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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8fafc;
    color: #334155;
    line-height: 1.6;
}

/* Authentication Styles */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.auth-container {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    width: 90%;
    max-width: 400px;
    overflow: hidden;
    position: relative;
    animation: slideIn 0.4s ease forwards;
}

.auth-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: #f1f5f9;
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #64748b;
    font-size: 1rem;
    transition: all 0.3s ease;
    z-index: 10;
}

.auth-close-btn:hover {
    background: #e2e8f0;
    color: #334155;
    transform: scale(1.1);
}

.auth-tabs {
    display: flex;
    background: #f8fafc;
}

.auth-tab {
    flex: 1;
    padding: 1rem;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: #64748b;
    transition: all 0.3s ease;
}

.auth-tab.active {
    background: white;
    color: #8b5cf6;
    border-bottom: 2px solid #8b5cf6;
}

.auth-form {
    padding: 2rem;
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    color: #1e293b;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.auth-form p {
    color: #64748b;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.auth-btn {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    margin-top: 1rem;
}

.nav-user {
    margin-top: auto;
    padding: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.user-info span {
    color: white;
    font-weight: 500;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.app {
    display: flex;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    width: 280px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.nav-brand {
    padding: 0 2rem 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
}

.nav-brand i {
    font-size: 2rem;
    color: #fbbf24;
    margin-right: 0.5rem;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: bold;
    display: block;
    margin-bottom: 0.25rem;
}

.brand-subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
}

.nav-links {
    padding: 0 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.nav-link i {
    margin-right: 0.75rem;
    width: 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
    min-height: 100vh;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page-header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 2.5rem;
    color: #1e293b;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.page-header h1 i {
    color: #8b5cf6;
}

.page-header p {
    color: #64748b;
    font-size: 1.1rem;
    max-width: 600px;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.3);
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-danger {
    background: #ef4444;
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

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

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-card:nth-child(1) .stat-icon {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}

.stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.stat-content h3 {
    font-size: 2rem;
    font-weight: bold;
    color: #1e293b;
    margin-bottom: 0.25rem;
}

.stat-content p {
    color: #64748b;
    font-size: 0.9rem;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.dashboard-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.dashboard-card h3 {
    font-size: 1.25rem;
    color: #1e293b;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dashboard-card h3 i {
    color: #8b5cf6;
}

.status-item, .activity-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.status-item:last-child, .activity-item:last-child {
    border-bottom: none;
}

.status-item i {
    color: #10b981;
    margin-right: 0.5rem;
}

.activity-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    margin-right: 0.75rem;
}

.activity-time {
    color: #64748b;
    font-size: 0.9rem;
}

.status-count {
    background: #e2e8f0;
    color: #475569;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.9rem;
}

/* Lists */
.students-list, .companies-list {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.student-card, .company-card {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.student-card:last-child, .company-card:last-child {
    border-bottom: none;
}

.student-info, .company-info {
    flex: 1;
}

.student-name, .company-name {
    font-size: 1.25rem;
    font-weight: bold;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.student-gpa {
    color: #10b981;
    font-weight: 500;
    margin-left: 0.5rem;
}

.student-details, .company-details {
    color: #64748b;
    margin-bottom: 0.5rem;
}

.student-skills, .student-interests, .company-culture {
    margin-top: 1rem;
}

.skill-tag, .interest-tag, .culture-tag {
    display: inline-block;
    background: #e2e8f0;
    color: #475569;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    margin: 0.25rem 0.25rem 0.25rem 0;
}

.company-type {
    background: #dbeafe;
    color: #1e40af;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    margin-left: 0.5rem;
}

.student-actions, .company-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.edit-btn {
    background: #e2e8f0;
    color: #475569;
}

.edit-btn:hover {
    background: #cbd5e1;
}

.delete-btn {
    background: #fee2e2;
    color: #dc2626;
}

.delete-btn:hover {
    background: #fecaca;
}

/* AI Allocation */
.allocation-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.agents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.agent-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.agent-card h3 {
    font-size: 1.25rem;
    color: #1e293b;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.agent-card h3 i {
    color: #8b5cf6;
}

.agent-card p {
    color: #64748b;
    margin-bottom: 1.5rem;
}

.agent-status {
    padding: 0.5rem 1rem;
    border-radius: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    background: #e2e8f0;
    color: #475569;
}

.agent-status.processing {
    background: #fef3c7;
    color: #d97706;
}

.agent-status.success {
    background: #d1fae5;
    color: #059669;
}

.agent-status.error {
    background: #fee2e2;
    color: #dc2626;
}

.allocation-results {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    margin-top: 2rem;
}

/* Logs */
.logs-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #64748b;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
}

.search-box input:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.logs-controls select {
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    background: white;
    cursor: pointer;
}

.logs-info {
    color: #64748b;
    margin-bottom: 1rem;
}

.logs-list {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.log-item {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.log-item:last-child {
    border-bottom: none;
}

.log-agent {
    background: #8b5cf6;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 500;
}

.log-message {
    flex: 1;
    color: #1e293b;
}

.log-time {
    color: #64748b;
    font-size: 0.9rem;
}

.log-status {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #10b981;
}

.log-status.error {
    background: #ef4444;
}

.log-status.processing {
    background: #f59e0b;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 1rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.modal-header {
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    color: #1e293b;
}

.close {
    font-size: 2rem;
    color: #64748b;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: #1e293b;
}

/* Forms */
form {
    padding: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #374151;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .navbar {
        width: 250px;
    }
    
    .main-content {
        margin-left: 250px;
    }
}

@media (max-width: 768px) {
    .navbar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
    
    .nav-links {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .nav-link {
        flex: 1;
        min-width: 120px;
        text-align: center;
        padding: 0.75rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .agents-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .logs-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box {
        min-width: auto;
    }
}

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

.page.active {
    animation: fadeIn 0.3s ease;
}

.stat-card {
    animation: fadeIn 0.3s ease;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #e2e8f0;
    border-radius: 50%;
    border-top-color: #8b5cf6;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}