/* NEXUS UNIVERSITY ERP - Responsive Styles */

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

:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --info-color: #3B82F6;
    --dark: #1F2937;
    --dark-light: #374151;
    --gray: #6B7280;
    --gray-light: #E5E7EB;
    --white: #FFFFFF;
    --sidebar-width: 280px;
    --topnav-height: 70px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #F3F4F6;
    color: var(--dark);
    line-height: 1.6;
}

/* Top Navigation */
.topnav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topnav-height);
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 1000;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--gray-light);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 28px;
}

.nav-center {
    flex: 1;
    max-width: 600px;
    margin: 0 20px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.search-box input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 1px solid var(--gray-light);
    border-radius: 10px;
    font-size: 14px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-info {
    display: flex;
    gap: 20px;
    margin-right: 15px;
    padding-right: 15px;
    border-right: 2px solid var(--gray-light);
}

.nav-info span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--gray);
}

.nav-info i {
    color: var(--primary-color);
}

.nav-icon {
    position: relative;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--gray);
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-icon:hover {
    background: var(--gray-light);
    color: var(--primary-color);
}

.nav-icon .badge {
    position: absolute;
    top: 5px;
    right: 5px;
    background: var(--danger-color);
    color: var(--white);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 700;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.user-menu:hover {
    background: var(--gray-light);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--topnav-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--topnav-height));
    background: var(--white);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    transition: var(--transition);
    z-index: 999;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--gray-light);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--gray);
}

.sidebar-content {
    padding: 15px 0;
}

.sidebar-item {
    margin: 5px 0;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    position: relative;
}

.sidebar-link i:first-child {
    font-size: 18px;
    width: 24px;
    text-align: center;
    color: var(--gray);
}

.sidebar-link span {
    flex: 1;
}

.sidebar-link:hover {
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary-color);
}

.sidebar-link:hover i {
    color: var(--primary-color);
}

.sidebar-link.active {
    background: linear-gradient(90deg, rgba(79, 70, 229, 0.1) 0%, rgba(79, 70, 229, 0.05) 100%);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

.sidebar-link.active i {
    color: var(--primary-color);
}

.dropdown-toggle {
    position: relative;
}

.dropdown-icon {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.dropdown-toggle.active .dropdown-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(0, 0, 0, 0.02);
}

.dropdown-menu.active {
    max-height: 1000px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px 12px 56px;
    color: var(--dark);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
}

.dropdown-item i {
    font-size: 14px;
    width: 20px;
    text-align: center;
    color: var(--gray);
}

.dropdown-item:hover {
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary-color);
}

.dropdown-item:hover i {
    color: var(--primary-color);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--topnav-height);
    padding: 30px;
    min-height: calc(100vh - var(--topnav-height));
    transition: var(--transition);
}

/* Dashboard Cards */
.dashboard-header {
    margin-bottom: 30px;
}

.dashboard-header h1 {
    font-size: 32px;
    color: var(--dark);
    margin-bottom: 8px;
}

.dashboard-header p {
    color: var(--gray);
    font-size: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

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

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

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

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

.stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--white);
}

.stat-card.primary .stat-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.stat-card.success .stat-icon {
    background: linear-gradient(135deg, var(--secondary-color), #34D399);
}

.stat-card.warning .stat-icon {
    background: linear-gradient(135deg, var(--warning-color), #FBBF24);
}

.stat-card.info .stat-icon {
    background: linear-gradient(135deg, var(--info-color), #60A5FA);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--gray);
    font-size: 14px;
    font-weight: 500;
}

.stat-change {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 13px;
    margin-top: 10px;
}

.stat-change.positive {
    color: var(--secondary-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

/* Content Sections */
.content-section {
    background: var(--white);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--gray-light);
}

.section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
}

.btn-danger {
    background: var(--danger-color);
    color: var(--white);
}

.btn-danger:hover {
    background: #DC2626;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--gray-light);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--gray-light);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
    background: var(--white);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-top: 20px;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: var(--gray-light);
}

