:root {
  --bg: #f7f5f1;
  --text: #1f1f1f;
  --muted: #5f5f5f;
  --card-bg: #fffaf2;
  --border: #e3e0db;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #fff, var(--bg));
}

img {
  max-width: 100%;
}

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

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 14px;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.page {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 28px 80px;
  width: 100%;
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  align-items: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  margin: 0 0 12px;
}

.hero p {
  color: var(--muted);
  margin: 0 0 18px;
  font-size: 16px;
}

.tool-hero {
  max-width: 760px;
  margin-bottom: 20px;
}

.tool-intro {
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.14);
}

.card-title {
  font-size: 18px;
  margin: 0 0 8px;
}

.card-meta {
  color: var(--muted);
  font-size: 14px;
  margin: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button.primary {
  background: var(--primary-color);
  color: #fff;
  border: none;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.12);
}

.tool-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.input,
.textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 15px;
  background: #fff;
}

.textarea {
  min-height: 140px;
}

.tool-panel {
  margin-top: 24px;
  display: grid;
  gap: 12px;
  max-width: 840px;
}

.tool-message {
  font-size: 14px;
}

.tool-message[data-state="success"] {
  color: var(--primary-color);
}

.tool-message[data-state="error"] {
  color: #b91c1c;
}

.regex-output {
  padding: 12px;
  border: 1px dashed var(--border);
  min-height: 80px;
  white-space: pre-wrap;
  background: #fffdf9;
}

.regex-output mark {
  background: #fde68a;
}

.uuid-row {
  display: flex;
  gap: 12px;
}

.uuid-row input {
  flex: 1;
}

.color-preview {
  height: 64px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}


@media (max-width: 720px) {
  .nav-links {
    display: none;
  }

  .navbar {
    padding: 16px 20px;
  }

  .page {
    padding: 40px 20px 64px;
  }
}