:root {
  --bg: #0C1018;
  --panel: #171D28;
  --panel2: #202838;
  --input: #111722;
  --orange: #FF832B;
  --orange-hover: #E96F17;
  --text: #F4F6FA;
  --muted: #9BA7B8;
  --border: #303A4A;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 20px; width: 100%; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(12, 16, 24, .92);
  position: sticky; top: 0; z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand {
  color: var(--text); text-decoration: none; font-size: 1.25rem; font-weight: 700;
  display: flex; align-items: center; gap: 8px;
}
.brand-mark { color: var(--orange); }
.nav { display: flex; gap: 22px; }
.nav a { color: var(--muted); text-decoration: none; font-size: .92rem; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--text); }
.nav a.active { color: var(--orange); border-bottom-color: var(--orange); }

main { flex: 1; padding: 44px 20px 60px; }

.hero { text-align: center; padding: 30px 0 46px; }
.hero h1 { font-size: 2.5rem; line-height: 1.2; max-width: 720px; margin: 0 auto 14px; }
.hero-sub { color: var(--muted); max-width: 620px; margin: 0 auto 26px; font-size: 1.08rem; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block; background: var(--panel2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
  padding: 10px 20px; font-size: .95rem; font-family: inherit; text-decoration: none;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: #303C50; border-color: #46536A; }
.btn-primary { background: var(--orange); border-color: var(--orange); color: #10151E; font-weight: 700; }
.btn-primary:hover { background: var(--orange-hover); border-color: var(--orange-hover); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-bottom: 50px; }
.tool-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px; text-decoration: none; color: var(--text); display: block;
  transition: border-color .15s, transform .15s;
}
.tool-card:hover { border-color: var(--orange); transform: translateY(-2px); }
.tool-num { color: var(--orange); font-weight: 700; font-size: .85rem; letter-spacing: 2px; margin-bottom: 10px; }
.tool-card h2, .tool-card h3 { font-size: 1.25rem; margin-bottom: 8px; }
.tool-card p { color: var(--muted); font-size: .93rem; margin-bottom: 14px; }
.tool-link { color: var(--orange); font-size: .9rem; font-weight: 600; }

.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; margin-bottom: 22px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; gap: 10px; flex-wrap: wrap; }
.panel-head h2 { font-size: 1.05rem; color: var(--orange); }
.io {
  width: 100%; min-height: 220px; background: var(--input); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 14px;
  font-family: Consolas, 'Courier New', monospace; font-size: .85rem; line-height: 1.5;
  resize: vertical;
}
.io:focus { outline: none; border-color: var(--orange); }
.file-btn {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 6px;
  padding: 7px 16px; cursor: pointer; font-size: .88rem; color: var(--text);
}
.file-btn:hover { background: #303C50; }

.options { display: flex; flex-wrap: wrap; gap: 12px 22px; margin: 14px 0 4px; }
.options label { display: flex; align-items: center; gap: 8px; font-size: .9rem; color: var(--muted); cursor: pointer; }
.options input[type="checkbox"] { accent-color: var(--orange); width: 16px; height: 16px; cursor: pointer; }
.actions { display: flex; align-items: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.status { color: var(--muted); font-size: .88rem; }
.status.error { color: #FF6B6B; }
.tag { font-size: .75rem; background: var(--panel2); border: 1px solid var(--border); border-radius: 20px; padding: 2px 10px; margin-left: 8px; color: var(--muted); vertical-align: middle; }
.tag.on { color: var(--orange); border-color: var(--orange); }

.shift-row, .convert-row { align-items: center; }
.shift-label { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .95rem; }
.shift-input {
  background: var(--input); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 8px 12px; font-family: inherit; font-size: .95rem; width: 110px;
}
.shift-input:focus { outline: none; border-color: var(--orange); }
.shift-input.select { width: 170px; }
.hint { color: #687589; font-size: .82rem; }

.tool-page h1 { font-size: 2rem; margin-bottom: 8px; }
.page-sub { color: var(--muted); max-width: 720px; margin-bottom: 26px; }

.seo-text { max-width: 760px; margin-top: 44px; }
.seo-text h2 { font-size: 1.3rem; margin: 26px 0 10px; color: var(--text); }
.seo-text h2:first-child { margin-top: 0; }
.seo-text p, .seo-text li { color: var(--muted); margin-bottom: 10px; }
.seo-text ul { padding-left: 22px; }
.seo-text code { background: var(--input); border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; font-size: .85em; color: var(--orange); }
.seo-text a { color: var(--orange); }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: #687589; font-size: .85rem; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--orange); }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.7rem; }
  .nav { gap: 12px; }
  .nav a { font-size: .8rem; }
}