*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:#172a2d;color:white;font-family:Arial,Helvetica,sans-serif;overflow-x:hidden}

/* BACKGROUND */
.background-layer{position:fixed;z-index:-3;inset:-120px;background:radial-gradient(circle at top,#35585d,#20383c 45%,#172a2d);background-position:center;background-size:cover;background-repeat:no-repeat;filter:blur(100px) saturate(1.35);transform:scale(1.18);opacity:0;transition:opacity .9s ease}
.background-layer.active{opacity:1}
.background-layer.no-blur{filter:none;transform:scale(1)}
.background-darkener{position:fixed;z-index:-2;inset:0;pointer-events:none;background:linear-gradient(to bottom,rgba(10,18,20,.25),rgba(10,18,20,.58))}

/* PLAYER */
.player{position:relative;z-index:1;width:min(520px,90%);margin:auto;padding:70px 0 100px}
.now-playing{text-align:center}
.playlist-label{margin-bottom:5px;font-size:10px;letter-spacing:3px;opacity:.5}
.now-playing h2{margin-top:0;margin-bottom:45px;font-size:15px;font-weight:normal}

/* JACKET */
.jacket{position:relative;width:100%;aspect-ratio:1/1;overflow:hidden;border:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.15);box-shadow:0 30px 80px rgba(0,0,0,.3)}
.jacket img{display:none;width:100%;height:100%;object-fit:cover}
#jacketPlaceholder{position:absolute;inset:0;display:flex;justify-content:center;align-items:center;font-size:12px;letter-spacing:3px;opacity:.25}

/* SONG INFO */
#songTitle{margin-top:35px;margin-bottom:5px;font-size:22px}
#artistName{margin-top:0;font-size:14px;opacity:.6}

/* WAVEFORM */
.waveform{width:100%;height:72px;margin-top:28px;display:flex;align-items:center;gap:3px;overflow:hidden;cursor:pointer;user-select:none;touch-action:none}
.wave-bar{flex:1;min-width:2px;border-radius:999px;background:rgba(255,255,255,.18);opacity:.65;transition:background .12s ease,opacity .12s ease,transform .12s ease}
.wave-bar.played{background:rgba(255,255,255,.95);opacity:1}
.wave-bar.current{background:white;opacity:1;transform:scaleY(1.08)}
.waveform.empty-waveform{opacity:.2;cursor:default}
.waveform-time{display:flex;justify-content:space-between;margin-top:1px;font-size:10px;opacity:.55}

/* PROGRESS */
.progress{width:100%;height:12px;margin-top:7px;display:flex;align-items:center}
.progress input{width:100%;height:2px;margin:0;cursor:pointer;accent-color:white;opacity:.35}

/* CONTROLS */
.controls{display:flex;justify-content:center;align-items:center;gap:50px;margin-top:27px}
.controls button{border:none;background:none;color:white;font-size:22px;cursor:pointer;opacity:.8;transition:transform .2s,opacity .2s}
.controls button:hover{opacity:1;transform:scale(1.08)}
.controls .play{width:70px;height:70px;border:1px solid rgba(255,255,255,.8);border-radius:50%;background:rgba(0,0,0,.05);backdrop-filter:blur(10px);font-size:25px}

/* PLAY OPTIONS */
.play-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:32px}
.option-button{display:flex;justify-content:center;align-items:center;gap:8px;min-height:42px;border:1px solid rgba(255,255,255,.14);border-radius:999px;background:rgba(0,0,0,.07);color:white;cursor:pointer;opacity:.55;transition:opacity .2s,background .2s,border-color .2s,transform .2s}
.option-button:hover{opacity:.9;transform:translateY(-1px)}
.option-button.active{opacity:1;border-color:rgba(255,255,255,.55);background:rgba(255,255,255,.12)}
.option-icon{font-size:17px}
.option-button span:last-child{font-size:9px;letter-spacing:1px}

/* VOLUME */
.volume-control{display:grid;grid-template-columns:34px 1fr 42px;align-items:center;gap:10px;margin-top:18px;padding:10px 12px;border:1px solid rgba(255,255,255,.1);border-radius:999px;background:rgba(0,0,0,.06)}
.volume-icon{padding:0;border:none;background:none;color:white;font-size:15px;cursor:pointer}
#volumeSlider{width:100%;cursor:pointer;accent-color:white}
#volumeValue{text-align:right;font-size:9px;opacity:.55}

/* YOUTUBE */
.youtube-source{width:100%;margin-top:35px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1)}
.youtube-source-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:9px;letter-spacing:2px;opacity:.45}
.youtube-source-header strong{font-size:9px;font-weight:normal}
.youtube-player-container{width:100%;aspect-ratio:16/9;overflow:hidden;border:1px solid rgba(255,255,255,.1);border-radius:10px;background:black;box-shadow:0 20px 45px rgba(0,0,0,.18)}
#youtubePlayer,#youtubePlayer iframe{display:block;width:100%;height:100%}

