/* ========== 中国画栏目专用样式 ========== */
/* 版本: 1.0.0 | 栏目: 中国画 | 作者: 芦笛 */

/* ===== 栏目专属色变量 ===== */
:root {
    --color-chinese-primary: #7B5F4E;
    --color-chinese-dark: #5B3F2E;
    --color-chinese-light: #9B7F6E;
    --color-chinese-pale: #BBA08E;
    --color-ink: #2A2A2A;
    --color-rice: #F7F3ED;
    --color-vermilion: #C45C4A;
    --color-azurite: #4A7C6B;
    --color-malachite: #5A8B5E;
}

/* ===== 页面头部 ===== */
.page-header-painting {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #6B4F3E, #8B6F5E, #7B5F4E, #5A3F2E);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    overflow: hidden;
}

.page-header-painting::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.025'%3E%3Cpath d='M50 50h-5v5h5v-5zm0-40h-5v5h5v-5zM10 50H5v5h5v-5zM10 10H5v5h5v-5z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.page-header-painting::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--color-cream);
    clip-path: ellipse(70% 100% at 50% 100%);
}

/* ===== 面包屑导航 ===== */
.breadcrumb-wrap {
    background: var(--color-cream);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== 概览区 ===== */
.overview-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--color-cream);
}

.overview-container {
    max-width: 1200px;
    margin: 0 auto;
}

.overview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

@media (max-width: 968px) {
    .overview-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

.overview-text h2 {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 3px;
    line-height: 1.4;
}

.overview-text p {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 2;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.overview-quote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--color-primary);
    font-style: italic;
    line-height: 1.8;
}

.overview-quote cite {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    font-style: normal;
}

.overview-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4/3;
    background: var(--color-pale);
    box-shadow: var(--shadow-lg);
}

.overview-visual canvas,
.overview-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.overview-visual:hover canvas,
.overview-visual:hover img {
    transform: scale(1.03);
}

.overview-visual-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-md);
    background: linear-gradient(transparent, rgba(30,30,36,0.7));
    color: white;
    font-size: 0.85rem;
    text-align: center;
}

/* ===== 分类区 ===== */
.categories-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.categories-container {
    max-width: 1200px;
    margin: 0 auto;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }
}

.category-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.category-img {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--color-pale);
    position: relative;
    overflow: hidden;
}

.category-img canvas,
.category-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.category-card:hover .category-img canvas,
.category-card:hover .category-img img {
    transform: scale(1.05);
}

.category-content {
    padding: var(--space-md);
}

.category-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.category-desc {
    font-size: 0.88rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: var(--space-sm);
}

.category-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(155, 127, 110, 0.08);
    color: var(--color-painting-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.category-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: var(--space-sm);
}

.meta-item {
    font-size: 0.78rem;
    color: var(--color-warm-gray);
    opacity: 0.8;
}

.category-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    transition: var(--transition-fast);
}

.category-link:hover {
    gap: 8px;
    color: var(--color-painting-primary);
}

/* ===== 工笔写意对比区 ===== */
.styles-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.styles-container {
    max-width: 1200px;
    margin: 0 auto;
}

.styles-comparison {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
    align-items: stretch;
}

@media (max-width: 968px) {
    .styles-comparison {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    .style-vs {
        display: none;
    }
}

.style-block {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    box-shadow: var(--shadow-sm);
}

.style-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 2px;
}

.style-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid rgba(30, 30, 36, 0.06);
}

.style-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-painting-primary), var(--color-painting-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
    flex-shrink: 0;
}

.style-name {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 2px;
}

.style-name-en {
    font-size: 0.7rem;
    color: var(--color-warm-gray);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 2px;
}

.style-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.style-feature {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.feature-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 1px;
}

.feature-value {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
}

.style-tip {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    background: rgba(196, 167, 125, 0.08);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    border-left: 3px solid var(--color-accent);
}

