* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, sans-serif; }

:root {
    --bg-main: #0f172a;       
    --bg-panel: #1e293b;      
    --accent-blue: #38bdf8;    
    --text-bright: #f8fafc;    
    --text-muted: #94a3b8;     
    --border-color: #334155;   
}

::-webkit-scrollbar { height: 6px; width: 6px; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

#app-container { display: flex; width: 100vw; height: 100vh; background-color: var(--bg-main); color: var(--text-bright); overflow: hidden; }
/* #sidebar { width: 320px; background-color: var(--bg-panel); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; padding: 20px; } */

#sidebar { 
    width: 320px; 
    background-color: var(--bg-panel); 
    border-right: 1px solid var(--border-color); 
    display: flex; 
    flex-direction: column; 
    /* CHANGED: Pushes top group and bottom auth panel to opposite edges */
    justify-content: space-between; 
    padding: 20px; 
}

/* Wraps the list elements so they scroll independently without pushing the footer down */
.sidebar-top-group {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    max-height: calc(100% - 110px);
}

/* NEW: Beautiful Bottom Anchor Profile Component */
#sidebar-auth-panel {
    border-top: 1px solid var(--border-color);
    padding-top: 18px;
    margin-top: 15px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background-color: var(--bg-panel);
}

.user-profile-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

#user-avatar-badge {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.1rem;
    overflow: hidden;
}

#user-avatar-badge img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info-text {
    display: flex;
    flex-direction: column;
    max-width: 200px;
}

#user-display-name {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-bright);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#user-cloud-status {
    font-size: 0.78rem;
    color: var(--text-muted);
}

#sidebar-sync-btn {
    width: 100%;
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    padding: 8px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

#sidebar-sync-btn:hover {
    background-color: rgba(56, 189, 248, 0.08);
    transform: translateY(-1px);
}

#video-viewport { flex-grow: 1; display: flex; flex-direction: column; padding: 30px; overflow-y: auto; }

.sidebar-header h2 { font-size: 1.4rem; color: var(--text-bright); }
#guest-counter { font-size: 0.85rem; color: var(--text-muted); margin-top: 5px; margin-bottom: 20px; }

.playlist-form { display: flex; gap: 8px; margin-bottom: 25px; }
.playlist-form input { flex-grow: 1; padding: 8px 12px; background-color: var(--bg-main); border: 1px solid var(--border-color); border-radius: 6px; color: var(--text-bright); outline: none; }
.playlist-form input:focus { border-color: var(--accent-blue); }
.playlist-form button { padding: 8px 14px; background-color: var(--accent-blue); border: none; border-radius: 6px; color: var(--bg-main); font-weight: 600; cursor: pointer; }

#sidebar-list { display: flex; flex-direction: column; gap: 10px; overflow-y: auto; }
.folder-item { display: flex; justify-content: space-between; align-items: center; padding: 12px; background-color: rgba(255, 255, 255, 0.03); border-radius: 8px; cursor: pointer; transition: all 0.2s ease; }
.folder-item:hover { background-color: rgba(255, 255, 255, 0.08); }
.folder-item.active { background-color: rgba(56, 189, 248, 0.15); border: 1px solid var(--accent-blue); color: var(--accent-blue); }
.folder-name-text { flex-grow: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.folder-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: grab; /* Shows the user they can drag it */
}

.folder-item:active {
    cursor: grabbing;
}

.folder-actions {
    display: flex;
    gap: 8px;
}

.edit-folder-btn, .delete-folder-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    transition: color 0.2s;
}

.edit-folder-btn:hover { color: var(--accent-blue); }
.delete-folder-btn:hover { color: #ef4444; }

/* Drag and Drop visual feedback */
.folder-item.drag-over {
    border-top: 2px solid var(--accent-blue);
}

#learning-status-banner { background-color: rgba(255, 255, 255, 0.03); border-left: 4px solid var(--accent-blue); padding: 12px; border-radius: 4px; margin-bottom: 25px; font-size: 0.9rem; }
#player-workspace { display: flex; flex-direction: column; margin-bottom: 30px; }
.player-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; min-height: 38px; }
#current-video-title { font-size: 1.1rem; color: var(--text-bright); font-weight: 600; margin: 0; padding-right: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 70%; }
#close-video-btn { display: none; background-color: rgba(239, 68, 68, 0.15); color: #ef4444; border: 1px solid #ef4444; padding: 6px 14px; border-radius: 6px; font-weight: 600; cursor: pointer; transition: all 0.2s; }
#close-video-btn:hover { background-color: #ef4444; color: white; }

