/* ═══════════════════════════════════════════
   工具站共享样式 — ou-b.com/tools/
   ═══════════════════════════════════════════ */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --header-bg: #0f172a;
  --success: #10b981;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -2px rgba(0,0,0,.04);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ────────────────────────────── */
.site-header {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,.15);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo a {
  color: #e2e8f0;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: rgba(255,255,255,.75);
  text-decoration: none;
  font-size: .9rem;
  transition: color .2s;
}

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

.lang-switch {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: .8rem !important;
  margin-left: 4px;
}

.lang-switch:hover {
  background: rgba(255,255,255,.15);
  color: #fff !important;
}

.sidebar-section.ad-placeholder {
  background: #f8fafc;
  border: 2px dashed #d1d5db;
  text-align: center;
  padding: 30px 20px;
  color: #9ca3af;
  font-size: .85rem;
}

.sidebar-section.ad-placeholder .ad-sub {
  font-size: .75rem;
}

.search-toggle {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  color: rgba(255,255,255,.5);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: .85rem;
  transition: all .2s;
}

.search-toggle:hover {
  background: rgba(255,255,255,.12);
  color: #fff;
}

/* ── Layout ─────────────────────────────── */
.page-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 20px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 30px;
  flex: 1;
}

.page-wrap.full {
  grid-template-columns: 1fr;
}

/* ── Sidebar ────────────────────────────── */
.sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}

.sidebar-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-section h3 {
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.sidebar-cats {
  list-style: none;
}

.sidebar-cats li {
  margin-bottom: 4px;
}

.sidebar-cats a {
  display: block;
  padding: 7px 10px;
  color: var(--text);
  text-decoration: none;
  font-size: .9rem;
  border-radius: 6px;
  transition: all .15s;
}

.sidebar-cats a:hover,
.sidebar-cats a.active {
  background: var(--primary-light);
  color: var(--primary);
}

.sidebar-cats .count {
  float: right;
  color: var(--text-muted);
  font-size: .8rem;
}

/* ── Main Content ───────────────────────── */
.main-content {
  min-width: 0;
}

/* ── Hero ───────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--header-bg) 0%, #1e293b 50%, #334155 100%);
  border-radius: var(--radius);
  padding: 50px 40px;
  margin-bottom: 30px;
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.hero h1 span { color: var(--accent); }

.hero p {
  color: rgba(255,255,255,.7);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Tool Cards (Grid) ──────────────────── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: all .2s;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.tool-card .icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.tool-card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.tool-card p {
  font-size: .87rem;
  color: var(--text-muted);
  flex: 1;
}

.tool-card .tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: .75rem;
  padding: 2px 10px;
  border-radius: 99px;
  align-self: flex-start;
  margin-top: 12px;
}

/* ── Category Sections ──────────────────── */
.cat-section {
  margin-bottom: 36px;
}

.cat-section h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cat-section .view-all {
  margin-left: auto;
  font-size: .85rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

/* ── Tool Page ──────────────────────────── */
.tool-page {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
}

.tool-page-header {
  margin-bottom: 24px;
}

.tool-page-header h1 {
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.tool-page-header p {
  color: var(--text-muted);
  font-size: .95rem;
}

.tool-body {
  padding: 20px 0;
  min-height: 300px;
}

.tool-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover { background: var(--primary-dark); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-success:hover { opacity: .9; }

/* ── Inputs ─────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: .9rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  background: #fff;
  color: var(--text);
  transition: border .2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.result-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 16px;
  display: none;
}

.result-box.visible {
  display: block;
}

.result-box .value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #16a34a;
}

.result-box .label {
  font-size: .85rem;
  color: #15803d;
  margin-bottom: 4px;
}

/* ── Breadcrumb ─────────────────────────── */
.breadcrumb {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb .sep {
  color: var(--border);
}

/* ── Category Badge ─────────────────────── */
.cat-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: .78rem;
  padding: 3px 12px;
  border-radius: 99px;
  margin-bottom: 10px;
}

/* ── Footer ─────────────────────────────── */
.site-footer {
  background: var(--header-bg);
  color: rgba(255,255,255,.6);
  padding: 40px 20px 24px;
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
}

.footer-col h4 {
  color: #e2e8f0;
  font-size: .9rem;
  margin-bottom: 14px;
}

.footer-col p,
.footer-col a {
  font-size: .85rem;
  color: rgba(255,255,255,.5);
  text-decoration: none;
  display: block;
  margin-bottom: 6px;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  max-width: 1200px;
  margin: 30px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: .82rem;
  display: flex;
  justify-content: space-between;
  color: rgba(255,255,255,.35);
}

/* ── Mobile ─────────────────────────────── */
@media (max-width: 768px) {
  .page-wrap {
    grid-template-columns: 1fr;
    padding: 20px 15px;
  }

  .sidebar {
    position: static;
    display: none;
  }

  .sidebar.mobile-show {
    display: block;
  }

  .header-inner {
    padding: 0 15px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a { font-size: .82rem; }

  .hero {
    padding: 30px 20px;
  }

  .hero h1 { font-size: 1.4rem; }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .tool-page {
    padding: 20px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  .cat-section h2 {
    font-size: 1.1rem;
  }
}

/* ── Utility ────────────────────────────── */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.gap-10 { gap: 10px; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }