/* DevToolbox — Modern Card Design */
:root {
  --bg: #0a0e1a;
  --surface: #111827;
  --surface-2: #1f2937;
  --border: #2d3748;
  --accent: #6366f1;
  --accent-2: #8b5cf6;
  --accent-3: #ec4899;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --hover: #1e293b;
  --green: #10b981;
  --red: #ef4444;
  --orange: #f59e0b;
  --link-hover: #c7d2fe;
  --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-2: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-3: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --gradient-4: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.4);
  --shadow-md: 0 4px 20px rgba(0,0,0,.3);
  --shadow-glow: 0 0 60px rgba(99,102,241,.15);
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  font-size: 14px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed; top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,.15) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}
body::after {
  content: '';
  position: fixed; bottom: -200px; left: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(236,72,153,.12) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; position: relative; z-index: 1; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

/* ===== HEADER ===== */
.header {
  background: rgba(17, 24, 39, .85);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 16px;
}
.logo {
  font-size: 20px; font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap; letter-spacing: -.5px;
}
.logo:hover { text-decoration: none; opacity: .9; }
.nav { display: flex; gap: 18px; align-items: center; }
.nav a {
  color: var(--muted); font-size: 13px; font-weight: 500;
  white-space: nowrap; transition: color .15s;
}
.nav a:hover, .nav a.active { color: var(--text); text-decoration: none; }
.nav a.active { color: var(--accent); }

.theme-toggle {
  background: var(--surface-2); border: 1px solid var(--border); color: var(--muted);
  padding: 5px 11px; border-radius: 6px; cursor: pointer; font-size: 14px;
  transition: all .15s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--text); transform: scale(1.05); }

/* ===== LANG SWITCHER (red frame style) ===== */
.lang-btn {
  background: var(--surface); border: 1.5px solid var(--red); color: var(--text);
  padding: 4px 9px; border-radius: 4px; cursor: pointer; font-size: 12px;
  display: inline-flex; align-items: center; gap: 5px; font-weight: 500;
  transition: all .15s;
}
.lang-btn:hover { background: rgba(239,68,68,.08); }
.lang-btn svg { width: 14px; height: 14px; flex-shrink: 0; color: var(--red); }
/* ===== COOKIE BAR ===== */
.cookie-bar {
  position: fixed; left: 16px; right: 16px; bottom: 16px;
  background: rgba(17, 24, 39, .98); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px 20px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  box-shadow: var(--shadow-lg); z-index: 9999;
  font-size: 13px; color: var(--text); backdrop-filter: blur(8px);
}
.cookie-bar .cookie-text { flex: 1; min-width: 240px; line-height: 1.5; }
.cookie-bar .cookie-text a { color: var(--accent); }
.cookie-bar .cookie-accept {
  background: var(--gradient-1); color: #fff; border: none;
  padding: 8px 20px; border-radius: 6px; cursor: pointer;
  font-size: 13px; font-weight: 600; white-space: nowrap;
  transition: transform .15s, box-shadow .15s;
}
.cookie-bar .cookie-accept:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99,102,241,.4); }
body.light-mode .cookie-bar { box-shadow: 0 8px 24px rgba(0,0,0,.08); }

/* ===== HERO ===== */
.hero {
  text-align: center; padding: 60px 0 40px; position: relative;
}
.hero h1 {
  font-size: 48px; font-weight: 800; margin-bottom: 12px;
  background: var(--gradient-1);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1.5px; line-height: 1.1;
}
.hero p {
  color: var(--muted); font-size: 16px; margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto;
}

/* ===== BADGE BAR ===== */
.badge-bar {
  display: flex; justify-content: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 32px;
}
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 12px; font-weight: 500; color: var(--text);
  transition: all .15s;
}
.badge:hover { transform: translateY(-1px); border-color: var(--accent); }
.badge .badge-icon { font-size: 14px; }

/* ===== SEARCH ===== */
.search-wrap { position: relative; max-width: 560px; margin: 0 auto; }
.search-box {
  width: 100%; padding: 14px 20px 14px 44px; border-radius: 28px;
  border: 2px solid var(--border); background: var(--surface);
  color: var(--text); font-size: 15px; outline: none;
  transition: all .2s;
}
.search-box:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(99,102,241,.1); }
.search-box::placeholder { color: var(--muted); }
.search-wrap::before {
  content: '🔍'; position: absolute; left: 18px; top: 50%;
  transform: translateY(-50%); font-size: 16px; pointer-events: none;
}

