/* ==========================================
   全局样式 - 极简风格
   ========================================== */
:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --text-color: #333333;
    --light-gray: #f5f5f5;
    --border-color: #e0e0e0;
    --hover-color: #666666;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ==========================================
   导航栏
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 4px;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    font-size: 14px;
    letter-spacing: 1px;
    color: var(--text-color);
    text-transform: uppercase;
    font-weight: 300;
    padding: 5px 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--primary-color);
}

.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.dropdown-toggle i {
    font-size: 10px;
    transition: var(--transition);
}

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    min-width: 220px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    margin-top: 20px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    border-bottom: 1px solid var(--border-color);
}

.dropdown-menu li:last-child {
    border-bottom: none;
}

.dropdown-menu a {
    display: block;
    padding: 15px 20px;
    font-size: 12px;
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background-color: var(--light-gray);
    padding-left: 30px;
}

.search-wrapper {
    position: relative;
}

.search-icon {
    cursor: pointer;
    font-size: 18px;
    color: var(--text-color);
    transition: var(--transition);
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-icon:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

/* ==========================================
   搜索面板
   ========================================== */
.search-panel {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 100vw;
    max-width: 500px;
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 0;
}

.search-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-container {
    padding: 20px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.search-input {
    width: 100%;
    border: 1px solid var(--border-color);
    padding: 12px 40px 12px 15px;
    font-size: 14px;
    font-weight: 300;
    outline: none;
    background-color: var(--light-gray);
    transition: var(--transition);
    font-family: inherit;
}

.search-input:focus {
    border-color: var(--primary-color);
    background-color: var(--secondary-color);
}

.search-close {
    position: absolute;
    top: 50%;
    right: 30px;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--hover-color);
    transition: var(--transition);
    padding: 5px;
    line-height: 1;
}

.search-close:hover {
    color: var(--primary-color);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
}

.search-results:empty {
    display: none;
}

.search-result-item {
    display: block;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    color: var(--text-color);
}

.search-result-item:hover {
    background-color: var(--light-gray);
    padding-left: 25px;
}

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

.search-result-item h4 {
    font-size: 15px;
    font-weight: 400;
    margin-bottom: 6px;
    color: var(--primary-color);
    line-height: 1.4;
}

.search-result-item p {
    font-size: 13px;
    color: var(--hover-color);
    margin-bottom: 6px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-item span {
    font-size: 11px;
    color: var(--hover-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
}

.search-empty {
    padding: 40px 20px;
    text-align: center;
    color: var(--hover-color);
    font-size: 14px;
}

/* ==========================================
   主横幅
   ========================================== */
.hero {
    margin-top: 80px;
    height: 70vh;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--light-gray);
    position: relative;
    overflow: hidden;
}

/* Audio Waves Background */
.audio-waves {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 250px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 3px;
    padding: 0 0;
    opacity: 0.12;
    z-index: 0;
    pointer-events: none;
}

.wave-bar {
    width: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
    animation: waveAnimation var(--duration, 1.8s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
    min-height: 15px;
    max-height: 150px;
    transform-origin: bottom;
}

@keyframes waveAnimation {
    0% {
        height: 15px;
        transform: scaleY(0.15);
    }
    12% {
        height: 35px;
        transform: scaleY(0.4);
    }
    25% {
        height: 70px;
        transform: scaleY(0.8);
    }
    37% {
        height: 100px;
        transform: scaleY(1.1);
    }
    50% {
        height: 130px;
        transform: scaleY(1.4);
    }
    62% {
        height: 95px;
        transform: scaleY(1.1);
    }
    75% {
        height: 115px;
        transform: scaleY(1.3);
    }
    87% {
        height: 55px;
        transform: scaleY(0.7);
    }
    100% {
        height: 15px;
        transform: scaleY(0.15);
    }
}

.hero-content {
    text-align: center;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
    position: relative;
}

.hero-title {
    font-size: 64px;
    font-weight: 300;
    letter-spacing: 8px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 18px;
    font-weight: 300;
    letter-spacing: 4px;
    color: var(--text-color);
}

/* ==========================================
   区块标题
   ========================================== */
.section-title {
    font-size: 32px;
    font-weight: 300;
    letter-spacing: 4px;
    text-align: center;
    margin-bottom: 60px;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 20px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background-color: var(--primary-color);
}

/* ==========================================
   特色文章区块
   ========================================== */
.featured-section {
    padding: 120px 0;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.featured-card {
    position: relative;
    overflow: hidden;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

