:root {
  color-scheme: light dark;

  --color-red: light-dark(#FF3B30, #FF453A);
  --color-orange: light-dark(#FF9500, #FF9F0A);
  --color-yellow: light-dark(#FFCC00, #FFD60A);
  --color-green: light-dark(#30D158, #30D158);
  --color-mint: light-dark(#00C7BE, #63E6E2);
  --color-teal: light-dark(#30B0C7, #40C8E0);
  --color-cyan: light-dark(#32ADE6, #64D2FF);
  --color-blue: light-dark(#007AFF, #0A84FF);
  --color-indigo: light-dark(#5856D6, #5E5CE6);
  --color-purple: light-dark(#AF52DE, #BF5AF2);
  --color-pink: light-dark(#FF2D55, #FF375F);
  --color-brown: light-dark(#A2845E, #AC8E68);

  --color-gray: #8E8E93;
  --color-gray2: light-dark(#AEAEB2, #636366);
  --color-gray3: light-dark(#C7C7CC, #48484A);
  --color-gray4: light-dark(#D1D1D6, #3A3A3C);
  --color-gray5: light-dark(#E5E5EA, #2C2C2E);
  --color-gray6: light-dark(#F2F2F7, #1C1C1E);

  --color-label: light-dark(#000, #EEE);
  --color-label-secondary: light-dark(
    rgb(60 60 67 / 0.78),
    rgb(235 235 245 / 0.6)
  );
  --color-label-tertiary: light-dark(
    rgb(60 60 67 / 0.5),
    rgb(235 235 245 / 0.3)
  );
  --color-label-quaternary: light-dark(
    rgb(60 60 67 / 0.35),
    rgb(235 235 245 / 0.18)
  );

  --color-link: light-dark(#007AFF, #0984FF);
  --color-separator: light-dark(
    rgb(60 60 67 / 0.1),
    rgb(84 84 88 / 0.65)
  );

  --color-bg: light-dark(#FFF, #111);
  --color-bg-secondary: light-dark(#F2F2F7, #1C1C1E);
  --color-bg-tertiary: light-dark(#FFF, #2C2C2E);
}

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

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--color-label);
  background: var(--color-bg);
  accent-color: var(--color-blue);
  -webkit-font-smoothing: antialiased;
}

main {
  max-inline-size: 540px;
  margin-block-start: 80px;
  margin-inline: auto;
  padding-inline: 20px;
}

.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.search-form {
  display: flex;

  .search-input-wrap {
    flex: 1;
    position: relative;
  }

  .search-icon {
    position: absolute;
    inset-inline-start: 12px;
    inset-block-start: 0;
    block-size: 38px;
    line-height: 38px;
    color: var(--color-label-tertiary);
    font-size: 14px;
    pointer-events: none;
  }

  input {
    inline-size: 100%;
    block-size: 38px;
    padding-inline: 34px 12px;
    border: 1px solid var(--color-separator);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    color: var(--color-label);
    background: var(--color-bg);

    &:focus-visible {
      outline: 2px solid var(--color-blue);
      outline-offset: -1px;
    }

    &::placeholder {
      color: var(--color-label-tertiary);
    }

    &[aria-invalid="true"] {
      border-color: var(--color-red);

      &:focus-visible {
        outline-color: var(--color-red);
      }
    }
  }

  .search-error {
    margin-block-start: 6px;
    font-size: 13px;
    color: var(--color-red);
  }
}

.ip-copy-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

.ip-display {
  text-align: center;
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 200;
  margin-block: 28px 20px;
  letter-spacing: -0.5px;
  overflow-wrap: break-word;
  word-break: break-all;
}

.ip-copied-tooltip {
  position: absolute;
  right: 0;
  top: 50%;
  translate: 0 -50%;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-gray);
  pointer-events: none;
  white-space: nowrap;
  animation: ip-tooltip-fade 1.5s ease-out;
}

@keyframes ip-tooltip-fade {
  0%, 70% { opacity: 1; }
  100% { opacity: 0; }
}

.info-table {
  inline-size: 100%;
  border-collapse: collapse;
  table-layout: fixed;

  th,
  td {
    padding-block: 10px;
    border-block-start: 1px solid var(--color-separator);
    font-size: 15px;
    vertical-align: top;
    overflow-wrap: break-word;
  }

  tr:last-child th,
  tr:last-child td {
    border-block-end: 1px solid var(--color-separator);
  }

  th {
    inline-size: 42%;
    padding-inline: 35px 32px;
    font-weight: 600;
    color: var(--color-label);
    text-align: start;
  }

  .bool-true {
    color: var(--color-green);
  }

  .bool-false {
    color: var(--color-label-secondary);
  }

  a {
    color: var(--color-link);
    text-decoration: none;

    &:hover {
      text-decoration: underline;
    }
  }
}

.faq {
  margin-block-start: 48px;

  .faq-title {
    font-size: 22px;
    font-weight: 600;
    margin-block-end: 16px;
  }

  summary {
    padding-block: 12px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-label);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 4px;

    &::-webkit-details-marker {
      display: none;
    }

    &::before {
      content: "\25B6";
      font-size: 11px;
      color: var(--color-label-secondary);
      flex-shrink: 0;
    }
  }

  details[open] > summary::before {
    content: "\25BC";
  }

  .faq-content {
    padding-block-end: 16px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-label-secondary);

    p {
      margin-block-end: 12px;

      &:last-child {
        margin-block-end: 0;
      }
    }

    a {
      color: var(--color-link);
      text-decoration: none;

