:root{--bg-primary: #faf8f9;--bg-secondary: #ffffff;--bg-tertiary: #f5f3f4;--bg-card: #ffffff;--bg-sidebar: rgba(255, 255, 255, .85);--bg-hover: rgba(0, 0, 0, .04);--bg-active: rgba(255, 139, 37, .1);--text-primary: #1a1a1a;--text-secondary: #6b7280;--text-accent: #ff8b25;--border-color: rgba(0, 0, 0, .08);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 24px;--green: #34c759;--red: #ff3b30;--blue: #007aff;--orange: #ff9500;--accent: #e89316}[data-theme=dark]{--bg-primary: #0a0a0f;--bg-secondary: #141418;--bg-tertiary: #1c1c22;--bg-card: #1c1c22;--bg-sidebar: rgba(28, 28, 34, .92);--bg-hover: rgba(255, 255, 255, .06);--bg-active: rgba(255, 139, 37, .15);--text-primary: #f0f0f0;--text-secondary: #888;--border-color: rgba(255, 255, 255, .08);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--accent: 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env(safe-area-inset-bottom,0px));background:var(--bg-primary);position:relative}.main-content>*:not(.simultech-wrapper):not(.exam-launch-bg):not(.exam-upload-complete){max-width:1200px;margin-left:auto;margin-right:auto}.page-title{font-size:36px;font-weight:700;letter-spacing:-.5px;margin-bottom:4px}.page-subtitle{color:var(--text-secondary);font-size:14px;margin-bottom:24px}.home-top-row{display:flex;gap:16px;margin-bottom:16px;align-items:stretch}.home-left-col{flex:2;min-width:0;display:flex;flex-direction:column;gap:16px}.home-widgets-row{display:flex;gap:16px;flex:1;align-items:stretch}.home-widget-cell,.home-calendar-col{flex:1;min-width:0}@media(max-width:768px){.home-top-row,.home-widgets-row{flex-direction:column}}.card-surface{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:16px;transition:box-shadow 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.15s}.exam-nav-btn.current{border-color:var(--text-accent);background:var(--bg-active);color:var(--text-accent)}.exam-nav-btn.answered{background:var(--blue);color:#fff;border-color:var(--blue)}.exam-nav-btn.flagged{background:var(--orange);color:#fff;border-color:var(--orange)}.toggle-switch{position:relative;width:44px;height:24px;background:var(--bg-tertiary);border-radius:12px;cursor:pointer;transition:background .2s;border:1px solid var(--border-color)}.toggle-switch.active{background:var(--green);border-color:var(--green)}.toggle-switch:after{content:"";position:absolute;width:20px;height:20px;border-radius:50%;background:#fff;top:1px;left:1px;transition:transform .2s;box-shadow:0 1px 3px #0003}.toggle-switch.active:after{transform:translate(20px)}.flashcard-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:500px;perspective:1000px}.flashcard{width:100%;max-width:560px;min-height:320px;position:relative;cursor:pointer;transform-style:preserve-3d;transition:transform .5s ease}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;font-size:18px;line-height:1.6}.flashcard-back{transform:rotateY(180deg)}.flashcard-label{position:absolute;top:16px;left:20px;font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px}.deck-list-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:var(--radius-md);cursor:pointer;transition:all .15s;border:1px solid transparent}.deck-list-item:hover{background:var(--bg-hover);border-color:var(--border-color)}.deck-list-item.active{background:var(--bg-active);border-color:var(--text-accent)}.deck-list-item{border-bottom:1px solid var(--border-color)}.deck-list-item:last-child{border-bottom:none}.deck-list-item .star{color:var(--orange);font-size:16px;cursor:pointer}.deck-list-actions{display:flex;gap:4px;opacity:0;transition:opacity .15s}.deck-list-item:hover .deck-list-actions{opacity:1}.deck-list-action-btn{display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:6px;color:var(--text-secondary);background:transparent;cursor:pointer;transition:all .15s}.deck-list-action-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.deck-list-delete-btn:hover{color:var(--red);background:#ff3b301a}.export-popover{position:absolute;top:calc(100% + 6px);right:0;z-index:1000;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:10px;padding:4px;min-width:220px;box-shadow:0 8px 24px #0000002e}.export-popover-item{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;padding:8px 12px;font-size:13px;font-weight:500;color:var(--text-primary);border-radius:6px;border:none;background:none;cursor:pointer;text-align:left;white-space:nowrap}.export-popover-item:hover{background:var(--bg-hover)}.export-popover-submenu{position:relative}.export-popover-parent{cursor:default}.export-popover-sub{display:none;position:absolute;right:calc(100% + 