/* ========== 篆书专精页面专用样式 ========== */
/* 版本: 1.0.0 | 栏目: 书法-篆书专精 | 作者: 芦笛 */

/* ===== 页面头部专属样式 ===== */
.page-header-zhuanshu {
    background: linear-gradient(135deg, #5B4A63, #4A3F50, #6B5B73, #3A2F40);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
}

.zhuanshu-title-wrap {
    position: relative;
    display: inline-block;
}

.zhuanshu-seal-mark {
    position: absolute;
    top: -20px;
    right: -60px;
    width: 70px;
    height: 70px;
    border: 2px solid rgba(196, 167, 125, 0.4);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: rgba(196, 167, 125, 0.6);
    transform: rotate(-8deg);
    pointer-events: none;
}

@media (max-width: 768px) {
    .zhuanshu-seal-mark {
        width: 50px;
        height: 50px;
        font-size: 1.4rem;
        right: -45px;
        top: -15px;
    }
}

/* ===== 概览区按钮组 ===== */
.overview-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    flex-wrap: wrap;
}

/* ===== 篆书源流时间轴 ===== */
.history-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

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

.history-timeline {
    position: relative;
    max-width: 900px;
    margin: var(--space-xl) auto 0;
}

.timeline-line {
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-calligraphy-light), var(--color-accent));
}

@media (min-width: 769px) {
    .timeline-line {
        left: 50%;
        transform: translateX(-50%);
    }
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
}

@media (min-width: 769px) {
    .timeline-item {
        justify-content: flex-end;
        padding-right: calc(50% + var(--space-lg));
    }
    .timeline-item:nth-child(even) {
        justify-content: flex-start;
        padding-right: 0;
        padding-left: calc(50% + var(--space-lg));
    }
}

@media (max-width: 768px) {
    .timeline-item {
        padding-left: 60px;
    }
}

.timeline-dot {
    position: absolute;
    left: 16px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--color-accent);
    z-index: 2;
    flex-shrink: 0;
}

@media (min-width: 769px) {
    .timeline-dot {
        left: 50%;
        transform: translateX(-50%);
    }
}

.timeline-item.highlight .timeline-dot {
    background: var(--color-seal-red);
    box-shadow: 0 0 0 3px var(--color-seal-red);
    width: 20px;
    height: 20px;
    top: 6px;
}

.timeline-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
    flex: 1;
    max-width: 420px;
}

.timeline-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.timeline-period {
    display: inline-block;
    padding: 2px 10px;
    background: rgba(123, 107, 131, 0.1);
    color: var(--color-calligraphy-primary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.timeline-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;
}

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

.timeline-works {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.work-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(196, 167, 125, 0.12);
    color: var(--color-accent);
    font-size: 0.72rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* ===== 篆书分类区 ===== */
.category-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

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

.category-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
}

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

.category-card {
    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);
    transition: var(--transition-normal);
}

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

.category-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, 0.04);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-calligraphy-primary), var(--color-calligraphy-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.category-name {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 2px;
}

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

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

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

.feature-item {
    display: flex;
    gap: var(--space-sm);
    font-size: 0.85rem;
    line-height: 1.6;
}

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

.feature-value {
    color: var(--color-warm-gray);
    font-weight: 300;
}

.category-canvas-wrap {
    background: var(--color-cream);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    text-align: center;
}

.category-canvas-wrap canvas {
    width: 100%;
    height: auto;
    max-width: 400px;
}

.canvas-label {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-warm-gray);
    font-weight: 300;
}

/* ===== 经典范本区 ===== */
.masterpiece-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

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

.masterpiece-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
}

.masterpiece-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.masterpiece-item:hover {
    box-shadow: var(--shadow-lg);
}

.masterpiece-item.reverse {
    direction: rtl;
}

.masterpiece-item.reverse > * {
    direction: ltr;
}

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

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

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

.masterpiece-overlay {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
}

.masterpiece-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-calligraphy-primary);
    color: white;
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

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

.masterpiece-meta {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
}

.meta-dynasty,
.meta-type {
    display: inline-block;
    padding: 2px 10px;
    background: rgba(123, 107, 131, 0.08);
    color: var(--color-calligraphy-primary);
    font-size: 0.72rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.masterpiece-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
    letter-spacing: 2px;
}

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

.masterpiece-desc {
    font-size: 0.88rem;
    color: var(--color-warm-gray);
    line-height: 1.9;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.masterpiece-desc p + p {
    margin-top: var(--space-xs);
}

.masterpiece-points {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.masterpiece-points h5 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
}

.masterpiece-points ul {
    list-style: none;
    padding: 0;
}

.masterpiece-points li {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    padding-left: 16px;
    position: relative;
    font-weight: 300;
}

.masterpiece-points li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.5rem;
    top: 2px;
}

.masterpiece-points li + li {
    margin-top: 4px;
}

/* ===== 技法详解区 ===== */
.technique-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

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

.technique-tabs {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
    margin: var(--space-lg) 0 var(--space-md);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.6rem 1.5rem;
    background: white;
    border: 1.5px solid rgba(30, 30, 36, 0.08);
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 1px;
}

.tab-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-primary);
}

.tab-btn.active {
    background: var(--color-calligraphy-primary);
    color: white;
    border-color: var(--color-calligraphy-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.technique-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

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

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

.technique-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

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

.technique-canvas-wrap {
    background: var(--color-cream);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    margin-bottom: var(--space-sm);
    text-align: center;
}

.technique-canvas-wrap canvas {
    width: 100%;
    height: auto;
    max-width: 300px;
}

.technique-card h4 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
}

.technique-card p {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
}

/* ===== 学习路径扩展 ===== */
.zhuanshu-path .step-books {
    margin-top: var(--space-xs);
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
}

.book-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(196, 167, 125, 0.12);
    color: var(--color-accent);
    font-size: 0.7rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* ===== FAQ区 ===== */
.faq-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-list {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.faq-item {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item.active {
    box-shadow: var(--shadow-md);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-question:hover {
    background: rgba(123, 107, 131, 0.03);
}

.faq-q {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-calligraphy-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.faq-question h4 {
    flex: 1;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 1px;
}

.faq-toggle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(123, 107, 131, 0.08);
    color: var(--color-calligraphy-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 300;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
    background: var(--color-calligraphy-primary);
    color: white;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 var(--space-md);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--space-md) var(--space-md);
}

.faq-answer p {
    font-size: 0.88rem;
    color: var(--color-warm-gray);
    line-height: 1.9;
    font-weight: 300;
}

/* ===== 相关推荐区 ===== */
.relate-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

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

.relate-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

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

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

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

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

.relate-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-calligraphy-light), var(--color-calligraphy-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
}

.relate-card h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
    letter-spacing: 1px;
}

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

.relate-link {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    transition: var(--transition-fast);
}

.relate-card:hover .relate-link {
    color: var(--color-calligraphy-primary);
}

/* ===== Canvas 通用样式 ===== */
canvas {
    display: block;
}

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .overview-actions {
        flex-direction: column;
    }
    .overview-actions .btn {
        width: 100%;
        max-width: 280px;
    }

    .technique-tabs {
        gap: 6px;
    }
    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }

    .faq-question h4 {
        font-size: 0.9rem;
    }
}