:root,[data-theme=light]{--bg: #f8f9fa;--surface: #ffffff;--border: #e5e7eb;--text: #1f2937;--text-muted: #6b7280;--accent: #22c55e;--accent-hover: #16a34a;--header-bg: rgba(248, 249, 250, .9)}[data-theme=dark]{--bg: #0f0f12;--surface: #18181c;--border: #2a2a30;--text: #e4e4e7;--text-muted: #71717a;--accent: #22c55e;--accent-hover: #16a34a;--header-bg: rgba(15, 15, 18, .9)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Roboto Mono,monospace;line-height:1.6;transition:background-color .6s ease}header.site-header{border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--header-bg);backdrop-filter:blur(12px);z-index:10;transition:background-color .6s ease}nav{max-width:900px;margin:0 auto;padding:1rem 1.5rem;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem}.theme-toggle{position:relative;appearance:none;background:var(--surface);border:1px solid var(--border);border-radius:8px;width:2.25rem;height:2.25rem;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-muted);font-size:1.1rem;transition:color .2s,border-color .2s,background .2s}.nav-right{display:flex;align-items:center;gap:.75rem}.lang-dropdown{position:relative}.lang-dropdown-btn{appearance:none;display:flex;align-items:center;justify-content:center;gap:.25rem;min-width:5.5rem;padding:.4rem .75rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;color:var(--text-muted);font-family:inherit;font-size:.85rem;cursor:pointer;transition:color .2s,border-color .2s}.lang-dropdown-btn:hover{color:var(--accent);border-color:var(--accent)}.lang-dropdown-arrow{font-size:.7em;opacity:.8}.lang-dropdown-menu{position:absolute;top:100%;right:0;margin-top:.25rem;min-width:5.5rem;width:max-content;background:var(--surface);border:1px solid var(--border);border-radius:8px;box-shadow:0 4px 12px #0000001a;z-index:20;overflow:hidden}[data-theme=dark] .lang-dropdown-menu{box-shadow:0 4px 12px #0000004d}.lang-dropdown-item{display:block;padding:.5rem 1rem;min-width:5rem;color:var(--text);text-decoration:none;font-size:.85rem;transition:background .2s,color .2s}.lang-dropdown-item:hover{background:#22c55e1a;color:var(--accent)}.lang-bar{max-width:900px;margin:0 auto;padding:1rem 1.5rem 0;display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.lang-bar-btn{display:inline-flex;align-items:center;justify-content:center;min-width:2.5rem;padding:.4rem .75rem;background:#6b728026;border:1px solid rgba(107,114,128,.25);border-radius:8px;color:var(--text-muted);font-family:inherit;font-size:.85rem;text-decoration:none;transition:color .2s,border-color .2s,background .2s}.lang-bar-btn:hover{background:#22c55e1f;border-color:var(--accent);color:var(--accent)}.lang-bar-btn.lang-bar-current{background:#6b728040;border-color:#6b728059;color:var(--text-muted);cursor:default}[data-theme=dark] .lang-bar-btn{background:#71717a33;border-color:#71717a33}[data-theme=dark] .lang-bar-btn:hover{background:#22c55e26}[data-theme=dark] .lang-bar-btn.lang-bar-current{background:#71717a4d;border-color:#71717a4d}.theme-toggle:hover{color:var(--accent);border-color:var(--accent)}.theme-icon{position:absolute}.theme-icon-moon,[data-theme=dark] .theme-icon-sun{display:none}[data-theme=dark] .theme-icon-moon{display:inline}nav a{color:var(--text);text-decoration:none;font-size:.9rem;font-weight:500;transition:color .2s}nav a:hover{color:var(--accent)}.brand-suffix{color:var(--accent);font-weight:600}main{max-width:900px;margin:0 auto;padding:2rem 1.5rem}.site-footer{border-top:1px solid var(--border);margin-top:1.5rem;padding:1.5rem 1.5rem 2rem}.footer-inner{max-width:900px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1rem;font-size:.85rem;color:var(--text-muted)}.footer-inner a{color:var(--text-muted);text-decoration:none;transition:color .2s}.footer-inner a:hover{color:var(--accent)}.footer-sep{opacity:.5}.footer-copy{opacity:.8}.file-converter-links{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.75rem}.file-converter-card{display:inline-flex;align-items:center;gap:.5rem;padding:.875rem 1.5rem;background:var(--surface);border:1px solid var(--border);border-radius:12px;color:var(--text);text-decoration:none;font-weight:500;font-size:1rem;transition:border-color .2s,background .2s,color .2s;box-shadow:0 1px 2px #0000000a}.file-converter-card:hover{border-color:var(--accent);background:#22c55e0f;color:var(--accent)}.file-converter-card:after{content:"→";opacity:.6;font-size:1.1em}.file-converter-card:hover:after{opacity:1}