1px solid oklch(70% 0.1 320 / 0.5);
  color: oklch(25% 0.05 280);
  box-shadow: 0 2px 8px oklch(0% 0 0 / 0.1), inset 0 1px 0 oklch(100% 0 0 / 0.5);
}

html:not(.dark) .header__date-input::placeholder {
  color: oklch(50% 0.05 280 / 0.7);
}

html:not(.dark) .header__date-input:hover {
  background: oklch(100% 0 0 / 0.85);
  border-color: oklch(70% 0.15 320 / 0.7);
}

html:not(.dark) .header__date-input:focus {
  background: oklch(100% 0 0 / 0.95);
  border-color: oklch(60% 0.2 320);
  box-shadow: 0 0 0 3px oklch(70% 0.15 320 / 0.3), 0 4px 12px oklch(0% 0 0 / 0.15);
}

.dark .header__date-input,
html.dark .header__date-input {
  background: oklch(100% 0 0 / 0.1);
  color: oklch(95% 0 0);
  border: 1px solid oklch(100% 0 0 / 0.2);
  box-shadow: 0 2px 8px oklch(0% 0 0 / 0.3), inset 0 1px 0 oklch(100% 0 0 / 0.1);
}

@media (min-width: 640px) {
  .header__inner {
    padding: var(--space-md) var(--space-lg);
  }
}

@media (min-width: 1024px) {
  .header__inner {
    padding: var(--space-md) var(--space-xl);
  }
}

/* Header Logo - FastRetro style */
.header__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-retro-sm);
  background: var(--gradient-retro-rainbow);
  color: var(--color-shadow-light);
  font-weight: var(--font-black);
  font-size: var(--text-lg);
  border: var(--border-retro-thick) solid var(--color-shadow-light);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-light);
}

@media (min-width: 640px) {
  .header__logo {
    width: 3rem;
    height: 3rem;
    font-size: var(--text-xl);
  }
}

.dark .header__logo,
html.dark .header__logo {
  background: linear-gradient(135deg, oklch(75% 0.14 95), oklch(70% 0.16 350), oklch(70% 0.12 230));
  border-color: var(--color-border-dark-default);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-dark-default);
}

/* Header Title */
.header__title {
  font-weight: var(--font-black);
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-tight);
  background: linear-gradient(to right, 
    oklch(55% 0.22 350), 
    oklch(50% 0.22 285), 
    oklch(50% 0.2 265)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 640px) {
  .header__title {
    font-size: var(--text-2xl);
  }
}

.dark .header__title,
html.dark .header__title {
  background: linear-gradient(to right, 
    oklch(75% 0.2 350), 
    oklch(75% 0.18 285), 
    oklch(75% 0.16 265)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Header Subtitle */
.header__subtitle {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  font-weight: var(--font-medium);
}

.dark .header__subtitle,
html.dark .header__subtitle {
  color: var(--color-gray-400);
}

/* Header Center - View Toggle */
.header__center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: none;
}

@media (min-width: 640px) {
  .header__center {
    display: block;
  }
}

/* View Toggle Buttons - FastRetro style */
.view-toggle {
  display: inline-flex;
  gap: var(--space-xs);
  padding: var(--space-xs);
  background: oklch(98% 0.01 0);
  border-radius: var(--radius-retro);
  border: var(--border-retro) solid var(--color-shadow-light);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-light);
}

.dark .view-toggle,
html.dark .view-toggle {
  background: oklch(22% 0.02 260);
  border-color: var(--color-border-dark-default);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-dark-default);
}

.view-toggle__btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-gray-600);
  background: transparent;
  border: none;
  border-radius: var(--radius-retro-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.view-toggle__btn:hover {
  color: var(--color-gray-800);
  background: var(--color-pastel-cream);
}

.view-toggle__btn--active {
  color: var(--color-shadow-light);
  background: var(--gradient-retro-rainbow);
  border: 2px solid var(--color-shadow-light);
  box-shadow: inset var(--shadow-retro-xs) oklch(0% 0 0 / 0.1);
}

