:root {
  --bg-main: #09090B;
  --bg-surface: #121215;
  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --border-line: #27272A;
  
  --card-bg: #121215;
  --card-border: #27272A;
  --card-glow: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --card-glow-hover: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
  --pill-bg: #1C1C20;
  --pill-border: #27272A;
  --pill-text: #D1D5DB;

  --color-accent: #F9FAFB;
  --color-accent-hover: #D1D5DB;

  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'Geist Mono', 'Courier New', Courier, monospace;
  --font-card: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  
  --max-width: 1240px;
  --radius-pill: 9999px;
  --radius-md: 10px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-primary);
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button, input {
  font: inherit;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 3px;
}

.site-header {
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-line);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-name {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

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

.header-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.header-link:hover .header-arrow {
  transform: translate(2px, -2px);
}

.hero {
  padding: 96px 0 64px;
  background-color: var(--bg-main);
  animation: heroEnter 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes heroEnter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  max-width: 860px;
}

.hero-title {
  font-size: clamp(48px, 6.8vw, 88px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 28px;
}

.hero-description {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 40px;
  max-width: 720px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 26px;
  background-color: var(--color-accent);
  color: #0A0A0A;
  font-size: 0.95rem;
  font-weight: 550;
  border-radius: var(--radius-pill);
  transition: background-color 0.18s ease-out, transform 0.18s ease-out;
}

.btn-cta:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.archive-section {
  padding: 64px 0 100px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.search-wrapper {
  position: relative;
  flex: 0 0 auto;
  width: 280px;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 42px;
  padding: 0 20px 0 44px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  outline: none;
  transition: all 0.18s ease;
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.search-input:focus {
  background-color: var(--bg-main);
  border-color: var(--text-primary);
}

.filters-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.custom-select {
  position: relative;
}

#formula-filter {
  width: 170px;
}

#level-filter {
  width: 170px;
}

#year-filter {
  width: 140px;
}

.custom-select-trigger {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  height: 42px;
  padding: 0 14px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.18s ease;
}

.custom-select-trigger:hover {
  background-color: var(--border-line);
}

.custom-select.open .custom-select-trigger {
  border-color: var(--text-primary);
  background-color: var(--bg-main);
}

.custom-select-arrow {
  color: var(--text-secondary);
  transition: transform 0.18s ease;
}

.custom-select.open .custom-select-arrow {
  transform: rotate(180deg);
}

.custom-select-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 180px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  padding: 6px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  z-index: 50;
  display: none;
}

.custom-select.open .custom-select-dropdown {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.custom-select-option {
  padding: 8px 12px;
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: 6px;
  transition: background-color 0.12s ease;
}

.custom-select-option.selected {
  font-weight: 600;
  background-color: transparent;
}

.custom-select-option:hover,
.custom-select-option.selected:hover {
  background-color: var(--bg-surface);
}

.clear-btn {
  display: none;
  align-items: center;
  height: 42px;
  padding: 0 18px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.clear-btn.is-visible {
  display: inline-flex;
}

.clear-btn:hover {
  background-color: var(--border-line);
  color: var(--text-primary);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.result-count {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-left: 0;
}

.result-count strong {
  color: var(--text-primary);
  font-weight: 600;
}

.view-switcher {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
  cursor: pointer;
  user-select: none;
}

.view-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  color: var(--text-secondary);
  background-color: transparent;
  cursor: pointer;
  border: none;
  pointer-events: none;
  transition: color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

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

.view-btn.active {
  color: var(--text-primary);
  background-color: var(--bg-main);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.exam-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-glow);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.2s ease;
}

.exam-card:hover {
  border-color: var(--text-secondary);
  box-shadow: var(--card-glow-hover);
  transform: translateY(-2px);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  background-color: var(--pill-bg);
  border: 1px solid var(--pill-border);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--pill-text);
  line-height: 1.3;
}

.pill-badge--pr {
  background-color: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.28);
  color: #f4f4f5;
}

.pill-badge--pp {
  background-color: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.12);
  color: #9ca3af;
}

.pill-badge--f2023 {
  background-color: rgba(135, 55, 240, 0.16);
  border-color: rgba(135, 55, 240, 0.45);
  color: #d8a5ff;
}

.pill-badge--f2015 {
  background-color: rgba(212, 112, 25, 0.16);
  border-color: rgba(212, 112, 25, 0.45);
  color: #ffb366;
}

.pill-badge--fother {
  background-color: rgba(12, 48, 89, 0.55);
  border-color: rgba(12, 48, 89, 0.9);
  color: #8cc2ff;
}

.card-title {
  font-family: var(--font-card);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.card-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--card-border);
  padding-top: 16px;
  margin-top: 20px;
}

.card-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.18s ease;
}

.card-link:hover {
  background-color: var(--border-line);
  border-color: var(--text-secondary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.card-link:hover .link-arrow-svg {
  transform: translate(2px, -2px);
  color: var(--text-primary);
}

.link-arrow-svg {
  color: var(--text-secondary);
  transition: all 0.18s ease;
  flex-shrink: 0;
}


.no-results {
  display: none;
  padding: 80px 0;
  text-align: center;
}

.no-results-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.no-results-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 36px 0 48px;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-left {
  display: flex;
  align-items: center;
}

.footer-copy-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.footer-copy-link:hover {
  color: var(--text-primary);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-issues-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.issues-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.footer-issues-link:hover {
  color: var(--text-primary);
}

.footer-issues-link:hover .issues-arrow {
  transform: translate(2px, -2px);
}

.exam-grid.view-list {
  grid-template-columns: 1fr;
  gap: 18px;
}

.exam-grid.view-list .exam-card {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  gap: 20px;
  flex-wrap: nowrap;
  border-radius: 14px;
}

.exam-grid.view-list .card-info {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-width: 180px;
}

.exam-grid.view-list .card-meta {
  margin-bottom: 3px;
  font-size: 0.75rem;
}

.exam-grid.view-list .card-title {
  font-size: 1.125rem;
  margin-bottom: 2px;
}

.exam-grid.view-list .card-links {
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.exam-grid.view-list .card-link {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  gap: 8px;
  padding: 8px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: all 0.18s ease;
}

.exam-grid.view-list .card-link:hover {
  background-color: var(--border-line);
  border-color: var(--text-secondary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

@media (max-width: 1024px) {
  .exam-grid:not(.view-list) {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1180px) {
  .toolbar-right {
    margin-left: 0;
    width: 100%;
    justify-content: space-between;
    border-top: 1px solid var(--border-line);
    padding-top: 14px;
  }
}

@media (max-width: 900px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 920px) {
  .exam-grid.view-list .exam-card {
    flex-direction: column;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 14px;
  }

  .exam-grid.view-list .card-info {
    width: 100%;
    min-width: 100%;
  }

  .exam-grid.view-list .card-links {
    width: 100%;
    max-width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .exam-grid:not(.view-list) {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 64px 0 40px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .search-wrapper {
    width: 100%;
    max-width: 100%;
    flex: 0 0 auto;
  }

  .filters-group {
    width: 100%;
  }

  .custom-select,
  #formula-filter,
  #level-filter,
  #year-filter,
  .clear-btn {
    width: 100%;
    flex: 1 1 100%;
  }

  .clear-btn {
    justify-content: center;
  }
}

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