.time-duration-calculator-container{color-scheme:light;--bg-primary:#f5f5f0;--bg-secondary:#fff;--bg-section:#fff;--border-color:#333;--text-primary:#222;--text-secondary:#555;--text-light:#666;--text-placeholder:#999;--color-accent:#3498db;--color-success:#27ae60;--color-warning:#f39c12;--color-danger:#e74c3c;--color-purple:#9b59b6;--shadow-sm:2px 2px 0 rgba(0,0,0,0.1);--shadow-md:4px 4px 0 rgba(0,0,0,0.15);--shadow-lg:8px 8px 0 rgba(0,0,0,0.15);--radius-container:8px;--radius-section:6px;--radius-button:4px;--radius-input:4px;--input-focus-bg:#fffacd;--copy-btn-bg:#fff;--copy-btn-hover-bg:#f0f0f0}.time-duration-calculator-container.dark{color-scheme:dark;--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--text-placeholder:#666;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--shadow-sm:2px 2px 0 rgba(255,255,255,0.08);--shadow-md:4px 4px 0 rgba(255,255,255,0.12);--shadow-lg:8px 8px 0 rgba(255,255,255,0.12);--input-focus-bg:#3a3a3a;--copy-btn-bg:#3a3a3a;--copy-btn-hover-bg:#4a4a4a}@media (prefers-color-scheme:dark){.time-duration-calculator-container:not(.dark):not(.light){color-scheme:dark;--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--text-placeholder:#666;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--shadow-sm:2px 2px 0 rgba(255,255,255,0.08);--shadow-md:4px 4px 0 rgba(255,255,255,0.12);--shadow-lg:8px 8px 0 rgba(255,255,255,0.12);--input-focus-bg:#3a3a3a;--copy-btn-bg:#3a3a3a;--copy-btn-hover-bg:#4a4a4a}}.time-duration-calculator-container,.time-duration-calculator-container *{box-sizing:border-box}.time-duration-calculator-container{position:relative;max-width:800px;width:100%;margin:8px auto;padding:8px;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:var(--radius-container);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;color:var(--text-primary);box-shadow:var(--shadow-lg);line-height:1.5;transition:background 0.3s,color 0.3s,border-color 0.3s}.dark-mode-toggle{position:absolute;top:10px;right:10px;padding:6px 10px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;cursor:pointer;transition:all 0.2s;box-shadow:var(--shadow-sm);font-size:17.5px;color:var(--text-primary);z-index:10}.dark-mode-toggle:hover{transform:translate(.5px,.5px);box-shadow:.5px .5px 0 rgba(0,0,0,.15)}.header{margin-bottom:8px;padding-right:50px}.main-title{font-size:24px;font-weight:800;margin:0 0 4px 0;color:var(--text-primary);letter-spacing:-.5px}.subtitle{font-size:15px;color:var(--text-secondary);margin:0}.main-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.input-section,.result-section{background:var(--bg-section);padding:8px;border:1px solid var(--border-color);border-radius:var(--radius-section);box-shadow:var(--shadow-md)}.section-header{display:flex;align-items:center;gap:6px;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid var(--border-color);font-size:17px;font-weight:600;color:var(--text-primary)}.section-header svg{stroke:var(--color-accent)}.input-group{margin-bottom:8px}.input-group label{display:block;margin-bottom:4px;font-size:16px;font-weight:600;color:var(--text-primary)}.input-group input[type="time"],.input-group input[type="number"]{width:100%;padding:7px;border:1px solid var(--border-color);border-radius:var(--radius-input);background:var(--bg-secondary);color:var(--text-primary);font-size:18px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;transition:all 0.2s;box-shadow:var(--shadow-sm);-webkit-text-fill-color:var(--text-primary)}.input-group input::placeholder{color:var(--text-placeholder);opacity:1}.input-group