:root { --bg: #0d1117; --card: #161b22; --border: #30363d; --text: #c9d1d9; --primary: #1f6feb; --success: #238636; --danger: #da3633; }
body { background-color: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, sans-serif; margin: 0; padding: 0; line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
header { background-color: var(--card); border-bottom: 1px solid var(--border); padding: 1rem 0; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; display: flex; justify-content: space-between; align-items: center; }
.nav-links { display: flex; gap: 1.5rem; align-items: center; flex-wrap: wrap; }
.nav-links a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); text-decoration: none; }
.lang-switcher { display: flex; gap: 0.5rem; }
.lang-switcher a { padding: 0.3rem 0.6rem; background: var(--bg); border: 1px solid var(--border); border-radius: 4px; font-size: 0.8rem; font-weight: bold; color: var(--text); }
.lang-switcher a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
main { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1.5rem; margin-bottom: 1.5rem; }
h1 { margin-top: 0; font-size: 1.75rem; color: #fff; margin-bottom: 1.5rem; }
h2 { font-size: 1.25rem; color: #fff; margin-top: 1.5rem; }
textarea#src, textarea#dst { width: 100%; height: 350px; background: #0d1117; color: #c9d1d9; border: 1px solid var(--border); border-radius: 6px; padding: 1rem; font-family: monospace; resize: none; box-sizing: border-box; }
.CodeMirror { height: 350px; border: 1px solid var(--border); border-radius: 6px; font-family: 'JetBrains Mono', 'Consolas', monospace; font-size: 14px; background-color: #0d1117 !important; }
.controls { display: flex; align-items: center; justify-content: space-between; background: var(--card); padding: 1rem 1.5rem; border-radius: 8px; border: 1px solid var(--border); margin: 1.5rem 0; flex-wrap: wrap; gap: 1rem; }
.btn-group { display: flex; gap: 0.8rem; align-items: center; }
button, .btn { padding: 0.6rem 1.2rem; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 0.9rem; display: inline-flex; align-items: center; color: #fff; transition: all 0.2s; }
.btn-primary { background-color: var(--primary); }
.btn-primary:hover { background-color: #388bfd; }
.btn-success { background-color: var(--success); }
.btn-success:hover { background-color: #2ea043; }
.btn-danger { background-color: transparent; border: 1px solid var(--border); color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); background: rgba(218,54,51,0.1); }
select { background: var(--bg); color: var(--text); border: 1px solid var(--border); padding: 0.5rem; border-radius: 4px; outline: none; font-weight: bold; }
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.tool-card { background: var(--card); border: 1px solid var(--border); padding: 1.5rem; border-radius: 8px; transition: transform 0.2s; display: block; }
.tool-card:hover { transform: translateY(-4px); border-color: var(--primary); }
.tool-card h3 { margin: 0 0 0.5rem 0; color: #fff; }
.tool-card p { margin: 0; color: #8b949e; font-size: 0.9rem; }
.seo-block { margin-top: 3rem; border-top: 1px solid var(--border); padding-top: 2rem; }
.seo-block ul { margin: 1rem 0; padding-left: 1.5rem; color: #8b949e; }
.seo-block li { margin-bottom: 0.5rem; }
footer { text-align: center; padding: 2rem 0; color: #8b949e; font-size: 0.9rem; border-top: 1px solid var(--border); margin-top: 3rem; }