/* ===== Case Card (Original Full-width Style - kept for potential reuse) ===== */
.case-full {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 48px;
}

.case-full:last-child {
    margin-bottom: 0;
}

.case-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.case-visual {
    background: var(--bg-elevated);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 32px;
    text-align: center;
    position: relative;
}

.case-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(192, 132, 252, 0.04) 0%, transparent 70%);
}

.case-emoji {
    font-size: 56px;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.case-visual .code-block {
    position: relative;
    z-index: 1;
    text-align: left;
}

.case-info {
    padding: 40px 36px;
}

.case-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 6px;
    display: block;
}

.case-info h2 {
    font-size: 24px;
    margin-bottom: 6px;
}

.case-info .case-sub {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 20px;
    display: block;
}

.case-info p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 12px;
}

.case-stats {
    display: flex;
    gap: 24px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-subtle);
}

.case-stat-item {
    text-align: center;
}

.case-stat-item .val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.case-stat-item .lbl {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

.case-detail {
    padding: 32px 36px;
    border-top: 1px solid var(--border-subtle);
}

.case-detail h3 {
    font-size: 16px;
    margin-bottom: 16px;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.detail-item {
    padding: 16px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
}

.detail-item h4 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--accent);
    margin-bottom: 6px;
}

.detail-item p {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.7;
}


/* ===== Three-Tier Architecture Section ===== */

/* --- Tier Section --- */
.tier-section {
    margin-bottom: 64px;
}

.tier-section:last-child {
    margin-bottom: 0;
}

.tier-header {
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-subtle);
    position: relative;
}

.tier-header::before {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 80px;
    height: 2px;
}

.tier-section--automation .tier-header::before {
    background: linear-gradient(90deg, #a78bfa, #818cf8);
}

.tier-section--assistance .tier-header::before {
    background: linear-gradient(90deg, #34d399, #6ee7b7);
}

.tier-section--augmentation .tier-header::before {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.tier-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tier-section--automation .tier-number {
    color: #a78bfa;
}

.tier-section--assistance .tier-number {
    color: #34d399;
}

.tier-section--augmentation .tier-number {
    color: #f59e0b;
}

.tier-icon {
    font-size: 18px;
}

.tier-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.tier-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Sub-Tier (e.g. 代码化, Skill化) --- */
.sub-tier {
    margin-bottom: 40px;
}

.sub-tier:last-child {
    margin-bottom: 0;
}

.sub-tier-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 6px;
    display: block;
}

.sub-tier-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.sub-tier-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

/* --- Module Group (5大模块) --- */
.module-group {
    margin-bottom: 28px;
}

.module-group:last-child {
    margin-bottom: 0;
}

.module-label {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.module-label .module-emoji {
    font-size: 16px;
}

/* --- Compact Card Grid --- */
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 20px 22px;
    transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
    position: relative;
    overflow: hidden;
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.case-card:hover {
    border-color: rgba(192, 132, 252, 0.3);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.case-card:hover::before {
    opacity: 1;
}

.case-card-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 1.5px;
    color: var(--accent);
    opacity: 0.7;
    margin-bottom: 8px;
    display: block;
}

.case-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.case-card-desc {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.case-card-value {
    font-size: 11.5px;
    color: var(--text-muted);
    line-height: 1.6;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
    font-style: italic;
}

.case-card-value strong {
    color: var(--accent);
    font-weight: 600;
    font-style: normal;
}

/* --- Augment/Assist Case Card (larger, emphasize) --- */
.augment-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.augment-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 24px;
    transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
    position: relative;
}

.augment-card:hover {
    border-color: rgba(192, 132, 252, 0.3);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.augment-card-emoji {
    font-size: 32px;
    margin-bottom: 12px;
    display: block;
}

.augment-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.augment-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 14px;
}

.augment-card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.augment-card-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: 100px;
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    background: var(--bg-elevated);
}

/* Placeholder card for upcoming cases */
.augment-card--placeholder {
    border-style: dashed;
    opacity: 0.5;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 180px;
}

.augment-card--placeholder .augment-card-title {
    color: var(--text-muted);
}

.augment-card--placeholder .augment-card-desc {
    color: var(--text-muted);
}

/* --- Skill Showcase --- */
.skill-showcase {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 28px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 24px;
    align-items: start;
}

.skill-icon-block {
    width: 64px;
    height: 64px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.skill-content .skill-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.skill-content .skill-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 14px;
}

.skill-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.skill-flow-step {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.5px;
    padding: 4px 12px;
    border-radius: 100px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    white-space: nowrap;
}

.skill-flow-arrow {
    color: var(--accent);
    font-size: 12px;
    opacity: 0.6;
}


/* ===== Responsive ===== */
@media (max-width: 768px) {
    .case-header {
        grid-template-columns: 1fr;
    }

    .case-visual {
        min-height: 180px;
    }

    .tier-title {
        font-size: 22px;
    }

    .case-grid {
        grid-template-columns: 1fr;
    }

    .augment-grid {
        grid-template-columns: 1fr;
    }

    .skill-showcase {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .skill-icon-block {
        margin: 0 auto;
    }

    .skill-flow {
        justify-content: center;
    }
}