/**
 * 现代化UI样式系统
 * 设计理念：无边框、悬浮效果、大气、动态背景
 */

/* ========== 动态背景系统 ========== */
body {
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.03;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { 
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        opacity: 0.03;
    }
    25% { 
        background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        opacity: 0.02;
    }
    50% { 
        background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        opacity: 0.03;
    }
    75% { 
        background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
        opacity: 0.02;
    }
}

/* 动态粒子背景 */
.dynamic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
    overflow: hidden;
}

.dynamic-bg .particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(33, 150, 243, 0.1);
    animation: float 20s infinite;
}

.dynamic-bg .particle:nth-child(1) {
    width: 80px;
    height: 80px;
    left: 10%;
    animation-duration: 25s;
    animation-delay: 0s;
}

.dynamic-bg .particle:nth-child(2) {
    width: 120px;
    height: 120px;
    left: 30%;
    animation-duration: 30s;
    animation-delay: -5s;
}

.dynamic-bg .particle:nth-child(3) {
    width: 60px;
    height: 60px;
    left: 50%;
    animation-duration: 20s;
    animation-delay: -10s;
}

.dynamic-bg .particle:nth-child(4) {
    width: 100px;
    height: 100px;
    left: 70%;
    animation-duration: 28s;
    animation-delay: -15s;
}

.dynamic-bg .particle:nth-child(5) {
    width: 90px;
    height: 90px;
    left: 85%;
    animation-duration: 22s;
    animation-delay: -8s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.3;
    }
    50% {
        transform: translateY(-100vh) rotate(360deg);
        opacity: 0.1;
    }
}

/* 波浪效果 */
.dynamic-bg .wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 200px;
    background: linear-gradient(90deg, 
        rgba(33, 150, 243, 0.1) 0%, 
        rgba(33, 150, 243, 0.05) 50%, 
        rgba(33, 150, 243, 0.1) 100%);
    animation: wave-move 8s ease-in-out infinite;
    border-radius: 100% 100% 0 0;
}

.dynamic-bg .wave:nth-child(2) {
    height: 180px;
    opacity: 0.7;
    animation-delay: -2s;
    background: linear-gradient(90deg, 
        rgba(102, 126, 234, 0.08) 0%, 
        rgba(102, 126, 234, 0.04) 50%, 
        rgba(102, 126, 234, 0.08) 100%);
}

.dynamic-bg .wave:nth-child(3) {
    height: 160px;
    opacity: 0.5;
    animation-delay: -4s;
    background: linear-gradient(90deg, 
        rgba(118, 75, 162, 0.06) 0%, 
        rgba(118, 75, 162, 0.03) 50%, 
        rgba(118, 75, 162, 0.06) 100%);
}

@keyframes wave-move {
    0%, 100% {
        transform: translateX(0) scaleY(1);
    }
    50% {
        transform: translateX(-25%) scaleY(1.1);
    }
}

/* 星空效果 */
.dynamic-bg .star {
    position: absolute;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 0 4px rgba(255, 255, 255, 0.8);
    animation: twinkle 2s ease-in-out infinite;
}

@keyframes twinkle {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* 渐变流动效果 */
.dynamic-bg.gradient-flow {
    background: linear-gradient(
        -45deg, 
        rgba(33, 150, 243, 0.05), 
        rgba(102, 126, 234, 0.05), 
        rgba(118, 75, 162, 0.05), 
        rgba(255, 107, 107, 0.05)
    );
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 龙卷风效果 */
.dynamic-bg .tornado-particle {
    position: absolute;
    border-radius: 50%;
    animation: tornadoSpin 10s linear infinite;
    transform-origin: center center;
}

@keyframes tornadoSpin {
    0% { 
        transform: rotate(0deg) translateX(150px) translateY(0); 
        opacity: 0; 
    }
    10% { opacity: 0.8; }
    50% { 
        transform: rotate(180deg) translateX(250px) translateY(-50px); 
        opacity: 0.5; 
    }
    90% { opacity: 0.3; }
    100% { 
        transform: rotate(360deg) translateX(150px) translateY(0); 
        opacity: 0; 
    }
}

/* 满天星效果 */
.dynamic-bg .star-particle {
    position: absolute;
    border-radius: 50%;
    animation: twinkleStar 3s ease-in-out infinite;
}

@keyframes twinkleStar {
    0%, 100% {
        opacity: 0.2;
        transform: scale(0.5);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* 九九归一效果 */
.dynamic-bg .gather-particle {
    position: absolute;
    border-radius: 50%;
    animation: gatherCenter 15s ease-in-out infinite;
}

@keyframes gatherCenter {
    0% { 
        transform: translate(0, 0) scale(1); 
        opacity: 0.6; 
    }
    50% { 
        transform: translate(calc(50vw - 50%), calc(50vh - 50%)) scale(0.3); 
        opacity: 0.3; 
    }
    100% { 
        transform: translate(0, 0) scale(1); 
        opacity: 0.6; 
    }
}

/* 萤火虫效果 */
.dynamic-bg .firefly-particle {
    position: absolute;
    border-radius: 50%;
    animation: fireflyFloat 12s ease-in-out infinite;
}

@keyframes fireflyFloat {
    0% { 
        transform: translate(0, 0) scale(1); 
        opacity: 0.2; 
    }
    25% { 
        transform: translate(30px, -40px) scale(1.3); 
        opacity: 0.8; 
    }
    50% { 
        transform: translate(-20px, -60px) scale(0.8); 
        opacity: 0.4; 
    }
    75% { 
        transform: translate(40px, -30px) scale(1.1); 
        opacity: 0.7; 
    }
    100% { 
        transform: translate(0, 0) scale(1); 
        opacity: 0.2; 
    }
}

