.main-header{background:var(--bg-secondary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);transition:all .3s ease;position:sticky;top:0;z-index:100}.main-header--floating{position:fixed;top:0;left:0;right:0;width:100%;transform:translateY(0);transition:transform .22s ease,opacity .22s ease,background-color .2s ease,border-color .2s ease;pointer-events:auto}.main-header--floating.main-header--hidden{transform:translateY(-140%);opacity:0;pointer-events:none;height:0;padding:0;border:none;box-shadow:none;overflow:hidden}[data-theme=dark] .main-header--floating{background:var(--bg-primary)}[data-theme=dark] .main-header{background:var(--bg-primary);border-bottom:1px solid rgba(255,255,255,.12)}.header-content{max-width:1200px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center;position:relative}.main-header--with-back .header-content{padding-left:44px}.logo-section{display:flex;align-items:center;gap:16px}.logo-icon{width:40px;height:40px;border-radius:10px;display:block;-o-object-fit:cover;object-fit:cover;background:transparent;box-shadow:none!important;border:1px solid transparent}.logo-title{font-size:24px;font-weight:700;margin:0;color:var(--text-primary);background:linear-gradient(135deg,var(--accent-color),var(--success-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.logo-subtitle{font-size:12px;font-weight:500;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.header-nav{gap:12px}.header-nav,.nav-button{display:flex;align-items:center}.nav-button{background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:10px;padding:8px 16px;gap:8px;cursor:pointer;transition:all .3s ease;color:var(--text-secondary);font-weight:500;box-shadow:var(--shadow-sm)}.nav-button:hover{background:var(--accent-color);color:white;border-color:var(--accent-color);transform:translateY(-2px);box-shadow:var(--shadow-md)}.header-theme-toggle{background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:10px;padding:8px 12px;cursor:pointer;transition:all .3s ease;color:var(--text-secondary);font-weight:500;box-shadow:var(--shadow-sm);font-size:16px;display:flex;align-items:center;justify-content:center;min-width:44px;height:40px}.header-theme-toggle:hover{background:var(--accent-color);color:white;border-color:var(--accent-color);transform:translateY(-2px);box-shadow:var(--shadow-md)}.user-email-display{display:flex;align-items:center;padding:8px 12px;background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:10px;font-size:14px;color:var(--text-primary);font-weight:500}.nav-icon{font-size:16px}.nav-text{font-size:14px}.back-icon-button{position:absolute;left:8px;top:50%;transform:translateY(-50%);display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border:none;border-radius:9px;background:transparent;color:var(--text-secondary);cursor:pointer;transition:color .2s ease,background .2s ease,transform .2s ease;touch-action:manipulation;pointer-events:auto;z-index:150}.back-icon-button:hover{color:var(--accent-color);background:rgba(37,99,235,.12);transform:translateY(calc(-50% - 1px))}.back-icon-button:focus-visible{outline:2px solid var(--accent-color);outline-offset:2px}.back-icon{display:block}.logo-content{display:flex;flex-direction:column;gap:4px}.logo-link{text-decoration:none;color:inherit;cursor:pointer;border-radius:8px;display:inline-flex;align-items:center;gap:12px;padding:4px 6px}.logo-link:focus-visible{outline:2px solid var(--accent-color);outline-offset:2px}.language-selector-dropdown .ant-dropdown-menu{background:var(--bg-card);border:1px solid var(--border-color);box-shadow:var(--shadow-md)}.language-selector-dropdown .ant-dropdown-menu-item,.language-selector-dropdown .ant-dropdown-menu-title-content,.language-selector-dropdown .ant-dropdown-menu-title-content span{color:var(--text-primary)}.language-selector-dropdown .ant-dropdown-menu-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.language-selector-dropdown .ant-dropdown-menu-item-selected{background:rgba(37,99,235,.12);color:var(--accent-color)}[data-theme=dark] .language-selector-dropdown .ant-dropdown-menu-item-selected{background:rgba(37,99,235,.16)}.language-selector-dropdown .ant-dropdown-menu-title-content{display:flex;align-items:center;gap:8px}:root{--main-header-height:72px}@media (max-width:768px){:root{--main-header-height:64px}.header-content{padding:12px 16px}.main-header--with-back .header-content{padding-left:36px}.back-icon-button{left:4px;width:36px;height:36px}.logo-section{gap:12px}.logo-title{font-size:20px}.logo-icon{width:34px;height:34px;border-radius:8px}.header-nav{gap:8px}.nav-button{padding:6px 12px}.header-theme-toggle{padding:6px 10px;min-width:40px;height:36px;font-size:14px}.user-email-display{padding:6px 10px;font-size:13px}.nav-text{display:none}.nav-icon{font-size:18px}}@media (max-width:480px){:root{--main-header-height:64px}.header-content{flex-direction:column;gap:16px;align-items:stretch;padding-left:16px}.back-icon-button{position:static;transform:none;align-self:flex-start;margin-bottom:8px;width:32px;height:32px}.logo-section{justify-content:flex-start;text-align:left;align-self:stretch;width:100%}.logo-icon{width:30px;height:30px;border-radius:8px}.header-nav{justify-content:center;gap:6px;flex-wrap:wrap}.nav-button{padding:6px 10px;min-width:48px}.header-theme-toggle{padding:6px 10px;min-width:36px;height:32px;font-size:12px}}