      &:hover {
        text-decoration: underline;
      }
    }

    code {
      font-family: ui-monospace, "SF Mono", "Cascadia Code", "Segoe UI Mono", Menlo, Consolas, monospace;
      font-size: 0.9em;
      padding-inline: 4px;
      padding-block: 1px;
      border-radius: 4px;
      background: var(--color-bg-secondary);
    }

    pre {
      margin-block-end: 12px;
      padding: 12px;
      border-radius: 6px;
      background: var(--color-bg-secondary);
      overflow-x: auto;

      &:last-child {
        margin-block-end: 0;
      }

      code {
        padding: 0;
        border-radius: 0;
        background: none;
        font-size: 13px;
        line-height: 1.5;
      }
    }

    ul {
      margin-block-end: 12px;
      padding-inline-start: 20px;

      &:last-child {
        margin-block-end: 0;
      }

      li {
        margin-block-end: 6px;

        &:last-child {
          margin-block-end: 0;
        }
      }
    }
  }
}

.error-banner {
  text-align: center;
  margin-block: 28px;
  padding: 16px 20px;
  border-radius: 8px;
  background: light-dark(#FFF3F3, #3A1C1C);
  border: 1px solid var(--color-red);
  color: var(--color-red);
  font-size: 15px;
  font-weight: 600;
}

.error-page {
  text-align: center;
  padding-block-start: 60px;
}

.error-code {
  font-size: clamp(64px, 15vw, 120px);
  font-weight: 200;
  letter-spacing: -2px;
  color: var(--color-label-tertiary);
  line-height: 1;
}

.error-status {
  font-size: 20px;
  font-weight: 600;
  margin-block-start: 8px;
  color: var(--color-label);
}

.error-detail {
  font-size: 15px;
  margin-block-start: 12px;
  color: var(--color-label-secondary);
}

.error-home-link {
  display: inline-block;
  margin-block-start: 28px;
  padding: 10px 24px;
  border-radius: 8px;
  background: var(--color-blue);
  color: #FFF;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;

  &:hover {
    text-decoration: none;
    opacity: 0.85;
  }
}

.site-footer {
  max-inline-size: 540px;
  margin-block-start: 64px;
  margin-inline: auto;
  padding-inline: 20px;
  padding-block-end: 48px;
  border-block-start: 1px solid var(--color-separator);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-label-secondary);

  .footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    padding-block-start: 24px;
  }

  .footer-left {
    text-align: start;
  }

  .footer-right {
    flex-shrink: 0;
  }

  a {
    color: var(--color-link);
    text-decoration: none;

    &:hover {
      text-decoration: underline;
    }
  }

  .footer-license {
    margin-block-end: 8px;
  }

  .footer-links {
    margin-block-end: 16px;
  }

  .footer-sep {
    margin-inline: 8px;
    color: var(--color-label-tertiary);
  }

  .footer-attribution {
    p {
      margin-block-end: 6px;
      font-size: 11px;
      color: var(--color-gray2);
    }

    a {
      color: var(--color-gray2);
      font-size: 11px;
    }

    ul {
      list-style: none;
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-start;
      gap: 4px 16px;
    }
  }

  .footer-lang {
    margin-block-start: 0;
  }

  .lang-select {
    appearance: none;
    padding: 6px 28px 6px 10px;
    border: 1px solid var(--color-separator);
    border-radius: 6px;
    font-family: inherit;
    font-size: 13px;
    color: var(--color-label-secondary);
    background-color: var(--color-bg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238E8E93'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    cursor: pointer;

    &:focus-visible {
      outline: 2px solid var(--color-blue);
      outline-offset: -1px;
    }
  }
}

[dir="rtl"] .lang-select {
  background-position: left 10px center;
  padding: 6px 10px 6px 28px;
}

@media (width <= 480px) {
  main {
    margin-block-start: 40px;
    padding-inline: 16px;
  }

  .search-form input {
    block-size: 44px;
  }

  .search-form .search-icon {
    block-size: 44px;
    line-height: 44px;
  }

  .ip-display {
    margin-block: 20px 16px;
  }

  .info-table th,
  .info-table td {
    font-size: 14px;
  }

#alt-ip-section {
  margin-block-start: 32px;
}

.faq {
    margin-block-start: 32px;

    summary {
      font-size: 14px;
    }

    .faq-content {
      font-size: 13px;
    }
  }

  .site-footer {
    margin-block-start: 40px;
    padding-inline: 16px;
    padding-block-end: 32px;
    font-size: 12px;

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

    .footer-right {
      order: -1;
    }

    .footer-lang {
      margin-block-start: 0;
      margin-block-end: 16px;
    }
  }

  .error-banner {
    font-size: 14px;
    margin-block: 20px;
  }

  .error-page {
    padding-block-start: 40px;
  }

  .error-status {
    font-size: 18px;
  }

  .error-detail {
    font-size: 14px;
  }
}

@media (width <= 360px) {
  .info-table th {
    inline-size: 36%;
    padding-inline: 12px 16px;
  }
}

@media (prefers-contrast: more) {
  :root {
    --color-separator: light-dark(
      rgb(0 0 0 / 0.5),
      rgb(255 255 255 / 0.5)
    );
    --color-label-secondary: light-dark(
      rgb(0 0 0 / 0.75),
      rgb(255 255 255 / 0.75)
    );
    --color-label-tertiary: light-dark(
      rgb(0 0 0 / 0.5),
      rgb(255 255 255 / 0.5)
    );
  }

  .search-form input {
    border-width: 2px;
  }
}

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