.table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    font-size: 14px;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid var(--gray-light);
    font-size: 14px;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: rgba(79, 70, 229, 0.02);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.badge-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* Settings Page Styles */
.settings-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.settings-tab {
    padding: 12px 20px;
    border: none;
    background: var(--white);
    color: var(--gray);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

.settings-tab:hover {
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary-color);
}

.settings-tab.active {
    background: var(--primary-color);
    color: var(--white);
}

.settings-content {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Responsive Design */
/* Tablet */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .nav-info {
        display: none;
    }

    .logo-text {
        display: none;
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .topnav {
        padding: 0 15px;
    }

    .nav-center {
        display: none;
    }

    .user-name {
        display: none;
    }

    .main-content {
        padding: 20px 15px;
    }

    .dashboard-header h1 {
        font-size: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .table-container {
        overflow-x: scroll;
    }

    .table {
        min-width: 600px;
    }

    .content-section {
        padding: 20px 15px;
    }

    .settings-nav {
        flex-direction: column;
    }

    .settings-tab {
        width: 100%;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .topnav {
        height: 60px;
    }

    :root {
        --topnav-height: 60px;
    }

    .nav-right {
        gap: 5px;
    }

    .nav-icon {
        padding: 8px;
        font-size: 18px;
    }

    .user-avatar {
        width: 35px;
        height: 35px;
    }

    .stat-value {
        font-size: 24px;
    }

    .btn {
        padding: 8px 15px;
        font-size: 13px;
    }
}

/* Print Styles */
@media print {
    .topnav,
    .sidebar,
    .btn,
    .nav-icon {
        display: none !important;
    }

    .main-content {
        margin: 0;
        padding: 0;
    }

    .content-section {
        box-shadow: none;
        page-break-inside: avoid;
    }
}

/* Dark mode support */
body.dark-mode {
    --dark: #F9FAFB;
    --white: #1F2937;
    --gray-light: #374151;
    --gray: #9CA3AF;
    background: #111827;
}

body.dark-mode .topnav {
    background: #1F2937;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

body.dark-mode .sidebar {
    background: #1F2937;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

body.dark-mode .content-section,
body.dark-mode .stat-card {
    background: #1F2937;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

body.dark-mode .main-content {
    background: #111827;
}

body.dark-mode .form-control,
body.dark-mode .form-select {
    background: #374151;
    color: #F9FAFB;
    border-color: #4B5563;
}

body.dark-mode .form-control:focus,
body.dark-mode .form-select:focus {
    background: #374151;
}

body.dark-mode .table thead {
    background: #374151;
}

body.dark-mode .table tbody tr:hover {
    background: rgba(79, 70, 229, 0.1);
}

body.dark-mode .table td {
    border-bottom-color: #374151;
}

body.dark-mode .dropdown-menu {
    background: rgba(55, 65, 81, 0.3);
}

body.dark-mode .sidebar-link:hover,
body.dark-mode .dropdown-item:hover {
    background: rgba(79, 70, 229, 0.2);
}

body.dark-mode .menu-toggle:hover {
    background: #374151;
}

body.dark-mode .search-box input {
    background: #374151;
    color: #F9FAFB;
    border-color: #4B5563;
}

body.dark-mode .search-box input::placeholder {
    color: #9CA3AF;
}

body.dark-mode .user-menu:hover {
    background: #374151;
}

body.dark-mode .nav-icon:hover {
    background: #374151;
}

body.dark-mode .settings-content {
    background: #1F2937;
}

body.dark-mode .settings-tab {
    background: #374151;
}

body.dark-mode .settings-tab:hover {
    background: rgba(79, 70, 229, 0.3);
}

/* Theme toggle animation */
#themeToggle {
    transition: transform 0.3s ease;
}

#themeToggle:active {
    transform: rotate(360deg);
}

@media (prefers-color-scheme: dark) {
    /* Auto dark mode based on system preference */
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--gray-light);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
    border-left: 4px solid var(--secondary-color);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
    border-left: 4px solid var(--info-color);
}