/* ===== CATEGORY CARDS (cat-card) ===== */
.tools-section { padding: 0 0 60px; }
.cat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 24px; margin-bottom: 20px;
  transition: all .2s; position: relative; overflow: hidden;
}
.cat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-1); opacity: .7;
}
.cat-card:nth-child(4n+2)::before { background: var(--gradient-2); }
.cat-card:nth-child(4n+3)::before { background: var(--gradient-3); }
.cat-card:nth-child(4n+4)::before { background: var(--gradient-4); }
.cat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.cat-card h2 {
  font-size: 18px; font-weight: 700; color: var(--text);
  margin-bottom: 14px; display: flex; align-items: center; gap: 10px;
}
.cat-card h2 .cat-icon { font-size: 22px; }
.tool-links {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.tool-links a {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text); font-size: 15px; font-weight: 500;
  padding: 9px 16px; border-radius: 8px; transition: all .15s;
  background: var(--surface-2); border: 1px solid var(--border);
  position: relative; white-space: nowrap;
}
.tool-links a::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); opacity: .5; transition: all .15s;
}
.tool-links a:hover {
  background: var(--accent); color: #fff; text-decoration: none;
  border-color: var(--accent); transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99,102,241,.3);
}
.tool-links a:hover::before { background: #fff; opacity: 1; }

/* ===== STATS BAR ===== */
.stats-bar {
  text-align: center; color: var(--muted); font-size: 13px;
  padding: 20px 0; margin-top: 20px;
  border-top: 1px solid var(--border);
}
.stats-bar strong {
  background: var(--gradient-1);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; font-weight: 700;
}

/* ===== AD SLOT ===== */
.ad-slot {
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: 8px; padding: 24px; text-align: center;
  margin: 24px 0; color: var(--muted); font-size: 12px;
}

/* ===== FOOTER ===== */
.footer {
  margin-top: auto; background: var(--surface);
  border-top: 1px solid var(--border); padding: 36px 0 24px;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 24px;
}
.footer-links h4 {
  color: var(--accent); font-size: 12px; text-transform: uppercase;
  letter-spacing: .8px; margin-bottom: 10px; font-weight: 700;
}
.footer-links a {
  display: block; color: var(--muted); font-size: 12px;
  padding: 3px 0; transition: color .12s;
}
.footer-links a:hover { color: var(--accent); text-decoration: none; }
.footer-bottom {
  text-align: center; color: var(--muted); font-size: 11px;
  padding-top: 20px; margin-top: 24px; border-top: 1px solid var(--border);
}
.footer-bottom a { color: var(--accent); }
.footer-support {
  grid-column: 1 / -1;
  text-align: center;
  padding: 20px 0 10px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}
.footer-support h4 { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: .8px; margin-bottom: 8px; font-weight: 700; }
.footer-support p { color: var(--muted); font-size: 12px; margin-bottom: 12px; }
.support-btn {
  display: inline-block;
  margin: 4px 6px;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: transform .12s, box-shadow .12s;
}
.support-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3); }
.support-btn.bmc { background: linear-gradient(135deg, #ffdd00 0%, #fb923c 100%); color: #ffffff; border: none; box-shadow: 0 2px 8px rgba(251,146,60,.3); font-weight: 600; } .support-btn.bmc:hover { background: linear-gradient(135deg, #ffdd00 0%, #f97316 100%); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(251,146,60,.5); color: #ffffff; }
.support-btn.affiliate { background: var(--gradient-1); color: #fff; }

/* ===== TOOL PAGE COMMON ===== */
.tool-page { padding: 24px 0 50px; }
.breadcrumb { font-size: 12px; color: var(--muted); padding: 14px 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb span { color: var(--accent); }
.tool-page h2 {
  font-size: 28px; margin-bottom: 6px; font-weight: 700;
  background: var(--gradient-2);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.desc { color: var(--muted); font-size: 14px; margin-bottom: 20px; }

/* ===== BUTTONS ===== */
.btn-row { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
button, .btn {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); padding: 8px 16px;
  border-radius: 6px; font-size: 13px; cursor: pointer;
  transition: all .15s; font-family: inherit; font-weight: 500;
}
button:hover, .btn:hover { border-color: var(--accent); transform: translateY(-1px); }
button.primary {
  background: var(--gradient-1); color: #fff; border-color: transparent;
  font-weight: 600;
}
button.primary:hover { opacity: .9; box-shadow: 0 4px 12px rgba(99,102,241,.3); }
button.ghost { background: transparent; border-color: transparent; }
select, input[type="text"], input[type="number"], input[type="date"], input[type="color"] {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 12px; font-size: 13px; font-family: inherit;
  transition: border-color .15s;
}
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.1); }
input[type="color"] { padding: 2px; width: 44px; height: 34px; cursor: pointer; }

