/* ToolHub — global styles */
:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #f0f2f7;
  --text: #1a1f2c;
  --text-muted: #5a6273;
  --border: #e4e7ee;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08);
  --max-width: 1120px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / nav */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 16px;
}
.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand .logo {
  display: inline-block;
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  color: #fff;
  text-align: center;
  line-height: 28px;
  font-size: 16px;
  font-weight: 700;
}
.brand:hover { text-decoration: none; }
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.nav a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
}
.nav a:hover { color: var(--primary); text-decoration: none; }
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface-2);
}
.lang-toggle button {
  border: 0;
  background: transparent;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}
.lang-toggle button.active {
  background: var(--primary);
  color: #fff;
}

.hero {
  background: linear-gradient(135deg, #eef2ff 0%, #f0fdf4 100%);
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: 40px;
  margin: 0 0 12px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0;
}

/* Section */
.section { padding: 56px 0; }
.section h2 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.section .lead {
  color: var(--text-muted);
  margin: 0 0 32px;
  max-width: 720px;
}

/* Tool cards */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
}
.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  text-decoration: none;
}
.tool-card .icon {
  font-size: 28px;
}
.tool-card h3 {
  font-size: 17px;
  margin: 0;
}
.tool-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}
.tool-card .arrow {
  margin-top: auto;
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
}

/* Blog cards */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .15s ease, box-shadow .15s ease;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
}
.blog-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.blog-card .cover {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  color: #fff;
  font-weight: 700;
}
.blog-card .body { padding: 18px 20px 20px; }
.blog-card .meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.blog-card h3 { font-size: 17px; margin: 0 0 8px; line-height: 1.35; }
.blog-card p { font-size: 14px; color: var(--text-muted); margin: 0; }

/* Page content (about / privacy / blog post) */
.page-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: var(--shadow);
}
.page-content h1 {
  font-size: 32px;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.page-content h2 {
  font-size: 22px;
  margin: 32px 0 10px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.page-content h2:first-of-type { border-top: 0; padding-top: 0; }
.page-content p { color: var(--text); }
.page-content ul, .page-content ol { color: var(--text); padding-left: 22px; }
.page-content li { margin-bottom: 4px; }
.page-content .meta { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }

/* Tool page */
.tool-page {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 36px;
  box-shadow: var(--shadow);
}
.tool-page h1 { font-size: 28px; margin: 0 0 8px; }
.tool-page .desc { color: var(--text-muted); margin: 0 0 24px; }
.tool-form { display: grid; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 14px; font-weight: 600; }
.field input, .field select, .field textarea {
  font-family: inherit;
  font-size: 15px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  width: 100%;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 0;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}
.field textarea { resize: vertical; min-height: 120px; font-family: var(--font-mono); }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  border: 0;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s ease;
}
.btn:hover { background: var(--primary-hover); }
.btn.secondary { background: var(--surface-2); color: var(--text); }
.btn.secondary:hover { background: #e2e6ef; }
.btn.danger { background: var(--danger); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

.result {
  margin-top: 22px;
  padding: 18px 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  white-space: pre-wrap;
  word-break: break-word;
}
.result h4 { margin: 0 0 8px; font-size: 14px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.result .big { font-size: 30px; font-weight: 700; color: var(--primary); }
.result .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 10px; }
.result .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.result .value { font-size: 17px; font-weight: 600; }

.notice {
  margin-top: 18px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}
.notice.info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
.notice.warn { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.notice.error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* Color picker swatch */
.swatch {
  width: 100%;
  height: 80px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-top: 8px;
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 48px 0 28px;
  margin-top: 64px;
}
.site-footer .grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 32px;
}
.site-footer h5 {
  color: #f8fafc;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 14px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #cbd5e1; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.site-footer .legal {
  border-top: 1px solid #1e293b;
  padding-top: 22px;
  font-size: 13px;
  color: #94a3b8;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* Ad slot placeholder (visible only when used; AdSense code will replace after approval) */
.ad-slot {
  margin: 28px 0;
  min-height: 90px;
  background: repeating-linear-gradient(45deg, #f8fafc, #f8fafc 10px, #f1f5f9 10px, #f1f5f9 20px);
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 13px;
}

[lang-block] { display: none; }
html[lang="en"] [data-lang="en"] { display: initial; }
html[lang="en"] [data-lang="zh"] { display: none; }
html[lang="zh"] [data-lang="en"] { display: none; }
html[lang="zh"] [data-lang="zh"] { display: initial; }
html[lang="zh"] [data-lang-block="en"] { display: none; }
html[lang="en"] [data-lang-block="zh"] { display: none; }

/* Make all block-level translations respect the same toggle */
[data-lang] { display: none; }
[data-lang-block] { display: none; }
html[lang="en"] [data-lang="en"] { display: block; }
html[lang="zh"] [data-lang="zh"] { display: block; }
html[lang="zh"] [data-lang-block="en"] { display: block; }
html[lang="en"] [data-lang-block="zh"] { display: block; }

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 44px 0 36px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 16px; }
  .section { padding: 40px 0; }
  .page-content, .tool-page { padding: 24px 20px; }
  .row { grid-template-columns: 1fr; }
  .result .grid2 { grid-template-columns: 1fr; }
  .site-header .container { flex-direction: column; align-items: flex-start; }
  .site-footer .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .site-footer .grid { grid-template-columns: 1fr; }
  .nav { gap: 12px; }
}