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#f9731666}.btn-print-sidebar:active:not(:disabled){transform:translateY(0)}.preview{flex:1;min-width:0;display:flex;flex-direction:column;gap:var(--space-4);max-height:calc(100vh - var(--space-16));overflow:hidden}.preview-header{display:flex;align-items:center;justify-content:space-between;background:var(--bg-secondary);padding:var(--space-3) var(--space-4);border-radius:var(--radius-2xl);box-shadow:var(--shadow-md);border:1px solid var(--gray-200);flex-wrap:wrap;gap:var(--space-3);min-height:50px}.preview-header:empty{display:none}.question-count{font-size:.8125rem;color:var(--primary-700);background:var(--primary-100);padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);white-space:nowrap;font-weight:500;flex-shrink:0}.preview-header-actions{display:flex;align-items:center;gap:var(--space-2)}.btn-icon-action{width:38px;height:38px;display:flex;align-items:center;justify-content:center;background:var(--gray-50);border:1px solid 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infinite}.error-message{display:flex;align-items:flex-start;gap:10px;padding:13px 15px;background:linear-gradient(135deg,#fef2f2,#fee2e2);border:1px solid #fecaca;border-radius:12px;color:#dc2626;font-size:.8125rem;margin-top:18px;animation:shake .45s cubic-bezier(.36,.07,.19,.97)}.error-message svg{width:16px;height:16px;flex-shrink:0;color:#ef4444}@keyframes shake{0%,to{transform:translate(0)}15%{transform:translate(-10px)}30%{transform:translate(8px)}45%{transform:translate(-6px)}60%{transform:translate(4px)}75%{transform:translate(-2px)}}@media(max-width:480px){.login-modal-overlay{padding:12px}.login-modal{max-height:100vh;border-radius:20px}.login-modal-header{padding:32px 20px 20px}.login-modal-form{padding:0 20px 24px}.login-modal-logo{width:56px;height:56px}.login-modal-logo svg{width:28px;height:28px}.login-modal-header h2{font-size:1.25rem}}:root{--primary-50: #fff7ed;--primary-100: #ffedd5;--primary-200: #fed7aa;--primary-300: #fdba74;--primary-400: #fb923c;--primary-500: #f97316;--primary-600: #ea580c;--primary-700: #c2410c;--accent-50: #fff7ed;--accent-100: #ffedd5;--accent-200: #fed7aa;--accent-300: #fdba74;--accent-400: #fb923c;--accent-500: #f97316;--accent-600: #ea580c;--accent-700: #c2410c;--success-50: #f0fdf4;--success-100: #dcfce7;--success-200: #bbf7d0;--success-300: #86efac;--success-400: #4ade80;--success-500: #22c55e;--success-600: #16a34a;--success-700: #15803d;--error-50: #fef2f2;--error-100: #fee2e2;--error-200: #fecaca;--error-300: #fca5a5;--error-400: #f87171;--error-500: #ef4444;--error-600: #dc2626;--error-700: #b91c1c;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--bg-primary: #fffdf9;--bg-secondary: #ffffff;--bg-elevated: #ffffff;--bg-warm: #fffdf9;--bg-soft: #fff9f5;--gradient-primary: linear-gradient(135deg, #ff6b4a 0%, #ff8a65 100%);--gradient-primary-light: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);--gradient-bg: linear-gradient(180deg, #fffdf9 0%, #fff5f0 100%);--gradient-hero: linear-gradient(180deg, #fff5f0 0%, #fff9f5 50%, #fffdf9 100%);--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, .03);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .06), 0 1px 2px -1px rgba(0, 0, 0, .06);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .06);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .08), 0 8px 10px -6px rgba(0, 0, 0, .04);--shadow-primary: 0 4px 14px rgba(255, 107, 74, .3);--shadow-primary-hover: 0 6px 20px rgba(255, 107, 74, .4);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-2xl: 28px;--radius-full: 9999px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--safe-area-top: env(safe-area-inset-top, 0px);--safe-area-bottom: env(safe-area-inset-bottom, 0px);--safe-area-left: env(safe-area-inset-left, 0px);--safe-area-right: env(safe-area-inset-right, 0px)}.loading-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--gradient-bg)}.loading-content{text-align:center;color:var(--gray-700)}.loading-logo{width:80px;height:80px;margin:0 auto var(--space-6);background:var(--gradient-primary);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:var(--shadow-primary);animation:pulse 2s ease-in-out infinite}.loading-logo svg{width:48px;height:48px}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.05);opacity:.9}}.loading-content p{font-size:1.25rem;font-weight:600;color:var(--gray-700);margin-bottom:var(--space-6)}.loading-spinner{width:32px;height:32px;margin:0 auto;border:3px solid var(--primary-100);border-top-color:var(--primary-500);border-radius:50%;animation:spin .8s linear