/* PLAYLIST */
.playlist-section{margin-top:80px;padding-top:30px;border-top:1px solid rgba(255,255,255,.15)}
.playlist-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.playlist-header h3{font-size:12px;letter-spacing:3px}
#openAddSong{padding:9px 15px;border:1px solid rgba(255,255,255,.3);border-radius:20px;background:rgba(0,0,0,.05);color:white;font-size:10px;letter-spacing:1px;cursor:pointer}
.empty-message{padding:30px;text-align:center;font-size:12px;opacity:.3}

/* SONG ITEM */
.song-item{display:flex;align-items:center;gap:12px;padding:12px;border-radius:8px;cursor:pointer;transition:background .2s,transform .2s}
.song-item:hover{background:rgba(255,255,255,.08);transform:translateX(3px)}
.song-item.active{background:rgba(255,255,255,.12);backdrop-filter:blur(10px)}
.song-number{width:25px;flex-shrink:0;font-size:11px;opacity:.35}
.song-thumbnail,.song-thumbnail-placeholder{width:50px;height:50px;flex-shrink:0}
.song-thumbnail{object-fit:cover}
.song-thumbnail-placeholder{display:flex;justify-content:center;align-items:center;background:rgba(0,0,0,.2);font-size:8px;opacity:.4}
.song-info{flex:1;min-width:0}
.song-info h4{margin:0 0 5px;overflow:hidden;font-size:13px;white-space:nowrap;text-overflow:ellipsis}
.song-info p{margin:0;overflow:hidden;font-size:11px;white-space:nowrap;text-overflow:ellipsis;opacity:.45}

/* SONG ACTIONS */
.song-actions{display:flex;align-items:center;gap:2px;flex-shrink:0}
.edit-song-button,.delete-song-button{width:32px;height:32px;border:none;border-radius:50%;background:transparent;color:white;cursor:pointer;opacity:0;font-size:18px;transition:opacity .2s,background .2s}
.song-item:hover .edit-song-button,.song-item:hover .delete-song-button{opacity:.45}
.edit-song-button:hover,.delete-song-button:hover{opacity:1!important;background:rgba(255,255,255,.1)}

/* MODAL */
.modal-background{position:fixed;z-index:1000;inset:0;display:flex;justify-content:center;align-items:center;padding:20px;background:rgba(5,15,17,.65);backdrop-filter:blur(18px)}
.hidden{display:none!important}
.modal{position:relative;width:min(430px,100%);max-height:90vh;overflow-y:auto;padding:40px;border:1px solid rgba(255,255,255,.15);border-radius:15px;background:rgba(36,63,67,.92);backdrop-filter:blur(25px);box-shadow:0 30px 80px rgba(0,0,0,.4)}
.modal-label{margin-bottom:5px;font-size:9px;letter-spacing:3px;opacity:.4}
.modal h2{margin-top:0;margin-bottom:25px}
.modal label{display:block;margin-top:20px;font-size:11px;opacity:.8}
.modal input[type="text"]{width:100%;margin-top:8px;padding:12px;border:1px solid rgba(255,255,255,.15);border-radius:6px;outline:none;background:rgba(0,0,0,.15);color:white}
.modal input[type="file"]{width:100%;margin-top:10px;color:white}
.close-button{position:absolute;top:15px;right:20px;border:none;background:none;color:white;font-size:25px;cursor:pointer;opacity:.5}
.main-button{width:100%;margin-top:30px;padding:13px;border:1px solid rgba(255,255,255,.5);border-radius:30px;background:white;color:#20383c;font-weight:bold;cursor:pointer}

/* BACKGROUND EDITOR */
.editing-song-name{margin-top:-15px;margin-bottom:30px;font-size:12px;opacity:.45}
.background-type-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}
.background-type-button{padding:11px 6px;border:1px solid rgba(255,255,255,.16);border-radius:7px;background:rgba(0,0,0,.08);color:white;font-size:9px;cursor:pointer;opacity:.55}
.background-type-button.active{border-color:rgba(255,255,255,.65);background:rgba(255,255,255,.12);opacity:1}
.background-settings{margin-top:25px}
.color-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.modal input[type="color"]{display:block;width:100%;height:50px;margin-top:10px;padding:4px;border:1px solid rgba(255,255,255,.15);border-radius:8px;background:rgba(0,0,0,.15);cursor:pointer}
.background-preview{position:relative;height:130px;margin-top:28px;overflow:hidden;border:1px solid rgba(255,255,255,.15);border-radius:10px;background:#20383c;background-position:center;background-size:cover}
.background-preview::after{content:"PREVIEW";position:absolute;left:15px;bottom:12px;font-size:9px;letter-spacing:2px;opacity:.5}