#video-canvas { width: 100%; aspect-ratio: 16/9; background-color: #000000; border-radius: 12px; overflow: hidden; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3); }
#video-frame-placeholder { width: 100%; height: 100%; display: flex; justify-content: center; align-items: center; color: var(--text-muted); }

.player-nav-controls { display: flex; justify-content: space-between; margin-top: 12px; gap: 15px; }
.player-nav-controls button { flex: 1; padding: 10px; background-color: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-bright); font-weight: 600; cursor: pointer; transition: all 0.2s ease; }
.player-nav-controls button:hover { border-color: var(--accent-blue); background-color: rgba(56, 189, 248, 0.05); }

#notes-workspace-container { background-color: var(--bg-panel); padding: 20px; border-radius: 12px; border: 1px solid var(--border-color); margin-bottom: 25px; }
#notes-workspace-container h3 { margin-bottom: 15px; font-size: 1.1rem; color: var(--text-muted); }
.notes-input-area { display: flex; flex-direction: column; gap: 12px; margin-bottom: 15px; }
#note-textarea { width: 100%; height: 100px; padding: 12px; background-color: var(--bg-main); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-bright); font-size: 0.95rem; font-family: inherit; resize: none; outline: none; }
#note-textarea:focus { border-color: var(--accent-blue); }
.notes-control-actions { display: flex; gap: 12px; justify-content: flex-start; }
#timestamp-btn { background-color: transparent; border: 1px solid var(--accent-blue); color: var(--accent-blue); padding: 8px 16px; border-radius: 6px; font-weight: 600; cursor: pointer; }
#timestamp-btn:hover { background-color: rgba(56, 189, 248, 0.1); }
#save-note-btn { background-color: var(--accent-blue); border: none; color: var(--bg-main); padding: 8px 20px; border-radius: 6px; font-weight: 600; cursor: pointer; }

#saved-notes-list { margin-top: 20px; display: flex; flex-direction: column; gap: 12px; max-height: 250px; overflow-y: auto; padding-right: 5px; }
.note-item { background-color: var(--bg-main); border: 1px solid var(--border-color); padding: 12px; border-radius: 8px; display: flex; align-items: flex-start; gap: 12px; }
.note-timestamp { background-color: rgba(56, 189, 248, 0.1); color: var(--accent-blue); padding: 2px 6px; border-radius: 4px; font-size: 0.85rem; font-weight: 600; cursor: pointer; }
.note-timestamp:hover { background-color: var(--accent-blue); color: var(--bg-main); }
.note-text { font-size: 0.9rem; color: var(--text-bright); line-height: 1.4; flex-grow: 1; white-space: pre-wrap; word-break: break-word; }

.video-import-form { display: flex; gap: 12px; margin-bottom: 25px; }
.video-import-form input { flex-grow: 1; padding: 12px 16px; background-color: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-bright); font-size: 0.95rem; outline: none; }
.video-import-form input:focus { border-color: var(--accent-blue); }
.video-import-form button { padding: 12px 24px; background-color: var(--accent-blue); color: var(--bg-main); font-weight: 600; border: none; border-radius: 8px; cursor: pointer; }

/* SHELF & TRACK ARCHITECTURE */
#workspace-shelves-zone { display: flex; flex-direction: column; gap: 30px; margin-top: 25px; }
.track-shelf-block { background-color: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 14px; padding: 20px; transition: border-color 0.3s ease; }
.track-shelf-block.selected-target { border-color: var(--accent-blue); background-color: rgba(56, 189, 248, 0.02); }
.track-metadata-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; border-bottom: 1px solid rgba(255, 255, 255, 0.05); padding-bottom: 10px; }
.track-left-meta { display: flex; align-items: center; gap: 12px; }
.track-selector-tick { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--text-muted); cursor: pointer; display: flex; justify-content: center; align-items: center; transition: all 0.2s; }
.track-shelf-block.selected-target .track-selector-tick { border-color: var(--accent-blue); background-color: var(--accent-blue); }
.track-shelf-block.selected-target .track-selector-tick::after { content: "✓"; color: var(--bg-main); font-size: 0.75rem; font-weight: 900; }
.track-metadata-row h3 { font-size: 1.1rem; font-weight: 600; color: var(--text-bright); }
.track-control-actions { display: flex; gap: 12px; }
.track-btn { background: transparent; border: 1px solid var(--border-color); padding: 4px 10px; border-radius: 6px; color: var(--text-muted); font-size: 0.85rem; cursor: pointer; transition: all 0.2s; }
.track-btn.edit:hover { border-color: var(--accent-blue); color: var(--accent-blue); }
.track-btn.delete:hover { border-color: #ef4444; color: #ef4444; }
.track-btn.maximize-row:hover { border-color: var(--accent-blue); color: var(--text-bright); }

