/* ========================================
   General Styles & Reset
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-y: auto;
    overflow-x: hidden;
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Body for login/register pages */
body:not(.dashboard) {
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* ========================================
   Card Styles
   ======================================== */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    padding: 35px;
    margin: 20px auto;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.card-header h3 {
    font-size: 22px;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.card-body {
    padding: 0;
}

.card-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 25px;
    color: #2d3748;
    text-align: center;
}

/* ========================================
   Form Styles
   ======================================== */
.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2d3748;
    font-size: 14px;
}

.form-control, select.form-control, textarea.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 15px;
    color: #2d3748;
    background-color: #fff;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-control:focus, select.form-control:focus, textarea.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background-color: #fff;
}

.form-control:disabled {
    background-color: #f7fafc;
    cursor: not-allowed;
    opacity: 0.6;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

/* ========================================
   Button Styles
   ======================================== */
.btn {
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
    text-decoration: none;
    line-height: 1.5;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: #48bb78;
    color: white;
}

.btn-success:hover {
    background: #38a169;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(72, 187, 120, 0.4);
}

.btn-danger {
    background: #f56565;
    color: white;
}

.btn-danger:hover {
    background: #e53e3e;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(245, 101, 101, 0.4);
}

.btn-secondary {
    background: #718096;
    color: white;
}

.btn-secondary:hover {
    background: #4a5568;
    transform: translateY(-2px);
}

.btn-info {
    background: #4299e1;
    color: white;
}

.btn-info:hover {
    background: #3182ce;
    transform: translateY(-2px);
}

.btn-warning {
    background: #ed8936;
    color: white;
}

.btn-warning:hover {
    background: #dd6b20;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
    display: block;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 17px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* ========================================
   Alert Styles
   ======================================== */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-success {
    background-color: #f0fdf4;
    border-color: #48bb78;
    color: #22543d;
}

.alert-error {
    background-color: #fff5f5;
    border-color: #f56565;
    color: #742a2a;
}

.alert-warning {
    background-color: #fffbeb;
    border-color: #ed8936;
    color: #7c2d12;
}

.alert-info {
    background-color: #eff6ff;
    border-color: #4299e1;
    color: #1e3a8a;
}

/* ========================================
   Table Styles
   ======================================== */
.table-responsive {
    overflow-x: auto;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

table th {
    padding: 16px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

table td {
    padding: 14px 12px;
    border-bottom: 1px solid #e2e8f0;
    color: #2d3748;
    font-size: 14px;
}

table tbody tr {
    transition: background-color 0.2s ease;
}

table tbody tr:hover {
    background-color: #f7fafc;
}

table tbody tr:last-child td {
    border-bottom: none;
}

/* ========================================
   Navigation Bar
   ======================================== */
.navbar {
    background: white;
    padding: 0;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    gap: 30px;
    list-style: none;
    align-items: center;
}

.navbar-menu li {
    margin: 0;
}

.navbar-menu a {
    text-decoration: none;
    color: #2d3748;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s ease;
    padding: 8px 0;
    position: relative;
}

.navbar-menu a:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.navbar-menu a:hover {
    color: #667eea;
}

.navbar-menu a:hover:after {
    width: 100%;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
}

.user-info span {
    font-weight: 500;
    color: #2d3748;
}

/* ========================================
   Dashboard Styles
   ======================================== */
.dashboard {
    background: #f7fafc;
    min-height: 100vh;
}

.dashboard .container {
    padding-top: 30px;
    padding-bottom: 30px;
}

.dashboard h1 {
    color: #2d3748;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 30px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid;
    position: relative;
    overflow: hidden;
}

.stat-card:nth-child(1) {
    border-left-color: #667eea;
}

.stat-card:nth-child(2) {
    border-left-color: #48bb78;
}

.stat-card:nth-child(3) {
    border-left-color: #ed8936;
}

.stat-card:nth-child(4) {
    border-left-color: #f56565;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.stat-card:before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-icon {
    font-size: 36px;
    margin-bottom: 12px;
    display: block;
}

.stat-card h3 {
    color: #718096;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: #2d3748;
    line-height: 1;
}

/* ========================================
   Badge Styles
   ======================================== */
.badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background-color: #c6f6d5;
    color: #22543d;
}

.badge-warning {
    background-color: #fef3c7;
    color: #7c2d12;
}

.badge-danger {
    background-color: #fed7d7;
    color: #742a2a;
}

.badge-info {
    background-color: #dbeafe;
    color: #1e3a8a;
}

.badge-secondary {
    background-color: #e2e8f0;
    color: #4a5568;
}

/* ========================================
   Modal Styles
   ======================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}

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

.modal-content {
    background-color: white;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease-out;
}

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

.modal-header {
    padding: 25px 30px;
    border-bottom: 2px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    color: #2d3748;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: #718096;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
}

.modal-close:hover {
    color: #f56565;
}

.modal-body {
    padding: 25px 30px;
}

.modal-footer {
    padding: 20px 30px;
    border-top: 2px solid #f0f0f0;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.text-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.text-link:hover {
    color: #764ba2;
    text-decoration: underline;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.pt-1 { padding-top: 8px; }
.pt-2 { padding-top: 16px; }
.pt-3 { padding-top: 24px; }

.pb-1 { padding-bottom: 8px; }
.pb-2 { padding-bottom: 16px; }
.pb-3 { padding-bottom: 24px; }

/* ========================================
   Grid System
   ======================================== */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -15px;
}

.col, .col-md-12, .col-md-6, .col-md-4, .col-md-3 {
    padding: 15px;
}

.col {
    flex: 1;
}

.col-md-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

.col-md-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-md-4 {
    flex: 0 0 33.333%;
    max-width: 33.333%;
}

.col-md-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

/* ========================================
   Auth Container (Login/Register)
   ======================================== */
.auth-container {
    max-width: 480px;
    width: 90%;
    margin: 50px auto;
}

.auth-container .card {
    padding: 40px;
}

.auth-container .card-title {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

/* ========================================
   Loading Spinner
   ======================================== */
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 30px auto;
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .col-md-12, .col-md-6, .col-md-4, .col-md-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    .navbar-content {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }
    
    .navbar-menu {
        flex-direction: column;
        width: 100%;
        gap: 10px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .modal-content {
        width: 95%;
    }
    
    table {
        font-size: 13px;
    }
    
    table th, table td {
        padding: 10px 8px;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 25px 20px;
    }
    
    .auth-container .card {
        padding: 30px 25px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .stat-card {
        padding: 20px;
    }
    
    .stat-value {
        font-size: 28px;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .navbar, .btn, .modal {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ========================================
   Additional Utility Classes
   ======================================== */
.d-flex {
    display: flex;
}

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

.flex-wrap {
    flex-wrap: wrap;
}

.gap-10 {
    gap: 10px;
}

.gap-15 {
    gap: 15px;
}

.gap-20 {
    gap: 20px;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.align-center {
    align-items: center;
}

.w-100 {
    width: 100%;
}

.h-100 {
    height: 100%;
}

.overflow-hidden {
    overflow: hidden;
}

.overflow-auto {
    overflow: auto;
}

/* ========================================
   Custom Scrollbar
   ======================================== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* ========================================
   Focus Visible (Accessibility)
   ======================================== */
*:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

button:focus-visible, .btn:focus-visible {
    outline: 3px solid rgba(102, 126, 234, 0.5);
}