input:focus{outline:none;border-color:var(--color-accent);background:var(--input-focus-bg)}input[type="number"]{font-family:'Courier New',monospace;font-weight:700}.input-description{margin-top:4px;font-size:14.5px;color:var(--text-light)}.checkbox-wrapper{display:flex;align-items:center;gap:8px;margin-top:6px}.checkbox-wrapper input[type="checkbox"]{width:18px;height:18px;cursor:pointer;border:1px solid var(--border-color);accent-color:var(--color-accent)}.checkbox-label{font-size:15px!important;margin-bottom:0!important;font-weight:400!important;cursor:pointer;color:var(--text-primary)}.calculate-btn{width:100%;padding:8px 16px;margin-top:8px;background:var(--color-accent);color:#fff;border:1.5px solid var(--border-color);border-radius:var(--radius-button);font-size:18px;font-weight:600;cursor:pointer;transition:all 0.15s;box-shadow:4px 4px 0 rgba(0,0,0,.2)}.calculate-btn:hover{filter:brightness(1.05);transform:translate(1px,1px);box-shadow:3px 3px 0 rgba(0,0,0,.2)}.calculate-btn:active{transform:translate(4px,4px);box-shadow:none}.button-group{display:flex;gap:6px;margin-top:6px}.sample-btn,.reset-btn{flex:1;padding:6px 12px;font-size:16px;font-weight:500;border:1px solid var(--border-color);border-radius:var(--radius-button);cursor:pointer;transition:all 0.15s;box-shadow:2px 2px 0 rgba(0,0,0,.2)}.sample-btn{background:var(--color-success);color:#fff}.reset-btn{background:var(--color-warning);color:#fff}.sample-btn:hover,.reset-btn:hover{transform:translate(.5px,.5px);box-shadow:1.5px 1.5px 0 rgba(0,0,0,.2)}.sample-btn:active,.reset-btn:active{transform:translate(2px,2px);box-shadow:none}.result-item{padding:8px;margin-bottom:6px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-button);box-shadow:var(--shadow-sm)}.highlight-box{background:var(--input-focus-bg);border:1.5px solid var(--color-accent)}.result-label{display:block;margin-bottom:4px;font-size:15.5px;font-weight:500;color:var(--text-secondary)}.value-row{display:flex;justify-content:space-between;align-items:center}.result-value{display:block;font-size:22px;font-weight:700;color:var(--text-primary);font-family:'Courier New',monospace}.result-value.highlight{font-size:26px;color:var(--color-accent)}.copy-btn{padding:4px 8px;background:var(--copy-btn-bg);border:1px solid var(--border-color);border-radius:3px;font-size:14.5px;color:var(--text-primary);cursor:pointer;transition:all 0.2s}.copy-btn:hover{background:var(--copy-btn-hover-bg)}.save-image-btn{width:100%;padding:8px 16px;margin-top:8px;background:var(--color-purple);color:#fff;border:1px solid var(--border-color);border-radius:var(--radius-button);font-size:16px;font-weight:600;cursor:pointer;transition:all 0.15s;box-shadow:2px 2px 0 rgba(0,0,0,.2)}.save-image-btn:hover{filter:brightness(1.05)}.save-image-btn.capturing{display:none}.watermark{position:absolute;bottom:10px;right:10px;font-size:13px;font-weight:500;color:var(--text-light);opacity:.6;pointer-events:none;z-index:5}.toast{position:fixed;bottom:20px;right:20px;padding:10px 16px;background:var(--text-primary);color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-button);font-size:16px;font-weight:500;box-shadow:4px 4px 0 rgba(0,0,0,.3);z-index:1000;opacity:0;visibility:hidden;transition:all 0.3s}.toast.show{opacity:1;visibility:visible;transform:translateY(-5px)}.toast.success{background:var(--color-success);color:#fff}.toast.error{background:var(--color-danger);color:#fff}@media (max-width:768px){.time-duration-calculator-container{margin:6px 5px;padding:7px;width:calc(100% - 10px)}.main-grid{grid-template-columns:1fr;gap:6px}}