.dia-nav{position:sticky;top:0;z-index:1000;background:var(--bg-card);border-bottom:var(--border);box-shadow:var(--shadow)}.dia-nav__inner{max-width:1200px;margin:0 auto;padding:0 1rem;display:flex;align-items:center;height:56px;gap:.25rem}.dia-nav__logo{font-size:1.125rem;font-weight:700;color:var(--text);text-decoration:none;margin-right:auto;display:flex;align-items:center;gap:.5rem}.dia-nav__logo:hover{text-decoration:none}.dia-nav__links{display:flex;align-items:center;gap:.125rem}.dia-nav__link{color:var(--text-secondary);padding:.375rem .75rem;border-radius:6px;font-size:.875rem;font-weight:500;transition:background .15s,color .15s;text-decoration:none;white-space:nowrap}.dia-nav__link:hover{background:var(--bg-hover);color:var(--text);text-decoration:none}.dia-nav__link--active{background:var(--bg-hover);color:var(--text);font-weight:600}.dia-nav__actions{display:flex;align-items:center;gap:.5rem;margin-left:.75rem}.dia-nav__lang-btn,.dia-nav__theme-btn,.dia-nav__mob-toggle{background:none;border:none;color:var(--text-secondary);padding:.5rem;border-radius:6px;font-size:1.125rem;cursor:pointer;transition:background .15s}.dia-nav__lang-btn{font-size:11px;font-weight:700;padding:4px 8px;border:1px solid var(--border-color, #e2e8f0);border-radius:4px}.dia-nav__exam-wrap{position:relative}.dia-nav__exam-btn{display:flex;align-items:center;gap:4px;font-size:11px;font-weight:700;padding:4px 8px;border:1px solid var(--accent, #1a2f5e);border-radius:4px;background:none;color:var(--accent, #1a2f5e);cursor:pointer;font-family:var(--font);transition:background .15s}.dia-nav__exam-btn:hover{background:var(--bg-hover)}.dia-nav__exam-menu{display:none;position:absolute;top:calc(100% + 6px);right:0;min-width:130px;background:var(--bg-card, #fff);border:1px solid var(--border-color, #e2e8f0);border-radius:8px;box-shadow:0 4px 16px #0000001f;padding:4px;z-index:1000}.dia-nav__exam-menu--open{display:block}.dia-nav__exam-option{padding:8px 12px;font-size:12px;font-weight:600;color:var(--text-secondary);border-radius:6px;cursor:pointer;transition:background .1s}.dia-nav__exam-option:hover{background:var(--bg-hover);color:var(--text)}.dia-nav__exam-option--active{color:var(--accent);background:var(--accent-light, #eff6ff)}.dia-nav__lang-btn:hover,.dia-nav__theme-btn:hover,.dia-nav__mob-toggle:hover{background:var(--bg-hover);color:var(--text)}.dia-nav__signin-btn{background:var(--accent);color:#fff;font-size:.813rem;font-weight:600;padding:.375rem .875rem;border-radius:6px;border:none;cursor:pointer;font-family:var(--font);transition:opacity .15s}.dia-nav__signin-btn:hover{opacity:.9}.dia-nav__mob-toggle{display:none}.dia-nav__user{position:relative}.dia-nav__user-btn{background:var(--bg-hover);border:1px solid var(--border-color);color:var(--text);padding:.375rem .75rem;border-radius:6px;font-size:.813rem;cursor:pointer;display:flex;align-items:center;gap:.375rem}.dia-nav__dropdown{position:absolute;top:calc(100% + .5rem);right:0;background:var(--bg-card);border:var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);min-width:200px;padding:.5rem;display:none;z-index:1001}.dia-nav__dropdown.is-open{display:block}.dia-nav__dropdown-item{display:block;width:100%;padding:.5rem .75rem;border:none;background:none;color:var(--text);font-size:.875rem;text-align:left;border-radius:4px;cursor:pointer;text-decoration:none}.dia-nav__dropdown-item:hover{background:var(--bg-hover);text-decoration:none}.dia-nav__dropdown-item--danger{color:var(--red)}@media(max-width:768px){.dia-nav__links{position:fixed;top:56px;left:0;right:0;background:var(--bg-card);flex-direction:column;padding:.75rem;gap:.25rem;border-bottom:var(--border);box-shadow:var(--shadow-lg);display:none}.dia-nav__links.is-open{display:flex}.dia-nav__link{width:100%;padding:.625rem .75rem}.dia-nav__mob-toggle{display:block}}.dia-footer{background:var(--bg-card);border-top:var(--border);padding:48px 24px 0;margin-top:auto}.dia-footer__grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:32px}.dia-footer__brand{font-size:18px;font-weight:800;color:var(--text);margin-bottom:8px}.dia-footer__desc{font-size:13px;color:var(--text-muted);line-height:1.6;margin:0}.dia-footer__socials{display:flex;gap:12px;margin-top:14px}.dia-footer__social{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:6px;transition:opacity .15s}.dia-footer__social:hover{opacity:.75}.dia-footer__social--telegram{color:#2aabee}.dia-footer__social--instagram{color:#e1306c}.dia-footer__heading{font-size:10px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:14px}.dia-footer__link{display:block;font-size:13px;color:var(--text-secondary);text-decoration:none;margin-bottom:10px;transition:color .15s}.dia-footer__link:hover{color:var(--text);text-decoration:none}.dia-footer__bottom{border-top:var(--border);padding:20px 0;text-align:center}.dia-footer__copy{font-size:12px;color:var(--text-muted)}@media(max-width:768px){.dia-footer__grid{grid-template-columns:1fr 1fr;gap:24px}}@media(max-width:480px){.dia-footer__grid{grid-template-columns:1fr;gap:20px}}