/* ===================================================
   ** MKK.CSS (最终稳定版 - 完整代码块 - 样式修正) **
   =================================================== */

/* --- RESET & BASE --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* --- MKK THEME (ROCK / DEFAULT) --- */
    --bg-color: #1a0505; 
    --card-bg: #2e0b0b;
    --text-color: #e6e6e6; 
    --accent-color: #ff4d4d; /* 红色/主题色 */
    --monotone-color: #E53935; 
    --shadow-color: rgba(0, 0, 0, 0.5); 
    
    --font-main: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'Space Mono', 'Consolas', monospace;
    --transition-speed: 0.8s;
    --card-width: 300px; 
    --hero-max-height: 80vh; 
    
    /* 滚动条颜色变量 */
    --scroll-thumb-color: var(--accent-color);
    --scroll-track-color: rgba(255, 255, 255, 0.1);
}

/* --- KAI THEME (R&B) --- */
[data-theme="kai"] {
    --bg-color: #050a1a; 
    --card-bg: #0e152e;
    --text-color: #e6f0ff; 
    --accent-color: #4d94ff; /* 蓝色/主题色 */
    --monotone-color: #1E88E5; 
    --shadow-color: rgba(0, 0, 0, 0.5);
    
    --scroll-thumb-color: var(--accent-color);
    --scroll-track-color: rgba(255, 255, 255, 0.1);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    font-weight: 300;
    overflow-x: hidden;
    line-height: 1.4;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

/* --- TYPOGRAPHY etc. --- */
h1, h2, h3 {
    /* 保持网站整体小写风格 */
    text-transform: lowercase; 
    font-weight: 500;
    letter-spacing: -0.02em;
}

p {
    margin-bottom: 1em;
}

/* --- NAVIGATION & SWITCH --- */
.logo {
    font-size: 8vw;
    line-height: 0.8;
    font-weight: 700;
    letter-spacing: -0.05em;
    mix-blend-mode: exclusion;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    pointer-events: none;
    padding: 20px;
    color: #fff;
}

.label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: lowercase; /* 修正为小写 */
    letter-spacing: 0.1em;
    margin-bottom: 15px;
    display: block;
    opacity: 0.6;
    border-left: 1px solid var(--accent-color);
    padding-left: 10px;
}

.persona-switch {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 200;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: rgba(0,0,0,0.3);
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 12px 24px;
    cursor: pointer;
    text-transform: lowercase; /* 修正为小写 */
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
    border-radius: 50px;
    display: flex; /* 启用 flex 以对齐光点 */
    align-items: center;
}

.persona-switch:hover {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

/* 状态光点样式 */
.status-dot {
    height: 8px;
    width: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    margin-right: 12px;
    box-shadow: 0 0 12px var(--accent-color);
    transition: background-color var(--transition-speed);
}

/* --- LAYOUT & SECTIONS --- */
.container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 18vh;
}

.hero {
    width: 100%;
    padding: 0 40px 80px;
    max-height: var(--hero-max-height); 
    overflow: hidden; 
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-content {
    max-width: 1200px;
    width: 100%;
    display: flex;
    gap: 60px;
    align-items: center;
}

.hero-image-container {
    flex-shrink: 0;
    width: 400px; 
    aspect-ratio: 1 / 1;
    overflow: hidden; 
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.5s ease; /* 修正过渡 */
    transform: scale(1);
    transform-origin: center center; 
    filter: grayscale(100%) opacity(0.8); /* 初始低饱和度/灰度 */
}

/* 顶部 Hero 图悬停彩色效果和放大 */
.hero-image:hover { 
    filter: grayscale(0%) opacity(1); 
    transform: scale(1.2); 
    transform-origin: var(--mouse-x, 50%) var(--mouse-y, 50%);
}

.hero-details {
    flex-grow: 1;
    padding-right: 20px;
}
.hero-title {
    font-size: 6vw;
    line-height: 0.9;
    margin-bottom: 20px;
}
.cta-button {
    display: inline-block;
    padding: 12px 30px;
    margin-top: 20px;
    border: 2px solid var(--accent-color);
    background-color: var(--accent-color);
    color: var(--bg-color);
    text-transform: lowercase; /* 修正为小写 */
    font-weight: bold;
    transition: all 0.3s ease;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}
.cta-button:hover {
    background-color: transparent;
    color: var(--accent-color);
}

.bio-section {
    padding: 80px 40px;
}
.bio-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
}
.bio-title {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    text-transform: lowercase; /* 修正为小写 */
    color: var(--accent-color);
}
.bio-text {
    font-size: 1.1rem;
    max-width: 600px;
}
.bio-text strong {
    color: var(--accent-color);
}
footer {
    padding: 20px 40px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    opacity: 0.5;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    text-transform: lowercase; /* 修正为小写 */
}


