/* ===================================
   青年行动页专用样式（重构版）
   =================================== */

/* [2] Hero区 */
.action-hero {
    height: 50vh;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-primary);
    padding-top: 72px;
}

.action-hero-content {
    text-align: center;
}

.action-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.action-title-en {
    font-family: var(--font-serif-en);
    font-size: 18px;
    font-style: italic;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.action-subtitle {
    font-size: 20px;
    color: var(--color-text-tertiary);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

/* [3] 页面导航标签 */
.page-nav {
    background-color: var(--color-bg-white);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 72px;
    z-index: 100;
}

.nav-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.nav-tab {
    font-size: 16px;
    color: var(--color-text-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-tab:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
}

.nav-tab.active {
    color: var(--color-text-primary);
    font-weight: 500;
    background-color: var(--color-bg-primary);
}

/* ===================================
   8.1 美学挑战赛
   =================================== */

.aesthetic-challenge {
    background-color: var(--color-bg-white);
    padding: var(--spacing-4xl) 0;
}

/* 挑战赛理念 */
.challenge-philosophy {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.challenge-philosophy.animate {
    opacity: 1;
    transform: translateY(0);
}

.philosophy-content {
    text-align: center;
    padding: var(--spacing-2xl);
    background-color: var(--color-bg-primary);
    border-radius: 4px;
}

.philosophy-text {
    font-size: 24px;
    line-height: 2.2;
    color: var(--color-text-secondary);
}

.philosophy-text strong {
    color: var(--color-accent);
}

/* 对比表格 */
.comparison-section {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.comparison-section.animate {
    opacity: 1;
    transform: translateY(0);
}

.subsection-title {
    font-size: 24px;
    font-weight: 500;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.comparison-table {
    display: flex;
    align-items: stretch;
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.comparison-column {
    flex: 1;
    background-color: var(--color-bg-primary);
    border-radius: 4px;
    overflow: hidden;
}

.comparison-column.old {
    opacity: 0.7;
}

.comparison-column.new {
    border: 2px solid var(--color-accent);
}

.column-header {
    padding: var(--spacing-md);
    background-color: var(--color-bg-dark);
    text-align: center;
}

.comparison-column.new .column-header {
    background-color: var(--color-accent);
}

.column-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-inverse);
}

.column-list {
    padding: var(--spacing-lg);
}

.column-list li {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #eee;
}

.column-list li:last-child {
    border-bottom: none;
}

.comparison-arrow {
    display: flex;
    align-items: center;
    font-size: 24px;
    color: var(--color-text-light);
}

/* 挑战赛机制 */
.mechanism-section {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.mechanism-section.animate {
    opacity: 1;
    transform: translateY(0);
}

.mechanism-flow {
    max-width: 600px;
    margin: 0 auto;
}

.flow-step-v {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 500;
    flex-shrink: 0;
}

.step-text h4 {
    font-size: 18px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.step-text p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.flow-arrow-v {
    font-size: 20px;
    color: var(--color-text-light);
    text-align: center;
    padding: var(--spacing-sm) 0;
    margin-left: 10px;
}

/* 当前挑战 */
.current-challenge {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.current-challenge.animate {
    opacity: 1;
    transform: translateY(0);
}

.challenge-banner {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, #2a2a2a 100%);
    padding: var(--spacing-2xl);
    border-radius: 4px;
    text-align: center;
    color: var(--color-text-inverse);
}

.banner-badge {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    font-size: 12px;
    font-weight: 500;
    padding: 4px 16px;
    border-radius: 20px;
    margin-bottom: var(--spacing-md);
}

.banner-title {
    font-size: 32px;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.banner-theme {
    font-size: 18px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.banner-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.meta-item {
    font-size: 14px;
    color: var(--color-text-light);
}

/* 往期作品 */
.past-works {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.past-works.animate {
    opacity: 1;
    transform: translateY(0);
}

.works-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.gallery-item {
    background-color: var(--color-bg-primary);
    border-radius: 4px;
    overflow: hidden;
}

