:root{--bg:#f4f6fb;--surface:#ffffff;--border:#e4e8f0;--text:#1a2230;--muted:#6b7686;--primary:#2f6fed;--primary-dark:#1f57c8;--success:#1faa6b;--warn:#e0a106;--danger:#e23b48;--radius:12px;--shadow:0 1px 2px rgba(16,24,40,0.04),0 4px 16px rgba(16,24,40,0.06)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.55}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1080px;margin:0 auto;padding:0 20px}.header{background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:20}.header .container{max-width:1280px}.header-inner{display:flex;align-items:center;gap:16px;height:58px}.logo{font-weight:800;font-size:18px;color:var(--text);white-space:nowrap}.logo span{color:var(--primary)}.nav{display:flex;gap:14px;align-items:center}.nav a{color:var(--muted);font-weight:500;font-size:14px;white-space:nowrap}.nav a:hover{color:var(--text);text-decoration:none}.header-spacer{flex:1 1}.header-user{display:flex;gap:10px;align-items:center}.header-user a{font-size:14px;white-space:nowrap}.header-user .btn{padding:7px 12px;font-size:13px}.lang-dd{position:relative;display:inline-block}.lang-toggle{display:inline-flex;align-items:center;gap:5px;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:5px 9px;font-size:13px;font-weight:700;color:var(--text);cursor:pointer}.lang-toggle:hover{border-color:var(--primary);color:var(--primary)}.lang-caret{font-size:10px;transition:transform .15s ease}.lang-caret.open{transform:rotate(180deg)}.lang-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:160px;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:0 10px 28px 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