/* ============================================================
   ToolHub — main.css
   Sharp editorial aesthetic. Fast. Clean. Trustworthy.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600&family=DM+Mono:wght@400;500&display=swap');

:root {
  --font-body: 'Instrument Sans', system-ui, sans-serif;
  --font-mono: 'DM Mono', monospace;

  --c-bg: #fafaf9;
  --c-surface: #ffffff;
  --c-border: #e5e3de;
  --c-border-strong: #cccac4;
  --c-text: #1a1917;
  --c-muted: #706e68;
  --c-faint: #b8b5ae;
  --c-accent: #2563eb;
  --c-accent-light: #eff3ff;
  --c-success: #16a34a;
  --c-warn: #d97706;
  --c-danger: #dc2626;
  --c-ai: #7c3aed;
  --c-ai-light: #f3effe;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);

  --nav-h: 56px;
  --content-w: 860px;
  --wide-w: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #131211;
    --c-surface: #1e1c1a;
    --c-border: #2d2b28;
    --c-border-strong: #3d3b37;
    --c-text: #f0ede8;
    --c-muted: #9e9b94;
    --c-faint: #5a5852;
    --c-accent: #60a5fa;
    --c-accent-light: #1e2a3d;
    --c-ai: #a78bfa;
    --c-ai-light: #1e1a2d;
  }
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; }

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 20px;
}
main { flex: 1; }

/* ── Header ─────────────────────────────────────────────────── */
.site-header {
  height: var(--nav-h);
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  height: 100%;
  max-width: var(--wide-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.3px;
  color: var(--c-text);
  text-decoration: none;
}
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--c-muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--c-text); background: var(--c-border); }

/* ── Breadcrumb ─────────────────────────────────────────────── */
.breadcrumb-bar {
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
  padding: 8px 0;
}
.breadcrumb-bar .container {
  font-size: 13px;
  color: var(--c-muted);
  display: flex;
  gap: 6px;
  align-items: center;
}
.breadcrumb-bar a { color: var(--c-muted); }
.breadcrumb-bar a:hover { color: var(--c-text); }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--c-border);
}
.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 600;
  letter-spacing: -.5px;
  line-height: 1.1;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 18px;
  color: var(--c-muted);
  margin-bottom: 32px;
  max-width: 480px;
}

/* ── Category links ─────────────────────────────────────────── */
.category-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.cat-link {
  display: flex;
  flex-direction: column;
  padding: 10px 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-surface);
  color: var(--c-text);
  text-decoration: none;
  transition: border-color .15s, box-shadow .15s;
}
.cat-link:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.cat-link strong { font-size: 14px; font-weight: 600; }
.cat-link span { font-size: 12px; color: var(--c-muted); margin-top: 2px; }

/* ── Tool grid ──────────────────────────────────────────────── */
.popular-tools { padding: 48px 0; }
.popular-tools h2,
.related-tools h2 { font-size: 20px; font-weight: 600; margin-bottom: 20px; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.tool-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-text);
  text-decoration: none;
  transition: border-color .15s, transform .1s, box-shadow .15s;
}
.tool-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.tool-card__name { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.tool-card__tag { font-size: 12px; color: var(--c-muted); line-height: 1.4; }

/* ── Tool page ───────────────────────────────────────────────── */
.page-main { padding: 32px 0 64px; }

.tool-hero {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 32px;
}
.tool-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: -.3px;
  margin-bottom: 8px;
}
.tool-tagline { font-size: 17px; color: var(--c-muted); }
.ai-badge {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  background: var(--c-ai-light);
  color: var(--c-ai);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .3px;
}

/* ── Tool widget ─────────────────────────────────────────────── */
.tool-widget {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 32px 0;
  min-height: 240px;
}
.tool-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--c-muted);
  font-size: 14px;
}
.tool-input {
  width: 100%;
  min-height: 160px;
  padding: 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
  transition: border-color .15s;
}
.tool-input:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.tool-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0;
  flex-wrap: wrap;
}
.btn {
  padding: 9px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  border: none;
  transition: background .15s, transform .1s;
}
.btn:active { transform: scale(.98); }
.btn--primary {
  background: var(--c-accent);
  color: #fff;
}
.btn--primary:hover { background: #1d4ed8; }
.btn--secondary {
  background: var(--c-border);
  color: var(--c-text);
}
.btn--secondary:hover { background: var(--c-border-strong); }
.btn--copy {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  padding: 7px 14px;
  font-size: 13px;
}
.btn--copy:hover { border-color: var(--c-accent); color: var(--c-accent); }

.tool-output {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 15px;
  line-height: 1.7;
  min-height: 80px;
  white-space: pre-wrap;
  word-break: break-word;
}
.stats-bar {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat__val {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -.5px;
  font-variant-numeric: tabular-nums;
}
.stat__label { font-size: 12px; color: var(--c-muted); }

.select {
  padding: 8px 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 14px;
}
.select:focus { outline: none; border-color: var(--c-accent); }

/* ── About and FAQ sections ─────────────────────────────────── */
.tool-about,
.tool-faq {
  margin: 40px 0;
  padding-top: 32px;
  border-top: 1px solid var(--c-border);
}
.tool-about h2,
.tool-faq h2 { font-size: 20px; font-weight: 600; margin-bottom: 16px; }
.tool-about p { font-size: 15px; color: var(--c-muted); line-height: 1.7; }

.faq-item {
  border-bottom: 1px solid var(--c-border);
  padding: 18px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-q { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.faq-a { font-size: 14px; color: var(--c-muted); line-height: 1.7; }

/* ── Related tools ──────────────────────────────────────────── */
.related-tools { margin: 40px 0; padding-top: 32px; border-top: 1px solid var(--c-border); }
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 16px;
}
.related-card {
  display: flex;
  flex-direction: column;
  padding: 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-text);
  text-decoration: none;
  transition: border-color .15s;
}
.related-card:hover { border-color: var(--c-accent); text-decoration: none; }
.related-name { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.related-tag { font-size: 12px; color: var(--c-muted); }

/* ── Ad slots ───────────────────────────────────────────────── */
.ad-slot {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 24px 0;
}
.ad-slot--leaderboard { min-height: 90px; }
.ad-slot--rect { min-height: 250px; }
.ad-slot--sidebar { min-height: 600px; }

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--c-border);
  padding: 24px 0;
  margin-top: auto;
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer p { font-size: 13px; color: var(--c-muted); }
.site-footer nav { display: flex; gap: 16px; }
.site-footer nav a { font-size: 13px; color: var(--c-muted); }
.site-footer nav a:hover { color: var(--c-text); }

/* ── Spinner ─────────────────────────────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--c-border);
  border-top-color: var(--c-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero { padding: 48px 0 36px; }
  .tool-widget { padding: 18px; }
  .stats-bar { gap: 14px; }
  .site-footer .container { flex-direction: column; text-align: center; }
}