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12px;--font-size-base: 14px;--font-size-md: 15px;--font-size-lg: 16px;--font-size-xl: 18px;--font-size-2xl: 22px;--font-size-3xl: 28px;--font-size-4xl: 36px;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.25;--line-height-normal: 1.5;--line-height-relaxed: 1.75;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .1);--shadow-xl: 0 16px 40px rgba(0, 0, 0, .14);--float-shadow: 0 4px 24px rgba(0, 0, 0, .06), 0 1px 4px rgba(0, 0, 0, .04);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--sidebar-width: 260px;--sidebar-collapsed-width: 68px;--header-height: 60px;--max-content-width: 1200px;--z-sidebar: 100;--z-header: 200;--z-dropdown: 300;--z-modal: 400;--z-toast: 500}:root,[data-theme=light]{color-scheme:light;--text-primary: #1E293B;--text-secondary: #64748B;--text-tertiary: #94A3B8;--text-inverse: #FFFFFF;--text-link: var(--primary-500);--text-on-primary: #FFFFFF;--success: #10B981;--success-light: #ECFDF5;--error: #EF4444;--error-light: #FEF2F2;--warning: #F59E0B;--warning-light: #FFFBEB;--info: #06B6D4;--info-light: #ECFEFF}[data-theme=dark]{color-scheme:dark;--text-primary: #F1F5F9;--text-secondary: #94A3B8;--text-tertiary: #64748B;--text-inverse: #0f172a;--text-link: var(--primary-400);--text-on-primary: #FFFFFF;--success: #34D399;--success-light: rgba(16, 185, 129, .12);--error: #F87171;--error-light: rgba(239, 68, 68, .12);--warning: #FBBF24;--warning-light: rgba(245, 158, 11, .12);--info: #22D3EE;--info-light: rgba(6, 182, 212, 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var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn-primary{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:var(--text-on-primary);box-shadow:0 2px 8px var(--shadow-glow)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 14px var(--shadow-glow)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-secondary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-icon{position:relative;transition:all var(--transition-fast)}.btn-icon.btn-ghost{border:1px solid transparent}.btn-icon.btn-ghost:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;opacity:0;transition:opacity 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var(--border-color);border-radius:var(--radius-md);outline:none;caret-color:var(--primary-500);transition:all var(--transition-fast)}.input:focus{border-color:var(--primary-400);box-shadow:0 0 0 3px var(--mail-unread-bg, var(--primary-100))}.input::placeholder{color:var(--text-tertiary)}.input-error{border-color:var(--error);box-shadow:0 0 0 3px #ef444414}textarea{caret-color:var(--primary-500)}.card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-fast)}.card:hover{border-color:var(--primary-200);box-shadow:var(--shadow-md)}.badge{display:inline-flex;align-items:center;justify-content:center;padding:2px 8px;font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);border-radius:var(--radius-full);line-height:1.4}.badge-primary{background:var(--primary-100);color:var(--primary-700)}.badge-success{background:var(--success-light);color:var(--success)}.badge-error{background:var(--error-light);color:var(--error)}.badge-warning{background:var(--warning-light);color:#b45309}.badge-dot{width:8px;height:8px;min-width:8px;padding:0;border-radius:50%}.spinner{display:inline-block;width:20px;height:20px;border:2.5px solid var(--border-color);border-top-color:var(--primary-500);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-hover) 50%,var(--bg-tertiary) 75%);background-size:200% 100%;animation:skeleton-loading 1.5s ease-in-out infinite;border-radius:var(--radius-sm)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.text-center{text-align:center}.text-right{text-align:right}.text-muted{color:var(--text-tertiary)}.text-success{color:var(--success)}.text-error{color:var(--error)}.text-warning{color:var(--warning)}.text-truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.font-medium{font-weight:var(--font-weight-medium)}.font-semibold{font-weight:var(--font-weight-semibold)}.mt-sm{margin-top:var(--space-sm)}.mt-md{margin-top:var(--space-md)}.mt-lg{margin-top:var(--space-lg)}.mb-sm{margin-bottom:var(--space-sm)}.mb-md{margin-bottom:var(--space-md)}.mb-lg{margin-bottom:var(--space-lg)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}@media (max-width: 1024px){.app-main{margin-left:0!important}:root{--sidebar-width: 260px;--sidebar-collapsed-width: 0}.app-sidebar{position:fixed!important;left:-280px;z-index:var(--z-sidebar);box-shadow:none;transition:left var(--transition-slow)}.app-sidebar.open{left:0;box-shadow:var(--shadow-xl)}}@media (max-width: 768px){:root{--header-height: 56px;--font-size-base: 14px}.app-content{padding:16px}.btn{padding:7px 14px;font-size:var(--font-size-sm)}.btn-lg{padding:9px 18px}.input{padding:9px 12px}.card{padding:var(--space-md)!important;border-radius:var(--radius-md)}.mail-item{padding:var(--space-sm) var(--space-md)!important}}@media (max-width: 480px){.app-content{padding:12px}.btn{padding:6px 12px;border-radius:var(--radius-sm)}}@media print{.app-sidebar,.app-header,.no-print{display:none!important}.app-main{margin-left:0!important}body{background:#fff;color:#000}}