/* ========== 油画专精页面专用样式 ========== */
/* 版本: 1.0.0 | 栏目: 绘画-油画 | 作者: 芦笛 */



/* ===== 面包屑导航（补充 painting.css 中定义但 oil.css 缺少的样式） ===== */
.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);
}

/* ===== 栏目专属色变量扩展 ===== */
:root {
    --color-oil-primary: #6B4F3E;
    --color-oil-dark: #4A2F1E;
    --color-oil-light: #8B6F5E;
    --color-oil-pale: #AB8F7E;
    --color-oil-cream: #F5F0E8;
    --color-umber: #8B5A2B;
    --color-sienna: #A0522D;
    --color-ochre: #CC7722;
    --color-cadmium: #E8A838;
    --color-ultramarine: #4169E1;
    --color-vermilion: #C45C4A;
    --color-viridian: #40826D;
    --color-ivory: #FFFFF0;
}

/* ===== 页面头部（油画专属） ===== */
.page-header-oil {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #5A3F2E, #7B5F4E, #6B4F3E, #4A2F1E);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    overflow: hidden;
}

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

.page-header-oil .page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    max-width: 800px;
}

.page-header-oil .page-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.85);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 3px;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
    backdrop-filter: blur(8px);
}

.page-header-oil .page-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--space-sm);
    letter-spacing: 12px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.page-header-oil .page-subtitle {
    font-size: 1.05rem;
    opacity: 0.75;
    max-width: 600px;
    margin: 0 auto;
    line-height: 2;
    font-weight: 300;
    letter-spacing: 1px;
}

.page-header-oil .page-header-deco {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 1px solid rgba(196, 167, 125, 0.15);
    border-radius: 50%;
    pointer-events: none;
}

.page-header-oil .page-header-deco:nth-child(1) {
    top: 10%;
    left: 5%;
    width: 150px;
    height: 150px;
    animation: spin-slow 60s linear infinite;
}

.page-header-oil .page-header-deco:nth-child(2) {
    bottom: 15%;
    right: 8%;
    width: 100px;
    height: 100px;
    animation: spin-slow 45s linear infinite reverse;
}

.page-header-oil .page-header-deco:nth-child(3) {
    top: 30%;
    right: 15%;
    width: 60px;
    height: 60px;
    border-color: rgba(196, 167, 125, 0.1);
    animation: spin-slow 30s linear infinite;
}


/* ===== 油画概览区 ===== */
.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 {
    width: 100%;
    height: 100%;
    display: block;
}

.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;
}

/* ===== 艺术史三大流派区 ===== */
.history-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

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

.history-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
    margin-top: var(--space-xl);
}

.history-era {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.history-era:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.history-era.era-reverse {
    direction: rtl;
}

.history-era.era-reverse > * {
    direction: ltr;
}

@media (max-width: 968px) {
    .history-era,
    .history-era.era-reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    .history-era.era-reverse > * {
        direction: ltr;
    }
}

.era-visual {
    position: relative;
    aspect-ratio: 4/3;
    background: var(--color-pale);
    overflow: hidden;
}

.era-visual canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.era-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;
}

.era-content {
    padding: var(--space-xl);
}

.era-badge {
    display: inline-block;
    padding: 0.3rem 0.9rem;
    background: linear-gradient(135deg, var(--color-oil-primary), var(--color-oil-light));
    color: white;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
}

.era-title {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 2px;
}

.era-desc {
    font-size: 0.9rem;
    color: var(--color-warm-gray);
    line-height: 1.9;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.era-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.era-feature {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-cream);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.era-feature:hover {
    background: var(--color-oil-cream);
    transform: translateX(4px);
}

.feature-icon {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent), #b89a6a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    color: white;
    flex-shrink: 0;
    margin-top: 2px;
}

.era-feature h4 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 3px;
    letter-spacing: 1px;
}

.era-feature p {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
    font-weight: 300;
}

.era-masters {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.master-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(107, 79, 62, 0.08);
    color: var(--color-oil-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: var(--transition-fast);
}