/* 矩阵雨效果 */
.dynamic-bg .matrix-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.dynamic-bg .matrix-column {
    position: absolute;
    top: -100%;
    width: 20px;
    animation: matrixFall 10s linear infinite;
    font-family: monospace;
    font-size: 14px;
    color: #00ff41;
    text-shadow: 0 0 5px currentColor;
}

.dynamic-bg .matrix-column::before {
    content: '01アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワヲン';
    display: block;
    white-space: pre-wrap;
    line-height: 1.5;
}

@keyframes matrixFall {
    0% { 
        transform: translateY(0); 
        opacity: 0; 
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { 
        transform: translateY(100vh); 
        opacity: 0; 
    }
}

/* 波浪起伏效果 */
.dynamic-bg .waves-container {
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    overflow: hidden;
}

.dynamic-bg .waves-container .wave {
    position: absolute;
    width: 200%;
    height: 100%;
    animation: waveMove 12s linear infinite;
}

.dynamic-bg .waves-container .wave::before {
    content: '';
    position: absolute;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    border-radius: 50% 50% 0 0;
}

.dynamic-bg .waves-container .wave-1 { top: 20%; }
.dynamic-bg .waves-container .wave-2 { top: 40%; animation-delay: -2s; }
.dynamic-bg .waves-container .wave-3 { top: 60%; animation-delay: -4s; }

@keyframes waveMove {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* 自定义图片背景 */
.dynamic-bg .custom-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}

/* 深色模式支持 */
.dynamic-bg.dark {
    background: #0a0a0f;
}

.dynamic-bg.light {
    background: #fafbfc;
}

/* ========== 通用容器和布局 ========== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

.page-wrapper {
    min-height: 100vh;
    background: transparent;
    position: relative;
}

/* ========== 现代化公告栏 ========== */
.announcement-bar {
    background: linear-gradient(90deg, 
        var(--theme-gradient-start, #2196f3) 0%, 
        var(--theme-gradient-end, #21bff3) 50%, 
        var(--theme-color2, #1976d2) 100%);
    padding: 12px 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.announcement-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.announce-container {
    max-width: 95%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-size: 14px;
}

.announce-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    backdrop-filter: blur(10px);
}

.announce-scroll-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.announce-scroll {
    display: inline-block;
    white-space: nowrap;
    animation: scrollLeft 30s linear infinite;
}

@keyframes scrollLeft {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

/* ========== 素材卡片系统 - 无边框、悬浮设计 ========== */
.materials-section {
    padding: 40px 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(0, 0, 0, 0.06);
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0;
    position: relative;
    padding-left: 18px;
    letter-spacing: -0.5px;
}

.section-header h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 32px;
    background: linear-gradient(180deg, var(--theme-gradient-start), var(--theme-gradient-end));
    border-radius: 3px;
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.3);
}

.section-header .view-all {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--theme-color);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(33, 150, 243, 0.08);
}

.section-header .view-all:hover {
    transform: translateX(4px);
    background: rgba(33, 150, 243, 0.15);
}

/* 素材网格 - 响应式 */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

/* 素材卡片 - 无边框、透明背景、悬浮效果 */
.material-card {
    background: transparent;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.material-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

/* 缩略图容器 */
.material-thumb {
    position: relative;
    width: 100%;
    padding-top: 75%;
    overflow: hidden;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.material-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.material-card:hover .material-thumb img {
    transform: scale(1.08);
}

/* 骨架屏加载动画 */
.material-thumb.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 素材标签 - 悬浮在缩略图内部左上角 */
.material-source-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 2;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.material-source-tag.ds { 
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.material-source-tag.cbb { 
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}
.material-source-tag.mocap { 
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}
.material-source-tag.other { 
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

/* 素材信息区 */
.material-info {
    padding: 16px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
}

.material-title {
    font-size: 15px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 10px 0;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.3s;
}

.material-card:hover .material-title {
    color: var(--theme-color);
}

.material-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #8c8c8c;
}

.material-meta .downloads {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 500;
}

.material-meta .downloads i {
    color: var(--theme-color);
    font-size: 13px;
}

.material-price {
    font-weight: 700;
    color: var(--theme-color);
    font-size: 14px;
}

/* ========== 下载页面优化 ========== */
.material-detail-page {
    padding: 40px 0;
}

.detail-container {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.detail-header {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
}

.detail-thumbnail {
    flex: 0 0 480px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.detail-thumbnail img {
    width: 100%;
    height: auto;
    display: block;
}

.detail-info {
    flex: 1;
}

.detail-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0 0 16px 0;
    line-height: 1.3;
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #666;
}

.meta-item i {
    color: var(--theme-color);
    font-size: 16px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 48px;
    background: linear-gradient(135deg, var(--theme-gradient-start), var(--theme-gradient-end));
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 24px rgba(33, 150, 243, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(33, 150, 243, 0.4);
}

.download-btn:active {
    transform: translateY(0);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    .materials-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 16px;
    }
    
    .section-header h2 {
        font-size: 22px;
    }
    
    .detail-header {
        flex-direction: column;
    }
    
    .detail-thumbnail {
        flex: 0 0 auto;
        width: 100%;
    }
    
    .detail-title {
        font-size: 24px;
    }
}

/* ========== 动画效果 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

/* 延迟动画 */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }