.si-header { margin-bottom: 24px; text-align: center; }
.si-title { font-size: 32px; font-weight: 800; background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin: 0 0 10px; }
.si-desc { font-size: 15px; color: #6b7280; margin: 0; }

.si-ruler-section { padding: 20px; margin-bottom: 20px; }
.si-ruler { position: relative; height: 60px; background: linear-gradient(90deg, #f3f4f6 0%, #e5e7eb 100%); border-radius: 12px; overflow: hidden; }
.si-ruler-marks { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background-image: repeating-linear-gradient(90deg, transparent, transparent 99px, #9ca3af 99px, #9ca3af 100px); }
.si-ruler-label { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 14px; font-weight: 600; color: #4b5563; background: rgba(255,255,255,0.9); padding: 8px 16px; border-radius: 20px; }

.si-display-card, .si-viewport-card, .si-dpr-card, .si-browser-card, .si-features-card { padding: 24px; margin-bottom: 20px; }

.si-section-title { font-size: 16px; font-weight: 600; color: #111827; margin: 0 0 20px; padding-bottom: 12px; border-bottom: 2px solid #e5e7eb; }

.si-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (min-width: 640px) { .si-grid { grid-template-columns: repeat(4, 1fr); } }

.si-small-grid { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .si-small-grid { grid-template-columns: repeat(4, 1fr); } }

.si-item { padding: 16px; background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%); border-radius: 12px; text-align: center; transition: all 0.3s ease; }
.si-item:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.si-item.si-highlight { background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%); border: 1px solid #c4b5fd; }

.si-label { display: block; font-size: 12px; color: #6b7280; margin-bottom: 8px; font-weight: 500; }
.si-value { display: block; font-size: 18px; font-weight: 700; color: #111827; }
.si-value.si-large { font-size: 24px; color: #7c3aed; }
.si-value.si-zoom { color: #059669; }
.si-value.si-small { font-size: 12px; word-break: break-all; color: #6b7280; }
.si-sub { display: block; font-size: 11px; color: #9ca3af; margin-top: 4px; }

.si-dpr-main { text-align: center; padding: 24px; background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%); border-radius: 14px; margin-bottom: 20px; }
.si-dpr-value { font-size: 48px; font-weight: 800; color: #7c3aed; margin-bottom: 12px; }
.si-dpr-bar { width: 100%; max-width: 300px; height: 8px; background: #e5e7eb; border-radius: 4px; margin: 0 auto 12px; overflow: hidden; }
.si-dpr-fill { height: 100%; background: linear-gradient(90deg, #8b5cf6 0%, #6366f1 100%); border-radius: 4px; transition: width 0.3s ease; }
.si-dpr-label { font-size: 14px; color: #6b7280; }

.si-features { display: flex; flex-direction: column; gap: 12px; }
.si-feature-item { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; background: #f9fafb; border-radius: 10px; transition: all 0.2s; }
.si-feature-item:hover { background: #f3f4f6; }
.si-feature-name { font-size: 14px; font-weight: 500; color: #374151; }
.si-feature-status { font-size: 13px; font-weight: 600; padding: 4px 10px; border-radius: 12px; }
.si-feature-status.yes { background: #d1fae5; color: #065f46; }
.si-feature-status.no { background: #fee2e2; color: #991b1b; }
.si-feature-status.unknown { background: #f3f4f6; color: #6b7280; }

.si-guide { padding: 20px; }
.si-guide h3 { font-size: 16px; font-weight: 600; margin: 0 0 16px; }
.si-guide-content { font-size: 14px; line-height: 1.8; color: #374151; }
.si-guide-content h4 { font-size: 14px; font-weight: 600; margin: 16px 0 8px; color: #111827; }
.si-guide-content p { margin: 0 0 12px; }
.si-guide-content ul { padding-left: 20px; margin: 0 0 12px; }
.si-guide-content li { margin: 6px 0; }
.si-guide-content strong { color: #7c3aed; }

.si-refresh { text-align: center; padding: 12px; font-size: 12px; color: #9ca3af; margin-top: 20px; }

@media (max-width: 640px) {
    .si-title { font-size: 24px; }
    .si-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .si-item { padding: 12px; }
    .si-value { font-size: 16px; }
    .si-value.si-large { font-size: 20px; }
    .si-dpr-value { font-size: 36px; }
    .si-ruler-label { font-size: 12px; padding: 6px 12px; }
}

@media (prefers-color-scheme: dark) {
    .si-item { background: linear-gradient(135deg, #1f2937 0%, #111827 100%); }
    .si-item.si-highlight { background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%); border-color: #4c1d95; }
    .si-dpr-main { background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%); }
    .si-feature-item { background: #374151; }
    .si-feature-item:hover { background: #4b5563; }
    .si-section-title { border-color: #374151; }
}