/* --- 基本設定とデザイン変数 --- */
:root {
    --dm-glow-color: #D4AF37;
    --dm-glow-color-transparent: rgba(212, 175, 55, 0.7);
    --dm-font-elegant: 'Cormorant Garamond', serif;
    --dm-font-modern: 'Inter', 'Noto Sans JP', sans-serif;
    --dm-font-size-h1: clamp(3.5rem, 10vw, 5.5rem);
    --dm-font-size-subtitle: clamp(0.9rem, 2.5vw, 1rem);
    --dm-font-size-now-playing: 1.5rem;
    --dm-font-size-card-title: 0.9rem;
}

/* --- 全体コンテナと背景 --- */
.dm-container {
    font-family: var(--dm-font-modern);
    width: 100%;
    max-width: 800px;
    padding: 40px 20px;
    box-sizing: border-box;
    color: #e8e6e3;
}
.dm-background-aurora {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(ellipse at 20% 80%, rgba(88, 76, 21, 0.15), transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(44, 62, 80, 0.15), transparent 50%);
    animation: dm-aurora 25s infinite alternate;
    z-index: -1;
}
@keyframes dm-aurora {
    0% { transform: rotate(0deg) scale(1.5); }
    100% { transform: rotate(360deg) scale(2.2); }
}

/* --- ヘッダー --- */
.dm-header { text-align: center; margin-bottom: 40px; }
.dm-header h1 { 
    font-family: var(--dm-font-elegant);
    font-size: var(--dm-font-size-h1);
    color: #fff;
    font-weight: 700;
    letter-spacing: 3px;
    text-shadow: 0 0 7px #fff, 0 0 12px var(--dm-glow-color), 0 0 25px var(--dm-glow-color), 0 0 40px var(--dm-glow-color-transparent);
    margin: 0;
    animation: dm-pulse 5s infinite alternate;
}
@keyframes dm-pulse {
    from { text-shadow: 0 0 7px #fff, 0 0 12px var(--dm-glow-color), 0 0 25px var(--dm-glow-color); }
    to { text-shadow: 0 0 7px #fff, 0 0 20px var(--dm-glow-color), 0 0 45px var(--dm-glow-color); }
}
.dm-header p {
    font-family: var(--dm-font-modern);
    font-size: var(--dm-font-size-subtitle);
    color: #a0a0a0;
    letter-spacing: 1px;
    margin-top: 0.2em;
    opacity: 0.8;
}

/* --- 波形 --- */
.dm-waveform { 
    width: 100%; 
    height: 120px; 
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-bottom: 30px;
    backdrop-filter: blur(5px);
}

/* --- プレイヤー情報エリア --- */
.dm-player-info {
    visibility: hidden;
    opacity: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-bottom: 0;
    overflow: hidden;
    transition: all 0.5s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.dm-player-info.visible {
    visibility: visible;
    opacity: 1;
    max-height: 300px;
    padding-top: 25px;
    padding-bottom: 25px;
    margin-bottom: 40px;
}
.dm-now-playing {
    font-family: var(--dm-font-elegant);
    font-size: var(--dm-font-size-now-playing);
    color: var(--dm-glow-color);
    margin: 0 0 20px 0;
    min-height: 1.5em;
}
.dm-seek-bar {
    width: 90%;
    max-width: 500px;
    accent-color: var(--dm-glow-color);
    margin-bottom: 25px;
}
.dm-stop-button {
    background: transparent;
    border: 1px solid rgba(212, 175, 55, 0.5);
    color: var(--dm-glow-color);
    padding: 12px 40px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    backdrop-filter: blur(2px);
}
.dm-stop-button:hover {
    background: var(--dm-glow-color);
    color: #0a0a0a;
    box-shadow: 0 0 25px var(--dm-glow-color-transparent);
}

/* --- プレイリストカード --- */
.dm-playlist-controls { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); 
    gap: 20px; 
}
.dm-playlist-card { 
    position: relative;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 10px; 
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px;
    text-align: center;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    cursor: pointer;
}
.dm-playlist-card:hover {
    transform: translateY(-5px);
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--dm-glow-color-transparent);
}
.dm-playlist-card.active {
    background: rgba(212, 175, 55, 0.2);
    border-color: var(--dm-glow-color);
    box-shadow: 0 0 20px var(--dm-glow-color-transparent);
}
.dm-card-icon-container {
    height: 48px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.dm-card-icon-container svg {
    width: 40px; height: 40px;
    stroke: #a0a0a0;
    stroke-width: 1.2;
    fill: none;
    transition: all 0.3s ease;
}
.dm-playlist-card:hover .dm-card-icon-container svg,
.dm-playlist-card.active .dm-card-icon-container svg {
    stroke: var(--dm-glow-color);
}
.dm-card-title {
    font-family: var(--dm-font-modern);
    font-size: var(--dm-font-size-card-title);
    font-weight: 400;
    color: #ccc;
    text-shadow: none;
    line-height: 1.5;
}