/* ===== 技法区 ===== */
.techniques-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.techniques-container {
    max-width: 1200px;
    margin: 0 auto;
}

.techniques-intro {
    max-width: 800px;
    margin: 0 auto var(--space-lg);
    text-align: center;
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 2;
    font-weight: 300;
}

.techniques-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .techniques-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .techniques-grid {
        grid-template-columns: 1fr;
    }
}

.technique-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    position: relative;
    overflow: hidden;
}

.technique-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.technique-number {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    opacity: 0.5;
    font-weight: 700;
}

.technique-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 2px;
}

.technique-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.technique-demo {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--color-pale);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--space-sm);
}

.technique-demo canvas {
    width: 100%;
    height: 100%;
}

.technique-representative {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid rgba(30, 30, 36, 0.06);
    font-size: 0.78rem;
}

.rep-label {
    color: var(--color-accent);
    font-weight: 600;
}

.rep-name {
    color: var(--color-warm-gray);
    font-weight: 300;
}

/* ===== 材料区 ===== */
.materials-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.materials-container {
    max-width: 1200px;
    margin: 0 auto;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .materials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .materials-grid {
        grid-template-columns: 1fr;
    }
}

.material-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.material-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.material-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-painting-light), var(--color-painting-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.6rem;
    color: white;
    font-family: var(--font-display);
    font-weight: 700;
    transition: var(--transition-fast);
}

.material-card:hover .material-icon {
    transform: scale(1.1) rotate(-5deg);
}

.material-name {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 2px;
}

.material-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.material-detail {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}

.detail-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(155, 127, 110, 0.08);
    color: var(--color-painting-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* ===== 画论区 ===== */
.theory-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.theory-container {
    max-width: 1200px;
    margin: 0 auto;
}

.theory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .theory-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .theory-grid {
        grid-template-columns: 1fr;
    }
}

.theory-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    position: relative;
    overflow: hidden;
}

.theory-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.theory-era {
    display: inline-block;
    padding: 2px 10px;
    background: var(--color-accent);
    color: white;
    font-size: 0.7rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.theory-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
    letter-spacing: 2px;
}

.theory-author {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-sm);
    font-weight: 300;
}

.theory-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.theory-quote {
    padding: var(--space-sm);
    background: white;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-primary);
    font-style: italic;
    line-height: 1.7;
    border-left: 3px solid var(--color-accent);
}

/* ===== 学习路径区 ===== */
.pathway-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.pathway-container {
    max-width: 1200px;
    margin: 0 auto;
}

.pathway-timeline {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-xl);
    position: relative;
}

.pathway-timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 8%;
    right: 8%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-painting-light), var(--color-accent), transparent);
}

@media (max-width: 768px) {
    .pathway-timeline {
        flex-direction: column;
        gap: var(--space-xl);
    }
    .pathway-timeline::before {
        display: none;
    }
}

.pathway-step {
    text-align: center;
    flex: 1;
    position: relative;
    z-index: 1;
    max-width: 220px;
}

.step-badge {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: white;
    border: 2px solid var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(196, 167, 125, 0.2);
    transition: var(--transition-fast);
}

.pathway-step:hover .step-badge {
    background: var(--color-accent);
    color: white;
    transform: scale(1.1);
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.step-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    font-weight: 300;
    line-height: 1.7;
}

.step-duration {
    display: inline-block;
    margin-top: var(--space-xs);
    padding: 2px 10px;
    background: rgba(155, 127, 110, 0.08);
    color: var(--color-painting-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
}

/* ===== 名作赏析区 ===== */
.masterpieces-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.masterpieces-container {
    max-width: 1200px;
    margin: 0 auto;
}

.masterpieces-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .masterpieces-grid {
        grid-template-columns: 1fr;
    }
}

.masterpiece-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    display: grid;
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 640px) {
    .masterpiece-card {
        grid-template-columns: 1fr;
    }
}