infinite}.history-dropdown-loading{padding:var(--space-8) var(--space-4);text-align:center;color:var(--gray-500);font-size:.9375rem}.history-dropdown-loading-more{padding:var(--space-3) var(--space-4);text-align:center;color:var(--gray-500);font-size:.8125rem;background:var(--gray-50)}.history-dropdown-empty{padding:var(--space-10) var(--space-4);text-align:center}.history-dropdown-empty p{color:var(--gray-500);font-size:.9375rem;margin-bottom:var(--space-4)}.history-dropdown-empty a{color:var(--primary-600);text-decoration:none;font-weight:500;font-size:.9375rem}.history-dropdown-empty a:hover{color:var(--primary-700)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--gray-100);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}button:focus-visible,a:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}.question-print-mode{--question-padding: 0;--question-margin-bottom: 16px;--question-background: transparent;--question-border: 1px solid #ddd;--question-box-shadow: none;--question-border-radius: 0;--question-number-font-weight: bold;--question-number-color: #000;--question-number-min-width: 24px;--question-stem-font-size: 10.5pt;--question-stem-line-height: 1.8;--question-stem-color: #000;--option-background: transparent;--option-border-radius: 0;--option-padding: 4px 0;--option-margin: 4px 0;--option-label-font-weight: bold;--option-text-color: #000;--answer-area-background: transparent;--answer-area-min-height: 40px;--answer-area-border-radius: 0;--answer-area-margin-top: 8px;--answer-placeholder-color: #000;--answer-placeholder-style: solid;--answer-placeholder-width: 200px;--passage-background: transparent;--passage-border-left: 2px solid #000;--passage-padding: 8px 0;--passage-title-color: #000;--passage-title-font-size: 10.5pt;--essay-line-height: 28px;--essay-line-border: 1px dashed #999;--essay-line-number-width: 20px;--essay-line-number-font-size: 6pt}.question-render-mode{--question-padding: 16px;--question-margin-bottom: 24px;--question-background: white;--question-border: 1px solid #f0f0f0;--question-box-shadow: 0 2px 8px rgba(0, 0, 0, .04);--question-border-radius: 12px;--question-number-font-weight: 700;--question-number-color: #ff6b4a;--question-number-min-width: 28px;--question-stem-font-size: 1rem;--question-stem-line-height: 1.6;--question-stem-color: #262626;--option-background: #fafafa;--option-border-radius: 8px;--option-padding: 8px 12px;--option-margin: 8px 0;--option-label-font-weight: 600;--option-text-color: #262626;--answer-area-background: #fafafa;--answer-area-min-height: 60px;--answer-area-border-radius: 8px;--answer-area-margin-top: 12px;--answer-placeholder-color: #a1a1aa;--answer-placeholder-style: dotted;--answer-placeholder-width: auto;--passage-background: #fff7ed;--passage-border-left: 4px solid #ff6b4a;--passage-padding: 16px;--passage-title-color: #c2410c;--passage-title-font-size: 1rem;--essay-line-height: 32px;--essay-line-border: 1px dashed #e5e5e5;--essay-line-number-width: 32px;--essay-line-number-font-size: .75rem}@media print{.question-print-mode{page-break-inside:avoid}.screen-only{display:none!important}.print-only{display:block!important}.option-item:hover{background:transparent!important}.essay-line{break-inside:avoid}}.question-print-mode.question-single-choice .question-options,.question-print-mode.question-multiple-choice .question-options{padding-left:36px}.question-print-mode.question-true-false .question-options{display:flex;gap:24px;padding-left:36px}.question-print-mode.question-fill-blank .answer-line{margin-top:8px}.question-print-mode.question-fill-blank .answer-placeholder{display:inline-block;min-width:var(--answer-placeholder-width);border-bottom:1px var(--answer-placeholder-style) var(--answer-placeholder-color)}.question-print-mode.question-calculation .answer-area,.question-print-mode.question-word-problem .answer-area,.question-print-mode.question-geometry .answer-area{margin-top:var(--answer-area-margin-top);min-height:var(--answer-area-min-height)}.question-print-mode.question-read-comp .passage-section{margin:12px 0;padding:8px 0;background:var(--passage-background);border-left:var(--passage-border-left)}.question-print-mode.question-read-comp .sub-questions{padding-left:20px;border-left:1px solid #ddd}.question-print-mode.question-cloze .passage-section{margin:12px 0;padding:8px 0}.question-print-mode.question-essay .essay-grid{margin-top:12px}.question-print-mode.question-essay .essay-line{height:var(--essay-line-height);border-bottom:var(--essay-line-border)}.question-print-mode.question-essay .line-number{width:var(--essay-line-number-width);font-size:var(--essay-line-number-font-size)}.question-item{margin-bottom:var(--question-margin-bottom, 