:root {
    --primary-color: #11DC62;
    --secondary-color: #1E0D6F;
    --bg-primary: #0D1117;
    --bg-secondary: #161B22;
    --bg-tertiary: #21262D;
    --text-primary: #F0F6FC;
    --text-secondary: #8B949E;
    --border-color: #30363D;
    --error-color: #F85149;
    --warning-color: #D29922;
    --success-color: #11DC62;
    --info-color: #58A6FF;
    --shadow: 0 0 20px rgba(17, 220, 98, 0.1);
    --shadow-hover: 0 0 30px rgba(17, 220, 98, 0.2);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header & Navigation */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(22, 27, 34, 0.95);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
}

.nav-brand:hover {
    opacity: 0.9;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    flex: 1;
    justify-content: flex-end;
}

.nav-menu li {
    display: flex;
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.95rem;
    white-space: nowrap;
}

.nav-link .material-icons {
    font-size: 1.1rem !important;
    vertical-align: middle;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    font-weight: 500;
}

.nav-user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
    padding-left: 1rem;
    border-left: 1px solid var(--border-color);
}

.nav-username {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: none;
}

/* Mobile Navigation */
@media (max-width: 1024px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        width: 100%;
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-link span:not(.material-icons) {
        display: none;
    }
    
    .nav-link {
        padding: 0.5rem;
    }
    
    .nav-user-section {
        width: 100%;
        justify-content: center;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 0.5rem;
        margin-top: 0.5rem;
    }
}

@media (min-width: 768px) {
    .nav-username {
        display: block;
    }
}

@media (min-width: 1025px) {
    .nav-link span:not(.material-icons) {
        display: inline;
    }
}

/* Forms */
.form-container {
    max-width: 450px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(17, 220, 98, 0.1);
}

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: #0FC955;
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #2A1395;
    box-shadow: var(--shadow-hover);
}

.btn-danger {
    background-color: var(--error-color);
    color: var(--text-primary);
}

.btn-danger:hover {
    background-color: #DA3633;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-block {
    width: 100%;
}

/* Cards */
.card {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.card-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.card-body {
    color: var(--text-secondary);
}

/* Grid System */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Dashboard Stats */
.stat-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

.table th {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 1rem;
    text-align: left;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.table tr:hover {
    background-color: var(--bg-tertiary);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-success {
    background-color: rgba(17, 220, 98, 0.2);
    color: var(--success-color);
}

.badge-danger {
    background-color: rgba(248, 81, 73, 0.2);
    color: var(--error-color);
}

.badge-warning {
    background-color: rgba(210, 153, 34, 0.2);
    color: var(--warning-color);
}

.badge-info {
    background-color: rgba(88, 166, 255, 0.2);
    color: var(--info-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-hover);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-close:hover {
    color: var(--text-primary);
}

/* File Upload */
.file-upload {
    position: relative;
    display: inline-block;
    width: 100%;
}

.file-upload-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-upload-label {
    display: block;
    padding: 2rem;
    background-color: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-upload-label:hover {
    border-color: var(--primary-color);
    background-color: rgba(17, 220, 98, 0.05);
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid;
}

.alert-success {
    background-color: rgba(17, 220, 98, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background-color: rgba(248, 81, 73, 0.1);
    border-color: var(--error-color);
    color: var(--error-color);
}

.alert-warning {
    background-color: rgba(210, 153, 34, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background-color: rgba(88, 166, 255, 0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.footer-link:hover {
    text-decoration: underline;
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .nav-link span:not(.material-icons) {
        display: none;
    }
    
    .nav-link {
        padding: 0.5rem;
    }
    
    .nav-user-section {
        padding-left: 0.5rem;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0.75rem 0;
    }
    
    .nav {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-brand {
        margin-bottom: 0.5rem;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: center;
        gap: 0.25rem;
    }
    
    .nav-menu li {
        flex: 0;
    }
    
    .nav-link {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
    
    .nav-link .material-icons {
        font-size: 1.2rem !important;
    }
    
    .nav-user-section {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 0.5rem;
        margin-top: 0.5rem;
        width: 100%;
        justify-content: center;
    }
    
    .btn-outline {
        font-size: 0.85rem !important;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 1.5rem;
    }
}