.view-toggle__btn--active:hover {
  color: var(--color-shadow-light);
}

/* Dark mode view toggle buttons */
.dark .view-toggle__btn,
html.dark .view-toggle__btn {
  color: var(--color-gray-400);
}

.dark .view-toggle__btn:hover,
html.dark .view-toggle__btn:hover {
  color: var(--color-gray-200);
  background: oklch(28% 0.03 260);
}

.dark .view-toggle__btn--active,
html.dark .view-toggle__btn--active {
  color: oklch(15% 0.02 260);
  background: linear-gradient(90deg, oklch(75% 0.14 95), oklch(70% 0.16 350), oklch(70% 0.12 230));
  border-color: var(--color-shadow-dark);
}

.dark .view-toggle__btn--active:hover,
html.dark .view-toggle__btn--active:hover {
  color: oklch(15% 0.02 260);
}

/* Legacy Logo classes (FastRetro style for compatibility) */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-retro-sm);
  background: var(--gradient-retro-rainbow);
  color: var(--color-shadow-light);
  font-weight: var(--font-black);
  font-size: var(--text-lg);
  border: var(--border-retro-thick) solid var(--color-shadow-light);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-light);
}

@media (min-width: 640px) {
  .logo__icon {
    width: 3rem;
    height: 3rem;
    font-size: var(--text-xl);
  }
}

.dark .logo__icon,
html.dark .logo__icon {
  background: linear-gradient(135deg, oklch(75% 0.14 95), oklch(70% 0.16 350), oklch(70% 0.12 230));
  border-color: var(--color-border-dark-default);
  box-shadow: var(--shadow-retro-sm) var(--color-shadow-dark-default);
}

.logo__text {
  display: flex;
  flex-direction: column;
}

.logo__title {
  font-weight: var(--font-black);
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-tight);
  background: var(--gradient-text-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 640px) {
  .logo__title {
    font-size: var(--text-2xl);
  }
}

.logo__subtitle {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-weight: var(--font-medium);
}

/* Main content */
.main {
  flex: 1;
  padding-bottom: var(--space-sm);
  padding-top: 7rem; /* Account for fixed header */
}

.main--with-header {
  padding-top: 7rem;
}

@media (min-width: 640px) {
  .main,
  .main--with-header {
    padding-top: 8rem;
  }
}

.main__inner {
  max-width: var(--container-xl);
  margin: 0 auto;
  position: relative;
  z-index: var(--z-10);
}

.main__content {
  padding: var(--space-sm);
}

@media (min-width: 640px) {
  .main__content {
    padding: var(--space-sm) var(--space-md);
  }
}

@media (min-width: 768px) {
  .main__content {
    padding: var(--space-md);
  }
}

@media (min-width: 1024px) {
  .main__content {
    padding: var(--space-md) var(--space-lg);
  }
}

/* ========================================================================
   Visibility Helpers
   ======================================================================== */

/* Hide on mobile, show on larger screens */
.hidden-mobile {
  display: none;
}

@media (min-width: 640px) {
  .hidden-mobile {
    display: flex;
  }
}

/* Hide on tablet and below */
.hidden-tablet {
  display: none;
}

@media (min-width: 1024px) {
  .hidden-tablet {
    display: inline;
  }
}

/* Toggle button - fixed position */
.toggle-btn--fixed {
  position: fixed;
  bottom: var(--space-md);
  left: var(--space-md);
  font-size: var(--text-2xl);
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: oklch(100% 0 0 / 0.9);
}

.dark .toggle-btn--fixed,
html.dark .toggle-btn--fixed {
  background-color: oklch(15% 0.02 260 / 0.9);
}

/* ========================================================================
   Text Color Utilities
   ======================================================================== */
.text--muted {
  color: var(--color-ink-muted);
}

.text--faint {
  color: var(--color-ink-faint);
}

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

.text--white {
  color: var(--color-white);
}

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

/* ========================================================================
   Link Styles
   ======================================================================== */
.link {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-colors);
}

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

.link--muted {
  color: var(--color-ink-muted);
}

.link--muted:hover {
  color: var(--color-ink);
}