.gallery-image {
    height: 200px;
    background-color: var(--color-bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-info {
    padding: var(--spacing-md);
}

.gallery-info h4 {
    font-size: 18px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.gallery-author {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.gallery-theme {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.gallery-cta {
    text-align: center;
}

/* ===================================
   8.2 全球伙伴计划
   =================================== */

.global-partners {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-4xl) 0;
}

/* 伙伴理念 */
.partners-philosophy {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.partners-philosophy.animate {
    opacity: 1;
    transform: translateY(0);
}

.philosophy-box {
    text-align: center;
    padding: var(--spacing-2xl);
    background-color: var(--color-bg-white);
    border-radius: 4px;
    max-width: 600px;
    margin: 0 auto;
}

.philosophy-highlight {
    font-size: 24px;
    line-height: 2.0;
    color: var(--color-text-secondary);
}

.philosophy-highlight strong {
    color: var(--color-accent);
}

/* 伙伴层级 */
.partner-tiers {
    margin-bottom: var(--spacing-3xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.partner-tiers.animate {
    opacity: 1;
    transform: translateY(0);
}

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

.tier-card {
    background-color: var(--color-bg-white);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.tier-card.featured {
    border: 2px solid var(--color-accent);
}

.tier-header {
    padding: var(--spacing-md);
    background-color: var(--color-bg-dark);
    text-align: center;
}

.tier-card.featured .tier-header {
    background-color: var(--color-accent);
}

.tier-badge {
    display: inline-block;
    font-size: 11px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.tier-card.featured .tier-badge {
    color: rgba(255, 255, 255, 0.8);
}

.tier-name {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-inverse);
    margin-bottom: 2px;
}

.tier-name-en {
    font-family: var(--font-serif-en);
    font-size: 12px;
    font-style: italic;
    color: var(--color-text-light);
}

.tier-card.featured .tier-name-en {
    color: rgba(255, 255, 255, 0.8);
}

.tier-body {
    padding: var(--spacing-md);
    flex: 1;
}

.tier-section {
    margin-bottom: var(--spacing-md);
}

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

.tier-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.tier-body p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.tier-benefits {
    list-style: none;
}

.tier-benefits li {
    font-size: 14px;
    color: var(--color-text-secondary);
    padding: 4px 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.tier-benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 12px;
}

.tier-footer {
    padding: var(--spacing-md);
    border-top: 1px solid #eee;
    text-align: center;
}

.tier-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
}

.tier-link:hover {
    color: var(--color-accent);
}

/* 伙伴地图 */
.partners-map {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.partners-map.animate {
    opacity: 1;
    transform: translateY(0);
}

.map-container {
    margin-bottom: var(--spacing-xl);
}

.map-placeholder {
    height: 300px;
    background-color: var(--color-bg-white);
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
}

.map-stats {
    margin-top: var(--spacing-sm);
    font-size: 14px;
}

.map-stats strong {
    color: var(--color-accent);
}

.partner-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.partner-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--color-bg-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
}

.partner-flag {
    font-size: 18px;
}

.partner-school {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ===================================
   日常实践挑战
   =================================== */

.practice-challenges {
    background-color: var(--color-bg-white);
    padding: var(--spacing-4xl) 0;
}

.principles-intro {
    text-align: center;
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.principles-intro.animate {
    opacity: 1;
    transform: translateY(0);
}

.principles-intro strong {
    color: var(--color-accent);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.principle-card {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: 4px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.3s ease;
}

.principle-card.animate {
    opacity: 1;
    transform: translateY(0);
}

.principle-card:hover {
    box-shadow: var(--shadow-sm);
}

.principle-number {
    font-family: var(--font-serif-en);
    font-size: 48px;
    font-weight: 700;
    color: rgba(201, 74, 74, 0.15);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.principle-title {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.principle-explain {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.principle-example {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-bg-white);
    border-radius: 4px;
}

.example-icon {
    color: var(--color-accent);
    font-weight: 500;
    flex-shrink: 0;
}

