* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

html,
body {
    cursor: url("//static.notanote.cn/images/small-img/cursor.png") 16 16, auto;
}

a,
button,
[role="button"],
input,
select,
textarea,
label {
    cursor: url("//static.notanote.cn/images/small-img/cursor.png") 16 16, pointer;
}

:root {
    --primary-color: #e74c3c;
    --secondary-color: #9b59b6;
    --dark-bg: #ffdada;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--dark-bg);
    color: #fff;
    overflow-x: hidden;
    line-height: 1.6;
}

.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
}

.video-background video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* opacity: 0.4; */
    filter: brightness(0.6);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 10, 15, 0);
    /* backdrop-filter: blur(20px); */
    /* border-bottom: 1px solid var(--glass-border); */
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
}

.navbar.visible {
    opacity: 1;
    visibility: visible;
}

.navbar.scrolled {
    /* padding: 0.75rem 2rem; */
    background: rgba(10, 10, 15, 0.55);
    backdrop-filter: blur(20px);
    /* border-bottom: 1px solid var(--glass-border); */
}

.navbar a {
    font-size: 120%;
}

.logo {
    height: 28px;
    transition: transform 0.3s ease;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: #fff;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 开屏加载动画 */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    pointer-events: all;
    transition: background-color 0.3s ease, opacity 0.3s ease;
}

.splash-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.splash-text-sequence {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.splash-text-item {
    position: absolute;
    text-align: center;
    padding: 0 2rem;
    max-width: 800px;
    font-size: clamp(1.2rem, 3vw, 2rem);
    color: #fff;
    opacity: 0;
    transform: scale(1);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
    line-height: 1.8;
    font-weight: 300;
}

.splash-text-item.active {
    animation: textSequence 3.5s ease-in-out forwards;
}

@keyframes textSequence {
    0% {
        opacity: 0;
        transform: scale(1);
    }

    28.57% {
        opacity: 1;
        transform: scale(1);
    }

    71.43% {
        opacity: 1;
        transform: scale(1);
    }

    100% {
        opacity: 0;
        transform: scale(0.95);
    }
}

.splash-bg-blur {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 1;
    transform: scale(1.25);
    transition: transform 13s ease-out, opacity 3s ease;
}

.splash-bg-blur img,
.splash-bg-blur video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: blur(20px);
}

.splash-bg-blur.animate {
    transform: scale(1);
}

.splash-bg-blur.fade-out {
    opacity: 0;
}

.splash-skip-hint {
    position: fixed;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    opacity: 0;
    animation: fadeInOut 2s ease-in-out infinite;
    animation-delay: 1s;
    cursor: pointer;
    user-select: none;
}

@keyframes fadeInOut {

    0%,
    100% {
        opacity: 0;
    }

    50% {
        opacity: 0.7;
    }
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transition: opacity 1s ease;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: 2rem;
}

.hero-logo {
    width: min(280px, 60vw);
    margin-bottom: 2rem;
}

.hero-slogan {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 50%, #fbc2eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
    line-height: 1.4;
}

.hero-description {
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.8rem;
    line-height: 1.8;
    font-weight: 400;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-description:nth-of-type(1) {
    animation-delay: 0.4s;
    font-size: clamp(1.15rem, 2.7vw, 1.4rem);
    margin-bottom: 1.2rem;
}

.hero-description:nth-of-type(2) {
    animation-delay: 0.5s;
    color: rgba(255, 255, 255, 0.75);
    font-size: clamp(1rem, 2.3vw, 1.2rem);
}

.hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.15rem);
    color: rgba(255, 255, 255, 0.5);
    margin-top: 2rem;
    margin-bottom: 3rem;
    padding-top: 1.5rem;
    font-weight: 300;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.6s;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    letter-spacing: 1px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 下载按钮组 */
.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.8s;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-outline {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    color: #fff;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    /* transform: translateY(-3px); */
}

.btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* 滚动提示 */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator svg {
    width: 32px;
    height: 32px;
    fill: rgba(255, 255, 255, 0.5);
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

/* 歌曲区域 */
.songs {
    position: relative;
    padding: 6rem 0;
    background: rgba(18, 18, 26, 0.85);
    backdrop-filter: blur(10px);
}

