/* ===== 在线工具集 - 全局样式 ===== */
:root {
  --bg: #f7f8fa;
  --bg-card: #ffffff;
  --bg-soft: #f1f3f7;
  --text: #1a1f36;
  --text-soft: #5b6478;
  --text-muted: #8a93a6;
  --border: #e6e9f0;
  --primary: #3b6ef6;
  --primary-dark: #2a56d4;
  --primary-soft: #eaf0ff;
  --accent: #ff6b4a;
  --green: #16a34a;
  --red: #dc2626;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 3px rgba(20,30,60,.06), 0 6px 24px rgba(20,30,60,.05);
  --shadow-hover: 0 4px 12px rgba(20,30,60,.1), 0 12px 36px rgba(20,30,60,.09);
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 19px;
  color: var(--text);
  letter-spacing: -.3px;
}
.brand .logo {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--primary), #6a8cff);
  border-radius: 8px;
  display: grid; place-items: center;
  color: #fff; font-size: 16px; font-weight: 800;
}
.nav-links {
  display: flex;
  gap: 6px;
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 13px;
  border-radius: 8px;
}
.nav-links a:hover { background: var(--bg-soft); color: var(--text); }
.nav-search {
  width: 200px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  background: var(--bg-soft);
  color: var(--text);
  outline: none;
  transition: border .15s;
}
.nav-search:focus { border-color: var(--primary); background: #fff; }

/* ===== 通用容器 ===== */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 64px 20px 40px;
}
.hero h1 {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 16px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 17px;
  color: var(--text-soft);
  max-width: 580px;
  margin: 0 auto 28px;
}
.hero-search {
  max-width: 520px;
  margin: 0 auto;
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-search input {
  flex: 1;
  border: none;
  padding: 14px 18px;
  font-size: 15px;
  outline: none;
  background: transparent;
  color: var(--text);
}
.hero-search button {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.hero-search button:hover { background: var(--primary-dark); }

/* ===== 工具分类与网格 ===== */
.section { padding: 20px 0 48px; }
.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}
.section-title .ic { font-size: 22px; }
.section-desc { color: var(--text-muted); font-size: 14px; margin-bottom: 22px; }

.cat-block { margin-bottom: 38px; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all .18s ease;
  position: relative;
  overflow: hidden;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-soft);
}
.tool-card .tc-icon {
  width: 44px; height: 44px;
  border-radius: 11px;
  display: grid; place-items: center;
  font-size: 22px;
  margin-bottom: 13px;
  background: var(--primary-soft);
}
.tool-card h3 { font-size: 15.5px; font-weight: 650; margin-bottom: 5px; }
.tool-card p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
.tool-card .tc-tag {
  position: absolute; top: 14px; right: 14px;
  font-size: 10px; font-weight: 600;
  padding: 2px 7px; border-radius: 5px;
  background: var(--bg-soft); color: var(--text-muted);
}
.tool-card .tc-tag.hot { background: #fff0ed; color: var(--accent); }

/* ===== 广告位 ===== */
.ad-slot {
  margin: 28px auto;
  max-width: var(--maxw);
  min-height: 90px;
  background: var(--bg-soft);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}
.ad-slot.inline { margin: 20px 0; min-height: 100px; }
.ad-label { font-size: 10px; text-transform: uppercase; letter-spacing: 1px; opacity: .6; }

/* ===== 工具页面布局 ===== */
.tool-page { padding: 28px 0 60px; }
.tool-head {
  margin-bottom: 24px;
}
.tool-head .crumbs { font-size: 13px; color: var(--text-muted); margin-bottom: 10px; }
.tool-head .crumbs a { color: var(--text-muted); }
.tool-head h1 {
  font-size: 28px; font-weight: 800; letter-spacing: -.5px;
  display: flex; align-items: center; gap: 12px;
}
.tool-head h1 .th-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--primary-soft); display: grid; place-items: center; font-size: 21px;
}
.tool-head .sub { color: var(--text-soft); margin-top: 8px; font-size: 15px; }

