.history-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.history-modal{background:#fff;border-radius:16px;width:100%;max-width:360px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 10px 40px #0003}.history-modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid #E5E7EB}.history-modal-header h2{margin:0;font-size:1.1rem;font-weight:600;color:#1f2937}.history-close-btn{background:none;border:none;font-size:1.2rem;color:#6b7280;cursor:pointer;padding:4px 8px;border-radius:4px;transition:background .2s}.history-close-btn:hover{background:#f3f4f6}.history-modal-content{flex:1;overflow-y:auto;padding:12px}.history-empty{text-align:center;color:#9ca3af;padding:40px 20px;font-size:.95rem}.history-entry{background:#f9fafb;border:1px solid #E5E7EB;border-radius:12px;padding:16px;margin-bottom:12px;font-family:SF Mono,Monaco,Consolas,monospace}.history-entry:last-child{margin-bottom:0}.history-entry.clickable{cursor:pointer;transition:all .2s ease;-webkit-user-select:none;user-select:none}.history-entry.clickable:hover{background:#ebf8ff;border-color:#0f766e;transform:translateY(-2px);box-shadow:0 4px 12px #0f766e26}.history-entry.clickable:active{transform:translateY(0);background:#dbeafe}.history-expression{text-align:right;padding-right:20px}.history-line{font-size:1.1rem;color:#374151;line-height:1.5}.history-divider{text-align:right;padding-right:20px;color:#9ca3af;letter-spacing:-1px;margin:4px 0}.history-result{text-align:right;padding-right:20px;display:flex;align-items:baseline;justify-content:flex-end;gap:8px}.history-result-main{font-size:1.2rem;font-weight:600;color:#1f2937}.history-result-alt{font-size:.85rem;color:#6b7280}*{box-sizing:border-box}.app{height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden;background:#f6f8fb}.header{flex-shrink:0;background:#fff;border-bottom:1px solid #D9E1EA;padding:8px 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rgba(75,85,99,.5);border-radius:8px;color:#e5e7eb;font-size:.8rem;text-decoration:none}.main{flex:1;display:flex;flex-direction:column;padding:8px;gap:8px;overflow:hidden;max-height:calc(100vh - 50px);max-height:calc(100dvh - 50px)}.card{background:#fff;border:1px solid #D9E1EA;border-radius:12px;padding:12px;box-shadow:0 1px 3px #0000000d}.left-card{flex-shrink:0}.right-card{flex:1;display:flex;flex-direction:column;min-height:0}.display-section{margin-bottom:8px}.display-row{display:flex;gap:8px;align-items:stretch}.display-box{background:#eef2f6;border:2px solid #D9E1EA;border-radius:8px;padding:12px 16px;display:flex;align-items:center;justify-content:center}.display-box.primary{flex:1;min-width:0}.display-box.secondary{flex:0 0 auto;min-width:90px}.display-box.equal{flex:1;min-width:0}.display-value{font-weight:600;color:#0e1a2a;white-space:nowrap;overflow:hidden;width:100%;display:block;text-align:center}.display-value.recording{color:#0f3d3a;animation:pulse 1.5s infinite}.display-value.processing{color:#5c6b7a;animation:pulse 1s infinite}.display-value-secondary{font-size:1.4rem;font-weight:500;color:#5c6b7a;white-space:nowrap}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.divider{height:1px;background:#d9e1ea;margin:8px 0}.expression-wrapper{position:relative;margin-bottom:8px}.expression-input{width:100%;background:#fff;border:2px solid #D9E1EA;color:#0e1a2a;border-radius:12px;padding:16px 50px 16px 16px;font-family:inherit;min-height:60px;display:flex;align-items:center;box-sizing:border-box}.expression-text{display:block;width:100%;overflow:hidden;white-space:nowrap;font-weight:500}.expression-text.placeholder{color:#9aa7b5}.history-btn{position:absolute;right:8px;top:50%;transform:translateY(-50%);width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#fbbf24,#f59e0b);border:none;color:#0b1120;font-weight:700;font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .15s ease,box-shadow .15s ease}.history-btn:hover{transform:translateY(-50%) scale(1.05);box-shadow:0 