:root {
    /* Refined Pastel Palette */
    --color-accent-fg: #3B71CA;
    --color-fg-default: #332D2D;
    --color-fg-muted: #9FA6B2;
    --color-canvas-default: #ffffff;
    --color-canvas-subtle: #FBFBFB;
    --color-border-default: #e2e8f0;
    --color-success-fg: #14A44D;
    --color-attention-fg: #E4A11B;
    --color-danger-fg: #DC4C64;
    --color-info-fg: #54B4D3;
    
    /* Semantic Backgrounds */
    --bg-primary: #3B71CA;
    --bg-secondary: #9FA6B2;
    --bg-success: #14A44D;
    --bg-danger: #DC4C64;
    --bg-warning: #E4A11B;
    --bg-info: #54B4D3;
    --bg-light: #FBFBFB;
    --bg-dark: #332D2D;
    
    --btn-primary-bg: var(--bg-primary);
    --btn-primary-fg: #ffffff;
    
    --radius-standard: 8px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body { 
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; 
    font-size: 14px; 
    line-height: 1.6;
    color: var(--color-fg-default); 
    background-color: var(--color-canvas-default); 
    -webkit-font-smoothing: antialiased;
}

a { color: var(--color-accent-fg); text-decoration: none; transition: color 0.2s; }
a:hover { color: #1d4ed8; }

/* HEADER LOGIC */
.custom-header {
    background-color: #fff;
    border-bottom: 1px solid var(--color-border-default);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

.header-row-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 64px;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-logo a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-fg-default);
    display: flex;
    align-items: center;
}

.header-search-box {
    flex: 1;
    max-width: 480px;
    margin: 0 24px;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input-wrapper input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    border-radius: var(--radius-standard);
    border: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.search-input-wrapper input:focus {
    background-color: #fff;
    border-color: var(--color-accent-fg);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    outline: none;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--color-fg-muted);
}

.search-submit-btn {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    padding: 4px 8px;
    color: var(--color-fg-muted);
    cursor: pointer;
    font-size: 1rem;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-submit-btn:hover {
    color: var(--color-accent-fg);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.notification-trigger, .tool-trigger, .user-avatar-trigger {
    font-size: 1.25rem;
    color: var(--color-fg-muted);
    cursor: pointer;
    transition: color 0.2s;
    display: flex;
    align-items: center;
}

.notification-trigger:hover, .tool-trigger:hover, .user-avatar-trigger:hover {
    color: var(--color-accent-fg);
}

/* DROPDOWNS (User & Tools) */
.header-user, .header-tools {
    position: relative;
}

.nav-dropdown {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: #fff;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-standard);
    display: none;
    z-index: 1000;
    min-width: 200px;
    box-shadow: var(--shadow-md);
    padding: 8px 0;
}

.nav-dropdown.active {
    display: block;
}

.dropdown-header {
    padding: 8px 16px;
    border-bottom: 1px solid var(--color-border-default);
    margin-bottom: 4px;
}

.dropdown-item {
    display: block;
    padding: 8px 16px;
    color: var(--color-fg-default);
    transition: background 0.2s;
}

.dropdown-item:hover {
    background-color: var(--color-canvas-subtle);
    color: var(--color-accent-fg);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border-default);
    margin: 4px 0;
}

/* HORIZONTAL NAV */
.header-row-bottom {
    background-color: var(--color-canvas-subtle);
    border-top: 1px solid var(--color-border-default);
    padding: 0 24px;
    height: 48px;
}

.horizontal-nav {
    display: flex;
    gap: 8px;
    height: 100%;
}

.nav-link-item {
    display: flex;
    align-items: center;
    padding: 0 16px;
    height: 100%;
    color: var(--color-fg-muted);
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-link-item:hover {
    color: var(--color-fg-default);
    background-color: rgba(0,0,0,0.03);
}

.nav-link-item.active {
    color: var(--color-accent-fg);
    border-bottom-color: var(--color-accent-fg);
}

/* NAVIGATION DROPDOWN CONTENT */
.nav-item-dropdown {
    position: relative;
    height: 100%;
}

.nav-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background-color: #fff;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-default);
    border-radius: 0 0 8px 8px;
    padding: 8px;
    z-index: 1000;
}

.nav-item-dropdown:hover .nav-dropdown-content {
    display: block;
}

.dropdown-link {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    color: var(--color-fg-default);
    border-radius: 6px;
    transition: background 0.2s;
}

.dropdown-link:hover {
    background-color: var(--color-canvas-subtle);
    color: var(--color-accent-fg);
}

/* MOBILE HUD */
.hamburger-toggle {
    display: none;
    cursor: pointer;
}

@media (max-width: 768px) {
    .hamburger-toggle { display: block; font-size: 1.5rem; color: var(--color-fg-muted); }
    .hamburger-toggle.active { color: var(--color-accent-fg); }
    
    .header-search-box { display: none; }
    .header-row-bottom { 
        display: none; 
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background-color: #fff;
        height: auto;
        z-index: 1001;
        box-shadow: var(--shadow-md);
        padding: 0;
    }
    .header-row-bottom.mobile-active { 
        display: block; 
        border-bottom: 1px solid var(--color-border-default); 
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }
    
    .horizontal-nav { flex-direction: column; height: auto; gap: 0; }
    .nav-item-dropdown { height: auto; width: 100%; }
    
