/* ==========================================================================
   UPXtream — Modern Dark Theme Design System (Vanilla CSS3)
   ========================================================================== */

:root {
    --bg-dark: #121212;
    --bg-card: #1E1E2E;
    --bg-card-hover: #262638;
    --bg-input: #181824;
    --border-color: #2D2D42;
    --border-light: #3D3D5C;
    
    --text-main: #FFFFFF;
    --text-muted: #94A3B8;
    --text-dark: #64748B;
    
    --cyan-accent: #5DF0FF;
    --cyan-hover: #00D2E6;
    --cyan-glow: rgba(93, 240, 255, 0.15);
    
    --emerald-success: #20C997;
    --amber-warning: #FFD166;
    --rose-danger: #FF6B6B;
    --blue-info: #3B82F6;

    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --sidebar-width: 260px;
    --topbar-height: 70px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--cyan-accent);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--cyan-hover);
}

/* Layout Structure */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width);
    min-width: 0;
    transition: var(--transition-fast);
}

.content-body {
    flex: 1;
    padding: 24px;
}

/* Sidebar Styling */
.app-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition-fast);
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-color);
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-main);
}

.brand-icon {
    width: 38px;
    height: 38px;
    object-fit: contain;
    filter: drop-shadow(0 0 8px var(--cyan-glow));
}

.brand-title {
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.5px;
    display: block;
}

.brand-version {
    font-size: 10px;
    color: var(--cyan-accent);
    background: var(--cyan-glow);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 12px;
    overflow-y: auto;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dark);
    margin: 16px 12px 8px 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    font-weight: 500;
    margin-bottom: 4px;
    transition: var(--transition-fast);
}

.nav-item:hover, .nav-item.active {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    background: var(--cyan-glow);
    color: var(--cyan-accent);
    border-left: 3px solid var(--cyan-accent);
}

.nav-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.submenu-arrow {
    margin-left: auto;
    font-size: 12px;
    transition: transform 0.2s;
}

.nav-item-has-submenu.open .submenu-arrow {
    transform: rotate(180deg);
}

.submenu {
    display: none;
    padding-left: 34px;
    margin-bottom: 6px;
}

.nav-item-has-submenu.open .submenu {
    display: block;
}

.submenu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    color: var(--text-muted);
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.submenu-item:hover, .submenu-item.active {
    color: var(--cyan-accent);
    background: rgba(93, 240, 255, 0.05);
}

.sidebar-storage-card {
    margin: 16px 12px;
    padding: 14px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.storage-info {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    margin-bottom: 8px;
}

.storage-title { color: var(--text-muted); }
.storage-value { font-weight: 600; color: var(--cyan-accent); }

.storage-progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.storage-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--cyan-accent), #3B82F6);
    border-radius: 3px;
}

/* Topbar Styling */
.app-topbar {
    height: var(--topbar-height);
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    display: none;
}

.page-header-title h2 {
    font-size: 18px;
    font-weight: 600;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-profile-dropdown {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 20px;
}

.user-avatar {
    font-size: 24px;
    color: var(--cyan-accent);
}

.user-meta {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 13px;
    line-height: 1.2;
}

.user-role {
    font-size: 9px;
    color: var(--cyan-accent);
}

/* Cards & Grid System */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.stat-title {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: rgba(255, 255, 255, 0.03);
}

.icon-cyan { color: var(--cyan-accent); background: var(--cyan-glow); }
.icon-emerald { color: var(--emerald-success); background: rgba(32, 201, 151, 0.15); }
.icon-amber { color: var(--amber-warning); background: rgba(255, 209, 102, 0.15); }
.icon-rose { color: var(--rose-danger); background: rgba(255, 107, 107, 0.15); }
.icon-blue { color: var(--blue-info); background: rgba(59, 130, 246, 0.15); }

/* Content Box / Panel */
.panel-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table-custom {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}

.table-custom th {
    padding: 12px 16px;
    background: var(--bg-dark);
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table-custom td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: middle;
}

.table-custom tbody tr:hover {
    background-color: var(--bg-card-hover);
}

/* Buttons & Inputs */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-cyan { background: var(--cyan-accent); color: #000; font-weight: 600; }
.btn-cyan:hover { background: var(--cyan-hover); color: #000; box-shadow: 0 0 12px var(--cyan-glow); }

.btn-secondary { background: var(--bg-dark); color: var(--text-main); border-color: var(--border-color); }
.btn-secondary:hover { background: var(--border-color); }

.btn-danger { background: var(--rose-danger); color: #FFF; }
.btn-danger:hover { background: #e05252; }

.form-control, .form-select {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: inherit;
    font-size: 13px;
    outline: none;
    transition: var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    border-color: var(--cyan-accent);
    box-shadow: 0 0 0 2px var(--cyan-glow);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 8px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
}

.badge-success { background: rgba(32, 201, 151, 0.2); color: var(--emerald-success); }
.badge-danger { background: rgba(255, 107, 107, 0.2); color: var(--rose-danger); }
.badge-warning { background: rgba(255, 209, 102, 0.2); color: var(--amber-warning); }
.badge-cyan { background: var(--cyan-glow); color: var(--cyan-accent); }

/* Dropzone Upload */
.upload-dropzone {
    border: 2px dashed var(--border-light);
    border-radius: var(--radius-lg);
    padding: 50px 20px;
    text-align: center;
    background: var(--bg-dark);
    cursor: pointer;
    transition: var(--transition-fast);
}

.upload-dropzone:hover, .upload-dropzone.dragover {
    border-color: var(--cyan-accent);
    background: var(--cyan-glow);
}

.dropzone-icon {
    font-size: 48px;
    color: var(--cyan-accent);
    margin-bottom: 16px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

.toast {
    min-width: 280px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Helper Utilities */
.text-cyan { color: var(--cyan-accent) !important; }
.text-emerald { color: var(--emerald-success) !important; }
.text-amber { color: var(--amber-warning) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-danger { color: var(--rose-danger) !important; }

.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}
.alert-success { background: rgba(32, 201, 151, 0.15); border: 1px solid var(--emerald-success); color: var(--emerald-success); }
.alert-danger { background: rgba(255, 107, 107, 0.15); border: 1px solid var(--rose-danger); color: var(--rose-danger); }
.alert-warning { background: rgba(255, 209, 102, 0.15); border: 1px solid var(--amber-warning); color: var(--amber-warning); }

.alert-close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    font-size: 18px;
    cursor: pointer;
}

/* Responsive Rules */
@media (max-width: 992px) {
    .app-sidebar { transform: translateX(-100%); }
    .app-sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .btn-sidebar-toggle { display: block; }
    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.7);
        z-index: 95;
        display: none;
    }
    .sidebar-overlay.show { display: block; }
}