2px 8px #fbbf2466}.history-btn:active{transform:translateY(-50%) scale(.95)}.voice-btn{width:100%;min-height:48px;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;background:#fdb91314;border:2px solid rgba(253,185,19,.25);border-radius:9999px;color:#0e1a2a;font-size:.9rem;font-weight:600;cursor:pointer;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:none;transition:background .15s ease-out,border-color .15s ease-out,color .15s ease-out}.voice-btn:disabled{opacity:.5;cursor:not-allowed}.voice-btn.listening{background:#fdb913;border-color:#e5a811;color:#0e1a2a;box-shadow:0 0 0 4px #fdb9134d}.voice-btn.processing{background:#0f3d3a;border-color:#0f3d3a;color:#fff;animation:pulse-thinking 1.2s ease-in-out infinite}@keyframes pulse-thinking{0%,to{opacity:1}50%{opacity:.7}}.voice-btn.locked{background:#64646414;border-color:#64646440;color:#5c6b7a}.voice-icon{font-size:1.2rem;display:flex;align-items:center;justify-content:center}.voice-btn.listening .voice-icon{color:#0e1a2a}.voice-text{color:inherit}.voice-feedback{text-align:center;font-size:.85rem;font-weight:500;margin-bottom:8px;min-height:24px;color:#5c6b7a}.voice-feedback.recording{color:#fdb913;font-weight:600;animation:fade-in-out 1s ease-in-out infinite}.voice-feedback.processing{color:#0f3d3a;font-weight:600}@keyframes fade-in-out{0%,to{opacity:1}50%{opacity:.5}}.memory{margin-top:8px;padding-top:8px;border-top:1px solid #D9E1EA;font-family:monospace;color:#5c6b7a;font-size:.85rem;line-height:1.3}.memory-line{color:#9aa7b5;margin:2px 0}.fraction-label{color:#9ca3af;font-size:.6rem;letter-spacing:.15em;text-align:center;margin-bottom:6px}.fraction-container{background:#eef2f6;border-radius:8px;padding:8px;margin-bottom:12px;border:1px solid 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.15s}.key:active{transform:scale(.96)}.key.operator{background:#e6ecf2;border-color:#d9e1ea;color:#0e1a2a;font-weight:600}.key.danger{background:#ffe5e5;border-color:#fcc;color:#c33;font-weight:600}.key.equals{background:#0f3d3a;border-color:#0f3d3a;color:#fff;font-weight:700}@media (min-width: 768px){.app{background:linear-gradient(135deg,#0f172a,#1e293b)}.header{padding:12px 24px;padding-top:max(12px,env(safe-area-inset-top))}.main{flex-direction:row;justify-content:center;align-items:flex-start;max-width:1000px;margin:0 auto;padding:32px 24px;gap:24px;height:auto;max-height:none;overflow:visible}.left-card{flex:0 0 380px;min-height:400px}.right-card{flex:0 0 320px;min-height:480px}.card{padding:24px;border-radius:16px;box-shadow:0 4px 24px #0000004d}.display-section{margin-bottom:16px}.display-row{gap:12px}.display-box{padding:16px 20px;border-radius:10px}.display-box.secondary{min-width:120px}.display-value-secondary{font-size:1.6rem}.divider{margin:16px 0}.expression-input{padding:16px 18px;font-size:1.15rem;margin-bottom:16px;border-radius:12px}.voice-btn{padding:16px 28px;font-size:1.1rem;margin-top:8px}.voice-icon{font-size:1.4rem}.memory{margin-top:16px;padding-top:12px;font-size:1rem}.fraction-label{font-size:.7rem;margin-bottom:12px}.fraction-pad{gap:10px;margin-bottom:16px}.frac-btn{padding:14px 8px;font-size:1rem;border-radius:10px}.frac-btn:hover{background:#e6ecf2;border-color:#d9e1ea;transform:translateY(-1px)}.frac-btn.feet:hover{background:#e6ecf2;border-color:#d9e1ea}.keypad,.keypad-row{gap:10px}.key{padding:20px 0;font-size:1.5rem;border-radius:12px;transition:all .15s}.key:hover{background:#e6ecf2;border-color:#d9e1ea;transform:translateY(-1px)}.key.danger:hover,.key.operator:hover{background:#e6ecf2;border-color:#d9e1ea}.key.equals:hover{background:#0b2f2c;border-color:#0b2f2c}}@media (max-height: 700px){.header{padding:6px 