/* VER.0.8 PLAYLIST EDITOR */
.playlist-title-row{display:flex;justify-content:center;align-items:center;gap:8px;margin-bottom:45px}
.playlist-title-row h2{margin:0}
.tiny-edit-button{width:28px;height:28px;border:1px solid rgba(255,255,255,.14);border-radius:50%;background:rgba(0,0,0,.06);color:white;cursor:pointer;opacity:.45;transition:.2s}
.tiny-edit-button:hover{opacity:1;background:rgba(255,255,255,.1);transform:translateY(-1px)}
.drag-help{margin:-10px 0 12px;font-size:9px;letter-spacing:1px;opacity:.3}
.drag-handle{width:22px;flex-shrink:0;font-size:18px;line-height:1;text-align:center;cursor:grab;opacity:.28;user-select:none;touch-action:none}
.drag-handle:active{cursor:grabbing}
.song-item.dragging{opacity:.35;transform:scale(.985)}
.song-item.drag-over{outline:1px solid rgba(255,255,255,.55);background:rgba(255,255,255,.12)}
.small-modal{width:min(390px,100%)}
.track-editor-modal{width:min(470px,100%)}
.editor-section{margin-top:28px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1)}
.editor-section-title{margin:0 0 12px;font-size:9px;letter-spacing:2px;opacity:.42}
.edit-jacket-preview{position:relative;width:110px;height:110px;margin:12px 0 4px;overflow:hidden;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.14);border-radius:8px;background:rgba(0,0,0,.12)}
.edit-jacket-preview img{display:none;width:100%;height:100%;object-fit:cover}
.edit-jacket-preview span{font-size:8px;letter-spacing:1px;opacity:.3}
.secondary-button{width:100%;margin-top:12px;padding:10px;border:1px solid rgba(255,255,255,.16);border-radius:999px;background:rgba(0,0,0,.08);color:white;font-size:9px;letter-spacing:1px;cursor:pointer;opacity:.65}
.secondary-button:hover{opacity:1;background:rgba(255,255,255,.08)}

/* VER.0.9 EXPORT / IMPORT */
.playlist-header-actions{display:flex;align-items:center;justify-content:flex-end;gap:7px;flex-wrap:wrap}
.playlist-tool-button{padding:9px 12px;border:1px solid rgba(255,255,255,.22);border-radius:20px;background:rgba(0,0,0,.05);color:white;font-size:9px;letter-spacing:1px;cursor:pointer;opacity:.65;transition:opacity .2s,background .2s,transform .2s}
.playlist-tool-button:hover{opacity:1;background:rgba(255,255,255,.1);transform:translateY(-1px)}

/* ==========================================
   VER.1.0 MULTI PLAYLIST LIBRARY
========================================== */

.playlist-library{
    width:100%;
    margin-bottom:58px;
    padding:20px;
    border:1px solid rgba(255,255,255,.12);
    border-radius:14px;
    background:rgba(0,0,0,.08);
    backdrop-filter:blur(14px)
}

.library-header{
    display:flex;
    justify-content:space-between;
    align-items:flex-end;
    gap:16px;
    margin-bottom:16px
}

.library-label{
    margin:0 0 6px;
    font-size:9px;
    letter-spacing:2px;
    opacity:.4
}

.library-header h2{
    margin:0;
    font-size:14px;
    font-weight:normal;
    letter-spacing:3px
}

.create-playlist-button{
    padding:10px 14px;
    border:1px solid rgba(255,255,255,.24);
    border-radius:999px;
    background:rgba(255,255,255,.08);
    color:white;
    font-size:9px;
    letter-spacing:1px;
    cursor:pointer;
    transition:background .2s,transform .2s,opacity .2s
}

.create-playlist-button:hover{
    background:rgba(255,255,255,.14);
    transform:translateY(-1px)
}

.playlist-library-list{
    display:flex;
    gap:8px;
    overflow-x:auto;
    padding:2px 0 8px;
    scrollbar-width:thin
}

.playlist-library-card{
    min-width:150px;
    max-width:220px;
    padding:12px 14px;
    border:1px solid rgba(255,255,255,.12);
    border-radius:10px;
    background:rgba(0,0,0,.08);
    color:white;
    text-align:left;
    cursor:pointer;
    opacity:.58;
    transition:opacity .2s,transform .2s,background .2s,border-color .2s
}

.playlist-library-card:hover{
    opacity:.9;
    transform:translateY(-1px);
    background:rgba(255,255,255,.08)
}

