/* HDU Inventory Management System - Main Stylesheet */

/* CSS Variables for consistent theming */
:root {
    /* Primary Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-lighter: #dbeafe;
    
    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-dark: #475569;
    --secondary-light: #94a3b8;
    
    /* Status Colors */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #06b6d4;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Layout */
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 70px;
    --navbar-height: 70px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --box-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--gray-50);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-dark);
}

/* Loading Spinner */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Alert Messages */
.alert {
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    color: #065f46;
    background-color: #d1fae5;
    border-color: #a7f3d0;
}

.alert-error {
    color: #991b1b;
    background-color: #fee2e2;
    border-color: #fecaca;
}

.alert-warning {
    color: #92400e;
    background-color: #fef3c7;
    border-color: #fde68a;
}

.alert-info {
    color: #155e75;
    background-color: #cffafe;
    border-color: #a5f3fc;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: auto;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.btn-close:hover {
    opacity: 1;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.5rem;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--gray-500);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.sidebar-toggle:hover {
    background-color: var(--gray-100);
    color: var(--gray-700);
}

/* User Profile in Sidebar */
.user-profile {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: space-between;
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.user-info h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.user-role {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.user-actions {
    display: flex;
    align-items: center;
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gray-100);
    color: var(--gray-600);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 1rem;
}

.logout-btn:hover {
    background: var(--error-color);
    color: var(--white);
    transform: translateY(-1px);
}

/* Sidebar Navigation */
.sidebar-nav {
    padding: 1rem 0;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--gray-600);
    font-weight: 500;
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: var(--gray-50);
    color: var(--primary-color);
    text-decoration: none;
}

.nav-link.active {
    background-color: var(--primary-lighter);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-link i {
    width: 20px;
    text-align: center;
}

.submenu-arrow {
    margin-left: auto;
    font-size: var(--font-size-xs);
    transition: var(--transition-fast);
}

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

.submenu {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
    background-color: var(--gray-50);
}

.has-submenu.open .submenu {
    max-height: 300px;
}

.submenu li a {
    display: block;
    padding: 0.5rem 1.5rem 0.5rem 3.5rem;
    color: var(--gray-600);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.submenu li a:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
    text-decoration: none;
}

/* Sidebar Footer */
.sidebar-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    color: var(--error-color);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
    width: 100%;
}

.logout-btn:hover {
    background-color: #fef2f2;
    text-decoration: none;
}

/* Main Content Area */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: var(--transition);
}

/* Navbar Styles */
.navbar {
    height: var(--navbar-height);
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--box-shadow);
}

.navbar-left,
.navbar-center,
.navbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--gray-600);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background-color: var(--gray-100);
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb i {
    font-size: 0.75rem;
}

/* Search Bar */
.search-container {
    position: relative;
    width: 400px;
    max-width: 100%;
}

.search-input-group {
    position: relative;
    display: flex;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem;
    padding-right: 3rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    background-color: var(--gray-50);
}

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

.search-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.search-btn:hover {
    color: var(--primary-color);
}

/* Search Results Dropdown */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    margin-top: 0.25rem;
}

/* Navbar Items */
.navbar-item {
    position: relative;
}

.notification-btn,
.quick-action-btn,
.user-menu-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification-btn:hover,
.quick-action-btn:hover,
.user-menu-btn:hover {
    background-color: var(--gray-100);
}

.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--error-color);
    color: var(--white);
    font-size: 0.75rem;
    padding: 0.125rem 0.375rem;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

.user-avatar-small {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.user-name-small {
    font-weight: 500;
    color: var(--gray-700);
}

/* Dropdown Menus */
.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    min-width: 250px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-fast);
}

.dropdown.show .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.dropdown-header h6 {
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--gray-50);
    color: var(--primary-color);
    text-decoration: none;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: 0.5rem 0;
}

.dropdown-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

/* Content Wrapper */
.content-wrapper {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

/* Page Header */
.page-header {
    margin-bottom: 2rem;
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.page-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin: 0;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition-fast);
    border-left: 4px solid var(--primary-color);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.stat-card.warning {
    border-left-color: var(--warning-color);
}

.stat-card.info {
    border-left-color: var(--info-color);
}

.stat-card.success {
    border-left-color: var(--success-color);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.stat-card.warning .stat-icon {
    background: #fef3c7;
    color: var(--warning-color);
}

.stat-card.info .stat-icon {
    background: #cffafe;
    color: var(--info-color);
}

.stat-card.success .stat-icon {
    background: #d1fae5;
    color: var(--success-color);
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin: 0;
}

/* Quick Actions */
.quick-actions {
    margin-bottom: 2rem;
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.action-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--gray-700);
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.action-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
    border-color: var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
}

.action-card i {
    font-size: 2rem;
    color: var(--primary-color);
}

.action-card span {
    font-weight: 500;
    text-align: center;
}

/* Recent Activity */
.recent-activity {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.activity-item:hover {
    background-color: var(--gray-50);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--info-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1rem;
    flex-shrink: 0;
}

.activity-content {
    flex: 1;
}

.activity-text {
    font-weight: 500;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.activity-time {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* Footer */
.footer {
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 2rem;
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.separator {
    color: var(--gray-400);
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-danger { color: var(--error-color); }
.text-info { color: var(--info-color); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-success { background-color: var(--success-color); }
.bg-warning { background-color: var(--warning-color); }
.bg-danger { background-color: var(--error-color); }
.bg-info { background-color: var(--info-color); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 0.75rem; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-8 { margin: 2rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-full { border-radius: 9999px; }

.shadow { box-shadow: var(--box-shadow); }
.shadow-lg { box-shadow: var(--box-shadow-lg); }

.transition { transition: var(--transition); }
.transition-fast { transition: var(--transition-fast); }