.master-tag:hover {
    background: var(--color-oil-primary);
    color: white;
}


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

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

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

@media (max-width: 1024px) {
    .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);
    overflow: hidden;
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
    position: relative;
}

.technique-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-oil-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-normal);
}

.technique-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.technique-card:hover::before {
    transform: scaleX(1);
}

.technique-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-md) var(--space-sm);
}

.technique-number {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-oil-primary), var(--color-oil-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
    font-family: var(--font-display);
}

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

.technique-card-visual {
    position: relative;
    aspect-ratio: 16/9;
    background: var(--color-pale);
    overflow: hidden;
}

.technique-card-visual canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.technique-card-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm);
    background: linear-gradient(transparent, rgba(30,30,36,0.7));
    color: white;
    font-size: 0.75rem;
    text-align: center;
}

.technique-card-body {
    padding: var(--space-md);
}

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

.technique-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.technique-detail {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    font-size: 0.8rem;
    padding: 6px 8px;
    background: white;
    border-radius: var(--radius-sm);
}

.detail-label {
    color: var(--color-oil-primary);
    font-weight: 600;
    flex-shrink: 0;
    min-width: 70px;
}

.detail-value {
    color: var(--color-warm-gray);
    font-weight: 300;
    line-height: 1.5;
}


/* ===== 油画材料指南区 ===== */
.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(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .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);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.material-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-oil-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-normal);
}

.material-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.material-card:hover::before {
    transform: scaleX(1);
}

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

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

.material-name {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.material-desc {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
    font-weight: 300;
}

.material-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.material-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: 8px 10px;
    background: var(--color-cream);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
}

.material-item-label {
    color: var(--color-oil-primary);
    font-weight: 600;
    flex-shrink: 0;
    min-width: 70px;
}

.material-item-value {
    color: var(--color-warm-gray);
    font-weight: 300;
    line-height: 1.5;
}

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

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

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

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

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

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

.masterpiece-card canvas {
    width: 100%;
    height: 100%;
    min-height: 280px;
    display: block;
    object-fit: cover;
}

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

.masterpiece-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 2px;
}

.masterpiece-meta {
    font-size: 0.78rem;
    color: var(--color-oil-primary);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

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

.masterpiece-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
}

.masterpiece-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(107, 79, 62, 0.08);
    color: var(--color-oil-primary);
    font-size: 0.72rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

@media (max-width: 640px) {
    .masterpiece-card {
        grid-template-columns: 1fr;
    }
    .masterpiece-card canvas {
        min-height: 200px;
    }
}

/* ===== 学习路径区（油画六阶） ===== */
.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-oil {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-xl);
    position: relative;
}

.pathway-timeline-oil::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-oil-light), var(--color-accent), transparent);
}

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

.pathway-step-oil {
    text-align: center;
    flex: 1;
    position: relative;
    z-index: 1;
    max-width: 180px;
}

@media (max-width: 768px) {
    .pathway-step-oil {
        max-width: 300px;
        width: 100%;
    }
}

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

.step-title-oil {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.step-desc-oil {
    font-size: 0.78rem;
    color: var(--color-warm-gray);
    font-weight: 300;
    line-height: 1.7;
}

.step-duration-oil {
    display: inline-block;
    margin-top: var(--space-xs);
    padding: 2px 10px;
    background: rgba(107, 79, 62, 0.08);
    color: var(--color-oil-primary);
    font-size: 0.72rem;
    border-radius: var(--radius-full);
}


/* ===== CTA 区 ===== */
.cta-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(135deg, var(--color-oil-dark), #3A1F0E, var(--color-oil-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");
    pointer-events: none;
}

.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;
}

/* ===== 画布占位符 ===== */
.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;
}

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

    .era-content {
        padding: var(--space-lg);
    }

    .masterpiece-info {
        padding: var(--space-md);
    }

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

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

    .material-card {
        padding: var(--space-md);
    }
}

/* ===== 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); }
}

/* ===== 栏目页脚修正 ===== */
.site-footer .logo-mark img {
    height: 80px;
    opacity: 0.9;
}