    .nav-link-item { 
        height: 52px; 
        padding: 0 24px; 
        border-bottom: 1px solid var(--color-canvas-subtle); 
        border-left: 4px solid transparent;
        width: 100%;
    }
    .nav-link-item.active { border-left-color: var(--color-accent-fg); background-color: var(--color-accent-subtle); }
    
    .nav-dropdown-content { 
        position: static; 
        box-shadow: none; 
        border: none; 
        padding-left: 48px; 
        display: none; 
        background-color: var(--color-canvas-subtle);
    }
    .nav-item-dropdown.mobile-open .nav-dropdown-content { display: block; }
    .nav-link-item.has-children::after {
        content: '\f078';
        font-family: 'Font Awesome 5 Free';
        font-weight: 900;
        margin-left: auto;
        font-size: 0.75rem;
        transition: transform 0.2s;
    }
    .nav-item-dropdown.mobile-open .nav-link-item::after { transform: rotate(180deg); }
}

/* APP BODY */
.app-body {
    background-color: var(--color-canvas-default);
    min-height: calc(100vh - 112px);
}

.app-content {
    padding: 32px 24px;
    max-width: 1440px;
    margin: 0 auto;
}

.content-header {
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.content-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--color-fg-default);
}

/* BREADCRUMBS */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 12px;
    font-size: 0.8125rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    color: var(--color-fg-muted);
}

/* DATA TABLES PREMIUM SKIN */
.dataTables_wrapper {
    background: #fff;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-standard);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.dataTables_filter {
    margin-bottom: 24px;
    margin-right: 8px;
}

.grid-footer {
    margin-top: 24px;
    margin-left: 8px;
    margin-right: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

table.dataTable {
    border-collapse: separate !important;
    border-spacing: 0 !important;
    width: 100% !important;
    margin: 12px 0 !important;
}

table.dataTable thead th {
    background-color: var(--color-canvas-subtle);
    color: var(--color-fg-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    padding: 12px 16px !important;
    border-bottom: 1px solid var(--color-border-default) !important;
}

table.dataTable tbody td {
    padding: 12px 16px !important;
    border-bottom: 1px solid var(--color-border-default) !important;
}

table.dataTable tbody tr.row-linkable:hover td {
    background-color: var(--color-canvas-subtle) !important;
    cursor: pointer;
}

/* STICKY ACTION COLUMN (First Column) */
table.dataTable thead th:first-child,
table.dataTable tbody td:first-child {
    position: sticky;
    left: 0;
    background-color: #fff;
    z-index: 10;
    border-right: 2px solid var(--color-border-default) !important;
}

table.dataTable thead th:first-child {
    background-color: var(--color-canvas-subtle) !important;
    z-index: 11;
}

table.dataTable tbody tr:hover td:first-child {
    background-color: #f8fafc;
}

/* SEMANTIC ACTION BUTTONS */
.btn-action-view { color: var(--color-fg-muted); }
.btn-action-view:hover { color: var(--color-fg-default); background-color: var(--color-border-default); }

.btn-action-edit { color: var(--color-accent-fg); }
.btn-action-edit:hover { background-color: rgba(37, 99, 235, 0.1); }

.btn-action-delete { color: var(--color-danger-fg); }
.btn-action-delete:hover { background-color: rgba(239, 68, 68, 0.1); }

.btn-action-create { 
    background-color: var(--btn-primary-bg); 
    color: #fff !important; 
    border-radius: var(--radius-standard);
    padding: 8px 16px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    border: none;
}

.btn-action-create:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* COMPACT BUTTON GROUPS FOR ACTIONS */
.table-actions .btn-group-compact {
    display: flex;
    gap: 4px;
}

.table-actions .btn-group-compact .btn, 
.table-actions .btn-group-compact a {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border-default);
    background: #fff;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.875rem;
}

.table-actions .btn-group-compact a:hover {
    border-color: currentColor;
}

/* APP FOOTER */
.app-footer {
    border-top: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
}

/* Bootstrap Overrides for Uniformity */
.bg-primary { background-color: var(--bg-primary) !important; color: #fff !important; }
.bg-secondary { background-color: var(--bg-secondary) !important; color: #fff !important; }
.bg-success { background-color: var(--bg-success) !important; color: #fff !important; }
.bg-danger { background-color: var(--bg-danger) !important; color: #fff !important; }
.bg-warning { background-color: var(--bg-warning) !important; color: #fff !important; }
.bg-info { background-color: var(--bg-info) !important; color: #fff !important; }
.bg-light { background-color: var(--bg-light) !important; }
.bg-dark { background-color: var(--bg-dark) !important; color: #fff !important; }

.btn-primary { background-color: var(--bg-primary) !important; border-color: var(--bg-primary) !important; color: #fff !important; }
.btn-primary:hover { filter: brightness(0.9); }
.btn-secondary { background-color: var(--bg-secondary) !important; border-color: var(--bg-secondary) !important; color: #fff !important; }
.btn-success { background-color: var(--bg-success) !important; border-color: var(--bg-success) !important; color: #fff !important; }
.btn-danger { background-color: var(--bg-danger) !important; border-color: var(--bg-danger) !important; color: #fff !important; }
.btn-back-breadcrumb {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-canvas-subtle);
    color: var(--color-fg-muted);
    border: 1px solid var(--color-border-default);
    transition: all 0.2s ease;
    text-decoration: none;
    margin-right: 4px;
}

.btn-back-breadcrumb:hover {
    background-color: var(--color-accent-subtle);
    color: var(--color-accent-fg);
    border-color: var(--color-accent-muted);
    transform: translateX(-2px);
}