4px);top:-4px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:10px;padding:4px;min-width:180px;box-shadow:0 8px 24px #0000002e}.export-popover-submenu:hover .export-popover-sub{display:block}.deck-detail-panel{position:fixed;top:0;right:0;width:48%;max-width:650px;height:100vh;height:100dvh;background:var(--bg-primary);border-left:1px solid var(--border-color);box-shadow:-4px 0 24px #0000001f;transform:translate(calc(100% + 30px));transition:transform .28s cubic-bezier(.4,0,.2,1),visibility .28s;z-index:100;overflow:hidden;padding:0;padding-bottom:env(safe-area-inset-bottom,0px);visibility:hidden;display:flex;flex-direction:column}.deck-detail-panel-scroll{flex:1;overflow-y:auto;padding:24px 28px}.deck-detail-panel.open{transform:translate(0);visibility:visible}.fab-add-card{position:absolute;bottom:calc(24px + env(safe-area-inset-bottom,0px));right:28px;z-index:200;height:48px;min-width:48px;width:48px;border-radius:24px;background:#e89316;color:#fff;font-size:15px;font-weight:600;border:none;cursor:pointer;box-shadow:0 4px 12px #0003;display:flex;align-items:center;justify-content:center;transition:width .25s ease,border-radius .25s 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rgba(128,128,128,.1));color:var(--text-primary)}.email-action-delete:hover{color:#ef4444}.email-detail-content{padding:28px 32px;max-width:720px}.email-detail-subject{font-size:20px;font-weight:600;color:var(--text-primary);margin:0 0 20px;line-height:1.3}.email-detail-meta{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid 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var(--border-color);padding-top:20px}.email-thread-label{font-size:12px;color:var(--text-tertiary);font-weight:500;text-transform:uppercase;letter-spacing:.4px;margin-bottom:16px}.email-thread-item{padding:16px;border-radius:10px;margin-bottom:12px;border:1px solid var(--border-color)}.email-thread-item.outbound{background:var(--bg-secondary)}.email-thread-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}.email-thread-sender{font-size:13px;font-weight:600;color:var(--text-primary)}.email-thread-date{font-size:11px;color:var(--text-tertiary)}.email-thread-body{font-size:13px;line-height:1.6;color:var(--text-secondary)}.email-reply-btn{display:inline-flex;align-items:center;gap:6px;margin-top:24px;padding:10px 20px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);font-size:13px;font-weight:500;cursor:pointer;transition:all .12s}.email-reply-btn:hover{background:var(--bg-tertiary, rgba(128,128,128,.12))}.email-compose{border:1px solid var(--border-color);border-radius:12px;overflow:hidden;background:var(--bg-primary)}.email-compose-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border-color);background:var(--bg-secondary)}.email-compose-title{font-size:16px;font-weight:600;color:var(--text-primary);margin:0}.email-compose-close{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:4px}.email-compose-form{padding:20px 24px}.email-compose-field{display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--border-color);padding:8px 0}.email-compose-field label{font-size:13px;color:var(--text-tertiary);min-width:50px;font-weight:500}.email-compose-field input{flex:1;border:none;outline:none;background:transparent;font-size:14px;color:var(--text-primary);padding:4px 0}.email-compose-field 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.15s}.email-send-btn:hover{background:#e6951a}.email-send-btn:disabled{opacity:.6;cursor:not-allowed}.email-discard-btn{background:none;border:none;color:var(--text-secondary);font-size:13px;cursor:pointer;padding:8px 12px}.email-discard-btn:hover{color:var(--text-primary)}@media(max-width:768px){.email-client{flex-direction:column}.email-sidebar{width:100%;min-width:unset;border-right:none;border-bottom:1px solid var(--border-color);flex-direction:row;flex-wrap:wrap;padding:10px;gap:6px}.email-compose-btn{padding:8px 14px;font-size:13px}.email-filters{flex-direction:row;gap:2px;margin-top:0}.email-filter-btn{padding:6px 10px;font-size:12px}.email-detail-content{padding:20px 16px}.email-compose-form{padding:16px}.admin-email-toggle-btn{padding:6px 12px;font-size:12px}}@media(max-width:768px){.admin-page{padding:20px 