:root{--color-primary: #7C3AED;--color-primary-hover: #6D28D9;--color-primary-active: #5B21B6;--color-text-primary: #2C3E50;--color-text-secondary: #7F8C8D;--color-text-link: #7C3AED;--color-text-link-hover: #6D28D9;--color-background: #F5F6F7;--color-surface: #FFFFFF;--color-input-background: #E8ECEF;--color-input-border: #D1D8DD;--color-input-focus: #7C3AED;--color-input-text: #2C3E50;--color-input-placeholder: #95A5A6;--color-error: #E74C3C;--color-success: #27AE60;--color-warning: #F39C12;--color-info: #3498DB;--color-gray-100: #F8F9FA;--color-gray-200: #E9ECEF;--color-gray-300: #DEE2E6;--color-gray-400: #CED4DA;--color-gray-500: #ADB5BD;--color-gray-600: #6C757D;--color-gray-700: #495057;--color-gray-800: #343A40;--color-gray-900: #212529;--font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;--font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;--font-size-title: 28px;--font-size-heading: 20px;--font-size-base: 16px;--font-size-small: 14px;--font-size-label: 16px;--font-size-button: 18px;--font-size-link: 14px;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-bold: 700;--line-height-tight: 1.2;--line-height-base: 1.5;--line-height-relaxed: 1.8;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--spacing-3xl: 64px;--container-width-sm: 400px;--container-width-md: 640px;--container-width-lg: 960px;--container-width-xl: 1280px;--border-radius-sm: 4px;--border-radius-md: 8px;--border-radius-lg: 12px;--border-radius-full: 9999px;--border-width-thin: 1px;--border-width-medium: 2px;--border-width-thick: 3px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--transition-fast: .1s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--z-index-dropdown: 1000;--z-index-sticky: 1020;--z-index-fixed: 1030;--z-index-modal-backdrop: 1040;--z-index-modal: 1050;--z-index-popover: 1060;--z-index-tooltip: 1070;--z-index-toast: 9999}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family-base);font-size:var(--font-size-base);line-height:var(--line-height-base);color:var(--color-text-primary);background-color:var(--color-background);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.auth-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-lg)}.app-header{position:absolute;top:0;left:0;right:0;padding:var(--spacing-lg);text-align:center}.app-title{font-size:var(--font-size-heading);font-weight:var(--font-weight-bold);color:var(--color-primary);margin:0;letter-spacing:.05em}.auth-card{width:100%;max-width:var(--container-width-md);background-color:var(--color-surface);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-lg);padding:var(--spacing-2xl)}.page-title{font-size:var(--font-size-title);font-weight:var(--font-weight-bold);color:var(--color-text-primary);text-align:center;margin-bottom:var(--spacing-xl);line-height:var(--line-height-tight)}.form-field{margin-bottom:var(--spacing-lg)}.form-label{display:block;font-size:var(--font-size-label);font-weight:var(--font-weight-medium);color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.form-input{width:100%;padding:12px 16px;font-size:var(--font-size-base);font-family:var(--font-family-base);color:var(--color-input-text);background-color:var(--color-input-background);border:var(--border-width-thin) solid var(--color-input-border);border-radius:var(--border-radius-md);transition:all var(--transition-base);outline:none}.form-input::placeholder{color:var(--color-input-placeholder)}.form-input:focus{border-color:var(--color-input-focus);background-color:var(--color-surface);box-shadow:0 0 0 3px #7c3aed1a}.form-input:disabled{background-color:var(--color-gray-200);cursor:not-allowed;opacity:.6}.form-input.error{border-color:var(--color-error);background-color:#fff5f5}.form-input.error:focus{box-shadow:0 0 0 3px #e74c3c1a}.form-error{display:block;margin-top:var(--spacing-sm);font-size:var(--font-size-small);color:var(--color-error);line-height:var(--line-height-base);animation:slideDown .2s ease}@keyframes slideDown{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.app-button{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-xs);padding:12px 