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

:root{
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --text-color: #1f2937;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    
    --ff-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body{
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-color);
    font-family: var(--ff-primary);
    min-height: 100vh;
    padding: 2rem 1rem;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
}

h1 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

h1 span {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #6b7280;
    margin-bottom: 2rem;
}

/* Seção de Importação */
.import-section {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid var(--warning-color);
    box-shadow: var(--shadow-sm);
}

.import-section h3 {
    color: var(--warning-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.import-instructions {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.import-instructions ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.import-instructions li {
    margin: 0.5rem 0;
    color: var(--text-color);
}

.import-instructions em {
    color: var(--primary-color);
    font-weight: 600;
}

.file-input-group {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.file-input {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem 1rem;
    border: 2px dashed var(--warning-color);
    border-radius: 12px;
    background: var(--card-bg);
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-input:hover {
    border-color: var(--primary-color);
    background: var(--bg-color);
}

.import-btn {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

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

.import-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 12px;
    display: none;
}

.import-status.success {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-left: 4px solid var(--success-color);
    color: var(--success-color);
    display: block;
}

.import-status.error {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    border-left: 4px solid var(--danger-color);
    color: var(--danger-color);
    display: block;
}

.separator {
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.separator::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.separator span {
    background: var(--card-bg);
    padding: 0 1rem;
    color: #6b7280;
    font-weight: 600;
}

form{
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 2rem;
    background: var(--bg-color);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.9rem;
}

input{
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--card-bg);
    color: var(--text-color);
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(102 126 234 / 0.1);
    transform: translateY(-2px);
}

button{
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

button:active {
    transform: translateY(0);
}

#opções{
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.opções-btn{
    background: linear-gradient(135deg, #10b981, #059669);
    min-width: 150px;
}

.opções-btn:nth-child(2) {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.opções-btn:nth-child(3) {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

#resultado{
    background: var(--bg-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    min-height: 200px;
}

.turma-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-color);
}

.turma-titulo {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.aluno-card {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.aluno-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.aluno-card h4 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.aluno-card.media-individual {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-left-color: var(--warning-color);
}

.turma-media {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0;
    border-left: 4px solid var(--primary-color);
}

.turma-media h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.aprovado {
    color: var(--success-color);
    font-weight: 700;
}

.reprovado {
    color: var(--danger-color);
    font-weight: 700;
}

.media-destaque {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.2rem;
}

.sucesso {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-radius: 12px;
    padding: 1.5rem;
    border-left: 4px solid var(--success-color);
}

.sucesso h3 {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.no-data {
    text-align: center;
    color: #6b7280;
    font-style: italic;
    padding: 2rem;
}

.media-geral {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-radius: 12px;
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color);
    margin-top: 1.5rem;
}

.media-geral h3, .media-geral h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Seção de Exportação */
.export-section {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 2rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.export-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.export-section p {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.export-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    font-size: 1.1rem;
    min-width: 200px;
}

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

.export-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.export-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 12px;
    display: none;
}

.export-status.success {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-left: 4px solid var(--success-color);
    color: var(--success-color);
    display: block;
}

.export-status.error {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    border-left: 4px solid var(--danger-color);
    color: var(--danger-color);
    display: block;
}

.export-status.info {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-left: 4px solid var(--primary-color);
    color: var(--primary-color);
    display: block;
}

@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .file-input-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .file-input {
        min-width: auto;
    }
    
    #opções {
        flex-direction: column;
        align-items: center;
    }
    
    .opções-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .turma-section {
        padding: 1rem;
    }
    
    .aluno-card {
        padding: 1rem;
    }
    
    .import-section {
        padding: 1.5rem;
    }
}