.principle-example p {
    font-size: 14px;
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

/* 挑战类型网格 */
.challenge-types-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.challenge-category {
    background-color: var(--color-bg-primary);
    border-radius: 4px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.challenge-category.animate {
    opacity: 1;
    transform: translateY(0);
}

.category-header {
    padding: var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid #eee;
}

.category-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.category-badge.micro {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.category-badge.week {
    background-color: #e3f2fd;
    color: #1565c0;
}

.category-badge.month {
    background-color: #fce4ec;
    color: #c2185b;
}

.category-title {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-primary);
}

.challenge-list {
    padding: var(--spacing-md);
}

.challenge-item {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #eee;
    position: relative;
}

.challenge-item:last-child {
    border-bottom: none;
}

.challenge-item.featured {
    background-color: rgba(201, 74, 74, 0.05);
    margin: 0 calc(-1 * var(--spacing-md));
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
}

.item-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: 0;
    font-size: 11px;
    color: var(--color-accent);
    font-weight: 500;
}

.challenge-item h4 {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.challenge-item p {
    font-size: 14px;
    color: var(--color-text-tertiary);
}

.challenges-cta {
    text-align: center;
}

/* ===================================
   社区展示
   =================================== */

.community-showcase {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-4xl) 0;
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.showcase-item {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.showcase-item.animate {
    opacity: 1;
    transform: translateY(0);
}

.showcase-image {
    aspect-ratio: 1;
    background-color: var(--color-bg-white);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--color-text-light);
}

.showcase-info {
    text-align: center;
}

.showcase-challenge {
    font-size: 14px;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.showcase-author {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.showcase-note {
    text-align: center;
    font-size: 14px;
    color: var(--color-text-tertiary);
}

/* ===================================
   行动召唤
   =================================== */

.action-cta {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.action-cta .cta-title {
    font-size: 32px;
    font-weight: 500;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-sm);
}

.action-cta .cta-subtitle {
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.action-cta .cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.action-cta .btn-primary {
    background-color: var(--color-accent);
}

.action-cta .btn-primary:hover {
    background-color: var(--color-accent-hover);
}

.action-cta .btn-secondary {
    border-color: var(--color-text-inverse);
    color: var(--color-text-inverse);
}

.action-cta .btn-secondary:hover {
    background-color: var(--color-text-inverse);
    color: var(--color-bg-dark);
}

/* ===================================
   响应式设计
   =================================== */

/* 平板 */
@media (max-width: 1199px) {
    .nav-tabs {
        gap: var(--spacing-sm);
    }

    .nav-tab {
        font-size: 14px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .comparison-table {
        flex-direction: column;
    }

    .comparison-arrow {
        transform: rotate(90deg);
        justify-content: center;
        padding: var(--spacing-sm) 0;
    }

    .tiers-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .works-gallery {
        grid-template-columns: repeat(2, 1fr);
    }

    .principles-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: var(--spacing-2xl);
    }

    .challenge-types-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }

    .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 移动端 */
@media (max-width: 767px) {
    .action-title {
        font-size: 40px;
    }

    .action-subtitle {
        font-size: 16px;
    }

    .page-nav {
        top: 72px;
    }

    .nav-tabs {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-xs);
    }

    .nav-tab {
        width: 100%;
        text-align: center;
    }

    .philosophy-text,
    .philosophy-highlight {
        font-size: 20px;
        line-height: 2.0;
    }

    .subsection-title {
        font-size: 20px;
    }

    .banner-title {
        font-size: 24px;
    }

    .banner-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

    .works-gallery {
        grid-template-columns: 1fr;
    }

    .principle-number {
        font-size: 36px;
    }

    .principle-title {
        font-size: 18px;
    }

    .map-placeholder {
        height: 200px;
    }

    .partner-list {
        flex-direction: column;
        align-items: center;
    }

    .action-cta .cta-title {
        font-size: 28px;
    }

    .action-cta .cta-buttons {
        flex-direction: column;
    }
}