/* ===================================================
   ** CARD FLOW SECTION STYLES (FLUID COVERFLOW) **
   =================================================== */
.grid-section {
    padding: 80px 0;
    max-width: 100%;
    margin: 0;
    width: 100%;
    position: relative; 
    overflow: hidden; 
}

.grid-header {
    max-width: 1200px;
    margin: 0 auto 40px;
    padding: 0 40px 20px 40px;
    font-family: var(--font-mono);
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    opacity: 0.8;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    text-transform: lowercase; /* 修正为小写 */
}

/* --- 容器 (Coverflow/Snap 核心) --- */
.coverflow-wrapper {
    position: relative; 
    max-width: 1200px; 
    margin: 0 auto; 
    overflow: visible; 
}

.coverflow-container {
    width: 100%;
    padding: 20px 40px; 
    display: flex;
    gap: 40px;
    overflow-x: scroll; 
    -webkit-overflow-scrolling: touch;
    position: relative; 
    cursor: grab; 
    scroll-snap-type: x mandatory; 
}

/* 隐藏滚动条 */
.coverflow-container::-webkit-scrollbar { height: 0; }
.coverflow-container { scrollbar-width: none; }

/* --- 专辑卡牌 Wrapper & 3D 翻转 --- */
.album-card-wrapper {
    flex-shrink: 0; 
    min-width: var(--card-width); 
    max-width: var(--card-width);
    height: 480px;
    perspective: 1000px; 
    transition: all 0.3s ease-out; /* 为漂浮效果添加过渡 */
}

/* 悬浮放大漂浮效果 */
.album-card-wrapper:hover { 
    z-index: 10; 
    transform: scale(1.15) translateY(-5px); 
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7); 
}

.album-card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease-in-out;
    cursor: pointer;
    border-radius: 12px;
    background-color: var(--card-bg);
    box-shadow: 0 10px 30px var(--shadow-color); 
}
.album-card.flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    padding: 25px 25px 70px 25px; 
    box-sizing: border-box;
    background-color: var(--card-bg);
    color: var(--text-color);
    display: flex; 
    flex-direction: column;
}

.card-back { transform: rotateY(180deg); text-align: left; justify-content: flex-start; }
.back-details { padding-top: 15px; flex-grow: 1; min-height: 0; display: flex; flex-direction: column; height: 100%; }
.description-scroller { flex-grow: 1; min-height: 0; max-height: 100%; overflow-y: auto; padding-right: 15px; touch-action: pan-y; }
.tracklist-scroller { flex-shrink: 0; flex-grow: 0; min-height: 0; max-height: 180px; overflow-y: auto; margin-top: 0; width: 100%; padding-right: 15px;}
.description-half { max-height: 50% !important; flex-shrink: 1 !important; }
.tracklist-half { max-height: 50% !important; flex-shrink: 1 !important; margin-top: 20px !important; }

.back-date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent-color); opacity: 0.6; margin-bottom: 5px; }

/* 滚动条样式 */
.description-scroller::-webkit-scrollbar,
.tracklist-scroller::-webkit-scrollbar { width: 8px; }
.description-scroller::-webkit-scrollbar-thumb,
.tracklist-scroller::-webkit-scrollbar-thumb { background-color: var(--scroll-thumb-color); border-radius: 4px; }
.description-scroller::-webkit-scrollbar-track,
.tracklist-scroller::-webkit-scrollbar-track { background: var(--scroll-track-color); border-radius: 4px; }

.back-description { font-size: 0.95rem; line-height: 1.6; margin-bottom: 0; }
.tracklist-title { font-family: var(--font-mono); font-size: 1rem; color: var(--accent-color); margin-top: 20px; margin-bottom: 10px; text-transform: lowercase; } /* 修正为小写 */
.tracklist { list-style: none; padding-left: 0; font-size: 0.85rem; line-height: 1.7; }

/* --- 卡牌正面 (Monotone 效果和放大 2 倍) --- */
.card-front {
    align-items: center;
    text-align: center;
    justify-content: space-between; 
}

.album-cover {
    width: 100%;
    aspect-ratio: 1 / 1; 
    margin-bottom: 15px;
    border-radius: 6px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);

    /* 放大功能核心：环境设置 */
    transform-style: preserve-3d;
    overflow: hidden; 
    position: relative; 
    cursor: pointer;
}

/* 灰度/Monotone 效果 */
.album-cover img {
    display: block; 
    width: 100%;
    height: 100%; 
    object-fit: cover;
    transition: filter 0.8s ease, transform 0.1s ease-out; 
    transform: scale(1);
    transform-origin: center center;
}

.album-cover::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--monotone-color); 
    opacity: 0.5; 
    mix-blend-mode: multiply;
    transition: opacity 0.8s ease, background-color var(--transition-speed);
    z-index: 2;
}