/* ===== TOOL LAYOUT ===== */
.tool-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.tool-wrap.full { grid-template-columns: 1fr; }
textarea, .output-box {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; font-family: 'Cascadia Code', 'Fira Code', Consolas, monospace;
  font-size: 13px; resize: vertical; min-height: 300px; width: 100%;
  transition: border-color .15s;
}
textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.1); }
.output-box { overflow: auto; white-space: pre-wrap; word-break: break-all; }

/* ===== CHEAT SHEET STYLES ===== */
.cheat-grid { display: flex; flex-direction: column; gap: 4px; }
.cheat-row {
  display: grid; grid-template-columns: 1.5fr 2fr; gap: 10px;
  padding: 6px 10px; border-radius: 4px; border-bottom: 1px solid var(--border);
  font-size: 13px; transition: background .12s;
}
.cheat-row:hover { background: var(--hover); }
.cheat-row .code { font-family: monospace; color: var(--accent); }
.cheat-row .caption { color: var(--muted); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero { padding: 40px 0 28px; }
  .tool-wrap { grid-template-columns: 1fr; }
  .tool-links { gap: 6px; }
  .tool-links a { font-size: 13px; padding: 7px 12px; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .header .container { height: 50px; }
  .nav { gap: 12px; }
  .nav a { font-size: 12px; }
  textarea, .output-box { min-height: 220px; }
  .cat-card { padding: 18px 16px; }
  .badge-bar { gap: 8px; }
  .badge { font-size: 11px; padding: 5px 10px; }
}

/* ===== LIGHT MODE ===== */
body.light-mode {
  --bg: #fafbfc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --accent-3: #db2777;
  --text: #0f172a;
  --muted: #64748b;
  --hover: #f1f5f9;
  --link-hover: #4338ca;
  --shadow-lg: 0 10px 40px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.06);
}
body.light-mode .header { box-shadow: 0 1px 3px rgba(0,0,0,.04); }
body.light-mode::before { background: radial-gradient(circle, rgba(79,70,229,.08) 0%, transparent 70%); }
body.light-mode::after { background: radial-gradient(circle, rgba(219,39,119,.06) 0%, transparent 70%); }

@media (max-width: 480px) {
  .tool-links { grid-template-columns: 1fr 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .btn-row { gap: 4px; }
  button, .btn { padding: 6px 10px; font-size: 12px; }
  .hero h1 { font-size: 26px; }
  .cat-card h2 { font-size: 16px; }
}


/* SEO 内容区块（每个工具页底部 300+ 字介绍） */
.seo-intro {
  margin-top: 32px;
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.85;
  box-shadow: var(--shadow-md);
}
.seo-intro h2 {
  font-size: 22px;
  margin-bottom: 14px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.seo-intro h3 {
  font-size: 16px;
  margin: 20px 0 10px;
  color: var(--text);
  font-weight: 600;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--border);
}
.seo-intro p {
  margin: 8px 0;
  color: var(--text);
}
.seo-intro ol, .seo-intro ul {
  margin: 8px 0;
  padding-left: 22px;
}
.seo-intro li {
  margin: 4px 0;
}
.seo-intro b, .seo-intro strong {
  color: var(--accent-2);
  font-weight: 600;
}
@media (max-width: 480px) {
  .seo-intro { padding: 20px 16px; font-size: 13px; }
  .seo-intro h2 { font-size: 18px; }
  .seo-intro h3 { font-size: 15px; }
}
/* PWA Install Banner */
#pwa-banner{display:none;position:fixed;bottom:0;left:0;right:0;z-index:999;background:var(--surface);border-top:2px solid #7c5cff;padding:14px 16px;box-shadow:0 -4px 20px rgba(124,92,255,.2);align-items:center;gap:12px}
#pwa-banner.show{display:flex}
#pwa-banner .pwa-icon{font-size:32px;flex-shrink:0}
#pwa-banner .pwa-text{flex:1;min-width:0}
#pwa-banner .pwa-title{font-size:14px;font-weight:700;color:var(--text)}
#pwa-banner .pwa-desc{font-size:12px;color:var(--muted)}
#pwa-banner .pwa-install{flex-shrink:0;background:linear-gradient(135deg,#7c5cff,#06b6d4);color:#fff;border:none;padding:8px 16px;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer}
#pwa-banner .pwa-close{flex-shrink:0;background:none;border:none;color:var(--muted);font-size:18px;cursor:pointer;padding:4px}
@media(max-width:480px){#pwa-banner{padding:10px 12px;gap:8px}#pwa-banner .pwa-icon{font-size:28px}#pwa-banner .pwa-install{padding:6px 12px;font-size:13px}}