24px);padding:var(--question-padding, 16px);background:var(--question-background, white);border-radius:var(--question-border-radius, 12px);border:var(--question-border, 1px solid #f0f0f0);box-shadow:var(--question-box-shadow, 0 2px 8px rgba(0, 0, 0, .04))}.question-header{display:flex;align-items:flex-start;gap:8px;margin-bottom:8px}.question-number{font-weight:var(--question-number-font-weight, 700);color:var(--question-number-color, #ff6b4a);font-size:1rem;line-height:1.6;min-width:var(--question-number-min-width, 28px);flex-shrink:0}.question-stem{flex:1;font-size:var(--question-stem-font-size, 1rem);line-height:var(--question-stem-line-height, 1.6);color:var(--question-stem-color, #262626);font-weight:500}.question-stem>*{display:inline!important;margin:0!important}.question-stem br{display:none!important}.question-options{margin-top:12px;padding-left:44px}.option-item{margin:var(--option-margin, 8px 0);padding:var(--option-padding, 8px 12px);background:var(--option-background, #fafafa);border-radius:var(--option-border-radius, 8px);display:flex;align-items:flex-start;gap:8px;transition:all .2s ease}.option-item:hover{background:var(--option-hover-background, #ffedd5)}.option-label{font-weight:var(--option-label-font-weight, 600);color:var(--option-label-color, #525252);min-width:36px}.option-text{flex:1;color:var(--option-text-color, #262626);line-height:1.6;display:inline}.option-text p{display:inline;margin:0}.option-text br{display:none}.question-fill-blank .answer-line{margin-top:8px;padding:0;background:var(--answer-area-background, #fafafa);border-radius:var(--answer-area-border-radius, 8px)}.answer-placeholder{color:var(--answer-placeholder-color, #a1a1aa);font-family:monospace;font-size:.9rem;display:inline-block;min-width:var(--answer-placeholder-width, auto);border-bottom:1px var(--answer-placeholder-style, dotted) var(--answer-placeholder-color, #a1a1aa)}.answer-area{margin-top:var(--answer-area-margin-top, 12px);padding:12px;background:var(--answer-area-background, #fafafa);border-radius:var(--answer-area-border-radius, 8px);min-height:var(--answer-area-min-height, 60px)}.question-read-comp{padding:20px}.passage-section{margin:16px 0;padding:var(--passage-padding, 16px);background:var(--passage-background, #fff7ed);border-radius:8px;border-left:var(--passage-border-left, 4px solid #ff6b4a)}.passage-title{font-weight:600;color:var(--passage-title-color, #c2410c);margin-bottom:8px;font-size:var(--passage-title-font-size, 1rem)}.passage-content{font-size:.9375rem;line-height:1.8;color:#262626}.sub-questions{margin-top:16px;padding-left:20px;border-left:2px solid #f0f0f0}.question-sub{margin-bottom:12px;padding:10px;background:transparent;box-shadow:none}.question-cloze{padding:20px}.question-essay .answer-area{padding:0;background:transparent}.essay-answer{margin-top:12px}.essay-grid{background:var(--essay-grid-background, #fafafa);border-radius:8px;overflow:hidden}.essay-line{display:flex;height:var(--essay-line-height, 32px);border-bottom:var(--essay-line-border, 1px dashed #e5e5e5)}.essay-line:last-child{border-bottom:none}.line-number{display:flex;align-items:center;justify-content:center;width:var(--essay-line-number-width, 32px);font-size:var(--essay-line-number-font-size, .75rem);color:var(--essay-line-number-color, #a1a1aa);background:var(--essay-line-number-background, #f5f5f5);flex-shrink:0}.question-loading{display:flex;align-items:center;justify-content:center;gap:12px;padding:40px;color:#737373}.loading-spinner{width:24px;height:24px;border:3px solid #f0f0f0;border-top-color:#ff6b4a;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.question-error{padding:20px;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;color:#dc2626}@media(max-width:768px){.question-item{padding:14px}.question-header{gap:8px}.question-number{font-size:1rem;min-width:28px}.question-stem{font-size:.9375rem}.question-options{padding-left:36px}.option-item{padding:6px 8px}.passage-content{font-size:.875rem}.essay-line{height:24px}.line-number{width:24px;font-size:.7rem}}@media print{.question-item{page-break-inside:avoid}.question-print-mode{--option-hover-background: transparent}.option-item:hover{background:transparent!important}.essay-line{break-inside:avoid}}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,Microsoft YaHei,PingFang SC,Hiragino Sans GB,sans-serif;background:var(--bg-primary);color:var(--gray-800);line-height:1.6;min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;color:var(--gray-900)}h1{font-size:1.75rem}h2{font-size:1.5rem}h3{font-size:1.25rem}p{margin-bottom:1rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}