/* .section-header and .section-title moved to page-specific CSS */


.page-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
}

.clean-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    /* border-top: 1px solid var(--accent-subtle); */
}

.clean-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 20px 20px;
    margin: 0 -20px;
    border-bottom: 1px solid var(--accent-subtle);
    text-decoration: none;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

.clean-list > *:first-child {
    border-top: 1px solid var(--accent-subtle);
}

.clean-list.no-border-top > *:first-child {
    border-top: none;
}

.clean-item:hover { background-color: var(--hover-bg); }

.clean-item-title {
    font-size: 1.2rem;
    font-weight: 500;
}

.clean-item-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.clean-item-index {
    font-size: 0.78rem;
    color: var(--text-secondary);
    opacity: 0.55;
    letter-spacing: 0.04em;
    min-width: 3ch;
    text-align: right;
}

.clean-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 2rem;
}

.clean-card {
    background: var(--tile-bg-1);
    border: 1px solid var(--accent-subtle);
    border-radius: 8px;
    padding: 30px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.clean-card:hover {
    /* transform: translateY(-2px); -- Removed per user preference */
    /* 克制而优雅的阴影：增加纵深感，但边缘柔和 */
    box-shadow: 0 12px 24px -6px rgba(0,0,0,0.08), 0 4px 8px -2px rgba(0,0,0,0.04);
    /* 边框微调：比默认边框稍深，提升轮廓清晰度 */
    border-color: var(--text-secondary);
}

[data-theme="dark"] .clean-card:hover {
    /* 暗色模式下：通过背景微亮和更强的阴影来体现层级 */
    background-color: var(--tile-bg-2);
    box-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.5);
    border-color: var(--text-primary);
}

.clean-card h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.clean-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    counter-reset: process-counter;
    margin-top: 20px;
}

.process-step {
    position: relative;
    padding-top: 10px;
}

.process-step::before {
    counter-increment: process-counter;
    content: "0" counter(process-counter);
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent-subtle);
    position: absolute;
    top: -35px;
    left: -5px;
    z-index: -1;
    opacity: 0.6;
    line-height: 1;
}

.step-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-top: 20px;
    color: var(--text-primary);
    line-height: 1.5;
}

.philosophy-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.philosophy-list {
    list-style: none;
}

.philosophy-list li {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    padding-left: 20px;
    position: relative;
    border-left: 2px solid var(--accent-subtle);
    transition: all 0.3s ease;
}

.philosophy-list li:hover {
    border-left-color: var(--text-primary);
    color: var(--text-primary);
}

.philosophy-text p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 25px;
}

.philosophy-text p:last-child {
    margin-bottom: 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .clean-item { flex-direction: column; gap: 5px; }
    .philosophy-wrapper { grid-template-columns: 1fr; gap: 40px; }
}

/* Tag Cloud Styles */
.tag-cloud-link {
    --tag-hue-final: var(--tag-hue, 270);
    
    /* Light Mode Default Variables */
    --tag-text-lightness: 40%;   /* Darker text for readability on light bg */
    --tag-bg-lightness: 90%;     /* Light pastel bg for Soft variant */
    --tag-solid-bg-lightness: 45%; /* Medium darkness for Solid bg (white text) */
    --tag-solid-text-color: #ffffff;
    
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6em 1.2em;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    line-height: 1;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Default Colors (Soft Variant Base) */
    color: hsl(var(--tag-hue-final), 80%, var(--tag-text-lightness));
    background-color: hsla(var(--tag-hue-final), 80%, 50%, 0.1);
    border: 1px solid transparent;
}

/* Dark Mode Overrides */
[data-theme="dark"] .tag-cloud-link {
    --tag-text-lightness: 85%;   /* Light text for dark bg */
    --tag-bg-lightness: 20%;     /* Darker bg for Soft variant */
    --tag-solid-bg-lightness: 35%; /* Darker solid bg so white text pops, or use black text? */
    /* 
       Issue: White text on HSL(hue, 80%, 35%) is good contrast. 
       User complained about "light background white text". 
       So we ensure the Solid BG is NOT too light in dark mode.
    */
}

/* Size System Classes - Optimized for Balance */
.tag-size-1 { font-size: 0.85rem; padding: 0.4em 0.8em; opacity: 0.85; }
.tag-size-2 { font-size: 1.0rem; padding: 0.5em 1.0em; opacity: 0.9; }
.tag-size-3 { font-size: 1.2rem; padding: 0.6em 1.2em; }
.tag-size-4 { font-size: 1.5rem; padding: 0.7em 1.4em; }
.tag-size-5 { font-size: 1.75rem; padding: 0.75em 1.5em; letter-spacing: -0.015em; } /* Reduced from 2.0rem to 1.75rem */

/* Variant: Solid */
.tag-cloud-link.tag-solid {
    background-color: hsl(var(--tag-hue-final), 75%, var(--tag-solid-bg-lightness));
    color: var(--tag-solid-text-color);
    box-shadow: 0 4px 10px hsla(var(--tag-hue-final), 70%, 50%, 0.3);
}

/* Adjust Solid for Dark Mode specifically if needed */
[data-theme="dark"] .tag-cloud-link.tag-solid {
    /* Make background slightly darker to ensure white text contrast, 
       but keep saturation high for "glow" effect */
    background-color: hsl(var(--tag-hue-final), 85%, 30%); 
    box-shadow: 0 4px 15px hsla(var(--tag-hue-final), 80%, 40%, 0.4);
    border: 1px solid hsla(var(--tag-hue-final), 80%, 60%, 0.2);
}

/* Variant: Outline */
.tag-cloud-link.tag-outline {
    background-color: transparent;
    border: 2px solid hsl(var(--tag-hue-final), 70%, var(--tag-text-lightness));
    color: hsl(var(--tag-hue-final), 80%, var(--tag-text-lightness));
}

/* Variant: Soft */
.tag-cloud-link.tag-soft {
    background-color: hsla(var(--tag-hue-final), 70%, 50%, 0.1);
    color: hsl(var(--tag-hue-final), 80%, var(--tag-text-lightness));
    border: 1px solid hsla(var(--tag-hue-final), 70%, 50%, 0.15);
}

[data-theme="dark"] .tag-cloud-link.tag-soft {
    background-color: hsla(var(--tag-hue-final), 70%, 50%, 0.15);
    color: hsl(var(--tag-hue-final), 90%, 85%); /* Very light text */
    border-color: hsla(var(--tag-hue-final), 70%, 50%, 0.3);
}

.tag-cloud-link:hover {
    transform: translateY(-4px) scale(1.05) !important;
    box-shadow: 0 8px 20px hsla(var(--tag-hue-final), 70%, 50%, 0.4);
    z-index: 10;
}

.tag-cloud-count {
    margin-left: 0.5em;
    font-size: 0.8em;
    font-weight: 400;
    opacity: 0.8;
}

.tag-header {
    margin-bottom: 20px;
    padding-bottom: 10px;
    /* Use hue for border */
    --tag-hue-final: var(--tag-hue, 270);
    border-bottom: 2px solid hsl(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness));
    color: hsl(var(--tag-hue-final), var(--tag-saturation), var(--tag-lightness));
    display: flex;
    align-items: center;
}

/* Clean Link Styles (for back navigation etc.) */
.clean-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border: 1px solid var(--accent-subtle);
    border-radius: 30px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: all 0.2s ease;
    background-color: transparent;
}

.clean-link:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background-color: var(--hover-bg);
    transform: translateX(-3px);
}