/* ==========================================================================
   CSS Variables & Base Styles
   ========================================================================== */

:root {
  /* Colors */
  --onBackground: #000;
  --background: #fff;
  --github-button-color: #94d2bd;
  --onGithubButton: #000;

  /* Table Colors */
  --tableBody: #eff8f5;
  --tableHeader: #0d7478;
  --onTableHeader: #0d7478;
  --tableBorder: rgba(148, 210, 189, 0.2);
  --tableHover: rgba(148, 210, 189, 0.1);
  --tableRowEven: rgba(148, 210, 189, 0.05);

  /* Rainbow Colors */
  --rainbow1: #ae2012;
  --rainbow2: #bb3e04;
  --rainbow3: #ca6702;
  --rainbow4: #ee9b00;
  --rainbow5: #e9d9a6;
  --rainbow6: #94d2bd;
  --rainbow7: #0a9396;
  --rainbow8: #025f72;
  --onRainbow: #fff;

  /* Spacing */
  --area-padding: 64px;
  --area-padding-mobile: 32px;

  /* Performance optimization: declare commonly used values */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease-in-out;
}

/* Font loading optimization - prevent invisible text */
@font-face {
  font-family: "Domine Fallback";
  src: local("Georgia"), local("Times"), local("serif");
  font-display: swap;
  size-adjust: 95%;
}

@font-face {
  font-family: "Plus Jakarta Sans Fallback";
  src: local("-apple-system"), local("BlinkMacSystemFont"), local("Segoe UI"),
    local("sans-serif");
  font-display: swap;
  size-adjust: 102%;
}

/* ==========================================================================
   Base Elements
   ========================================================================== */

* {
  box-sizing: border-box;
}

body {
  background-color: var(--background);
  color: var(--onBackground);
  font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, sans-serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  /* Performance optimizations */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  /* Reduce layout thrashing */
  contain: layout style;
  /* Ensure consistent font metrics */
  font-display: swap;
  margin: 0;
}

/* Apply web font after it loads */
.fonts-loaded body {
  font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, sans-serif;
}

a {
  color: var(--onBackground);
  text-decoration: none;
  font-weight: 500;
}

h1 {
  font-family: "Domine", Georgia, serif;
  font-optical-sizing: auto;
  font-weight: 500;
  font-style: normal;
  /* Prevent layout shift */
  font-display: swap;
}

h2 {
  line-height: 4rem;
}

p {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  font-size: 1.5rem;
  line-height: 3rem;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.no-top-padding {
  padding-top: 0;
}

/*screen reader only*/
.sr-only {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
}

.logo {
  max-width: 400px;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
}

.nav-links > a {
  font-size: 1.2rem;
}

.github-button {
  background-color: var(--github-button-color);
  color: var(--onGithubButton);
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 4px;
}

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

main {
  display: flex;
  flex-direction: column;
}

/* Header */
header > h1 {
  font-size: clamp(2.5rem, 8vw, 6rem);
  padding-bottom: 0;
  margin: 0;
  line-height: 1.1;
  /* Prevent layout shift */
  min-height: 1.1em;
  /* Use system font until web font loads */
  font-family: Georgia, serif;
  /* Ensure consistent metrics */
  size-adjust: 100%;
}

/* Apply web font after it loads */
.fonts-loaded header > h1 {
  font-family: "Domine", Georgia, serif;
}

/* ==========================================================================
   Rainbow Section
   ========================================================================== */

.rainbow-area {
  display: flex;
  flex-direction: column;
  flex-direction: column-reverse;
}

.rainbow {
  width: 100%;
  height: 18px;
}

.rainbow1 {
  background-color: var(--rainbow1);
  width: 30%;
}
.rainbow2 {
  background-color: var(--rainbow2);
  width: 40%;
}
.rainbow3 {
  background-color: var(--rainbow3);
  width: 50%;
}
.rainbow4 {
  background-color: var(--rainbow4);
  width: 60%;
}
.rainbow5 {
  background-color: var(--rainbow5);
  width: 70%;
}
.rainbow6 {
  background-color: var(--rainbow6);
  width: 80%;
}
.rainbow7 {
  background-color: var(--rainbow7);
  width: 90%;
}
.rainbow8 {
  background-color: var(--rainbow8);
}

