/* Estilos gerais */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
}

/* Container principal */
.container {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    padding: 24px;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.1);
    max-width: 1200px;
}

/* Painel de controles */
#controls {
    width: 300px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
    background-color: #f9fafb;
    border-radius: 10px;
    border: 1px solid #e5e7eb;
}

#controls h1 {
    margin-top: 0;
    text-align: center;
    color: #111827;
    font-size: 1.5em;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 500;
    color: #374151;
}

.input-group input[type="number"],
.input-group input[type="range"] {
    width: 100%;
    box-sizing: border-box; /* Garante que padding não afete a largura */
}

.input-group input[type="number"] {
     padding: 10px;
     border-radius: 6px;
     border: 1px solid #d1d5db;
     font-size: 1em;
}

.value-display {
    font-weight: bold;
    color: #007bff;
}

/* Botões */
button {
    padding: 12px 18px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: white;
    transition: background-color 0.3s ease, transform 0.1s ease;
}
button:active {
    transform: scale(0.98);
}

#startButton {
    background-color: #28a745; /* Verde */
}

#startButton:hover {
    background-color: #218838;
}

#startButton:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

#pauseButton {
    background-color: #ffc107; /* Amarelo */
    color: #212529;
}

#pauseButton:hover {
    background-color: #e0a800;
}

#pauseButton:disabled {
    background-color: #e9ecef;
    color: #6c757d;
    cursor: not-allowed;
}

#resetButton {
    background-color: #007bff; /* Azul */
}

#resetButton:hover {
    background-color: #0069d9;
}

/* Estilos para o botão da régua */
#rulerButton {
    background-color: #6f42c1; /* Roxo */
    margin-top: 10px;
}

#rulerButton:hover {
    background-color: #5a32a3;
}

/* Quando o botão estiver no estado ativo (pressionado) */
#rulerButton.active {
    background-color: #dc3545; /* Muda para vermelho para indicar a ação de desativar */
}

/* Muda o cursor do canvas para uma cruz de medição quando ativo */
#simulationCanvas.measuring {
    cursor: crosshair;
}

/* ... estilos do input-group ... */

.checkbox-group {
    flex-direction: row;
    align-items: center;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 0;
}

.checkbox-group label {
    cursor: pointer;
    user-select: none;
}

/* Painel de informações */
#info-panel {
    margin-top: 10px;
    padding: 15px;
    background-color: #e9ecef;
    border-radius: 8px;
}
#info-panel h2 {
    margin-top: 0;
    margin-bottom: 12px;
    text-align: center;
    font-size: 1.2em;
}
#info-panel p {
    margin: 6px 0;
    font-size: 0.95em;
}
#info-panel .label {
    font-weight: 500;
    color: #495057;
}

/* Área da simulação */
#simulation-area {
    flex-grow: 1;
}

#simulationCanvas {
    border: 2px solid #d1d5db;
    background-color: #f8f9fa;
    border-radius: 8px;
    display: block;
}

/* --- Estilos da Instrução da Régua --- */
#rulerInstruction {
    text-align: center;
    color: #6f42c1; /* Cor a combinar com o botão da régua */
    background-color: #f3e8ff; /* Fundo roxo muito claro */
    padding: 10px;
    border-radius: 6px;
    margin-top: 15px;
    font-size: 0.95em;
    border: 1px solid #d8b4fe;
    
    /* Transição suave para aparecer/desaparecer */
    opacity: 1;
    transition: opacity 0.3s ease;
}

/* Classe que esconde o elemento */
#rulerInstruction.hidden {
    display: none;
    opacity: 0;
}

/* --- Botão de Ajuda (?) --- */
.help-btn {
    background-color: #17a2b8;
    color: white;
    border: none;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    margin-left: 8px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.help-btn:hover {
    background-color: #138496;
}

/* --- Modal / Popup --- */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6); /* Fundo escuro semitransparente */
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none; /* Impede cliques quando estiver invisível */
}

.modal-content {
    background-color: #fff;
    padding: 24px;
    border-radius: 10px;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    position: relative;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 26px;
    font-weight: bold;
    color: #888;
    cursor: pointer;
}

.close-btn:hover {
    color: #333;
}

/* --- Legenda dos Desenhos dos Vetores --- */
.vector-legend {
    list-style: none;
    padding: 0;
    margin: 0;
}

.vector-legend li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 16px;
    font-size: 0.95em;
    line-height: 1.4;
}

.vector-legend strong {
    color: #111827;
}

/* O "desenho" da linha do vetor */
.vector-line {
    width: 25px;
    height: 0;
    border-top-width: 4px;
    margin-top: 8px;
    margin-right: 15px;
    flex-shrink: 0;
}

.vector-line.solid { border-top-style: solid; }
.vector-line.dashed { border-top-style: dashed; }

/* O "desenho" do arco do ângulo θ */
.vector-arc {
    width: 20px;
    height: 20px;
    background-color: rgba(0, 123, 255, 0.15);
    border: 2px solid #0056b3;
    border-radius: 0 100% 0 0; /* Forma de fatia de pizza/arco */
    margin-top: 2px;
    margin-right: 20px;
    flex-shrink: 0;
}

/* Grade para a seleção minuciosa dos vetores */
.checkbox-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 4px;
    background-color: #f3f4f6;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
}

.checkbox-grid label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85em;
    font-weight: 500;
    color: #4b5563;
    cursor: pointer;
    user-select: none;
}

.checkbox-grid input[type="checkbox"] {
    width: 14px;
    height: 14px;
    margin: 0;
    cursor: pointer;
}

.site-footer {
    width: 100%; 
    text-align: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e5e7eb; 
    color: #6b7280;
    font-size: 0.85em;
    font-weight: 500;
}