.app-header { background: #1a1a2e; color: #fff; padding: 0 24px; height: 56px; display: flex; align-items: center; box-shadow: 0 1px 3px rgba(0,0,0,0.2); position: sticky; top: 0; z-index: 1000; }
.header-inner { width: 100%; max-width: 1400px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.header-left { display: flex; align-items: center; gap: 12px; }
.header-back { color: rgba(255,255,255,0.7); display: flex; align-items: center; text-decoration: none; padding: 4px; border-radius: 4px; transition: all 0.15s ease; }
.header-back:hover { color: #fff; background: rgba(255,255,255,0.1); }
.header-brand { font-size: 16px; font-weight: 600; color: #fff; text-decoration: none; letter-spacing: 0.02em; }
.header-right { display: flex; align-items: center; gap: 16px; }
.header-user { font-size: 13px; color: rgba(255,255,255,0.7); }
.logout-form { display: inline; }
.btn-logout { background: transparent; border: 1px solid rgba(255,255,255,0.3); color: rgba(255,255,255,0.8); padding: 5px 14px; border-radius: 4px; font-size: 13px; cursor: pointer; transition: all 0.15s ease; }
.btn-logout:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.5); color: #fff; }