:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", "Courier New", Courier, monospace;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.5rem;--font-size-2xl: 2rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--line-height-tight: 1.2;--line-height-base: 1.5;--line-height-relaxed: 1.75;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--space-3xl: 4rem;--color-bg: #f5f5f5;--color-bg-subtle: #f9f9f9;--color-surface: #fafafa;--color-text: #1a1a1a;--color-text-muted: #4b5563;--color-text-subtle: #6b7280;--color-border: #e5e7eb;--color-border-subtle: #f3f4f6;--color-shadow: rgba(0, 0, 0, .05);--color-accent: #1a1a1a;--color-success: #059669;--color-warning: #d97706;--color-error: #dc2626;--radius-sm: 2px;--radius-md: 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var(--space-md);border-radius:var(--radius-md);font-weight:var(--font-weight-medium);font-family:var(--font-mono);font-size:var(--font-size-base);cursor:pointer;transition:all var(--transition-fast);border:none;display:inline-flex;align-items:center;justify-content:center;min-height:44px}@media(max-width:640px){.btn{padding:var(--space-md) var(--space-lg);font-size:var(--font-size-base)}}.btn:active{transform:scale(.98)}.btn-primary{background:var(--color-text);color:var(--color-bg);border:1px solid var(--color-text)}.btn-primary:hover{opacity:.9}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--color-text-muted);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-border-subtle);border-color:var(--color-text-muted)}.btn-danger{background:transparent;color:var(--color-error);border:1px solid var(--color-error)}.btn-danger:hover{background:var(--color-error);color:#fff}.btn-compact{padding:var(--space-xs) var(--space-sm);font-size:var(--font-size-sm)}.btn-compact.btn-nav{padding:4px 8px;font-size:13px;min-height:auto}@media(max-width:640px){.btn-compact:not(.btn-nav){padding:var(--space-sm) var(--space-md);font-size:var(--font-size-base)}}.btn-link{background:transparent;color:var(--color-text-muted);border:none;text-decoration:underline;padding:0}.btn-link:hover{color:var(--color-text)}.btn-full{width:100%}:root{--danger-border-light: #d7263d;--danger-border-dark: #ff6b6b;--danger-text-light: #d7263d;--danger-text-dark: #ff6b6b}.danger-zone{background:var(--color-bg);border:2px solid var(--danger-border-light);border-radius:1rem;padding:2rem 1.5rem;margin-bottom:2.5rem;transition:border-color .2s;overflow:hidden}.danger-zone>*:last-child{margin-bottom:0!important}.settings-section.danger-zone{border-bottom:none}.danger-zone h2,.danger-zone .text-error{color:var(--danger-text-light);transition:color 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var(--space-sm))}.nav-link:hover{color:var(--color-text);border-bottom-color:var(--color-text);background:var(--color-border-subtle)}.nav-link:active{background:var(--color-border);transform:scale(.98)}.nav-center{position:absolute;left:50%;transform:translate(-50%);pointer-events:none;z-index:0}.nav-center .ascii-art{font-size:.7rem;line-height:1.1;margin:0;white-space:pre;font-family:monospace;-webkit-user-select:none;user-select:none;pointer-events:auto}.nav-user-section{display:flex;align-items:center;gap:var(--space-md);flex:1;justify-content:flex-end;position:relative;z-index:1}.nav-user-name{font-size:var(--font-size-sm);color:var(--color-text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:120px}.nav-auth-buttons{display:flex;gap:var(--space-xs);flex-shrink:0}.settings-btn{background:transparent;border:1px solid var(--color-border);color:var(--color-text-muted);font-size:20px;width:32px;height:32px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.settings-btn:hover{background:var(--color-border-subtle);border-color:var(--color-text-muted);color:var(--color-text)}.settings-btn:active{background:var(--color-border);transform:scale(.95)}.theme-toggle{display:flex;align-items:center}.theme-toggle-btn{background:transparent;border:1px solid var(--color-border);color:var(--color-text);font-size:var(--font-size-lg);width:32px;height:32px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.theme-toggle-btn:hover{background:var(--color-border-subtle);border-color:var(--color-text-muted)}.theme-toggle-btn:active{background:var(--color-border);transform:scale(.95)}@media(prefers-color-scheme:light){.theme-toggle-btn.active{background:#00000021;color:inherit;outline:none}}.light .theme-toggle-btn.active{background:#00000021;color:inherit;outline:none}@media(prefers-color-scheme:dark){.theme-toggle-btn.active{background:#ffffff21;color:inherit;outline:none}}.dark .theme-toggle-btn.active{background:#ffffff21;color:inherit;outline:none}@media(max-width:768px){.nav-container{flex-direction:column;align-items:stretch;gap:var(--space-md)}.nav-center{position:static;transform:none;order:0;display:flex;justify-content:center;pointer-events:auto}.nav-links{justify-content:center;order:2}.nav-user-section{order:1;justify-content:center}.nav-auth-buttons{justify-content:center}.nav-user-name{max-width:none}}.message{padding:.75rem var(--space-md);border-radius:var(--radius-lg);margin-bottom:var(--space-md);font-size:var(--font-size-sm)}.message-success{background:#d1fae5;color:var(--color-success);border:1px solid #6ee7b7}.theme-toggle-btn.active{background:#00000021;color:inherit;box-shadow:none;outline:none;transition:background .15s}html[data-theme=dark] .theme-toggle-btn.active,body[data-theme=dark] .theme-toggle-btn.active{background:#ffffff21}.banner-content{display:flex;align-items:center;justify-content:space-between;gap:.75rem}.banner-text{flex:1;color:var(--color-text)}.banner-dismiss:hover{color:var(--color-text);background:var(--color-border-subtle);border-color:var(--color-text-muted)}