.songs-header {
    padding: 0 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff, rgba(255, 255, 255, 0.6));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* 横向滚动容器 */
.songs-scroll-container {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.songs-scroll {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    padding: 1rem 0 2rem;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -ms-overflow-style: none;
    scroll-behavior: smooth;
}

.songs-scroll::-webkit-scrollbar {
    display: none;
}

/* 滚动箭头按钮 */
.scroll-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.scroll-arrow:hover {
    background: rgba(231, 76, 60, 0.3);
    border-color: rgba(231, 76, 60, 0.5);
    transform: translateY(-50%) scale(1.1);
}

.scroll-arrow:active {
    transform: translateY(-50%) scale(0.95);
}

.scroll-arrow svg {
    width: 24px;
    height: 24px;
    fill: rgba(255, 255, 255, 0.8);
}

.scroll-arrow.left {
    left: -24px;
}

.scroll-arrow.right {
    right: -24px;
}

.scroll-arrow.hidden {
    opacity: 0;
    pointer-events: none;
}

.song-card {
    flex: 0 0 260px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    scroll-snap-align: start;
}

.song-card:hover {
    transform: translateY(-10px);
    border-color: rgba(231, 76, 60, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.song-cover {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.song-info {
    padding: 1.5rem;
}

.song-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-artist {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.song-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.song-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(231, 76, 60, 0.2);
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--primary-color);
}

.song-difficulty {
    padding: 0.25rem 0.75rem;
    background: rgba(155, 89, 182, 0.2);
    border: 1px solid rgba(155, 89, 182, 0.3);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--secondary-color);
}


@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* 页脚 */
.footer {
    position: relative;
    padding: 3rem 2rem;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    text-align: center;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.9rem;
}

.footer-copyright a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
}

/* 右下角悬浮按钮容器 */
.fab-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-end;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.fab-container.visible {
    opacity: 1;
    visibility: visible;
}

/* 服务状态悬浮按钮 */
.status-fab {
    position: relative;
}

.status-fab-button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.status-fab-button.status-ok {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
}

.status-fab-button.status-maintenance {
    background: linear-gradient(135deg, var(--primary-color), #c0392b);
}

.status-fab-button:hover {
    transform: scale(1.1);
}

.status-fab-button svg {
    width: 24px;
    height: 24px;
    fill: #fff;
}

/* 服务状态弹窗 */
.status-popup {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 300px;
    background: rgba(18, 18, 26, 0.95);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
    transition: all 0.3s ease;
    padding: 1.25rem;
}

.status-popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.status-popup-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-indicator.ok {
    background: #27ae60;
    box-shadow: 0 0 10px rgba(39, 174, 96, 0.5);
}

.status-indicator.maintenance {
    background: var(--primary-color);
    box-shadow: 0 0 10px rgba(231, 76, 60, 0.5);
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.status-popup-title {
    font-size: 1rem;
    font-weight: 600;
}

.status-popup-content {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

.status-popup-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.85rem;
}

.status-popup-link:hover {
    text-decoration: underline;
}

/* 社区悬浮按钮 */
.community-fab {
    position: relative;
}

.fab-button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(231, 76, 60, 0.4);
    transition: all 0.3s ease;
}

.fab-button:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(231, 76, 60, 0.6);
}

.fab-button svg {
    width: 28px;
    height: 28px;
    fill: #fff;
    transition: transform 1000.3s;
}

.fab-button.active svg {
    transform: rotate(36000000deg);
}

/* 社区弹窗 */
.community-popup {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 320px;
    background: rgba(18, 18, 26, 0.95);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
    transition: all 0.3s ease;
}

.community-popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.popup-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.popup-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.popup-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.popup-subtitle {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

.popup-content {
    padding: 1.5rem;
}

.popup-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.popup-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.popup-item:last-child {
    margin-bottom: 0;
}

.popup-item-icon {
    width: 40px;
    height: 40px;
    background: rgba(231, 76, 60, 0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.popup-item-icon.steam {
    background: rgba(102, 192, 244, 0.2);
}

.popup-item-icon.taptap {
    background: #00D9C5;
}

.popup-item-text {
    flex: 1;
}

.popup-item-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}

.popup-item-value {
    font-weight: 600;
    color: #fff;
}

/* 复制成功提示 */
.copy-toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(39, 174, 96, 0.9);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1001;
}

