/*
 * DS Tools Database — Modern Editorial Redesign
 * Inspired by design publications: bold typography, dramatic whitespace,
 * magazine-like layouts with striking contrasts
 */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&display=swap');

/* ============================================
   CSS Reset & Custom Properties
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Editorial color palette - cream & ink */
  --color-ink: #1a1814;
  --color-ink-soft: #2d2a26;
  --color-paper: #f7f5f0;
  --color-paper-warm: #ede8df;
  --color-accent: #e63946;
  --color-accent-hover: #c1121f;
  --color-muted: #8a8680;
  --color-border: #d4d0c8;
  --color-card: #ffffff;

  /* Typography scale — dramatic contrast */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing system */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --max-width: 1600px;
  --grid-gap: 1.5rem;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-medium: 300ms;
  --duration-slow: 600ms;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: var(--color-accent);
  color: white;
}

/* ============================================
   Container & Layout
   ============================================ */

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

/* ============================================
   Header — Editorial Masthead
   ============================================ */

.site-header {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(230, 57, 70, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(230, 57, 70, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.site-header .container {
  position: relative;
  z-index: 1;
}

.site-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.site-title span {
  display: inline-block;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) backwards;
}

.site-title span:nth-child(1) { animation-delay: 0.1s; }
.site-title span:nth-child(2) { animation-delay: 0.15s; color: var(--color-accent); }
.site-title span:nth-child(3) { animation-delay: 0.2s; }

.site-subtitle {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
  opacity: 0.7;
  max-width: 40ch;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.3s backwards;
}

.site-subtitle strong {
  color: var(--color-accent);
  font-weight: 600;
}

/* Header decorative elements */
.header-decoration {
  position: absolute;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: clamp(8rem, 20vw, 16rem);
  font-style: italic;
  opacity: 0.03;
  pointer-events: none;
  user-select: none;
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
  padding: var(--space-xl) 0 var(--space-2xl);
}

/* ============================================
   Search Section — Editorial Search Bar
   ============================================ */

.search-section {
  margin-bottom: var(--space-xl);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.4s backwards;
}

.search-container {
  position: relative;
  max-width: 700px;
}

.search-input {
  width: 100%;
  padding: 1.25rem 1.25rem 1.25rem 3.5rem;
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
  border: 2px solid var(--color-ink);
  border-radius: 0;
  background: var(--color-card);
  color: var(--color-ink);
  transition:
    box-shadow var(--duration-medium) var(--ease-out-expo),
    transform var(--duration-medium) var(--ease-out-expo);
}

.search-input:focus {
  outline: none;
  box-shadow: 6px 6px 0 var(--color-ink);
  transform: translate(-3px, -3px);
}

.search-input::placeholder {
  color: var(--color-muted);
  font-style: italic;
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-ink);
  pointer-events: none;
  transition: color var(--duration-fast);
}

.search-input:focus + .search-icon {
  color: var(--color-accent);
}

/* ============================================
   Filters Section — Category Pills
   ============================================ */

.filters-section {
  margin-bottom: var(--space-lg);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.5s backwards;
}

.filters-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.filters-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  font-style: italic;
  color: var(--color-ink);
}

.clear-filters-btn {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  position: relative;
  transition: color var(--duration-fast);
}

.clear-filters-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-sm);
  right: var(--space-sm);
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-medium) var(--ease-out-expo);
}

.clear-filters-btn:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.filter-btn {
  padding: 0.625rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: all var(--duration-medium) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.filter-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-ink);
  transform: translateY(100%);
  transition: transform var(--duration-medium) var(--ease-out-expo);
}

.filter-btn span {
  position: relative;
  z-index: 1;
}

.filter-btn:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.filter-btn.active {
  border-color: var(--color-ink);
  color: var(--color-paper);
}

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

/* ============================================
   Results Section
   ============================================ */

.results-section {
  margin-bottom: var(--space-lg);
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.6s backwards;
}

.results-count {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================
   Tools Grid — Editorial Card Layout
   ============================================ */

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--grid-gap);
}

/* ============================================
   Tool Card — Magazine Style
   ============================================ */

