.date-time-calculator-container{--bg-primary:#f5f5f0;--bg-secondary:#fff;--bg-section:#fff;--border-color:#333;--text-primary:#222;--text-secondary:#555;--text-light:#666;--color-accent:#3498db;--color-success:#27ae60;--color-warning:#f39c12;--color-danger:#e74c3c;--color-purple:#9b59b6;--color-teal:#1abc9c;--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;--title-color:#2c3e50;--title-shadow:2px 2px 0 rgba(255,255,255,0.5);--btn-hover-overlay:rgba(0,0,0,0.1);--copy-btn-bg:#fff;--copy-btn-hover-bg:#f0f0f0}.date-time-calculator-container.dark{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--color-teal:#48d1cc;--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;--title-color:#7fb3d5;--title-shadow:2px 2px 0 rgba(0,0,0,0.5);--btn-hover-overlay:rgba(255,255,255,0.1);--copy-btn-bg:#3a3a3a;--copy-btn-hover-bg:#4a4a4a}@media (prefers-color-scheme:dark){.date-time-calculator-container:not(.dark):not(.light){--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--color-teal:#48d1cc;--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;--title-color:#7fb3d5;--title-shadow:2px 2px 0 rgba(0,0,0,0.5);--btn-hover-overlay:rgba(255,255,255,0.1);--copy-btn-bg:#3a3a3a;--copy-btn-hover-bg:#4a4a4a}}.date-time-calculator-container,.date-time-calculator-container *,.date-time-calculator-container *::before,.date-time-calculator-container *::after{box-sizing:border-box}.date-time-calculator-container{position:relative;max-width:900px;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}.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:2px 2px 0 rgba(0,0,0,.15);font-size:17.5px;font-weight:600;color:var(--text-primary);z-index:10}.dark-mode-toggle:hover{transform:translate(.5px,.5px);box-shadow:1.5px 1.5px 0 rgba(0,0,0,.15)}.dark-mode-toggle:active{transform:translate(2px,2px);box-shadow:none}.header{margin-bottom:16px;padding:0 4px}.main-title{margin:0 0 4px 0;font-size:28px;font-weight:800;color:var(--title-color);text-shadow:var(--title-shadow);letter-spacing:-.5px}.subtitle{margin:0;font-size:17px;color:var(--text-secondary)}.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);display:flex;flex-direction:column}.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:500;color:var(--text-primary)}.flex-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}.now-btn{padding:2px 8px;font-size:14px;background:var(--bg-secondary);color:var(--color-teal);border:1px solid var(--border-color);border-radius:4px;cursor:pointer;transition:all 0.2s}.now-btn:hover{background:var(--color-teal);color:#fff}.date-time-wrapper{display:flex;gap:6px}.date-input,.time-input{flex:1}.input-group input,.input-group select{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)}.input-group input:focus,.input-group select:focus{outline:none;border-color:var(--color-accent);background:var(--input-focus-bg);box-shadow:0 0 0 2px rgba(52,152,219,.1)}.radio-group{display:flex;gap:12px;padding:6px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-input)}.radio-label{display:flex;align-items:center;gap:6px;cursor:pointer;font-size:16px;color:var(--text-primary)}.radio-label input[type="radio"]{width:16px;height:16px;margin:0;cursor:pointer;box-shadow:none}.duration-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px}.duration-item{position:relative}.duration-item input{padding-right:36px;text-align:right;font-family:'Courier New',monospace;font-weight:700}.duration-item .unit{position:absolute;right:8px;top:50%;transform:translateY(-50%);font-size:14px;color:var(--text-light);pointer-events:none}.input-description{margin-top:4px;font-size:14.5px;color:var(--text-light)}.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-content{flex-grow:1}.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)}.result-row{display:flex;justify-content:space-between;align-items:center}.result-label{display:block;margin-bottom:4px;font-size:15.5px;font-weight:500;color:var(--text-secondary)}.result-value{display:block;font-size:22px;font-weight:700;color:var(--text-primary);font-family:'Courier New',monospace;letter-spacing:.5px}.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;cursor:pointer;transition:all 0.2s;box-shadow:1px 1px 0 rgba(0,0,0,.15);color:var(--text-primary)}.copy-btn:hover{background:var(--copy-btn-hover-bg);transform:translate(.5px,.5px)}.copy-btn:active{transform:translate(1px,1px);box-shadow:none}.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);transform:translate(.5px,.5px);box-shadow:1.5px 1.5px 0 rgba(0,0,0,.2)}.save-image-btn:active{transform:translate(2px,2px);box-shadow:none}.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;display:block}.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}.toast.info{background:var(--color-accent);color:#fff}@media (max-width:768px){.date-time-calculator-container{margin:6px 5px;padding:7px;width:calc(100% - 10px)}.main-grid{grid-template-columns:1fr;gap:6px}.section-header{font-size:16px}.main-title{font-size:24px}.date-time-wrapper{flex-direction:column}}@media (max-width:480px){.date-time-calculator-container{margin:5px 3px;padding:6px;border-width:1px}.input-section,.result-section{padding:6px}.calculate-btn{font-size:16.5px}}