@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,400&family=DM+Mono:wght@400;500&display=swap');

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

:root {
  --bg: #ffffff;
  --bg-secondary: #f7f7f5;
  --text: #0f0f0f;
  --text-secondary: #6b6b6b;
  --text-tertiary: #a0a0a0;
  --border: rgba(0,0,0,0.1);
  --border-hover: rgba(0,0,0,0.2);
  --accent: #0f0f0f;
  --accent-green: #16a34a;
  --radius: 10px;
  --radius-sm: 6px;
  --font: 'DM Sans', system-ui, sans-serif;
  --mono: 'DM Mono', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --text: #f0f0f0;
    --text-secondary: #888;
    --text-tertiary: #555;
    --border: rgba(255,255,255,0.1);
    --border-hover: rgba(255,255,255,0.2);
    --accent: #f0f0f0;
    --accent-green: #4ade80;
  }
}

html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.site {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0 2.5rem;
  border-bottom: 0.5px solid var(--border);
  margin-bottom: 3rem;
}

.logo {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 2px;
}
.logo::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  margin-right: 8px;
  flex-shrink: 0;
}
.logo span { color: var(--text-tertiary); }

.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 0 0 3rem;
  border-bottom: 0.5px solid var(--border);
  margin-bottom: 3rem;
}

.search-container {
  margin-top: 2rem;
  max-width: 500px;
}

.search-input {
  width: 100%;
  font-family: var(--font);
  font-size: 16px;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  outline: none;
  transition: all 0.2s;
}

.search-input:focus {
  border-color: var(--text-tertiary);
  background: var(--bg);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.hero-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: 48px;
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
  color: var(--text);
}
.hero h1 strong {
  font-weight: 600;
  color: var(--accent-green);
}

.hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 500px;
  line-height: 1.65;
}

/* Categories Grid */
.home-categories {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 2rem;
  align-items: start;
}

/* Category sections */
.category-section {
  margin-bottom: 3rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-right: 0.75rem;
}

.section-count {
  font-size: 11px;
  color: var(--text-tertiary);
}

.see-all {
  font-size: 12px;
  color: var(--text-tertiary);
  transition: color 0.15s;
}
.see-all:hover { color: var(--text); }

/* Tools grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.tool-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.tool-card {
  background: var(--bg-secondary);
  padding: 1.35rem;
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  cursor: pointer;
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.tool-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 0.9rem;
}

.tool-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
}

.tool-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Tool page layout */
.tool-page {
  max-width: 700px;
}

.breadcrumb {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 2rem;
}
.breadcrumb a { color: var(--text-tertiary); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span { margin: 0 6px; }

.tool-header {
  margin-bottom: 2rem;
}
.tool-header h1 {
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: var(--accent-green);
}
.tool-header p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Calculator */
.calculator {
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 2rem;
}

.calc-body {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  border-bottom: 0.5px solid var(--border);
}

.calc-body.single-col { grid-template-columns: 1fr; }
.calc-full { grid-column: 1 / -1; }

.field label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 7px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: var(--font);
  font-size: 14px;
  padding: 9px 12px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
}
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: var(--border-hover); }

.field textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
}

.calc-result {
  background: var(--bg-secondary);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.calc-result.two-col { grid-template-columns: repeat(2, 1fr); }
.calc-result.one-col { grid-template-columns: 1fr; }

.result-item {}
.result-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}
.result-value {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}
.result-value.accent { color: var(--accent-green); }

/* Output area (dev tools) */
.output-area {
  background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 80px;
  margin-top: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 0.5px solid var(--border);
  background: var(--bg);
  color: var(--text);
  transition: background 0.12s, border-color 0.12s;
}
.btn:hover { background: var(--bg-secondary); border-color: var(--border-hover); }

.btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn-primary:hover { opacity: 0.85; background: var(--text); }

.btn-group {
  display: flex;
  gap: 8px;
  margin-top: 1rem;
  flex-wrap: wrap;
}

/* Tags / badges */
.tag {
  display: inline-block;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  color: var(--text-tertiary);
}

/* Info box */
.info-box {
  background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-top: 1.5rem;
}
.info-box h3 {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.5rem;
}

/* Footer */
.footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 0.5px solid var(--border);
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 800px) {
  .home-categories { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .site { padding: 0 1.25rem 3rem; }
  .hero h1 { font-size: 28px; }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding-bottom: 1.25rem;
    margin-bottom: 2rem;
  }
  .nav-links {
    gap: 0.5rem 1.25rem;
    flex-wrap: wrap;
  }

  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .calc-body { grid-template-columns: 1fr; }
  .calc-result { grid-template-columns: 1fr 1fr; }
}

/* Unit / locale toggle */
.unit-toggle {
  display: flex;
  justify-content: flex-end;
  padding: 1rem 1.5rem 0;
  gap: 4px;
}
.unit-toggle button {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 0.5px solid var(--border);
  background: var(--bg);
  color: var(--text-secondary);
  transition: all 0.12s;
}
.unit-toggle button.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* Ad slots */
.ad-slot {
  background: var(--bg-secondary);
  border: 0.5px dashed var(--border);
  border-radius: var(--radius);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-tertiary);
  margin: 2rem 0;
}