.dead-pixel-page{min-height:100vh}.hero-container{padding-top:var(--spacing-5xl);padding-bottom:var(--spacing-3xl);position:relative;z-index:1}.page-header{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm)}.page-title{margin:0;text-align:center}.page-subtitle{margin:0;max-width:600px;text-align:center}.test-section{padding-bottom:var(--spacing-5xl);position:relative}.start-screen{max-width:640px;margin:0 auto;text-align:center;padding:var(--spacing-4xl) var(--spacing-2xl);animation:fade-in-up .5s ease}.start-screen-content{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.start-icon{width:80px;height:80px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-xl);background:var(--theme-canvas-soft-2);border:1px solid var(--theme-hairline);color:var(--theme-ink)}.start-screen h2{margin:0}.start-screen p{max-width:480px;margin:0}.start-btn{font-size:18px;padding:14px 40px;margin-top:var(--spacing-sm);background:var(--color-ink);color:var(--color-on-primary);border:none;border-radius:var(--radius-pill);box-shadow:var(--shadow-level-2);transition:all .2s ease}.start-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-level-4);background:#333;color:var(--color-on-primary)}[data-theme=dark] .start-btn{background:var(--color-canvas);color:var(--color-ink);box-shadow:var(--shadow-level-2)}[data-theme=dark] .start-btn:hover{background:#e5e5e5;color:var(--color-ink);box-shadow:var(--shadow-level-4)}.start-tips{margin-top:var(--spacing-xl);text-align:left;width:100%;max-width:480px;padding:var(--spacing-lg);background:var(--theme-canvas-soft);border-radius:var(--radius-md);border:1px solid var(--theme-hairline)}.start-tips .eyebrow-mono{margin-bottom:var(--spacing-sm);display:block}.start-tips ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:8px}.start-tips li{font-size:14px;line-height:20px;color:var(--theme-body)}.start-tips kbd{display:inline-block;padding:1px 6px;font-family:var(--font-mono);font-size:11px;background:var(--theme-canvas);border:1px solid var(--theme-hairline-strong);border-radius:3px;color:var(--theme-ink)}.test-ui{position:fixed;inset:0;z-index:1000;display:flex;flex-direction:column}.color-display{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;cursor:pointer;transition:background-color .3s ease}.color-info{display:flex;flex-direction:column;align-items:center;gap:8px;animation:fade-in .2s ease;user-select:none}.color-badge{display:inline-flex;align-items:center;gap:10px;font-size:28px;font-weight:600;letter-spacing:-.6px;padding:8px 20px;border-radius:100px;backdrop-filter:blur(8px);transition:all .3s ease}.color-dot{width:16px;height:16px;border-radius:50%;border:2px solid rgba(255,255,255,.5);flex-shrink:0;transition:all .3s ease}.color-hex{font-family:var(--font-mono);font-size:14px;font-weight:400;opacity:.8;letter-spacing:.5px}.color-navigation-hint{position:absolute;bottom:120px;left:50%;transform:translate(-50%);animation:fade-in .5s ease .5s both}.hint-text{font-size:13px;font-weight:400}.hint-text kbd{display:inline-block;padding:1px 6px;font-family:var(--font-mono);font-size:11px;border-radius:3px}.test-controls{padding:var(--spacing-md) var(--spacing-lg);padding-bottom:calc(var(--spacing-md) + env(safe-area-inset-bottom,0px));backdrop-filter:blur(16px);transition:background-color .3s ease;flex-shrink:0}.controls-inner{display:flex;flex-direction:column;gap:var(--spacing-sm);max-width:800px;margin:0 auto;width:100%}.controls-row{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md)}.top-row,.bottom-row{gap:var(--spacing-lg)}.control-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-pill);border:1px solid var(--btn-border);background:transparent;color:var(--btn-color);font-family:var(--font-sans);font-size:13px;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}.control-btn:hover{background:var(--btn-hover-bg);transform:translateY(-1px)}.control-btn:active{transform:translateY(0)}.btn-label{color:inherit;font-size:13px;font-weight:500}.prev-btn .btn-label{order:-1}.color-strip{display:flex;align-items:center;gap:8px;flex:1;max-width:400px;justify-content:center}.color-strip-dot{width:20px;height:20px;border-radius:50%;cursor:pointer;transition:all .2s ease;border:2px solid;flex-shrink:0}.color-strip-dot:hover{transform:scale(1.2)}.quick-jump-group{display:flex;align-items:center;gap:6px}.jump-label{font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.5px;opacity:.7}.jump-btn{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;border:1px solid var(--btn-border);background:transparent;color:var(--btn-color);font-family:var(--font-mono);font-size:12px;font-weight:600;cursor:pointer;transition:all .2s ease}.jump-btn:hover{background:var(--btn-hover-bg);transform:scale(1.1)}.action-group{display:flex;align-items:center;gap:8px}.check-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-pill);border:1px solid var(--btn-border);background:transparent;color:var(--btn-color);font-family:var(--font-sans);font-size:13px;font-weight:500;cursor:pointer;transition:all .2s ease}.check-btn:hover{background:#10b98133;border-color:#10b98166}.exit-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-pill);border:1px solid var(--btn-border);background:transparent;color:var(--btn-color);font-family:var(--font-sans);font-size:13px;font-weight:500;cursor:pointer;transition:all .2s ease}.exit-btn:hover{background:#e003;border-color:#e006}.is-hidden,.hidden{display:none!important}.check-popup{position:fixed;inset:0;z-index:1100;display:flex;align-items:center;justify-content:center}.popup-backdrop{position:absolute;inset:0;background:#0009;backdrop-filter:blur(4px)}.popup-card{position:relative;background:var(--theme-canvas);border-radius:var(--radius-xl);padding:var(--spacing-2xl);max-width:420px;width:90%;text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);box-shadow:var(--shadow-level-5);animation:fade-in-up .25s ease}.popup-icon{width:56px;height:56px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--color-warning-soft);color:var(--color-warning)}.popup-card h3{margin:0}.popup-card p{margin:0;max-width:340px}.popup-actions{display:flex;gap:var(--spacing-sm);margin-top:var(--spacing-sm)}.popup-start-btn{padding:10px 28px;font-size:15px}.popup-cancel-btn{padding:10px 20px;font-size:15px}.article-section{background:var(--theme-canvas);border-top:1px solid var(--theme-hairline);padding-block:var(--spacing-5xl)}.article-inner{max-width:800px}.article-main-title{margin-top:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.article-lead{font-weight:400}.prose h3{margin-top:var(--spacing-2xl);margin-bottom:var(--spacing-sm)}.guide-list{display:flex;flex-direction:column;gap:var(--spacing-sm);padding-left:20px}.guide-list li strong{color:var(--theme-ink)}.guide-list kbd{display:inline-block;padding:1px 6px;font-family:var(--font-mono);font-size:11px;background:var(--theme-canvas-soft-2);border:1px solid var(--theme-hairline-strong);border-radius:3px;color:var(--theme-ink)}.color-table{display:flex;flex-direction:column;border:1px solid var(--theme-hairline);border-radius:var(--radius-md);overflow:hidden;margin:var(--spacing-lg) 0}.color-table-row{display:flex;align-items:center;gap:var(--spacing-md);padding:10px var(--spacing-md);background:var(--theme-canvas)}.color-table-row:not(:last-child){border-bottom:1px solid var(--theme-hairline)}.color-swatch{width:32px;height:32px;border-radius:var(--radius-sm);flex-shrink:0}.color-table-row span:last-child{font-size:14px;line-height:20px;color:var(--theme-body)}.color-table-row span:last-child strong{color:var(--theme-ink)}.faq-mini-list{display:flex;flex-direction:column;margin-top:var(--spacing-lg)}.faq-mini-item{border-bottom:1px solid var(--theme-hairline);overflow:hidden}.faq-mini-q{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) 0;cursor:pointer;font-size:15px;font-weight:500;line-height:22px;color:var(--theme-ink);list-style:none;user-select:none;transition:color .15s ease}.faq-mini-q::-webkit-details-marker{display:none}.faq-mini-q:hover{color:var(--color-link)}.faq-chevron{flex-shrink:0;transition:transform .25s ease;color:var(--theme-mute)}.faq-mini-item[open] .faq-chevron{transform:rotate(180deg)}.faq-mini-a{padding-bottom:var(--spacing-md);animation:fade-in .3s ease}@media(max-width:768px){.start-screen{padding:var(--spacing-2xl) var(--spacing-lg)}.start-icon{width:64px;height:64px}.start-icon svg,.start-icon i{width:36px;height:36px}.color-badge{font-size:20px;padding:6px 16px}.color-dot{width:12px;height:12px}.color-hex{font-size:12px}.color-navigation-hint{bottom:100px}.hint-text{font-size:11px}.test-controls{padding:var(--spacing-sm);padding-bottom:calc(var(--spacing-sm) + env(safe-area-inset-bottom,0px))}.top-row{gap:var(--spacing-sm)}.bottom-row{flex-direction:column;gap:var(--spacing-sm)}.color-strip{gap:6px;max-width:280px}.color-strip-dot{width:16px;height:16px}.control-btn{padding:6px 12px;font-size:12px}.btn-label{display:none}.jump-btn{width:28px;height:28px;font-size:11px}.check-btn,.exit-btn{padding:6px 12px;font-size:12px}}@media(max-width:480px){.color-strip-dot{width:14px;height:14px;gap:4px}.color-strip{gap:4px;max-width:200px}.jump-label{display:none}.action-group{gap:6px}}