:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --input-border: #dddddd;
    --input-readonly: #f9f9f9;
    --primary-color: #007bff;
    --error-color: #dc3545;
}

:root {
    /* Cores fixas para Modo Claro (White) */
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --input-border: #dddddd;
    --input-readonly: #f9f9f9;
    --primary-color: #007bff;
    --error-color: #dc3545;
}

/* Forçando o modo white mesmo que o sistema do usuário seja dark */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #f0f2f5;
        --card-bg: #ffffff;
        --text-color: #333333;
        --input-border: #dddddd;
        --input-readonly: #f9f9f9;
        --primary-color: #007bff;
    }
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 15px;
}

.container {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

h2 { margin-bottom: 8px; font-size: 1.5rem; }
.subtitle { margin-bottom: 25px; font-size: 0.9rem; opacity: 0.7; }

/* Sistema de Grid Flexível */
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    flex: 1 1 100%; /* Mobile: Ocupa 100% da largura */
}

/* Proporções para telas maiores (Desktop/Tablet) */
@media (min-width: 600px) {
    .flex-1 { flex: 1; }
    .flex-2 { flex: 2; }
    .flex-3 { flex: 3; }
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
}

input {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.2s ease;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

input[readonly] {
    background-color: var(--input-readonly);
    cursor: not-allowed;
    border-style: dashed;
}

.error {
    color: var(--error-color);
    font-size: 0.75rem;
    margin-top: 5px;
    height: 15px;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
    transition: filter 0.2s;
}

.btn-submit:hover {
    filter: brightness(1.1);
}