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#0000001a;width:100%;max-width:420px;padding:32px}.auth-logo{display:flex;justify-content:center;margin-bottom:16px}.auth-logo-icon{width:56px;height:56px;background:linear-gradient(135deg,#fbbf24,#f59e0b);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:28px}.auth-title{text-align:center;font-size:1.5rem;font-weight:700;color:#111827;margin-bottom:24px}.auth-subtitle{text-align:center;color:#6b7280;margin-bottom:16px}.auth-subtitle-lg{text-align:center;font-size:1.125rem;font-weight:600;color:#111827;margin-bottom:4px}.auth-form{display:flex;flex-direction:column;gap:16px}.auth-input{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:8px;font-size:1rem;color:#111827;background:#fff;transition:border-color .2s,box-shadow .2s}.auth-input:focus{outline:none;border-color:#fbbf24;box-shadow:0 0 0 3px #fbbf2426}.auth-input::placeholder{color:#9ca3af}.auth-select{width:100%;padding:12px 16px;border:1px solid #d1d5db;border-radius:8px;font-size:1rem;color:#111827;background:#fff;cursor:pointer}.auth-select:focus{outline:none;border-color:#fbbf24;box-shadow:0 0 0 3px #fbbf2426}.auth-btn{width:100%;padding:14px 24px;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .2s,opacity .2s;display:flex;align-items:center;justify-content:center;gap:8px}.auth-btn:disabled{opacity:.5;cursor:not-allowed}.auth-btn-primary{background:#fbbf24;color:#fff}.auth-btn-primary:hover:not(:disabled){background:#f59e0b}.auth-btn-success{background:#16a34a;color:#fff}.auth-btn-success:hover:not(:disabled){background:#15803d}.auth-link{background:none;border:none;color:#fbbf24;font-size:.875rem;cursor:pointer;text-decoration:none}.auth-link:hover{text-decoration:underline}.auth-forgot{width:100%;text-align:center;padding:8px}.auth-email-info{text-align:center;margin-bottom:8px}.auth-email-display{font-weight:600;color:#111827;margin:4px 0}.auth-password-wrapper{position:relative}.auth-password-toggle{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;font-size:1.2rem;opacity:.6}.auth-password-toggle:hover{opacity:1}.auth-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:12px 16px;border-radius:8px;font-size:.875rem}.auth-success{background:#f0fdf4;border:1px solid #bbf7d0;color:#16a34a;padding:12px 16px;border-radius:8px;font-size:.875rem}.auth-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.auth-row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.auth-field{display:flex;flex-direction:column;gap:6px}.auth-label{font-size:.875rem;color:#6b7280}.auth-radio-group{display:flex;gap:16px}.auth-radio-label{display:flex;align-items:center;gap:6px;cursor:pointer;color:#374151}.auth-radio{width:16px;height:16px;accent-color:#fbbf24}.auth-terms{font-size:.75rem;color:#6b7280;text-align:center}.auth-terms a{color:#fbbf24}.auth-trial-info{text-align:center;font-size:.875rem;color:#6b7280}.auth-spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.popup-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.popup-content{background:#fff;border-radius:16px;width:100%;max-width:380px;padding:32px 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p{font-size:1rem;color:#9ca3af}.consent-modal{max-width:400px}.consent-details{text-align:left;margin-bottom:24px;padding:16px;background:#f9fafb;border-radius:12px}.consent-text{color:#4b5563;font-size:.9rem;line-height:1.5;margin-bottom:12px}.consent-text:last-child{margin-bottom:0}.consent-privacy{display:flex;align-items:flex-start;gap:8px;color:#059669;font-weight:500}.consent-list{margin:8px 0 16px;padding-left:20px;color:#4b5563;font-size:.9rem;line-height:1.6}.consent-list li{margin-bottom:4px}.consent-checkbox-label{display:flex;align-items:flex-start;gap:10px;margin-top:16px;padding-top:16px;border-top:1px solid #e5e7eb;cursor:pointer}.consent-checkbox-label input[type=checkbox]{margin-top:3px;width:18px;height:18px;accent-color:#0F3D3A;cursor:pointer;flex-shrink:0}.consent-checkbox-text{color:#6b7280;font-size:.85rem;line-height:1.4}.popup-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:12px 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