20px;font-size:var(--font-size-base);font-weight:var(--font-weight-medium);font-family:var(--font-family-base);color:#fff;background-color:var(--color-primary);border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:transform var(--transition-base),box-shadow var(--transition-base),background-color var(--transition-base),opacity var(--transition-base);text-decoration:none;line-height:1.2}.app-button.small{padding:8px 16px;font-size:var(--font-size-small)}.app-button.wide{width:100%}.app-button:not(:disabled):hover{background-color:var(--color-primary-hover);box-shadow:0 6px 12px #7c3aed40;transform:translateY(-1px)}.app-button:not(:disabled):active{background-color:var(--color-primary-active);transform:translateY(0);box-shadow:0 3px 6px #7c3aed33}.app-button:focus-visible{outline:none;box-shadow:0 0 0 3px #7c3aed59}.app-button:disabled{background-color:#fff;color:var(--color-gray-500);border:1px solid var(--color-gray-300);cursor:not-allowed;box-shadow:none;transform:none;opacity:1}.app-button--link{background-color:transparent;color:var(--color-text-link);border:1px solid var(--color-gray-300)}.app-button--link:hover{background-color:var(--color-gray-100);color:var(--color-text-link-hover);box-shadow:none;transform:none}.app-button--link:disabled{color:var(--color-gray-500);border-color:var(--color-gray-300);background-color:var(--color-gray-100)}.app-button--danger{background-color:#dc2626}.app-button--danger:not(:disabled):hover{background-color:#b91c1c;box-shadow:0 6px 12px #dc262640}.app-button--danger:not(:disabled):active{background-color:#991b1b;box-shadow:0 3px 6px #dc262633}.app-button.loading{position:relative;color:transparent;pointer-events:none}.app-button.loading:after{content:"";position:absolute;width:18px;height:18px;top:50%;left:50%;margin-left:-9px;margin-top:-9px;border:2px solid rgba(255,255,255,.8);border-top-color:transparent;border-radius:50%;animation:spinner .6s linear infinite}@keyframes spinner{to{transform:rotate(360deg)}}.form-link{display:inline-block;font-size:var(--font-size-link);color:var(--color-text-link);text-decoration:none;transition:color var(--transition-base)}.form-link:hover{color:var(--color-text-link-hover);text-decoration:underline}.form-link:focus{outline:2px solid var(--color-primary);outline-offset:2px}.form-checkbox{display:flex;align-items:center;gap:var(--spacing-sm);margin:var(--spacing-md) 0}.form-checkbox input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--color-primary)}.form-checkbox label{font-size:var(--font-size-base);color:var(--color-text-primary);cursor:pointer;-webkit-user-select:none;user-select:none}.alert{display:flex;gap:12px;padding:16px;border-radius:var(--border-radius-md);margin-bottom:var(--spacing-lg);animation:fadeIn .3s ease}.alert-error{background-color:#fff5f5;border:var(--border-width-thin) solid #FEB2B2;color:#c53030}.alert-success{background-color:#f0fff4;border:var(--border-width-thin) solid #9AE6B4;color:#276749}.alert-warning{background-color:#fffaf0;border:var(--border-width-thin) solid #FBD38D;color:#c05621}.alert-info{background-color:#ebf8ff;border:var(--border-width-thin) solid #90CDF4;color:#2c5282}.alert-icon{font-size:24px;flex-shrink:0}.alert-content{flex:1}.alert-title{font-size:var(--font-size-base);font-weight:var(--font-weight-bold);margin:0 0 4px}.alert-message{font-size:var(--font-size-small);margin:0;line-height:var(--line-height-base)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.auth-footer{margin-top:var(--spacing-2xl);padding-top:var(--spacing-xl);text-align:center;font-size:var(--font-size-small);color:var(--color-text-secondary);border-top:var(--border-width-thin) solid var(--color-gray-300)}.text-center{text-align:center}.text-right{text-align:right}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mt-xl{margin-top:var(--spacing-xl)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mb-xl{margin-bottom:var(--spacing-xl)}*:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media (max-width: 768px){.auth-card{padding:var(--spacing-lg)}.page-title{font-size:24px}}