.masterpiece-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.masterpiece-img {
    aspect-ratio: 4/3;
    background: var(--color-pale);
    overflow: hidden;
}

.masterpiece-img canvas,
.masterpiece-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.masterpiece-card:hover .masterpiece-img canvas,
.masterpiece-card:hover .masterpiece-img img {
    transform: scale(1.05);
}

.masterpiece-info {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.masterpiece-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 2px;
}

.masterpiece-meta {
    font-size: 0.75rem;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.masterpiece-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
}

/* ===== 历代名家区 ===== */
.masters-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.masters-container {
    max-width: 1200px;
    margin: 0 auto;
}

.masters-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    position: relative;
}

.masters-timeline::before {
    content: '';
    position: absolute;
    left: 60px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, transparent, var(--color-accent), var(--color-painting-light), var(--color-accent), transparent);
}

@media (max-width: 640px) {
    .masters-timeline::before {
        left: 20px;
    }
}

.master-item {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
    position: relative;
    z-index: 1;
}

.master-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.master-era {
    width: 80px;
    flex-shrink: 0;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    text-align: right;
    padding-top: 4px;
}

@media (max-width: 640px) {
    .master-era {
        width: 40px;
        font-size: 0.75rem;
    }
}

.master-content {
    flex: 1;
}

.master-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.master-desc {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
}

/* ===== 四君子区 ===== */
.junzi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .junzi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .junzi-grid {
        grid-template-columns: 1fr;
    }
}

.junzi-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.junzi-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.junzi-img {
    width: 100%;
    aspect-ratio: 1/1;
    background: var(--color-pale);
    position: relative;
    overflow: hidden;
}

.junzi-img canvas {
    width: 100%;
    height: 100%;
}

.junzi-content {
    padding: var(--space-md);
    text-align: center;
}

.junzi-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
    letter-spacing: 4px;
}

.junzi-virtue {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    letter-spacing: 2px;
}

.junzi-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.junzi-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}

.junzi-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(155, 127, 110, 0.08);
    color: var(--color-painting-primary);
    font-size: 0.7rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* ===== 理论卡片区（人物画） ===== */
.theory-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .theory-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .theory-cards {
        grid-template-columns: 1fr;
    }
}

.theory-cards .theory-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(30, 30, 36, 0.04);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.theory-cards .theory-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.theory-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-painting-light), var(--color-painting-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.2rem;
    color: white;
    font-family: var(--font-display);
    font-weight: 700;
}

.theory-cards .theory-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 2px;
}

.theory-cards .theory-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.theory-quote {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-primary);
    font-style: italic;
    line-height: 1.6;
    padding: var(--space-sm);
    background: var(--color-cream);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xs);
}

.theory-author {
    font-size: 0.75rem;
    color: var(--color-warm-gray);
    font-weight: 300;
}

/* ===== 三远法演示 ===== */
.sanyuan-comparison {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (max-width: 968px) {
    .sanyuan-comparison {
        grid-template-columns: 1fr;
    }
}

.sanyuan-comparison .style-vs {
    display: none;
}

.sanyuan-demo {
    width: 100%;
    aspect-ratio: 4/3;
    background: var(--color-pale);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--space-sm);
}

.sanyuan-demo canvas {
    width: 100%;
    height: 100%;
}

/* ===== 十八描网格 ===== */
.miao-grid {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 968px) {
    .miao-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .miao-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== CTA 区 ===== */
.cta-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(135deg, var(--color-painting-dark), #4A2F1E, var(--color-painting-primary));
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: 3px;
}

.cta-desc {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: var(--space-lg);
    font-weight: 300;
    line-height: 1.9;
}

.cta-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .page-title {
        letter-spacing: 6px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* ===== 动画关键帧补充 ===== */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== 画布占位符样式 ===== */
.canvas-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #E8E0D8, #F0EAE3);
    color: var(--color-warm-gray);
    font-size: 0.85rem;
    font-weight: 300;
}