.playlist-library-card.active{
    opacity:1;
    border-color:rgba(255,255,255,.5);
    background:rgba(255,255,255,.12)
}

.playlist-library-card-name{
    display:block;
    overflow:hidden;
    white-space:nowrap;
    text-overflow:ellipsis;
    font-size:11px
}

.playlist-library-card-count{
    display:block;
    margin-top:6px;
    font-size:8px;
    letter-spacing:1px;
    opacity:.45
}

.playlist-header-title{
    display:flex;
    align-items:baseline;
    gap:9px
}

.playlist-track-count{
    font-size:8px;
    letter-spacing:1px;
    opacity:.35;
    white-space:nowrap
}

.danger-button{
    border-color:rgba(255,180,180,.22)
}

.danger-button:hover{
    background:rgba(255,120,120,.10)
}

.danger-button:disabled{
    opacity:.2;
    cursor:not-allowed;
    transform:none
}

/* ジャケット編集画面のNO IMAGE重なり対策 */
.edit-jacket-preview:not(.no-image) span{
    display:none
}

.edit-jacket-preview.no-image span{
    display:block
}

/* MOBILE */
@media(max-width:600px){

    .player{
        width:90%;
        padding-top:40px
    }

    .controls{
        gap:35px
    }

    .modal{
        padding:35px 25px
    }

    .edit-song-button,
    .delete-song-button{
        opacity:.4
    }

    .background-type-buttons{
        grid-template-columns:1fr
    }

    .waveform{
        gap:2px;
        height:62px
    }

    .play-options{
        gap:7px
    }

    .drag-help{
        text-align:center
    }

    .drag-handle{
        opacity:.5
    }

    .playlist-library{
        padding:16px;
        margin-bottom:42px
    }

    .library-header{
        align-items:flex-start;
        flex-direction:column
    }

    .playlist-library-list{
        margin-right:-16px
    }

    .playlist-library-card{
        min-width:135px
    }

    .playlist-header{
        align-items:flex-start;
        flex-direction:column;
        gap:14px
    }

    .playlist-header-actions{
        max-width:none;
        justify-content:flex-start
    }
}

/* ==========================================
   VER.1.1 SHARE PLAYLIST
========================================== */
.share-button{border-color:rgba(180,235,255,.42);background:rgba(180,235,255,.09);opacity:.9}
.share-button:hover{background:rgba(180,235,255,.16)}
.share-modal{width:min(480px,100%)}
.share-description{margin:-10px 0 20px;font-size:11px;line-height:1.8;opacity:.6}
.share-url-area{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}
.share-url-area input[type="text"]{min-width:0;margin:0;padding:12px;border:1px solid rgba(255,255,255,.15);border-radius:8px;outline:none;background:rgba(0,0,0,.16);color:white;font-size:10px}
.share-copy-button{width:auto;min-width:110px;margin:0;padding:12px 16px}
.shared-playlist-preview{margin-top:8px}
.shared-preview-header{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.12)}
#sharedPlaylistName{overflow:hidden;font-size:15px;white-space:nowrap;text-overflow:ellipsis}
#sharedPlaylistCount{flex-shrink:0;font-size:8px;letter-spacing:1px;opacity:.4}
.shared-track-list{max-height:280px;overflow-y:auto;margin-top:8px}
.shared-track-item{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:10px 4px;border-bottom:1px solid rgba(255,255,255,.07)}
.shared-track-number{font-size:9px;opacity:.3}
.shared-track-info{min-width:0}
.shared-track-info strong,.shared-track-info span{display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.shared-track-info strong{font-size:11px;font-weight:normal}
.shared-track-info span{margin-top:4px;font-size:9px;opacity:.4}
.browser-warning{margin:24px 0 0;padding:12px 14px;border:1px solid rgba(255,255,255,.1);border-radius:8px;background:rgba(0,0,0,.08);font-size:9px;line-height:1.7;opacity:.65}
.share-note{margin:10px 2px 0;font-size:8px;line-height:1.6;opacity:.35}
@media(max-width:600px){.share-url-area{grid-template-columns:1fr}.share-copy-button{width:100%}.shared-track-list{max-height:240px}}


/* ==========================================
   VER.1.2 CLOUD SHARE
========================================== */
.shared-track-item{grid-template-columns:28px 38px 1fr;align-items:center}
.shared-track-jacket{width:38px;height:38px;object-fit:cover;border-radius:5px;background:rgba(0,0,0,.16)}
.shared-track-jacket-placeholder{display:flex;align-items:center;justify-content:center;font-size:10px;opacity:.3}
#sharePlaylistButton:disabled{cursor:wait;opacity:.45}