/* 悬停效果：彩色渐变 + 放大 2 倍 */
.album-card-wrapper:hover .album-cover::before {
    opacity: 0;
}

.album-card-wrapper:hover .album-cover img {
    filter: grayscale(0%); 
    /* 核心：放大 2 倍 */
    transform: scale(1.7); 
    /* 确保使用 JS 变量跟随鼠标 */
    transform-origin: var(--mouse-x, 50%) var(--mouse-y, 50%);
}

/* --- Type 文本样式 --- */
.album-title { font-size: 1.4rem; font-weight: bold; line-height: 1.1; margin-bottom: 5px; text-transform: lowercase; } /* 修正为小写 */
.album-type { 
    font-size: 0.85rem; 
    color: var(--accent-color); 
    text-transform: lowercase; /* 修正为小写 */
    font-family: var(--font-mono); 
    margin-bottom: 15px; 
}
/* --- Spotify 链接文本样式 --- */
.spotify-link {
    display: inline-block;
    padding: 8px 20px;
    margin-top: 10px;
    border: 1px solid var(--accent-color);
    background-color: transparent;
    color: var(--accent-color);
    text-transform: lowercase; /* 修正为小写 */
    font-weight: bold;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    border-radius: 4px;
}
.spotify-link:hover {
    background-color: var(--accent-color);
    color: var(--bg-color); 
}

.album-card-wrapper:hover .spotify-link { background-color: var(--accent-color); color: var(--bg-color); }

/* --- 翻转指示器文本 (DETAILS/RETURN) --- */
.flip-indicator {
    position: absolute;
    bottom: 0; 
    right: 0;
    left: 0;
    text-align: right; 
    width: 100%;
    padding: 10px 15px 10px 25px; 
    border-top: 1px dashed rgba(255, 255, 255, 0.1); 
    background-color: var(--card-bg); 
    
    font-size: 0.7rem; 
    font-family: var(--font-mono);
    text-transform: lowercase; /* 修正为小写 */
    color: var(--text-color);
    opacity: 0.4; 
    transition: color 0.3s, opacity 0.3s;
    z-index: 15; 
}

.album-card-wrapper:hover .flip-indicator {
    color: var(--accent-color);
    opacity: 1;
}

/* ----------------------------------------------------
   --- 导航按钮样式 (修正：无背景，Accent 箭头，内部定位) ---
   ---------------------------------------------------- */
.card-nav-btn {
    pointer-events: auto; 
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    
    /* 样式修正：无背景，Accent 箭头 */
    background: none; /* 移除背景色 */
    color: var(--accent-color); /* 箭头颜色跟随主题色 (Accent) */
    border: none; 
    width: 40px; 
    height: 60px; 
    /* 恢复 font-size 和 font-weight 使箭头更细/更锐利 */
    font-size: 1.5rem; 
    font-weight: 900; 
    
    cursor: pointer;
    opacity: 0.9;
    transition: all 0.3s ease;
    z-index: 50; 
    display: none; /* 默认隐藏，由 JS 根据卡片数量决定显示 */
    justify-content: center;
    align-items: center;
}

/* 🎯 最终稳定定位：固定到 Wrapper 内部，使用 Margin 推入 30px */
#nav-left { 
    left: 0; 
    margin-left: 30px; /* 正数 30px，位于内部 */
} 
#nav-right { 
    right: 0; 
    margin-right: 30px; /* 正数 30px，位于内部 */
} 

.card-nav-btn:hover {
    opacity: 1;
    transform: translateY(-50%) scale(1.2); /* 悬停时增大箭头 */
}

/* 确保细箭头字符显示，使用 \25C0 和 \25B6 */
#nav-left::before {
    content: '\25C0'; /* 左向实心三角形 */
    display: block; 
}
#nav-right::before {
    content: '\25B6'; /* 右向实心三角形 */
    display: block;
}

/* --- RESPONSIVE 修正 --- */
@media (max-width: 768px) {
    /* ... 移动端样式保持不变 ... */
    .logo { font-size: 14vw; position: relative; padding: 20px; margin-bottom: -20px;}
    .container { padding-top: 0; }
    .hero-title { font-size: 14vw; }
    .hero { padding: 0 20px 40px; }
    .hero-content { flex-direction: column; gap: 30px; }
    .hero-image-container { width: 100%; max-width: 300px; }
    .hero-details { padding-right: 0; text-align: center; }
    .bio-container { grid-template-columns: 1fr; padding: 0 20px; }
    .bio-title { text-align: center; }
    .bio-text { max-width: 100%; }

    .coverflow-container {
        gap: 20px;
        padding: 20px 20px;
    }
    
    /* 移动端恢复默认滚动行为 */
    .description-scroller,
    .tracklist-scroller {
        max-height: none; 
        overflow-y: visible;
    }
    :root {
        --card-width: 280px; 
        --hero-max-height: 100vh;
    }
}