:root {
  --bg-0: #ebebeb;
  --bg-1: #ffffff;
  --bg-2: #f4f4f2;
  --bg-3: #e7e7e4;
  --line: rgba(0, 0, 0, 0.1);
  --line-strong: rgba(0, 0, 0, 0.18);
  --text-hi: #1a1a1c;
  --text: #3a3a40;
  --text-lo: #5e5e66;
  --accent: #ff3b30;
  --accent-hover: #ff5c52;
  --accent-soft: rgba(255, 59, 48, 0.12);
  --r-s: 4px;
  --r-m: 10px;
  --r-l: 22px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --tool-width: 1200px;

  --bg-dark: var(--bg-0);
  --text-main: var(--text);
  --text-muted: var(--text-lo);
  --text-topline: var(--text-lo);
  --text-p: var(--text-hi);
  --grid-line: var(--line);
  --font-logo: "Bebas Neue", sans-serif;
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-tech: "JetBrains Mono", monospace;
}

html,
body.tool-page {
  background: var(--bg-0);
}

body.tool-page {
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  padding-bottom: 0;
}

.tool-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1.15rem 1.5rem 1.15rem max(1.25rem, 5vw);
  box-sizing: border-box;
  background: rgba(235, 235, 235, 0.88);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  backdrop-filter: blur(16px) saturate(1.15);
  border-bottom: 1px solid rgba(26, 26, 28, 0.06);
}

.tool-nav-logo {
  font-family: var(--font-logo);
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--text-hi);
  opacity: 0.9;
  text-decoration: none;
}

.tool-nav-logo:hover {
  opacity: 1;
  color: var(--text-hi);
}

.tool-nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: rgba(26, 26, 28, 0.08);
  border: 1px solid rgba(26, 26, 28, 0.08);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  backdrop-filter: blur(16px) saturate(1.15);
}

.tool-nav-links a {
  position: relative;
  font-family: var(--font-tech);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-hi);
  opacity: 0.55;
  padding: 0.55rem 0.7rem;
  transition: opacity 0.2s var(--ease), color 0.2s var(--ease);
}

.tool-nav-links a:hover,
.tool-nav-links a.is-active {
  opacity: 1;
  color: var(--accent);
}

.tool-nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.28rem;
  height: 1px;
  background: var(--accent);
}

.tool-shell {
  min-height: calc(100vh - 4.6rem);
  padding: 1.75rem 1.25rem 4.5rem;
  background: var(--bg-0);
  box-sizing: border-box;
}

.tool-content {
  width: min(var(--tool-width), 100%);
  margin: 0 auto;
}

.tool-intro {
  margin: 0 0 1.75rem;
}

.tool-kicker {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.7rem;
  font-family: var(--font-tech);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-lo);
}

.tool-kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(255, 59, 48, 0.65);
  flex-shrink: 0;
}

.tool-intro h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-logo);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 0.9;
  font-size: clamp(3rem, 6vw, 4.4rem);
  color: var(--text-hi);
}

.tool-intro p,
.tool-status {
  margin: 0;
  max-width: 42rem;
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text);
}

.tool-status {
  margin-top: 0.85rem;
  font-family: var(--font-tech);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-lo);
}

.tool-card {
  width: 100%;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  padding: 1.5rem 1.6rem;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.04);
}

@media (max-width: 720px) {
  .tool-nav {
    flex-wrap: wrap;
    padding: 0.9rem 1rem;
  }

  .tool-nav-logo {
    font-size: 1.7rem;
  }

  .tool-nav-links {
    width: 100%;
    max-width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
    padding: 0.2rem 0.35rem;
  }

  .tool-nav-links a {
    font-size: 0.64rem;
    letter-spacing: 0.04em;
    padding: 0.5rem 0.35rem;
  }

  .tool-nav-links a.is-active::after {
    left: 0.35rem;
    right: 0.35rem;
  }

  .tool-shell {
    padding: 1.25rem 1rem 3rem;
  }
}