:root {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
    /* Configuração Glassmorfismo solicitada */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: 1px outset rgba(255, 255, 255, 0.35);
    --glass-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
    --glass-blur: blur(16px);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --success: #22c55e;
    --danger: #ef4444;
    --sidebar-w: 260px;
    --sidebar-c: 80px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.light-mode {
    --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    --glass-bg: rgba(255, 255, 255, 0.4);
    --glass-border: 1px outset rgba(0, 0, 0, 0.1);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
}

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

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    transition: background 0.5s ease;
    overflow-x: hidden;
}

/* Sidebar */
aside {
    width: var(--sidebar-w);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: var(--glass-border);
    box-shadow: var(--glass-shadow);
    height: 100vh;
    position: fixed;
    padding: 24px 15px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 100;
    overflow: hidden;
}

aside.collapsed { width: var(--sidebar-c); }

.logo-area {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 40px;
    padding-left: 10px;
}

#logo-text { font-size: 1.2rem; white-space: nowrap; transition: opacity 0.3s; }
.collapsed #logo-text { opacity: 0; pointer-events: none; }

.nav-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 15px;
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
    cursor: pointer;
}

.nav-link i { min-width: 24px; display: flex; justify-content: center; }
.nav-link:hover, .nav-link.active { background: rgba(255, 255, 255, 0.1); color: var(--accent); }
.collapsed .nav-link span { opacity: 0; pointer-events: none; }

/* Main Area */
main {
    flex: 1;
    margin-left: var(--sidebar-w);
    padding: 40px;
    transition: var(--transition);
}

.collapsed + main { margin-left: var(--sidebar-c); }

header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 40px; }

.content-view { display: none; }
.content-view.active { display: block; animation: fadeIn 0.4s ease; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Cards & Layout Grid */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 24px;
    padding: 24px;
    margin-bottom: 24px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; font-weight: bold; }

input, select {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    padding: 12px;
    border-radius: 12px;
    color: white;
    outline: none;
    transition: 0.3s;
}

input:focus { border-color: var(--accent); }

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: 0.3s;
    width: fit-content;
}

.btn-primary:hover { filter: brightness(1.2); transform: translateY(-2px); }

/* Playlist Builder Specific */
.playlist-builder-grid {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 25px;
    margin-top: 20px;
}

.files-selection-pane {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.files-selection-list {
    max-height: 450px;
    overflow-y: auto;
    background: rgba(0,0,0,0.1);
    border-radius: 16px;
    padding: 10px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 10px;
    transition: 0.2s;
    cursor: pointer;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.file-item:hover { background: rgba(255,255,255,0.05); }

/* Tables */
.data-table { width: 100%; border-collapse: collapse; margin-top: 15px; }
.data-table th { text-align: left; padding: 15px; font-size: 0.8rem; color: var(--text-secondary); border-bottom: 1px solid var(--glass-border); }
.data-table td { padding: 15px; border-bottom: 1px solid rgba(255,255,255,0.05); font-size: 0.9rem; }

.tag-badge {
    background: rgba(56, 189, 248, 0.2);
    color: var(--accent);
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 0.75rem;
    border: 1px solid rgba(56, 189, 248, 0.3);
}

/* Units & Dashboard */
.grid-unidades {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.status-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 8px; }
.online { background: var(--success); box-shadow: 0 0 10px var(--success); }
.offline { background: var(--danger); }

.theme-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    box-shadow: var(--glass-shadow);
}

@media (max-width: 1024px) {
    .playlist-builder-grid { grid-template-columns: 1fr; }
}