.horizontal-carousel { display: flex; flex-direction: row !important; overflow-x: auto; gap: 16px; padding-bottom: 12px; scroll-behavior: smooth; }

.video-card { flex: 0 0 220px; background-color: var(--bg-main); border: 1px solid var(--border-color); border-radius: 10px; overflow: hidden; cursor: pointer; transition: all 0.25s ease-out; display: flex; flex-direction: column; position: relative; }
.video-card:hover { transform: translateY(-4px); border-color: var(--accent-blue); }
.video-card.active { border-color: var(--accent-blue); background-color: rgba(56, 189, 248, 0.08); box-shadow: 0 0 18px rgba(56, 189, 248, 0.35); transform: translateY(-4px) scale(1.03); z-index: 2; }
.thumbnail-wrapper { width: 100%; aspect-ratio: 16/9; background-color: #000; }
.thumbnail-wrapper img { width: 100%; height: 100%; object-fit: cover; }
.card-info { padding: 10px; display: flex; flex-direction: column; gap: 8px; flex-grow: 1; }
.card-title { font-size: 0.88rem; font-weight: 500; color: var(--text-bright); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-actions { display: flex; justify-content: space-between; align-items: center; margin-top: auto; border-top: 1px solid var(--border-color); padding-top: 6px; }

.delete-folder-btn, .delete-note-btn { background: transparent; border: none; color: var(--text-muted); font-size: 1.2rem; cursor: pointer; transition: color 0.2s; }
.edit-title-btn, .delete-video-btn { background: transparent; border: none; color: var(--text-muted); font-size: 0.9rem; cursor: pointer; transition: color 0.2s; }
.delete-folder-btn:hover, .delete-video-btn:hover, .delete-note-btn:hover { color: #ef4444; }
.edit-title-btn:hover { color: var(--accent-blue); }

#grid-modal-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background-color: rgba(10, 15, 30, 0.85); backdrop-filter: blur(8px); z-index: 9999; display: flex; justify-content: center; align-items: center; transition: opacity 0.3s ease; }
.modal-hidden { opacity: 0; pointer-events: none; }
.modal-content-box { width: 90%; max-width: 1200px; height: 80vh; background-color: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 16px; padding: 25px; display: flex; flex-direction: column; overflow: hidden; }
.modal-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); padding-bottom: 15px; margin-bottom: 20px; }
#close-modal-btn { background-color: rgba(239, 68, 68, 0.1); border: 1px solid #ef4444; color: #ef4444; padding: 6px 16px; border-radius: 6px; cursor: pointer; font-weight: 600; }
#modal-grid-layout { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); grid-auto-rows: max-content; gap: 20px; overflow-y: auto; flex-grow: 1; min-height: 0; padding: 10px 5px; }
#modal-grid-layout .video-card { flex: none; }

/* ==========================================
   AUTHENTICATION OVERLAY CARDS & FORMS
   ========================================== */
#auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(10, 15, 30, 0.85);
    backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease;
}

.auth-card-box {
    width: 100%;
    max-width: 400px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    display: flex;
    flex-direction: column;
}

.auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.auth-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-bright);
}

#close-auth-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
}
#close-auth-btn:hover { color: #ef4444; }

.auth-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.4;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    gap: 15px;
}

.auth-tab-btn {
    background: transparent;
    border: none;
    padding-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
}

.auth-tab-btn.active {
    color: var(--accent-blue);
}

.auth-tab-btn.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-blue);
}

#auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-group input {
    padding: 10px 14px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-bright);
    font-size: 0.95rem;
    outline: none;
}
.form-group input:focus { border-color: var(--accent-blue); }

#auth-submit-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-blue);
    color: var(--bg-main);
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    margin-top: 8px;
    transition: transform 0.2s;
}
#auth-submit-btn:hover { transform: translateY(-1px); }

.auth-divider {
    text-align: center;
    margin: 20px 0;
    position: relative;
}
.auth-divider::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--border-color);
    z-index: 1;
}
.auth-divider span {
    background-color: var(--bg-panel);
    padding: 0 10px;
    color: var(--text-muted);
    font-size: 0.78rem;
    position: relative;
    z-index: 2;
}

#google-auth-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--text-bright);
    border: none;
    color: var(--bg-main);
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.98rem;
    gap: 12px;
    transition: background-color 0.2s, transform 0.1s;
}

#google-auth-btn:hover {
    background-color: #e2e8f0;
    transform: translateY(-1px);
}

.google-svg-icon {
    display: inline-block;
    vertical-align: middle;
}