16px}.admin-stats-grid{grid-template-columns:repeat(2,1fr)}.admin-header{margin-bottom:20px}.admin-title{font-size:18px}.admin-users-header{flex-direction:column;align-items:flex-start}.admin-search-wrapper{min-width:unset;width:100%}}@media(max-width:480px){.admin-stats-grid{grid-template-columns:1fr}}.credits-page{padding:32px 40px;max-width:900px;width:100%}.credits-loading{color:var(--text-secondary);font-size:14px;padding:40px 0;text-align:center}.credits-header{margin-bottom:4px}.credits-title{font-size:22px;font-weight:600;color:var(--text-primary);margin:0}.credits-subtabs{display:flex;gap:0;border-bottom:1px solid var(--border-color);margin-bottom:32px}.credits-subtab{background:none;border:none;color:var(--text-secondary);font-size:13px;font-weight:500;padding:12px 16px;cursor:pointer;border-bottom:2px solid transparent;transition:all .15s}.credits-subtab:hover{color:var(--text-primary)}.credits-subtab.active{color:var(--text-primary);border-bottom-color:var(--text-primary)}.credits-balance-section{margin-bottom:36px}.credits-balance-label{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.credits-balance-sublabel{font-size:13px;color:var(--text-secondary);margin-bottom:6px;display:flex;align-items:center}.credits-balance-amount{font-size:40px;font-weight:700;color:var(--text-primary);letter-spacing:-1px;margin-bottom:16px}.credits-admin-grant{margin-top:16px;padding:16px;background:var(--bg-secondary);border-radius:12px;border:1px solid var(--border-color)}.credits-grant-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.credits-grant-input{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;padding:8px 12px;color:var(--text-primary);font-size:13px;outline:none;transition:border-color .15s}.credits-grant-input:focus{border-color:var(--accent-color, #10a37f)}.credits-grant-input:first-child{flex:1;min-width:180px}.credits-grant-amount{width:100px;flex:unset}.credits-grant-btn{background:#10a37f;color:#fff;border:none;border-radius:8px;padding:8px 16px;font-size:13px;font-weight:500;cursor:pointer;transition:opacity .15s;white-space:nowrap}.credits-grant-btn:hover{opacity:.9}.credits-grant-btn:disabled{opacity:.5;cursor:default}.credits-grant-preview{font-size:12px;color:var(--text-secondary);margin-top:6px}.credits-grant-msg{font-size:12px;margin-top:8px;padding:6px 10px;border-radius:6px}.credits-grant-msg.success{color:#10a37f;background:#10a37f1a}.credits-grant-msg.error{color:#ef4444;background:#ef44441a}.credits-checkout-msg{display:flex;align-items:center;padding:12px 16px;border-radius:10px;font-size:14px;font-weight:500;margin-bottom:20px}.credits-checkout-msg.success{background:#22c55e1a;color:#22c55e;border:1px solid rgba(34,197,94,.2)}.credits-checkout-msg.error{background:#ef44441a;color:#ef4444;border:1px solid rgba(239,68,68,.2)}.credits-buy-section{margin-bottom:24px}.credits-buy-header{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.credits-buy-subtitle{font-size:13px;color:var(--text-secondary);margin-bottom:16px}.credits-packages{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.credits-package-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:14px;cursor:pointer;transition:all .2s;position:relative}.credits-package-card:hover{border-color:#6366f1;background:#6366f10d;transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.credits-package-card:disabled{opacity:.6;cursor:not-allowed;transform:none}.credits-package-card.purchasing{border-color:#6366f1}.credits-package-credits{font-size:28px;font-weight:700;color:var(--text-primary);line-height:1}.credits-package-label{font-size:12px;color:var(--text-secondary);margin-top:4px;text-transform:uppercase;letter-spacing:.5px}.credits-package-price{font-size:15px;font-weight:600;color:#6366f1;margin-top:12px}.credits-package-spinner{width:18px;height:18px;border:2px solid var(--border-color);border-top-color:#6366f1;border-radius:50%;animation:credits-spin .6s linear infinite;position:absolute;top:8px;right:8px}@keyframes credits-spin{to{transform:rotate(360deg)}}.credits-quicklinks{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.credits-quicklink{display:flex;align-items:center;gap:14px;padding:18px 16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;cursor:pointer;transition:all .15s;text-align:left}.credits-quicklink:hover{border-color:var(--text-tertiary);background:var(--bg-hover, var(--bg-secondary))}.credits-quicklink-icon{width:40px;height:40px;border-radius:10px;background:var(--bg-primary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);flex-shrink:0}.credits-quicklink-title{font-size:14px;font-weight:600;color:var(--text-primary)}.credits-quicklink-desc{font-size:12px;color:var(--text-secondary);margin-top:2px}.credits-history{min-height:200px}.credits-empty{display:flex;flex-direction:column;align-items:center;gap:12px;padding:60px 0;color:var(--text-secondary);font-size:14px}.credits-table-wrapper{overflow-x:auto;border:1px solid var(--border-color);border-radius:12px}.credits-table{width:100%;border-collapse:collapse;font-size:13px}.credits-table thead{background:var(--bg-secondary)}.credits-table th{text-align:left;padding:10px 14px;font-weight:600;color:var(--text-secondary);font-size:11px;text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border-color)}.credits-table td{padding:12px 14px;color:var(--text-primary);border-bottom:1px solid var(--border-color);vertical-align:top}.credits-table tbody tr:last-child td{border-bottom:none}.credits-table tbody tr:hover{background:var(--bg-secondary)}.credits-num{text-align:right!important;font-variant-numeric:tabular-nums}.credits-date-cell{white-space:nowrap}.credits-time{font-size:11px;color:var(--text-secondary)}.credits-model{font-size:12px;color:var(--text-secondary);font-family:monospace}.credits-token-breakdown{display:flex;flex-direction:column;gap:1px;font-size:11px;color:var(--text-secondary)}.credits-debit{color:#ef4444}.credits-credit{color:#10a37f}.credits-pricing{padding-bottom:40px}.credits-pricing-header h2{font-size:18px;font-weight:600;color:var(--text-primary);margin:0 0 6px}.credits-pricing-note{font-size:13px;color:var(--text-secondary);margin:0 0 24px}.credits-pricing-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:16px;margin-bottom:36px}.credits-pricing-card{border:1px solid var(--border-color);border-radius:14px;padding:20px;background:var(--bg-secondary)}.credits-pricing-card.premium{border-color:#a855f74d}.credits-pricing-card.standard{border-color:#10a37f4d}.credits-pricing-model{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:2px}.credits-pricing-id{font-size:11px;color:var(--text-secondary);font-family:monospace;margin-bottom:16px}.credits-pricing-rates{display:flex;flex-direction:column;gap:0}.credits-pricing-rate-row{display:flex;align-items:center;padding:8px 0;border-bottom:1px solid var(--border-color);font-size:13px}.credits-pricing-rate-row:last-child{border-bottom:none}.credits-rate-label{width:90px;color:var(--text-secondary);font-weight:500}.credits-rate-value{flex:1;color:var(--text-primary)}.credits-rate-credits{color:var(--text-secondary);font-size:12px;text-align:right}.credits-pricing-faq{margin-top:8px}.credits-pricing-faq h3{font-size:16px;font-weight:600;color:var(--text-primary);margin:0 0 16px}.credits-faq-item{margin-bottom:16px;padding:16px;background:var(--bg-secondary);border-radius:10px;border:1px solid var(--border-color)}.credits-faq-q{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:6px}.credits-faq-a{font-size:13px;color:var(--text-secondary);line-height:1.5}@media(max-width:768px){.credits-page{padding:20px 16px}.credits-balance-amount{font-size:32px}.credits-packages{grid-template-columns:repeat(2,1fr)}.credits-quicklinks,.credits-pricing-cards{grid-template-columns:1fr}.credits-grant-row{flex-direction:column}.credits-grant-input:first-child{min-width:unset;width:100%}.credits-grant-amount,.credits-grant-btn{width:100%}}.share-email-wrapper{position:relative;flex:1}.share-suggestions{position:absolute;top:100%;left:0;right:0;z-index:10;margin-top:4px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 16px #00000026;max-height:200px;overflow-y:auto;list-style:none;padding:4px}.share-suggestion-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:6px;cursor:pointer;transition:background .1s}.share-suggestion-item:hover,.share-suggestion-item.active{background:var(--bg-tertiary)}.share-suggestion-avatar{width:28px;height:28px;border-radius:14px;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:var(--text-secondary);flex-shrink:0}.share-suggestion-info{min-width:0;flex:1}.share-suggestion-name{font-size:13px;font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.share-suggestion-email{font-size:12px;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}