.tool-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  position: relative;
  display: flex;
  flex-direction: column;
  transition:
    transform var(--duration-medium) var(--ease-out-expo),
    box-shadow var(--duration-medium) var(--ease-out-expo);
  animation: cardReveal 0.6s var(--ease-out-expo) backwards;
}

.tool-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 8px 8px 0 var(--color-ink);
}

.tool-card.hidden {
  display: none;
}

/* Staggered card animations */
.tool-card:nth-child(1) { animation-delay: 0.05s; }
.tool-card:nth-child(2) { animation-delay: 0.1s; }
.tool-card:nth-child(3) { animation-delay: 0.15s; }
.tool-card:nth-child(4) { animation-delay: 0.2s; }
.tool-card:nth-child(5) { animation-delay: 0.25s; }
.tool-card:nth-child(6) { animation-delay: 0.3s; }
.tool-card:nth-child(7) { animation-delay: 0.35s; }
.tool-card:nth-child(8) { animation-delay: 0.4s; }
.tool-card:nth-child(9) { animation-delay: 0.45s; }
.tool-card:nth-child(n+10) { animation-delay: 0.5s; }

@keyframes cardReveal {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Card image section */
.tool-image-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--color-paper-warm);
  overflow: hidden;
}

.tool-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-expo);
  filter: grayscale(20%);
}

.tool-card:hover .tool-image {
  transform: scale(1.05);
  filter: grayscale(0%);
}

.tool-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(135deg, var(--color-paper-warm) 0%, var(--color-border) 100%);
  position: relative;
}

.tool-image-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 10px,
      rgba(0,0,0,0.02) 10px,
      rgba(0,0,0,0.02) 20px
    );
}

.tool-image-placeholder span {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 400;
  color: var(--color-muted);
  opacity: 0.4;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

/* Card content section */
.tool-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.tool-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.tool-name a {
  color: var(--color-ink);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  transition: color var(--duration-fast);
}

.tool-name a:hover {
  color: var(--color-accent);
}

.external-link-icon {
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity var(--duration-fast),
    transform var(--duration-medium) var(--ease-out-expo);
  flex-shrink: 0;
}

.tool-name a:hover .external-link-icon {
  opacity: 1;
  transform: translateX(0);
}

.tool-description {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
  margin-bottom: 1.25rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.tool-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.category-tag {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.375rem 0.75rem;
  background: var(--color-paper);
  color: var(--color-muted);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.category-tag:hover {
  background: var(--color-ink);
  color: var(--color-paper);
}

/* ============================================
   No Results State
   ============================================ */

.no-results {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--color-muted);
}

.no-results svg {
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.no-results h3 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}

.no-results p {
  font-family: var(--font-body);
  font-size: 1rem;
  font-style: italic;
}

/* ============================================
   Footer — Editorial Colophon
   ============================================ */

.site-footer {
  padding: var(--space-xl) 0;
  background: var(--color-ink);
  color: var(--color-paper);
  margin-top: auto;
}

.site-footer p {
  font-family: var(--font-body);
  font-size: 0.875rem;
  opacity: 0.6;
  text-align: center;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
  :root {
    --space-xl: 3rem;
    --space-2xl: 4rem;
  }

  .site-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
  }

  .header-decoration {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 3rem;
    --grid-gap: 1rem;
  }

  .site-header {
    padding: var(--space-xl) 0;
  }

  .site-title {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

  .site-subtitle {
    font-size: 1rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .search-input {
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1rem;
  }

  .search-icon {
    left: 1rem;
  }

  .filter-buttons {
    gap: 0.375rem;
  }

  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
  }

  .tool-content {
    padding: 1.25rem;
  }

  .tool-name {
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .tool-image-container {
    aspect-ratio: 16 / 9;
  }

  .filters-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* ============================================
   Hover & Focus States (accessibility)
   ============================================ */

@media (hover: hover) {
  .filter-btn:hover::before {
    transform: translateY(0);
  }

  .filter-btn:hover {
    color: var(--color-paper);
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  .site-header {
    background: white;
    color: black;
    padding: 1rem 0;
  }

  .search-section,
  .filters-section,
  .site-footer {
    display: none;
  }

  .tool-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}