/* =========================================
   Variabel Global & Tema Dasar (UI/UX Musik)
   ========================================= */
:root {
    --bg-dark: #121212;
    --bg-panel: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent-color: #3b82f6; /* Warna aksen biru profesional */
    --accent-hover: #2563eb;
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 70px;
    --header-height: 60px;
    --transition-speed: 0.3s;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* =========================================
   Header Navbar
   ========================================= */
.main-header {
    background-color: var(--bg-panel);
    height: var(--header-height);
    border-bottom: 1px solid #333;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 20px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 35px;
    width: auto;
}

.brand-name {
    font-size: 1.2rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.top-navigation ul {
    display: flex;
    list-style: none;
    gap: 20px;
    align-items: center;
}

.top-navigation a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.top-navigation a:hover {
    color: var(--text-primary);
}

.btn-login {
    background-color: var(--accent-color);
    padding: 8px 16px;
    border-radius: 4px;
    color: #fff !important;
}

/* =========================================
   Layout Utama & Sidebar
   ========================================= */
.app-layout {
    display: flex;
    flex: 1;
    margin-top: var(--header-height);
    overflow: hidden;
}

.main-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-panel);
    border-right: 1px solid #333;
    transition: width var(--transition-speed);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

/* State ketika Sidebar di-collapse */
.main-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-menu {
    padding: 20px 0;
}

.menu-label {
    padding: 0 20px;
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 10px;
    text-transform: uppercase;
    transition: opacity var(--transition-speed);
}

.main-sidebar.collapsed .menu-label {
    opacity: 0;
    pointer-events: none;
}

.sidebar-menu ul {
    list-style: none;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background var(--transition-speed), color var(--transition-speed);
    gap: 15px;
}

.sidebar-menu li a:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--accent-color);
}

.icon {
    font-size: 1.2rem;
    min-width: 25px;
    text-align: center;
}

.menu-text {
    white-space: nowrap;
    transition: opacity var(--transition-speed);
}

.main-sidebar.collapsed .menu-text {
    opacity: 0;
    display: none;
}

.sidebar-toggle-wrapper {
    padding: 15px;
    text-align: right;
    border-top: 1px solid #333;
}

.btn-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: transform var(--transition-speed);
}

.main-sidebar.collapsed .btn-toggle {
    transform: rotate(180deg);
}

/* =========================================
   Konten Utama
   ========================================= */
.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
    background-color: var(--bg-dark);
}

/* Hero Section Khusus Beranda */
.hero-section {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--bg-panel) 0%, var(--bg-dark) 100%);
    border-radius: 8px;
    border: 1px solid #333;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.hero-section p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.hero-buttons .btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin: 0 10px;
    transition: background var(--transition-speed);
}

.hero-buttons .btn:hover {
    background-color: var(--accent-hover);
}

.hero-buttons .btn-secondary {
    background-color: transparent;
    border: 1px solid var(--accent-color);
}

.hero-buttons .btn-secondary:hover {
    background-color: rgba(59, 130, 246, 0.1);
}

/* =========================================
   Footer
   ========================================= */
.main-footer {
    background-color: var(--bg-panel);
    border-top: 1px solid #333;
    padding: 15px 20px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-contact a {
    color: var(--accent-color);
    text-decoration: none;
}

/* =========================================
   Responsive (Tablet & Mobile Optimized)
   ========================================= */
@media (max-width: 992px) {
    /* Tablet Optimized */
    .main-sidebar {
        width: var(--sidebar-collapsed-width);
    }
    .menu-label, .menu-text {
        display: none;
    }
    .sidebar-toggle-wrapper {
        display: none; /* Sembunyikan toggle di tablet, otomatis icon-only */
    }
}

@media (max-width: 768px) {
    /* Mobile Optimized */
    .header-container {
        flex-direction: column;
        justify-content: center;
        gap: 10px;
    }
    .top-navigation ul {
        gap: 10px;
        font-size: 0.9rem;
    }
    .app-layout {
        flex-direction: column;
        margin-top: calc(var(--header-height) + 40px); /* Adjust untuk navbar bertumpuk */
    }
    .main-sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid #333;
        overflow-x: auto;
    }
    .sidebar-menu {
        padding: 0;
        width: 100%;
    }
    .sidebar-menu ul {
        display: flex;
    }
    .sidebar-menu li a {
        padding: 15px;
    }
    .footer-container {
        flex-direction: column;
        gap: 10px;
    }
}