:root {
    --primary-color: #000000;
    --secondary-color: #4ade80;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-blue: #0ea5e9;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #000000;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --hover-color: #f3f4f6;
    --sidebar-bg: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
}

/* ========== LOGIN ========== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 20px;
}

.login-card {
    background: white;
    padding: 48px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    width: 100%;
    max-width: 420px;
}

.login-logo {
    text-align: center;
    margin-bottom: 40px;
}

.login-logo img {
    width: 240px;
    height: auto;
    object-fit: contain;
}

.login-title {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-form input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.2s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-login {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-login:hover {
    background-color: #1a1a1a;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.login-error {
    background: #fef2f2;
    color: #dc2626;
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 20px;
    display: none;
}

/* ========== LAYOUT PRINCIPAL ========== */
.app-container {
    display: none;
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 260px;
    height: 100vh;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.sidebar-logo img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.sidebar-logo-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-logo-text small {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 400;
}

.sidebar-user {
    background: var(--bg-color);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.sidebar-user-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.sidebar-user-role {
    font-size: 12px;
    color: var(--text-secondary);
}

.nav-menu {
    flex: 1;
}

.nav-menu h3 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    margin-top: 20px;
}

.nav-menu h3:first-child {
    margin-top: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 4px;
    font-size: 14px;
    color: var(--text-primary);
}

.nav-item:hover {
    background: var(--hover-color);
}

.nav-item.active {
    background-color: var(--primary-color);
    color: white;
}

.nav-item .icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.nav-item .badge {
    margin-left: auto;
    background: var(--accent-red);
    color: white;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.nav-item.active .badge {
    background: white;
    color: var(--primary-color);
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    width: 100%;
    transition: all 0.2s;
}

.btn-logout:hover {
    background: #fef2f2;
    border-color: var(--accent-red);
    color: var(--accent-red);
}

/* ========== CONTEUDO PRINCIPAL ========== */
.main-content {
    margin-left: 260px;
    padding: 30px;
    min-height: 100vh;
}

.page-header {
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.page-header p {
    font-size: 15px;
    color: var(--text-secondary);
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

/* ========== CARDS DE ESTATISTICAS ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.blue { background: #dbeafe; }
.stat-icon.green { background: #d1fae5; }
.stat-icon.orange { background: #fef3c7; }
.stat-icon.red { background: #fee2e2; }

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ========== TABELAS ========== */
.data-section {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.section-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-input {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    min-width: 150px;
}

.filter-input:focus {
    outline: none;
    border-color: var(--accent-green);
}

.btn-filter {
    padding: 10px 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-filter:hover {
    background: var(--border-color);
}

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

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

th, td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    background: var(--bg-color);
}

td {
    font-size: 14px;
    color: var(--text-primary);
}

tr:hover {
    background: var(--hover-color);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.pendente {
    background: #fef3c7;
    color: #b45309;
}

.status-badge.em-correcao {
    background: #dbeafe;
    color: #1d4ed8;
}

.status-badge.corrigida {
    background: #d1fae5;
    color: #047857;
}

.status-badge.atrasada {
    background: #fee2e2;
    color: #dc2626;
}

.status-badge.devolvida {
    background: #fecaca;
    color: #b91c1c;
}

.btn-action {
    padding: 8px 14px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-action.primary:hover {
    background: #059669;
}

.btn-action.secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-action.secondary:hover {
    background: var(--border-color);
}

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

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

.btn-action.warning {
    background: var(--accent-orange);
    color: white;
}

.btn-action.warning:hover {
    background: #d97706;
}

/* ========== MODAL DE CORRECAO ========== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ========== INTERFACE DE CORRECAO ========== */
.correcao-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.correcao-redacao {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 20px;
}

.correcao-redacao-header {
    margin-bottom: 15px;
}

.correcao-redacao-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.correcao-redacao-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

.correcao-redacao-content {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    min-height: 400px;
    max-height: 500px;
    overflow-y: auto;
    line-height: 1.8;
    font-size: 15px;
}

