/* ===== Formulario de registro de alumnos ===== */

.registration-container {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: calc(var(--header-height) + 40px) 20px 60px;
    background: linear-gradient(135deg, #f5f3ff 0%, #e9d5ff 50%, #c3cfe2 100%);
}

body.dark-mode .registration-container {
    background: linear-gradient(135deg, #030204 0%, #1a1126 55%, #0a0a0a 100%);
}

.registration-card {
    background: var(--white);
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
    max-width: 480px;
    width: 100%;
    overflow: hidden;
}

/* franja morada decorativa arriba de la tarjeta */
.registration-card::before {
    content: "";
    display: block;
    height: 6px;
    background: linear-gradient(120deg, #8e3ff0, #a855f7, #bd7af2);
}

body.dark-mode .registration-card {
    background: #111827;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.registration-form-box {
    padding: 48px;
}

.registration-form-box h2 {
    text-align: center;
    color: var(--text);
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.registration-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    background: var(--bg);
    color: var(--text);
    transition: var(--transition);
}

.form-control::placeholder {
    color: var(--text-light);
}

body.dark-mode .form-control {
    background: #1f2937;
    border-color: rgba(255, 255, 255, 0.1);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.15);
}

.field-error {
    color: #ef4444;
    font-size: 0.8rem;
    margin-top: 5px;
}

.registration-form-box .btn-principal {
    width: 100%;
    padding: 14px;
    margin-top: 12px;
    font-size: 1rem;
}

.registration-login-link {
    margin-top: 18px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

.registration-login-link a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

/* ===== Responsive ===== */
@media (max-width: 500px) {
    .registration-form-box {
        padding: 32px 24px;
    }
}