.copy-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* 鼠标拖尾特效 */
.mouse-trail {
    position: fixed;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(231, 76, 60, 0.8), rgba(155, 89, 182, 0.4));
    pointer-events: none;
    z-index: 9999;
    animation: trailFade 0.6s ease-out forwards;
    box-shadow: 0 0 10px rgba(231, 76, 60, 0.6);
}

@keyframes trailFade {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    100% {
        transform: scale(0);
        opacity: 0;
    }
}

/* 回到顶部按钮 */
.back-to-top {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #34495e, #2c3e50);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.back-to-top:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(52, 73, 94, 0.6);
}

.back-to-top svg {
    width: 28px;
    height: 28px;
    fill: #fff;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar {
        position: fixed;
        top: 10px;
        left: 10px;
        right: 10px;
        width: calc(100% - 20px);
        height: auto;
        min-height: 120px;
        flex-direction: column;
        align-items: center;
        padding: 1.25rem 1rem;
        gap: 0.875rem;
        background: rgba(18, 18, 26, 0.95);
        border-radius: 16px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        transition: all 0.3s ease;
    }

    .navbar.scrolled {
        top: 5px;
        left: 5px;
        right: 5px;
        width: calc(100% - 10px);
        min-height: 80px;
        padding: 0.75rem 0.75rem;
        gap: 0.5rem;
        background: rgba(18, 18, 26, 0.98);
        border-radius: 12px;
    }

    .logo {
        height: 32px;
        margin-top: 0.25rem;
        transition: all 0.3s ease;
    }

    .navbar.scrolled .logo {
        height: 26px;
        margin-top: 0;
    }

    .nav-links {
        display: flex;
        flex-direction: row;
        gap: 0.875rem;
        font-size: 0.8rem;
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 0.25rem;
        transition: all 0.3s ease;
    }

    .navbar.scrolled .nav-links {
        gap: 0.625rem;
        font-size: 0.7rem;
        margin-top: 0;
    }

    .nav-links a {
        color: rgba(255, 255, 255, 0.85);
        padding: 0.25rem 0;
    }

    .nav-links a::after {
        display: none;
    }

    .nav-links a:hover {
        color: #fff;
        text-decoration: underline;
    }

    .hero {
        padding-top: 150px;
    }

    .hero-content {
        padding: 1rem;
    }

    .hero-logo {
        width: min(280px, 70vw);
        margin-bottom: 1.5rem;
    }

    .hero-tagline {
        font-size: 0.9rem;
        margin-bottom: 1.5rem;
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }

    .btn svg {
        width: 20px;
        height: 20px;
    }

    /* 右下角按钮缩小 */
    .fab-container {
        bottom: 1rem;
        right: 1rem;
        gap: 0.75rem;
    }

    .back-to-top,
    .status-fab-button,
    .fab-button {
        width: 48px;
        height: 48px;
    }

    .back-to-top svg,
    .status-fab-button svg,
    .fab-button svg {
        width: 22px;
        height: 22px;
    }

    .status-popup {
        bottom: 58px;
        width: calc(100vw - 2rem);
        right: -0.5rem;
    }

    .community-popup {
        bottom: 68px;
        width: calc(100vw - 2rem);
        right: -0.5rem;
    }

    /* 歌曲区域调整 */
    .songs {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.75rem;
        margin-bottom: 0.5rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }

    .songs-scroll-container {
        padding: 0 1rem;
    }

    .songs-scroll {
        gap: 1rem;
        padding: 0.75rem 0 1.5rem;
    }

    .song-card {
        flex: 0 0 200px;
    }

    .song-cover {
        aspect-ratio: 1;
    }

    .song-info {
        padding: 1rem;
    }

    .song-title {
        font-size: 1rem;
        margin-bottom: 0.4rem;
    }

    .song-artist {
        font-size: 0.8rem;
        margin-bottom: 0.75rem;
    }

    .song-tag,
    .song-difficulty {
        font-size: 0.7rem;
        padding: 0.2rem 0.6rem;
    }

    .scroll-arrow {
        display: none;
    }

    .footer {
        padding: 2rem 1rem;
    }

    .footer-copyright {
        font-size: 0.8rem;
    }
}

/* 粒子效果背景 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: rise 10s infinite;
}

@keyframes rise {
    0% {
        transform: translateY(100vh) scale(0);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateY(-100vh) scale(1);
        opacity: 0;
    }
}