:root {
  color-scheme: dark;
  --bg: #0c1016;
  --bg-soft: #111827;
  --panel: rgba(17, 24, 39, 0.82);
  --panel-strong: #172033;
  --text: #f5f7fb;
  --muted: #aeb8c8;
  --border: rgba(255, 255, 255, 0.11);
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --radius-lg: 28px;
  --radius-sm: 999px;
  --focus: 0 0 0 4px rgba(125, 211, 252, 0.25);
  --max-width: 1120px;
}

body.light {
  color-scheme: light;
  --bg: #f6f8fb;
  --bg-soft: #ffffff;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-strong: #ffffff;
  --text: #101827;
  --muted: #566274;
  --border: rgba(16, 24, 39, 0.12);
  --accent: #0369a1;
  --accent-strong: #0284c7;
  --shadow: 0 24px 80px rgba(16, 24, 39, 0.12);
  --focus: 0 0 0 4px rgba(2, 132, 199, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 34rem),
    radial-gradient(circle at top right, rgba(129, 140, 248, 0.14), transparent 30rem),
    var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

body.light {
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 34rem),
    radial-gradient(circle at top right, rgba(129, 140, 248, 0.13), transparent 30rem),
    var(--bg);
}

button,
a {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link,
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 20;
  width: auto;
  height: auto;
  transform: translateY(-150%);
  clip: auto;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  color: var(--bg);
  background: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
  outline: none;
  box-shadow: var(--focus);
}

.site-header,
.page-shell,
.site-footer {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.site-header {
  padding: 1.25rem 0 2.5rem;
  text-align: center;
}

.toolbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: clamp(2.5rem, 8vw, 5rem);
}

.language-switcher {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.control-button {
  display: inline-grid;
  place-items: center;
  min-width: 2.65rem;
  min-height: 2.65rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.42rem;
  color: var(--text);
  background: transparent;
  font-weight: 800;
  line-height: 1;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.flag-button span {
  font-size: 1.3rem;
}

.theme-icon {
  font-size: 1.25rem;
}

.control-button:hover,
.control-button:focus-visible,
.control-button.active {
  border-color: var(--border);
  background: var(--panel-strong);
  transform: translateY(-1px);
}

.control-button:focus-visible,
.tool-card:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.theme-toggle {
  border-color: var(--border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header h1 {
  margin: 0;
  font-size: clamp(2.8rem, 9vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.08em;
}

.tagline {
  max-width: 680px;
  margin: 1.1rem auto 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.25rem);
}

.page-shell {
  padding-bottom: 3rem;
}

.section-title {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.tool-card {
  position: relative;
  display: block;
  min-height: 190px;
  border-radius: var(--radius-lg);
  color: var(--text);
  text-decoration: none;
  perspective: 1200px;
  -webkit-perspective: 1200px;
  transform: translateZ(0);
}

.tool-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: inherit;
  border-radius: inherit;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 680ms cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: transform;
}

.tool-card:hover .tool-card-inner,
.tool-card:focus-visible .tool-card-inner,
.tool-card:focus-within .tool-card-inner,
.tool-card.is-flipped .tool-card-inner {
  transform: rotateY(180deg);
}

.tool-card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: inherit;
  padding: 1.25rem;
  background: linear-gradient(145deg, var(--panel), rgba(125, 211, 252, 0.08));
  box-shadow: var(--shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: opacity 180ms ease, filter 220ms ease;
}

.tool-card-face::after {
  content: "";
  position: absolute;
  right: -3rem;
  bottom: -3rem;
  width: 8rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(125, 211, 252, 0.14);
  pointer-events: none;
}

.tool-card-front {
  justify-content: flex-start;
  transform: rotateY(0deg) translateZ(0.1px);
  opacity: 1;
}

.tool-card-back {
  transform: rotateY(180deg) translateZ(0.1px);
  opacity: 0;
  background: linear-gradient(145deg, var(--panel-strong), rgba(56, 189, 248, 0.14));
}

.tool-card:hover .tool-card-front,
.tool-card:focus-visible .tool-card-front,
.tool-card:focus-within .tool-card-front,
.tool-card.is-flipped .tool-card-front {
  opacity: 0;
}

.tool-card:hover .tool-card-back,
.tool-card:focus-visible .tool-card-back,
.tool-card:focus-within .tool-card-back,
.tool-card.is-flipped .tool-card-back {
  opacity: 1;
}

.tool-domain,
.tool-description,
.tool-open {
  position: relative;
  z-index: 1;
  transform: translateZ(40px);
}

.tool-domain {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.tool-description {
  margin: 0;
  color: var(--muted);
}

.tool-open {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent);
  font-weight: 800;
}

.about-panel {
  margin-top: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.35rem, 3vw, 2rem);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.about-panel h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  letter-spacing: -0.04em;
}

.about-copy {
  max-width: 850px;
}

.about-copy p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  padding: 1.5rem 0 2.2rem;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

@media (max-width: 820px) {
  .toolbar {
    justify-content: center;
    flex-wrap: wrap;
  }

  .tools-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-header,
  .page-shell,
  .site-footer {
    width: min(100% - 1.2rem, var(--max-width));
  }

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

  .tool-card {
    min-height: 175px;
  }
}

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

  .tool-card-inner {
    transition: none;
  }
}