.app-container{height:100vh;overflow:hidden;display:flex;flex-direction:column}.app-grid{display:grid;grid-template-columns:600px 1fr;background:var(--bg-secondary);flex:1;min-height:0}.app-bar{background:var(--glass-bg);backdrop-filter:blur(20px);border-bottom:1px solid var(--glass-border);padding:1rem 1.5rem;display:grid;grid-template-columns:1fr 2fr 1fr;align-items:center;position:relative;z-index:100;min-height:64px}.app-bar__left-section{display:flex;align-items:center;gap:3rem}.app-bar__logo{font-size:1.125rem;font-weight:600;letter-spacing:-.02em;color:var(--text-primary);position:relative}.app-bar__logo:after{content:"";position:absolute;bottom:-2px;left:0;width:100%;height:1px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:.8}.app-bar__center-section{display:flex;justify-content:center;align-items:center;gap:1.5rem}.app-bar__center-section button{padding:0 2px;width:38px;height:30px;display:flex;align-items:center;justify-content:center}.app-bar__challenge-info{text-align:center;min-width:200px;flex:1}.app-bar__challenge-title{font-size:1rem;font-weight:600;color:var(--text-primary);margin:0 0 .25rem;line-height:1.2}.app-bar__challenge-description{font-size:.75rem;color:var(--text-secondary);margin:0;line-height:1.3;opacity:.8}.app-bar__right-section{display:flex;align-items:center;gap:1rem;justify-self:end}.app-bar__xp-container{display:flex;align-items:center;gap:.75rem;background:var(--glass-bg);border:1px solid var(--glass-border);padding:.5rem 1rem;border-radius:8px;transition:all .2s ease}.app-bar__xp-icon{width:16px;height:16px}.app-bar__xp-value{font-weight:600;color:var(--primary);font-size:.875rem}.app-bar__xp-label{color:var(--text-muted);font-size:.75rem}.compare__overlay{position:fixed;inset:0;background:#000c;z-index:10}.compare__overlay--hidden{display:none}.compare__modal{position:fixed;left:0;right:0;top:6rem;z-index:20;margin:0 auto;min-width:300px;max-width:fit-content;border-radius:8px;border:1px solid var(--border-secondary);background:var(--bg-primary);padding:1.5rem;box-shadow:0 10px 25px #00000040}.compare__modal--hidden{display:none}.compare__loading{position:relative;height:2.5rem;width:100%}.compare__loading-bar{height:2.5rem;border-radius:9999px;background:var(--primary)}.compare__loading-text{position:absolute;left:0;right:0;top:.5rem;margin:0 auto;width:fit-content;color:var(--text-primary);font-weight:500}.compare__results{margin:1rem auto 0;display:flex;width:fit-content;flex-direction:column;align-items:center;justify-content:center}.compare__title{margin-bottom:1.5rem;width:100%;text-align:center;font-size:1.875rem;font-weight:700;color:var(--text-primary)}.compare__opacity-controls{margin-bottom:.5rem;display:flex;width:100%;align-items:center;justify-content:space-between;gap:.5rem;color:var(--text-secondary)}.compare__opacity-slider{flex:1;margin:0 1rem}.compare__image-container{position:relative}.compare__image-layer{position:absolute;inset:0;margin:0 auto;width:fit-content}.compare__image-layer img{display:block}.compare__xp-display{margin-top:.5rem;text-align:center;font-size:1.5rem;font-weight:700;color:var(--success)}.compare__close-button{margin-top:.5rem;padding:.5rem 1rem;border:0;border-radius:6px;font-weight:600;font-size:.875rem;cursor:pointer;background:linear-gradient(135deg,var(--danger),#b91c1c);color:#fff;transition:all .2s ease;box-shadow:0 2px 4px #0000001a;width:fit-content}.compare__close-button:hover{transform:translateY(-1px);box-shadow:0 4px 8px #00000026}.compare__run-button{padding:.75rem 1.5rem;border:0;border-radius:8px;font-weight:600;font-size:.875rem;color:#fff;transition:all .2s ease;box-shadow:0 2px 4px #0000001a;backdrop-filter:blur(10px);display:block}.compare__run-button--enabled{cursor:pointer;background:linear-gradient(135deg,var(--primary),#1d4ed8)}.compare__run-button--enabled:hover{transform:translateY(-1px);box-shadow:0 4px 8px #00000026}.compare__run-button--disabled{cursor:not-allowed;background:var(--text-muted)}.control-bar{background:var(--bg-secondary);padding:1rem;display:flex;gap:1.5rem;justify-content:center;align-items:center}.control-bar__dark-mode-toggle{display:flex;align-items:center;gap:.75rem}.control-bar__dark-mode-label{font-size:.8125rem;color:var(--text-secondary);font-weight:500}.control-bar__toggle-switch{position:relative;width:44px;height:24px;border-radius:12px;cursor:pointer;transition:all .25s ease;border:1px solid var(--border-secondary)}.control-bar__toggle-switch--dark{background:var(--primary);border-color:var(--primary)}.control-bar__toggle-knob{position:absolute;top:1px;left:1px;width:20px;height:20px;background:var(--text-primary);border-radius:50%;transition:all .25s cubic-bezier(.4,0,.2,1);box-shadow:0 1px 3px #0000004d}.control-bar__toggle-knob--dark{transform:translate(20px)}.design-display{display:flex;flex-direction:column;align-items:center}.design-display__iframe{border:0}.design-panel{display:flex;gap:1px;height:100%;max-height:100%}.design-panel__preview-pane{flex:1;height:100%;max-height:100%;position:relative;display:flex;align-items:center;justify-content:center;transition:all .3s ease}.design-panel__preview-pane:last-child iframe{border-left:1px solid var(--border-secondary)}.design-panel__preview-label{position:absolute;top:1rem;left:1rem;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;padding:.25rem .75rem;border-radius:4px;z-index:10;color:#fff}.design-panel__preview-label--target{background:var(--success)}.design-panel__preview-label--current{background:var(--danger)}.editor{height:calc(100% - 2.5rem);width:100%;background-color:#282c34;overflow-y:auto}.editors{height:100%;width:100%;position:relative}.editors__section{position:absolute;width:100%;height:50%;box-sizing:border-box}.editors__section:first-child{top:0}.editors__section:last-child{top:50%}.editors__title{padding:.5rem 1rem;font-size:1rem;color:var(--text-primary);margin:0;background-color:var(--secondary);height:2.5rem;line-height:1.5rem;box-sizing:border-box}