:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --tertiary-color: #17a2b8;
    --accent-color: #ffc107;
    --text-color: #333;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --error-color: #dc3545;
    --success-color: #28a745;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    font-size: 18px; /* Ajuste de la tipografía */
}

.container {
    width: 100%;
    max-width: 600px;
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--shadow-color);
}

h1 {
    color: var(--tertiary-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 600;
}

form {
    display: grid;
    gap: 30px; /* Mayor espaciado entre campos */
}

.form-group {
    position: relative;
}

label {
    position: absolute;
    top: 10px;
    left: 15px;
    color: var(--secondary-color);
    font-size: 16px;
    transition: all 0.3s ease;
    pointer-events: none;
}

label[for]:after {
    content: " *"; /* Indicador de campos obligatorios */
    color: var(--error-color);
}

input, select, textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--secondary-color);
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    background-color: transparent;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5); /* Transiciones y sombra suave */
}

input:valid, select:valid, textarea:valid {
    border-color: var(--success-color); /* Estilos de éxito en validación */
    box-shadow: 0 0 5px rgba(40, 167, 69, 0.5);
}

input:focus + label,
input:not(:placeholder-shown) + label,
select:focus + label,
select:not(:placeholder-shown) + label,
textarea:focus + label,
textarea:not(:placeholder-shown) + label {
    top: -12px;
    left: 10px;
    font-size: 14px;
    padding: 0 5px;
    background-color: var(--card-bg);
    color: var(--primary-color);
}

input:hover, select:hover, textarea:hover {
    box-shadow: 0 2px 8px var(--shadow-color); /* Sombra en hover */
}

button {
    padding: 12px 25px;
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 1px;
}

button[type="submit"] {
    background-color: var(--primary-color);
}

button[type="submit"]:hover {
    background-color: var(--tertiary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-color); /* Animación al hacer hover */
}

button[type="submit"].loading {
    background-color: var(--secondary-color);
    cursor: not-allowed; /* Indicador de carga */
}

button[type="reset"] {
    background-color: var(--secondary-color);
}

button[type="reset"]:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-color); /* Efecto de hover */
}

.error {
    color: var(--error-color);
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.file-input {
    position: relative;
    overflow: hidden;
    display: inline-block;
    cursor: pointer;
}

.file-input input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
}

.file-input-label {
    display: inline-block;
    padding: 10px 15px;
    background-color: var(--accent-color);
    color: var(--text-color);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.file-input:hover .file-input-label {
    background-color: var(--primary-color); /* Efecto hover en adjuntar archivo */
    color: white;
    transform: scale(1.05); /* Pequeño zoom en hover */
}

.g-recaptcha {
    margin-top: 20px;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

.form-actions button {
    transition: transform 0.3s ease, box-shadow 0.3s ease; /* Transición en botones */
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .form-actions {
        flex-direction: column;
        gap: 10px;
    }

    button {
        width: 100%;
    }
}

/* Modo Oscuro */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #1a73e8;
        --background-color: #121212;
        --text-color: #e0e0e0;
        --card-bg: #1e1e1e;
        --shadow-color: rgba(0, 0, 0, 0.5);
    }

    input, select, textarea {
        border: 2px solid var(--secondary-color);
        background-color: var(--background-color);
        color: var(--text-color);
    }

    button {
        background-color: var(--primary-color);
    }
}