.correcao-redacao-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background: #dbeafe;
    border-radius: 8px;
    color: #1d4ed8;
    text-decoration: none;
    font-weight: 500;
    margin-top: 15px;
}

.correcao-redacao-link:hover {
    background: #bfdbfe;
}

.correcao-formulario {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.correcao-notas {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 20px;
}

.correcao-notas h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.nota-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.nota-item label {
    font-size: 14px;
    color: var(--text-primary);
}

.nota-input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nota-input {
    width: 60px;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    text-align: center;
}

.nota-input:focus {
    outline: none;
    border-color: var(--accent-green);
}

.nota-max {
    font-size: 13px;
    color: var(--text-secondary);
}

.nota-total {
    background: var(--accent-green);
    color: white;
    padding: 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
}

.nota-total-label {
    font-weight: 600;
    font-size: 16px;
}

.nota-total-value {
    font-size: 24px;
    font-weight: 700;
}

.correcao-feedback {
    flex: 1;
}

.correcao-feedback h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.correcao-feedback textarea {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
    font-family: inherit;
}

.correcao-feedback textarea:focus {
    outline: none;
    border-color: var(--accent-green);
}

.correcao-link-upload {
    margin-top: 15px;
}

.correcao-link-upload label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.correcao-link-upload input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.correcao-link-upload input:focus {
    outline: none;
    border-color: var(--accent-green);
}

.correcao-link-upload small {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ========== UPLOAD DE PDF ========== */
.pdf-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 15px;
}

.pdf-upload-area:hover {
    border-color: var(--accent-green);
    background: #f0fdf4;
}

.pdf-upload-area.dragover {
    border-color: var(--accent-green);
    background: #dcfce7;
}

.pdf-upload-icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.pdf-upload-text {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.pdf-upload-hint {
    font-size: 12px;
    color: var(--text-secondary);
}

.pdf-upload-input {
    display: none;
}

.pdf-preview {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: #dbeafe;
    border-radius: 8px;
    margin-top: 10px;
}

.pdf-preview-icon {
    font-size: 24px;
}

.pdf-preview-info {
    flex: 1;
}

.pdf-preview-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.pdf-preview-size {
    font-size: 12px;
    color: var(--text-secondary);
}

.pdf-preview-remove {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--accent-red);
    cursor: pointer;
    padding: 5px;
}

.upload-progress {
    margin-top: 10px;
}

.upload-progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.upload-progress-fill {
    height: 100%;
    background: var(--accent-green);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.upload-progress-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* ========== ALERTA/TOAST ========== */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 16px 24px;
    border-radius: 10px;
    color: white;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    z-index: 2000;
    display: none;
    animation: slideIn 0.3s ease;
}

.toast.success { background: var(--accent-green); }
.toast.error { background: var(--accent-red); }
.toast.warning { background: var(--accent-orange); }

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ========== EMPTY STATE ========== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.empty-state p {
    font-size: 14px;
}

/* ========== LOADING ========== */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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

/* ========== PAGINACAO ========== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.pagination button:hover:not(:disabled) {
    background: var(--bg-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination span {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== COLUNAS ORDENAVEIS ========== */
th.sortable {
    cursor: pointer;
    user-select: none;
    position: relative;
}

th.sortable:hover {
    background: var(--hover-color);
}

th.sortable .sort-icon {
    margin-left: 5px;
    opacity: 0.4;
    font-size: 12px;
}

th.sortable.asc .sort-icon::after {
    content: '\2191';
}

th.sortable.desc .sort-icon::after {
    content: '\2193';
}

th.sortable.asc .sort-icon,
th.sortable.desc .sort-icon {
    opacity: 1;
}

/* ========== DETALHES DA REDACAO ========== */
.redacao-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.redacao-info-item {
    background: var(--bg-color);
    padding: 15px;
    border-radius: 8px;
}

.redacao-info-item label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.redacao-info-item span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .correcao-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 100;
    }

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

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

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

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