/* ==========================================================================
   Middle Content
   ========================================================================== */

.middle-content {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--area-padding);
  padding-bottom: var(--area-padding);
  gap: 32px;
}

.middle-content > p {
  font-size: 1.5rem;
}

.middle-content h2 {
  font-size: 3rem;
  margin: 0;
  font-family: "Domine", serif;
  font-optical-sizing: auto;
  font-weight: 600;
  font-style: normal;
}

/* ==========================================================================
   Table Styles
   ========================================================================== */

.levels-table-section {
  margin-top: 48px;
  overflow-x: auto;
  position: relative;
}

.levels-table-section h3 {
  font-family: "Domine", serif;
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 32px;
  text-align: center;
  color: var(--onBackground);
}

.levels-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 auto;
  background-color: var(--background);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.levels-table caption {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.levels-table thead {
  background: linear-gradient(135deg, var(--rainbow8), var(--rainbow7));
}

.levels-table th,
.levels-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--tableBorder);
}

.levels-table th {
  font-weight: 600;
  color: var(--onRainbow);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.levels-table tbody tr {
  transition: background-color 0.2s ease;
  will-change: background-color;
}

.levels-table tbody tr:hover {
  background-color: var(--tableHover);
}

/* Remove will-change after transition to save memory */
.levels-table tbody tr:not(:hover) {
  will-change: auto;
}

.levels-table tbody tr:nth-child(even) {
  background-color: var(--tableRowEven);
}

.levels-table tbody th {
  font-weight: 700;
  color: var(--rainbow7);
  background-color: var(--tableBody);
  font-size: 1.1rem;
}

.levels-table tbody td {
  color: var(--onBackground);
  line-height: 1.5;
}

/* Sticky first column */
.levels-table th:first-child,
.levels-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 10;
  background-color: var(--background);
}

.levels-table thead th:first-child {
  background: linear-gradient(
    135deg,
    var(--rainbow8),
    var(--rainbow7)
  ) !important;
  z-index: 11;
}

.levels-table tbody th:first-child {
  background-color: var(--tableBody);
  color: var(--onTableHeader);
  z-index: 10;
}

.levels-table tbody tr:nth-child(even) td:first-child {
  background-color: var(--background) !important;
}

.levels-table tbody tr:hover td:first-child {
  background-color: var(--background) !important;
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  display: flex;
  align-items: center;
  justify-content: center;
}

footer > a {
  width: fit-content;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

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

@media (min-width: 768px) {
  .mobile {
    display: none;
  }
  .desktop {
    display: block;
  }
  main,
  .area-padding {
    padding: var(--area-padding);
  }
}

@media (max-width: 768px) {
  .mobile {
    display: block;
  }
  .desktop {
    display: none;
  }

  header > h1 {
    font-size: clamp(2rem, 10vw, 4rem);
    line-height: 1.1;
    min-height: 1.1em;
  }

  main,
  .area-padding {
    padding: var(--area-padding-mobile);
  }

  .middle-content {
    flex-direction: column;
    align-items: center;
  }

  .middle-content h2 {
    font-size: 2rem;
    line-height: 3rem;
  }

  .middle-content > p {
    font-size: 1.5rem;
  }

  .levels-table-section h3 {
    font-size: 2rem;
    margin-bottom: 24px;
  }

  .levels-table th,
  .levels-table td {
    padding: 12px 16px;
    font-size: 0.9rem;
  }

  .levels-table {
    font-size: 0.85rem;
  }

  .levels-table {
    display: table;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    width: 100%;
  }

  .levels-table th,
  .levels-table td {
    padding: 10px 12px;
    min-width: 120px;
  }