.tool-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

/* ===== 表单控件 ===== */
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--text-soft); margin-bottom: 7px; }
.input, .textarea, .select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border .15s, box-shadow .15s;
}
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.textarea { resize: vertical; min-height: 120px; font-family: var(--mono); font-size: 13px; }
.input.mono { font-family: var(--mono); font-size: 13px; }

.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 11px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  font-family: var(--font);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-soft { background: var(--bg-soft); color: var(--text); }
.btn-soft:hover { background: var(--border); }
.btn-ghost { background: transparent; color: var(--text-soft); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }

.output-box {
  margin-top: 20px;
  padding: 18px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 13px;
  word-break: break-all;
  white-space: pre-wrap;
  min-height: 50px;
}
.output-box.empty { color: var(--text-muted); font-family: var(--font); }
.result-stats { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 16px; }
.stat { background: var(--bg-soft); padding: 12px 18px; border-radius: var(--radius-sm); }
.stat .n { font-size: 22px; font-weight: 800; color: var(--primary); }
.stat .l { font-size: 12px; color: var(--text-muted); }

/* range slider */
.range-row { display: flex; align-items: center; gap: 14px; }
.range-row input[type=range] { flex: 1; accent-color: var(--primary); }
.range-row .rv { font-weight: 700; min-width: 48px; text-align: right; font-variant-numeric: tabular-nums; }

/* checkboxes */
.check-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.check-pill {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 14px; border: 1px solid var(--border); border-radius: 20px;
  font-size: 13px; cursor: pointer; user-select: none;
  transition: all .15s;
}
.check-pill input { display: none; }
.check-pill:hover { background: var(--bg-soft); }
.check-pill.active { background: var(--primary-soft); border-color: var(--primary); color: var(--primary-dark); font-weight: 600; }

/* file drop */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
  background: var(--bg-soft);
}
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }
.dropzone .dz-icon { font-size: 36px; margin-bottom: 8px; }
.dropzone p { color: var(--text-soft); font-size: 14px; }
.dropzone .hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* color swatches */
.swatch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px,1fr)); gap: 12px; margin-top: 16px; }
.swatch { border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); }
.swatch .top { height: 64px; }
.swatch .info { padding: 8px 10px; font-size: 12px; font-family: var(--mono); }

/* ===== 文案/SEO 区块 ===== */
.content-block {
  margin-top: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  line-height: 1.8;
}
.content-block h2 { font-size: 21px; font-weight: 700; margin: 26px 0 12px; }
.content-block h2:first-child { margin-top: 0; }
.content-block h3 { font-size: 17px; font-weight: 650; margin: 18px 0 8px; }
.content-block p { color: var(--text-soft); margin-bottom: 12px; }
.content-block ul, .content-block ol { margin: 0 0 14px 22px; color: var(--text-soft); }
.content-block li { margin-bottom: 6px; }
.content-block code { background: var(--bg-soft); padding: 2px 6px; border-radius: 4px; font-size: 13px; font-family: var(--mono); }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 40px 0 30px;
  margin-top: 30px;
}
.footer-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
}
.footer-grid h4 { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.footer-grid a { display: block; color: var(--text-muted); font-size: 13px; padding: 3px 0; }
.footer-grid a:hover { color: var(--primary); }
.footer-grid .fbrand { font-size: 13px; color: var(--text-muted); line-height: 1.7; }
.footer-bottom {
  max-width: var(--maxw); margin: 24px auto 0; padding: 18px 20px 0;
  border-top: 1px solid var(--border);
  text-align: center; font-size: 12px; color: var(--text-muted);
}

/* ===== 移动端 ===== */
@media (max-width: 760px) {
  .hero h1 { font-size: 28px; }
  .hero { padding: 40px 16px 28px; }
  .nav-search { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .tool-head h1 { font-size: 23px; }
  .tool-panel { padding: 18px; }
  .content-block { padding: 22px; }
}

/* ===== 小工具类 ===== */
.muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; }
.hidden { display: none !important; }
.flex { display: flex; } .gap-2 { gap: 10px; } .items-center { align-items: center; }
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: #fff; padding: 11px 22px; border-radius: 10px;
  font-size: 14px; box-shadow: var(--shadow-hover); opacity: 0; transition: opacity .2s, transform .2s;
  z-index: 9999; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }