.demo-card { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; background: var(--code-bg-color); border: 1px solid var(--border-color); border-radius: 12px; padding: 16px; }
.demo-controls { display: flex; gap: 8px; align-items: center; }
.metric { display: inline-block; min-width: 120px; padding: 6px 10px; border-radius: 10px; background: #fff; border: 1px solid var(--border-color); }
.bar { height: 10px; background: linear-gradient(90deg, var(--primary-color), var(--accent-color)); border-radius: 6px; width: 0%; transition: width .2s ease; }
.bar-wrap { background: #eee; border-radius: 6px; overflow: hidden; height: 10px; }
.result-ok { color: #2e7d32; font-weight: 700; }
.result-bad { color: #c62828; font-weight: 700; }
.columns-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.columns-2-vertical { display: grid; grid-template-rows: auto auto; gap: 24px; }
.columns-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.highlight-box { background: #fffbe6; border: 1px solid #ffe58f; border-radius: 10px; padding: 12px; }

/* Media block vertical layout (BEM) */
.media-block { display: grid; grid-template-rows: auto auto; gap: 40px; }
.media-block__text { text-align: left; font-size: clamp(1rem, 1.9vw, 1.05rem); line-height: 1.7; }
.media-block__visual { }
.media-block__visual img, .media-block__visual pre, .media-block__visual table { width: 100%; height: auto; }
.media-block--center .media-block__text { text-align: center; }

/* Smooth scroll and fade-in visuals */
html { scroll-behavior: smooth; }
.fade-in { opacity: 0; transform: translateY(8px); transition: opacity .4s ease, transform .4s ease; }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

/* Generic image rules inside slides */
.slide-content img { max-width: 100%; height: auto; display: block; }

@media (max-width: 1024px) {
  .columns-3 { grid-template-columns: 1fr 1fr; }
  .media-block { gap: 36px; }
}

@media (max-width: 768px) {
  .demo-card { grid-template-columns: 1fr; gap: 12px; }
  .columns-2, .columns-3 { grid-template-columns: 1fr; gap: 12px; }
  .media-block { gap: 28px; }
  .demo-controls { flex-wrap: wrap; gap: 12px; }
  .demo-controls button { flex: 1 1 48%; min-height: 44px; }
  .metric { display: block; width: 100%; min-width: 0; }
  .bar { height: 14px; }
  .bar-wrap { height: 14px; }
}

@media (max-width: 480px) {
  .demo-controls button { flex-basis: 100%; }
  .media-block { gap: 24px; }
  .bar { height: 16px; }
  .bar-wrap { height: 16px; }
}

@media (hover: none) and (pointer: coarse) {
  .demo-controls button { min-height: 44px; min-width: 44px; }
}

.method-cards { display: flex; flex-direction: column; gap: 24px; }
.method-card { background: #fafafa; border: 1px solid #e0e0e0; border-radius: 12px; padding: 20px; display: flex; flex-direction: column; gap: 20px; }
.method-card__info { display: flex; flex-direction: column; gap: 12px; }
.method-card__title { font-size: 1.2rem; font-weight: 600; color: var(--primary-color); margin: 0; }
.method-card__desc { font-size: 0.95rem; line-height: 1.6; color: #555; margin: 0; }
.method-card__points { list-style: none; padding: 0; margin: 0; }
.method-card__points li { padding: 4px 0 4px 20px; position: relative; font-size: 0.9rem; color: #666; }
.method-card__points li::before { content: "•"; position: absolute; left: 0; color: var(--accent-color); font-weight: bold; }
.method-card__code pre { margin: 0; }
.method-card__note { font-size: 0.85rem; color: #e65100; font-weight: 500; margin: 0; }

@media (max-width: 768px) {
  .method-card { gap: 16px; padding: 16px; }
  .method-card__title { font-size: 1.1rem; }
}

/* ============================================
   演示链接卡片样式
   用于链接到独立的演示页面
   ============================================ */

/* 演示链接卡片 */
.demo-link-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.demo-link-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.demo-card-header h3 {
    margin: 0 0 12px 0;
    font-size: 1.3rem;
    color: white;
}

.demo-card-body {
    margin-bottom: 16px;
}

.demo-description {
    margin: 0 0 12px 0;
    line-height: 1.6;
    opacity: 0.95;
}

.demo-highlights {
    margin: 0;
    padding-left: 20px;
    list-style: none;
}

.demo-highlights li {
    margin-bottom: 6px;
    opacity: 0.9;
}

.demo-card-footer {
    text-align: center;
}

.btn-demo-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    color: #667eea;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-demo-link:hover {
    background: #f0f0f0;
    transform: scale(1.05);
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    font-size: 1rem;
}

.btn-hint {
    font-size: 0.8rem;
    opacity: 0.7;
    font-weight: normal;
}

/* 内联按钮样式（更简洁的方案） */
.demo-inline-link {
    margin: 16px 0;
    padding: 16px;
    background: #f8f9fa;
    border-left: 4px solid #667eea;
    border-radius: 8px;
}

.demo-inline-link p {
    margin: 0;
    color: #555;
}

.btn-demo-small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #667eea;
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    margin-left: 8px;
    transition: background 0.2s;
}

.btn-demo-small:hover {
    background: #5568d3;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .demo-link-card {
        padding: 20px;
        margin: 20px 0;
    }

    .demo-card-header h3 {
        font-size: 1.15rem;
    }

    .btn-demo-link {
        padding: 10px 20px;
        font-size: 0.95rem;
    }

    .demo-inline-link {
        padding: 12px;
    }

    .btn-demo-small {
        display: inline-flex;
        margin: 8px 0 0 0;
    }
}