  .levels-table th:first-child,
  .levels-table td:first-child {
    min-width: 80px;
    position: sticky;
    left: 0;
    z-index: 10;
  }

  .levels-table thead th:first-child {
    background: linear-gradient(135deg, var(--rainbow8), var(--rainbow7));
    z-index: 11;
  }

  .levels-table tbody th:first-child {
    background-color: #eff8f5; /*yeah I know leave it alone */
    z-index: 10;
  }
}

/* ==========================================================================
   Dark Mode
   ========================================================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --onBackground: #fff;
    --background: #000;
    --area-padding: 64px;
    --area-padding-mobile: 32px;

    --github-button-color: #94d2bd;
    --onGithubButton: #000;

    --tableBody: #edd1cd;
    --tableHeader: invert(#0d7478);
    --onTableHeader: #000;
    --tableBorder: rgba(148, 210, 189, 0.2);
    --tableHover: invert(rgba(148, 210, 189, 0.1));
    --tableRowEven: invert(rgba(148, 210, 189, 0.05));

    --rainbow1: #00d3e3;
    --rainbow2: #00bce6;
    --rainbow3: #0794df;
    --rainbow4: #0061cf;
    --rainbow5: #142556;
    --rainbow6: #652c41;
    --rainbow7: #ca6966;
    --rainbow8: #e19e8c;
    --onRainbow: #000;
  }

  img {
    filter: invert(1); /*yeah I know, fine for now */
  }
}

/* ==========================================================================
   Cookie Banner
   ========================================================================== */

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--background);
  border-top: 2px solid var(--rainbow6);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: 20px;
  transform: translateY(100%);
  transition: transform 0.3s ease-in-out;
  will-change: transform;
  /* Force hardware acceleration */
  transform: translate3d(0, 100%, 0);
}

.cookie-banner.show {
  transform: translate3d(0, 0, 0);
}

.cookie-content {
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cookie-text p {
  font-size: 1.5rem;
  line-height: 1.5;
  margin: 0;
  color: var(--onBackground);
  opacity: 0.9;
}

.cookie-text a {
  color: var(--rainbow7);
  text-decoration: underline;
  font-weight: 500;
}

.cookie-text a:hover {
  color: var(--rainbow8);
}

.cookie-actions {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.cookie-btn {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-family: var(--font-primary, "Plus Jakarta Sans", sans-serif);
  font-size: 1.5rem;
  font-weight: 500;
  cursor: pointer;
  /* Optimize transitions for compositing */
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
  /* Prepare for hardware acceleration */
  will-change: transform;
}

.cookie-btn-primary {
  background: linear-gradient(135deg, var(--rainbow7), var(--rainbow8));
  color: var(--onRainbow);
}

.cookie-btn-primary:hover {
  /* Use translate3d for hardware acceleration */
  transform: translate3d(0, -1px, 0);
  box-shadow: 0 4px 12px rgba(10, 147, 150, 0.3);
}

/* Clean up will-change when not hovering */
.cookie-btn:not(:hover):not(:focus) {
  will-change: auto;
}

.cookie-btn-secondary {
  background: transparent;
  color: var(--onBackground);
  border: 1px solid var(--tableBorder);
}

.cookie-btn-secondary:hover {
  background: var(--tableHover);
  border-color: var(--rainbow6);
}

/* Responsive Cookie Banner */
@media (max-width: 768px) {
  .cookie-banner {
    padding: 16px;
  }

  .cookie-content {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .cookie-text h3 {
    font-size: 1.1rem;
  }

  .cookie-text p {
    font-size: 0.9rem;
  }

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

  .cookie-btn {
    flex: 1;
    max-width: 150px;
  }
}

@media (max-width: 480px) {
  .cookie-banner {
    padding: 12px;
  }

  .cookie-text h3 {
    font-size: 1rem;
  }

  .cookie-text p {
    font-size: 0.85rem;
  }

  .cookie-actions {
    flex-direction: column;
    gap: 8px;
  }

  .cookie-btn {
    max-width: none;
    width: 100%;
  }
}