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var(--color-border-tertiary);flex-direction:column;align-items:flex-start;gap:2px;margin-top:-16px;margin-bottom:0;padding-top:16px;padding-bottom:10px;display:flex;position:sticky;top:0}.app-header-row2{align-items:center;gap:12px;width:100%;display:flex}.app-header-row2 .app-header-actions{margin-left:auto}.app-header-actions{align-items:center;gap:4px;margin-left:auto;display:flex}.header-btn{border-radius:var(--border-radius-sm);color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;align-items:center;gap:4px;padding:4px 10px;font-size:12px;display:flex}.header-btn:hover{background:var(--color-background-secondary);color:var(--color-text-primary)}.btn-logout{border:1px solid var(--color-border,#444);color:var(--color-text-secondary,#999);cursor:pointer;background:0 0;border-radius:6px;margin-left:8px;padding:4px 12px;font-size:13px}.btn-logout:hover{color:var(--color-text-primary);border-color:var(--color-text-primary)}.app-title{letter-spacing:-.01em;color:var(--color-text-primary);font-size:22px;font-weight:600}.app-title-accent{color:var(--color-mastery-mastered)}.app-subtitle{color:var(--color-text-tertiary);letter-spacing:.04em;font-size:12px}.app-body{gap:28px;height:calc(100vh - 82px);display:flex;overflow:hidden}.app-sidebar{flex-shrink:0;width:336px;padding-top:16px;overflow-y:auto}.app-main{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.app-stats{flex-shrink:0;width:300px;padding-top:16px;overflow-y:auto}.loading{text-align:center;color:var(--color-text-tertiary);padding:40px 0;font-size:13px}.login-page{background:var(--color-background-primary);justify-content:center;align-items:center;min-height:100vh;display:flex}.login-card{background:var(--color-background-secondary);border:1px solid var(--color-border-tertiary);border-radius:var(--border-radius-md);flex-direction:column;align-items:center;gap:12px;padding:40px 48px;display:flex}.login-logo{width:96px;height:auto;image-rendering:pixelated;margin-bottom:4px}.login-card .app-title{letter-spacing:-.01em;color:var(--color-text-primary);font-size:22px;font-weight:600}.login-subtitle{color:var(--color-text-secondary);margin:0;font-size:14px}.login-error{color:var(--color-difficulty-hard);margin:0;font-size:13px}.btn-google-login{background:var(--color-mastery-mastered);color:var(--color-mastery-mastered-text);border-radius:var(--border-radius-md);cursor:pointer;border:none;width:100%;margin-top:8px;padding:9px 28px;font-size:14px;font-weight:500}.btn-google-login:hover:not(:disabled){background:var(--color-mastery-okay);color:var(--color-mastery-okay-text)}.btn-google-login:disabled{opacity:.6;cursor:not-allowed}