.site-header{background:var(--c-paper);color:var(--c-ink);border-bottom:1px solid var(--c-line);padding:14px 0;position:relative}.site-header:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--c-surrogate) 0 25%,var(--c-mini) 25% 50%,var(--c-teacher) 50% 75%,var(--c-good) 75% 100%);opacity:.18}.site-header-inner{max-width:1480px;margin:0 auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}.site-header .tracer-wordmark,.site-header .tracer-wordmark-text,.site-header .tracer-wordmark:hover{color:var(--c-ink)}.site-header nav{display:flex;align-items:center;gap:2px;font-size:13px}.site-header nav a{color:var(--c-ink-soft);text-decoration:none;padding:6px 12px;border-radius:var(--r-sm);font-weight:500;transition:background .1s,color .1s;position:relative}.site-header nav a:hover{color:var(--c-ink);background:var(--c-line-soft)}.site-header nav a.active{color:var(--c-ink);background:transparent;font-weight:600}.site-header nav a.active:after{content:"";position:absolute;left:12px;right:12px;bottom:-3px;height:2px;background:var(--c-ink);border-radius:2px}.site-header nav a.admin-link{color:var(--c-accent);text-transform:uppercase;letter-spacing:.08em;margin-left:6px}.site-header nav .email-pill,.site-header nav a.admin-link{font-family:var(--font-mono);font-size:11px;border:1px solid var(--c-line)}.site-header nav .email-pill{color:var(--c-ink-soft);padding:4px 10px;border-radius:var(--r-sm);background:var(--c-bg)}.site-header button.signout,.site-header form button.signout{background:transparent;color:var(--c-ink-soft);border:none;padding:6px 12px;font:inherit;font-size:13px;cursor:pointer;border-radius:var(--r-sm);transition:color .1s,background .1s}.site-header button.signout:hover,.site-header form button.signout:hover{color:var(--c-ink);background:var(--c-line-soft)}.site-header nav .nav-right{margin-left:auto;display:inline-flex;align-items:center;gap:10px}.site-header nav a.nav-credits{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border:1px solid var(--c-line);border-radius:var(--r-sm);background:var(--c-bg);text-decoration:none}.site-header nav a.nav-credits:hover{border-color:var(--c-ink);background:var(--c-bg)}.site-header nav a.nav-credits .nav-credits-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--c-ink-soft)}.site-header nav a.nav-credits .nav-credits-value{font-size:13px;font-weight:700;color:var(--c-ink);letter-spacing:-.01em}.site-header nav a.nav-credits.is-low{border-color:#fecaca;background:#fef2f2}.site-header nav a.nav-credits.is-low .nav-credits-value{color:#b91c1c}.nav-account{position:relative;display:inline-block}.nav-account-btn{display:inline-flex;align-items:center;justify-content:center;padding:0;border:1px solid var(--c-line);background:var(--c-bg);border-radius:50%;width:32px;height:32px;cursor:pointer}.nav-account-btn:hover{border-color:var(--c-ink)}.nav-avatar{font-size:13px;font-weight:700;color:var(--c-ink);line-height:1}.nav-account-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:30;min-width:200px;background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--r-md);box-shadow:var(--shadow-soft);padding:6px;display:flex;flex-direction:column}.nav-account-email{font-family:var(--font-mono);font-size:11px;color:var(--c-ink-soft);padding:6px 10px 8px;border-bottom:1px solid var(--c-line);margin-bottom:4px;overflow:hidden;text-overflow:ellipsis}.nav-account-signout,.site-header nav .nav-account-menu a{display:block;width:100%;text-align:left;padding:8px 10px;border:0;background:transparent;border-radius:var(--r-sm);font:inherit;font-size:13px;color:var(--c-ink);text-decoration:none;cursor:pointer}.nav-account-signout:hover,.site-header nav .nav-account-menu a:hover{background:var(--c-line-soft);color:var(--c-ink)}.nav-account-signout{color:var(--c-ink-soft);border-top:1px solid var(--c-line);margin-top:4px}