.featured-card.large {
    grid-row: span 2;
}

.featured-card:hover {
    transform: translateY(-5px);
}

.card-image {
    position: relative;
    overflow: hidden;
    padding-top: 66.67%;
}

.featured-card.large .card-image {
    padding-top: 100%;
}

.card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.featured-card:hover .card-image img {
    transform: scale(1.05);
}

.category-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    background-color: var(--secondary-color);
    padding: 8px 16px;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 400;
    z-index: 1;
}

.card-content {
    padding: 40px;
}

.card-date {
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--hover-color);
    display: block;
    margin-bottom: 15px;
}

.card-title {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: 1px;
    margin-bottom: 15px;
    color: var(--primary-color);
    line-height: 1.4;
}

.card-excerpt {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-color);
    font-weight: 300;
}

/* ==========================================
   文章列表区块
   ========================================== */
.articles-section {
    padding: 120px 0;
    background-color: var(--light-gray);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 80px;
}

.article-card {
    background-color: var(--secondary-color);
    overflow: hidden;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-card .card-image {
    padding-top: 66.67%;
}

.article-card .card-content {
    padding: 30px;
}

.article-card .card-title {
    font-size: 20px;
}

/* ==========================================
   分页
   ========================================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.page-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background-color: var(--secondary-color);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 300;
}

.page-btn:hover,
.page-btn.active {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    border-color: var(--primary-color);
}

/* ==========================================
   Compact Categories (below hero)
   ========================================== */
.categories-compact {
    padding: 40px 0 60px;
    background-color: var(--secondary-color);
}

.categories-inline {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    background-color: var(--secondary-color);
    font-size: 13px;
    letter-spacing: 0.5px;
    color: var(--text-color);
    transition: var(--transition);
    white-space: nowrap;
}

.category-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tag i {
    font-size: 14px;
    color: var(--hover-color);
    transition: var(--transition);
}

.category-tag:hover i {
    color: var(--primary-color);
}

/* ==========================================
   Full Categories Grid (legacy)
   ========================================== */
.categories-section {
    padding: 120px 0;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.category-item {
    text-align: center;
    padding: 60px 30px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    background-color: var(--secondary-color);
}

.category-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.category-item i {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.category-item h3 {
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: 80px 0 30px;
    margin-top: 120px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 4px;
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 14px;
    font-weight: 300;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
}

.footer-section h4 {
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.social-icons {
    display: flex;
    gap: 20px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 16px;
}

.social-icons a:hover {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--secondary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 12px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 1px;
}

/* ==========================================
   动画
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .container,
    .nav-container {
        padding: 0 30px;
    }

    .hero-title {
        font-size: 48px;
    }

    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--secondary-color);
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        border: none;
        margin-top: 10px;
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .hero {
        height: 50vh;
        min-height: 400px;
    }

    .audio-waves {
        height: 150px;
        gap: 2px;
        padding: 0;
    }

    .wave-bar {
        width: 1.5px;
        max-height: 100px;
    }

    .hero-title {
        font-size: 36px;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .featured-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .featured-card.large {
        grid-row: span 1;
    }

    .featured-card.large .card-image {
        padding-top: 66.67%;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .category-item {
        padding: 40px 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .featured-section,
    .articles-section,
    .categories-section {
        padding: 80px 0;
    }

    .categories-compact {
        padding: 30px 0 50px;
    }

    .categories-inline {
        gap: 10px;
    }

    .category-tag {
        padding: 8px 14px;
        font-size: 12px;
    }

    .category-tag i {
        font-size: 12px;
    }

    .search-panel {
        max-width: calc(100vw - 40px);
        right: -20px;
    }

    .search-input {
        font-size: 14px;
        padding: 10px 35px 10px 12px;
    }

    .search-close {
        right: 20px;
        font-size: 14px;
    }

    .search-result-item {
        padding: 12px 15px;
    }

    .search-result-item h4 {
        font-size: 14px;
    }

    .search-result-item p {
        font-size: 12px;
    }

    .container,
    .search-container {
        padding: 0 20px;
    }
}

@media (max-width: 480px) {
    .audio-waves {
        height: 120px;
        gap: 1px;
        padding: 0;
    }

    .wave-bar {
        width: 1px;
        max-height: 80px;
    }

    .hero-title {
        font-size: 28px;
    }

    .card-content {
        padding: 20px;
    }

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

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

    .categories-compact {
        padding: 25px 0 40px;
    }

    .categories-inline {
        gap: 8px;
    }

    .category-tag {
        padding: 6px 12px;
        font-size: 11px;
    }

    .pagination {
        flex-wrap: wrap;
    }
}